Phineas Gage
Phineas P. Gage (1823–1860) was an American railroad construction foreman remembered for his improbable[B1]: 19  survival of an accident in which a large iron rod was driven completely through his head, destroying much of his brain's left frontal lobe, and for that injury's reported effects on his personality and behavior over the remaining 12 years of his life‍—‌effects sufficiently profound that friends saw him (for a time at least) as "no longer Gage".

Long known as the "American Crowbar Case"‍—‌once termed "the case which more than all others is cal­cu­lated to excite our wonder, impair the value of prognosis, and even to subvert our phys­i­o­log­i­cal doctrines" ‍—‌Phineas Gage influenced 19th-century discussion about the mind and brain, par­tic­u­larly debate on cerebral local­i­za­tion,​​[M]: ch7-9 [B] and was perhaps the first case to suggest the brain's role in deter­min­ing per­son­al­ity, and that damage to specific parts of the brain might induce specific mental changes.
Gage is a fixture in the curricula of neurology, psychology, and neuroscience,​​[M7]: 149  one of "the great medical curiosities of all time"[M8] and "a living part of the medical folklore" [R]: 637  frequently mentioned in books and scientific papers;[M]: ch14  he even has a minor place in popular culture. Despite this celebrity, the body of established fact about Gage and what he was like (whether before or after his injury) is small, which has allowed "the fitting of almost any theory [desired] to the small number of facts we have" [M]: 290 ‍—‌Gage acting as a "Rorschach inkblot"  in which proponents of various conflicting theories of the brain all saw support for their views. Historically, published accounts of Gage (including scientific ones) have almost always severely exaggerated and distorted his behavioral changes, frequently contradicting the known facts.
A report of Gage's physical and mental condition shortly before his death implies that his most serious mental changes were temporary, so that in later life he was far more functional, and socially far better adapted, than in the years immediately following his accident. A social recovery hypothesis suggests that his work as a stagecoach driver in Chile fostered this recovery by providing daily structure that allowed him to regain lost social and personal skills.

Life
Background
Gage was the first of five children born to Jesse Eaton Gage and Hannah Trussell (Swetland) Gage of Grafton County, New Hampshire. Little is known about his upbringing and education beyond that he was literate.​​[M]: 17,41,90 [M10]: 643 Physician John Martyn Harlow, who knew Gage before his accident, described him as "a perfectly healthy, strong and active young man, twenty-five years of age, nervo-bilious temperament, five feet six inches [1.68 m] in height, average weight one hundred and fifty pounds [68 kg], possessing an iron will as well as an iron frame; muscular system unusually well developed‍—‌having had scarcely a day's illness from his childhood to the date of [his] injury".[H]: 4  (In the pseudoscience of phrenology, which was then just ending its vogue, nervo-bilious denoted an unusual combination of "excitable and active mental powers" with "energy and strength [of] mind and body [making] possible the endurance of great mental and physical labor".)​​[M]: 346-7 : 6 Gage may have first worked with explosives on farms as a youth, or in nearby mines and quarries.[M]: 17-8  In July 1848 he was employed on construction of the Hudson River Railroad near Cortlandt Town, New York,[M10]: 643  and by September he was a blasting foreman (possibly an independent contractor) on railway construction projects.[M]: 18-22,32n9  His employers' "most efficient and capable foreman ... a shrewd, smart business man, very energetic and persistent in executing all his plans of operation",[H]: 13-4  he had even commissioned a custom-made tamping iron‍—‌a large iron rod‍—‌for use in setting explosive charges.​​[B1]: 5 [M]: 25

Accident
On September 13, 1848, Gage was direct­ing a work gang blast­ing rock while pre­par­ing the road­bed for the Rut­land & Bur­ling­ton Rail­road south of the village of Cav­en­dish, Ver­mont. Setting a blast entailed boring a hole deep into an out­crop of rock; adding blast­ing pow­der and a fuse; then using the tamping iron to pack ("tamp") sand, clay, or other inert material into the hole above the powder in order to contain the blast's energy and direct it into surrounding rock.
As Gage was doing this around 4:30 p.m., his attention was attracted by his men working behind him.
Looking over his right shoulder, and inad­vert­ent­ly bringing his head into line with the blast hole and tamping iron, Gage opened his mouth to speak; in that same instant the tamping iron sparked against the rock and (possibly because the sand had been omitted) the powder exploded. Rocketed from the hole, the tamping iron‍—‌1+1⁄4 inches (3.2 cm) in diameter, three feet seven inches (1.1 m) long, and weighing 13+1⁄4 pounds (6.0 kg)‍—‌entered the left side of Gage's face in an upward direction, just forward of the angle of the lower jaw. Continuing upward outside the upper jaw and possibly fracturing the cheekbone, it passed behind the left eye, through the left side of the brain, then completely out the top of the skull through the frontal bone.​​[B1]: 13-4 [H]: 5 ​​[M]: 25-9 ​​​​Despite 19th-century references to Gage as the "American Crowbar Case", his tamping iron did not have the bend or claw some­times asso­ci­at­ed with the term crowbar; rather, it was simply a pointed cylinder something like a javelin,[K] round and fairly smooth:[H]: 5 
The end which entered [Gage's cheek] first is pointed; the taper being [eleven inches (28 cm) long, ending in a 1⁄4-inch (6 mm) point] [V]: 17 ... cir­cum­stances to which the patient perhaps owes his life. The iron is unlike any other, and was made by a neigh­bour­ing blacksmith to please the fancy of the owner.[B1]: 14 
The tamping iron landed point-first some 80 feet (25 m) away,[M]: 29  "smeared with blood and brain".[H]: 5 Gage was thrown onto his back and gave some brief convulsions of the arms and legs, but spoke within a few minutes, walked with little assistance, and sat upright in an oxcart for the 3⁄4-mile (1.2 km) ride to his lodgings in town.[H]: 5 
(A possibly apocryphal contemporary newspaper report claimed that Gage, while en route, made an entry in his time-book – the record of his crew's hours and wages.)[L1]: 172 
About 30 minutes after the accident, physician Edward H. Williams found Gage sitting in a chair outside the hotel and was greeted with "one of the great understatements of medical history":​​[M5]: 244 
When I drove up he said, "Doctor, here is business enough for you." I first noticed the wound upon the head before I alighted from my carriage, the pulsations of the brain being very distinct. The top of the head appeared somewhat like an inverted funnel, as if some wedge-shaped body had passed from below upward. Mr. Gage, during the time I was examining this wound, was relating the manner in which he was injured to the bystanders. I did not believe Mr. Gage's statement at that time, but thought he was deceived. Mr. Gage persisted in saying that the bar went through his head. Mr. G. got up and vomited; the effort of vomiting pressed out about half a teacupful of the brain [through the exit hole at the top of the skull], which fell upon the floor.
Harlow took charge of the case around 6 p.m.:

You will excuse me for remarking here, that the picture presented was, to one unaccustomed to military surgery, truly terrific; but the patient bore his sufferings with the most heroic firmness. He recognized me at once, and said he hoped he was not much hurt. He seemed to be perfectly conscious, but was getting exhausted from the hemorrhage. His person, and the bed on which he was laid, were literally one gore of blood.
Gage was also swallowing blood, which he regurgitated every 15 or 20 minutes.

Treatment and convalescence
With Williams' assistance Harlow shaved the scalp around the region of the tamping iron's exit, then removed coagulated blood, small bone fragments, and "an ounce or more" of protruding brain. After probing for foreign bodies and replacing two large detached pieces of bone, Harlow closed the wound with adhesive straps, leaving it partially open for drainage;[M]: 60-1  the entrance wound in the cheek was bandaged only loosely, for the same reason. A wet compress was applied, then a nightcap, then further bandaging to secure these dressings. Harlow also dressed Gage's hands and forearms (which along with his face had been deeply burned) and ordered that Gage's head be kept elevated.
Late that evening Harlow noted: "Mind clear. Constant agitation of his legs, being alternately retracted and extended ... Says he 'does not care to see his friends, as he shall be at work in a few days.'" 
Despite his own optimism, Gage's convalescence was long, difficult, and uneven. Though recognizing his mother and uncle—summoned from Lebanon, New Hampshire, 30 miles (50 km) away‍—‌[H]: 12 [M]: 30  on the morning after the accident, on the second day, he "lost control of his mind, and became decidedly delirious". By the fourth day, he was again "rational ... knows his friends", and after a week's further improvement Harlow entertained, for the first time, the thought "that it was possible for Gage to recover ... This improvement, however, was of short duration." 
Beginning 12 days after the accident,[M]: 53  Gage was semi-comatose, "seldom speaking unless spoken to, and then answering only in monosyllables", and on the 13th day Harlow noted, "Failing strength ... coma deepened; the globe of the left eye became more protuberant, with ["fungus"‍—‌deteriorated, infected tissue][M]: 61,283  pushing out rapidly from the internal canthus [as well as] from the wounded brain, and coming out at the top of the head." By the 14th day, "The exhalations from the mouth and head [are] horribly fetid. Comatose, but will answer in monosyllables if aroused. Will not take nourishment unless strongly urged. The friends and attendants are in hourly expectancy of his death, and have his coffin and clothes in readiness." Galvanized to action, Harlow "cut off the fungi which were sprouting out from the top of the brain and filling the opening, and made free application of caustic [i.e. crystalline silver nitrate][M]: 54 [H1]: 392  to them. With a scalpel I laid open the [frontalis muscle, from the exit wound down to the top of the nose][H1]: 392  and immediately there were discharged eight ounces [250 ml] of ill-conditioned pus, with blood, and excessively fetid."  ("Gage was lucky to encounter Dr. Harlow when he did", writes Barker. "Few doctors in 1848 would have had the experience with cerebral abscess with which Harlow left [Jefferson Medical College] and which probably saved Gage's life." [B]: 679-80  See § Factors favoring Gage's survival, below.)
On the 24th day, Gage "succeeded in raising himself up, and took one step to his chair". One month later, he was walking "up and down stairs, and about the house, into the piazza", and while Harlow was absent for a week Gage was "in the street every day except Sunday", his desire to return to his family in New Hampshire being "uncontrollable by his friends ... he went without an overcoat and with thin boots; got wet feet and a chill".  He soon developed a fever, but by mid-November was "feeling better in every respect [and] walking about the house again". Harlow's prognosis at this point: Gage "appears to be in a way of recovering, if he can be controlled".By November 25 (10 weeks after his injury), Gage was strong enough to return to his parents' home in Lebanon, New Hampshire, traveling there in a "close carriage" (an enclosed conveyance of the kind used for transporting the insane).[H]: 12 [M]: 92  Though "quite feeble and thin ... weak and childish"[M]: 93  on arriving, by late December he was "riding out, improving both mentally and physically",[H2] and by February 1849 he was "able to do a little work about the horses and barn, feeding the cattle etc. [and] as the time for ploughing came [i.e. about May or June] he was able to do half a day's work after that and bore it well". In August his mother told an inquiring physician that his memory seemed somewhat impaired, though slightly enough that a stranger would not notice.

Injuries
In April 1849, Gage returned to Cavendish and visited Harlow, who noted at that time loss of vision, and ptosis, of the left eye, a large scar on the forehead (from Harlow's draining of the abscess)[H1]: 392  and

upon the top of the head ... a quadrangular fragment of bone ... raised and quite prominent. Behind this is a deep depression, two inches by one and one-half inches [5 by 4 cm] wide, beneath which the pulsations of the brain can be perceived. Partial paralysis of the left side of the face. His physical health is good, and I am inclined to say he has recovered. Has no pain in head, but says it has a queer feeling which he is not able to describe.[H]: 12-3 
Gage's rearmost left upper molar, adjacent to the point of entry through the cheek, was also lost.
Though a year later some weakness remained,[M]: 93  Harlow wrote that "physically, the recovery was quite complete during the four years immediately succeeding the injury".[H]: 19

New England and New York (1849–1852)
In November 1849, Henry Jacob Bigelow, the Professor of Surgery at Harvard Medical School,[M1]: 828  brought Gage to Boston for several weeks and, after satisfying himself that the tamping iron had actually passed through Gage's head, presented him to a meeting of the Boston Society for Medical Improvement and (possibly) to the medical school class.​​[B1]: 20 ​​[M]: 43,95 ​​​​Unable to reclaim his railroad job (see § Early observations (1849–1852)) Gage was for a time "a kind of living museum exhibit"  at Barnum's American Museum in New York City. (This was not the later Barnum's circus; there is no evidence Gage ever exhibited with a troupe or circus, or on a fairground.) Advertisements have also been found for public appearances by Gage‍—‌which he may have arranged and promoted himself‍—‌in New Hampshire and Vermont,[M10]: 643-4  supporting Harlow's statement that Gage made public appearances in "most of the larger New England towns".[H]: 14 [M1]: 829  (Years later Bigelow wrote that Gage had been "a shrewd and intelligent man and quite disposed to do anything of that sort to turn an honest penny", but gave up such efforts because "[that] sort of thing has not much interest for the general public".)​​[B2]​​: 28 ​​[M10]: 643-4 
For about 18 months, he worked for the owner of a stable and coach service in Hanover, New Hampshire.​​[H]: 14 [M]: 101

Chile and California (1852–1860)
In August 1852, Gage was invited to Chile to work as a long-distance stagecoach driver there, "caring for horses, and often driving a coach heavily laden and drawn by six horses" on the Valparaíso–Santiago route.[M]: 103-4 [H]: 14  After his health began to fail in mid-1859,​​[H]: 14-5  he left Chile for San Francisco, arriving (in his mother's words) "in a feeble condition, having failed very much since he left New Hampshire ... Had many ill turns while in Valparaiso, especially during the last year, and suffered much from hardship and exposure." In San Francisco he recovered under the care of his mother and sister,[H]: 15  who had relocated there from New Hampshire around the time he went to Chile.[M]: 103-4  Then, "anxious to work", he found employment with a farmer in Santa Clara.[H]: 15 In February 1860, Gage began to have epileptic seizures. He lost his job, and (wrote Harlow) as the seizures increased in frequency and severity he "continued to work in various places [though he] could not do much".​​[M]: 14 [H]: 16

Death and exhumation
On May 18, 1860, Gage "left Santa Clara and went home to his mother. At 5 o'clock, A.M., on the 20th, he had a severe con­vul­sion. The family physician was called in, and bled him. The con­vul­sions were repeated frequently during the suc­ceed­ing day and night," [H]: 15  and he died in status epi­lep­ti­cus,[M2]: E  in or near San Francisco,
late on May 21, 1860. He was buried in San Francisco's Lone Mountain Cemetery.​​
In 1866, Harlow (who had "lost all trace of [Gage], and had well nigh abandoned all ex­pec­ta­tion of ever hearing from him again") somehow learned that Gage had died in California, and made contact with his family there. At Harlow's request the family had Gage's skull exhumed, then personally delivered it to Harlow,​​[M]: 108-11 [H]: 15-6 [M10]: 646  who was by then a prominent physician, busi­ness­man, and civic leader in Woburn, Massachusetts.​​[M]: 351-64 [M7]About a year after the accident, Gage had given his tamping iron to Harvard Medical School's Warren Anatomical Museum, but he later reclaimed it​​[B1]: 22n [M]: 46-7  and made what he called "my iron bar" [M10]: 644 [G1] his "constant companion during the remainder of his life";
now it too was delivered by Gage's family to Harlow.[M10]: 646  (Though some accounts assert that Gage's iron had been buried with him, there is no evidence for this.)​​[M10]: 647 [L1]: 177  After studying them for a triumphal[L1]: 178  1868 retrospective paper on Gage[H]: 3  Harlow redeposited the iron‍—‌this time with the skull‍—‌in the Warren Museum, where they remain on display today.The tamping iron bears the following inscription, commissioned by Bigelow in conjunction with the iron's original deposit in the Museum (though the date given for the accident is one day off):

This is the bar that was shot through the head of Mr Phinehas[sic] P. Gage at Cavendish Vermont Sept 14,[sic] 1848. He fully recovered from the injury & deposited this bar in the Museum of the Medical College of Harvard University.  •   Phinehas P. Gage  •   Lebanon Grafton Cy N–H  •   Jan 6 1850
The date Jan 6 1850 falls within the period during which Gage was in Boston under Bigelow's observation.​​[B1]: 20 [H]: 4n [M]: 43 In 1940 Gage's headless remains were moved to Cypress Lawn Memorial Park as part of a mandated relocation of San Francisco's cemeteries to outside city limits (see San Francisco cemetery relocations).​​[M]: 119-20

Mental changes and brain damage
Gage may have been the first case to suggest the brain's role in determining personality and that damage to specific parts of the brain might induce specific personality changes, but the nature, extent, and duration of these changes have been difficult to establish.[M]: 89 [M10]: 652-5  Only a handful of sources give direct information on what Gage was like (either before or after the accident), the mental changes published after his death were much more dramatic than anything reported while he was alive,[M]: 375-6  and few sources are explicit about the periods of Gage's life to which their various descriptions of him (which vary widely in their implied level of functional impairment) are meant to apply.​​[M10]: 646-7

Early observations (1849–1852)
Harlow ("virtually our only source of information" on Gage, according to psychologist Malcolm Macmillan)[M]: 333  described the pre-accident Gage as hard-working, responsible, and "a great favorite" with the men in his charge, his employers having regarded him as "the most efficient and capable foreman in their employ"; he also took pains to note that Gage's memory and general intelligence seemed unimpaired after the accident, outside of the delirium exhibited in the first few days.[M]: 30,91  Nonetheless these same employers, after Gage's accident, "considered the change in his mind so marked that they could not give him his place again":

The equilibrium or balance, so to  speak, between his intellectual faculties and animal pro­pen­si­ties, seems to have been destroyed. He is fitful, irreverent, indulging at times in the grossest profanity (which was not pre­vi­ous­ly his custom), manifesting but little deference for his fellows, impatient of restraint or advice when it conflicts with his desires, at times per­ti­na­cious­ly obstinate, yet capricious and vac­il­lat­ing, devising many plans of future operations, which are no sooner arranged than they are abandoned in turn for others appearing more feasible. A child in his intel­lec­tu­al capacity and man­i­fes­ta­tions, he has the animal passions of a strong man. Previous to his injury, although untrained in the schools, he possessed a well-balanced mind, and was looked upon by those who knew him as a shrewd, smart business man, very energetic and persistent in executing all his plans of operation. In this regard his mind was radically changed, so decidedly that his friends and acquaint­ances said he was "no longer Gage."[H]: 13-4 
This description ("now routinely quoted", says Kotowicz)[K2]: 125  is from Harlow's observations set down soon after the accident,​​[M]: 90,375 [M10]: 646-9  but Harlow‍—‌perhaps hesitant to describe his patient negatively while he was still alive[M]: 375-6 ‍—‌delayed publishing it until 1868, after Gage had died and his family had supplied "what we so much desired to see" (as Harlow termed Gage's skull).[H]: 16 In the interim, Harlow's 1848 report, published just as Gage was emerging from his convalescence, merely hinted at psychological symptoms:[M]: 169 
The mental manifestations of the patient, I reserve to a future communication. I think the case ... is exceedingly interesting to the enlightened physiologist and intellectual philosopher.[H1]: 393 
But after Bigelow termed Gage "quite recovered in faculties of body and mind" with only "inconsiderable disturbance of function",[B1]: 13-4  a rejoinder in the American Phrenological Journal‍—‌

That there was no difference in his mental manifestations after the recovery [is] not true ... he was gross, profane, coarse, and vulgar, to such a degree that his society was intolerable to decent people.
‍—‌was apparently based on information anonymously supplied by Harlow.[M]: 350-1  Pointing out that Bigelow gave extensive verbatim quotations from Harlow's 1848 papers, yet omitted Harlow's promise to follow up with details of Gage's "mental manifestations", Barker explains Bigelow's and Harlow's contradictory evaluations (less than a year apart) by differences in their educational backgrounds, in particular their attitudes toward cerebral localization (the idea that different regions of the brain are specialized for different functions) and phrenology (the nineteenth-century pseudoscience that held that talents and personality can be inferred from the shape of a person's skull):

Harlow's interest in phrenology prepared him to accept the change in [Gage's] character as a significant clue to cerebral function which merited publication. Bigelow had [been taught] that damage to the cerebral hemispheres had no intellectual effect, and he was unwilling to consider Gage's deficit significant ... The use of a single case [including Gage's] to prove opposing views on phrenology was not uncommon.[B]: 672,676,678,680  
A reluctance to ascribe a biological basis to "higher mental functions" (functions‍—‌such as language, personality, and moral judgment‍—‌beyond the merely sensory and motor) may have been a further reason Bigelow discounted the behavioral changes in Gage which Harlow had noted.​​[M]: 169-70 [M1]: 838  (See Mind–body dualism.)

Later observations (1858–1859)
In 1860, an American physician who had known Gage in Chile in 1858 and 1859 described him as still "engaged in stage driving [and] in the enjoyment of good health, with no impairment whatever of his mental faculties".​​[M10]: 648  Together with the fact that Gage was hired by his employer in advance, in New England, to become part of the new coaching enterprise in Chile,​​[H]: 15 [M10]: 655  this implies that Gage's most serious mental changes had been temporary, so that the "fitful, irreverent ... capricious and vacillating" Gage described by Harlow immediately after the accident became, over time, far more functional and far better adapted socially.​​[M1]: 831 [M10]: 642,655 Macmillan writes that this conclusion is reinforced by the responsibilities and challenges associated with stagecoach work such as that done by Gage in Chile, including the requirement that drivers "be reliable, resourceful, and possess great endurance. But above all, they had to have the kind of personality that enabled them to get on well with their passengers." ​​: 127-32 [M]: 104-6 [M10]: 644-5  A day's work for Gage meant "a 13-hour journey over 100 miles [160 km] of poor roads, often in times of political instability or frank revolution. All this‍—‌in a land to whose language and customs Phineas arrived an utter stranger‍—‌militates as much against permanent disinhibition [i.e. an inability to plan and self-regulate] as do the extremely complex sensory-motor and cognitive skills required of a coach driver." ​​[M10]: 645 [M1]: 831  (An American visitor wrote: "The departure of the coach was always a great event at Valparaiso‍—‌a crowd of ever-astonished Chilenos assembling every day to witness the phenomenon of one man driving six horses."): 73

Social recovery
Macmillan writes that this contrast‍—‌between Gage's early, versus later, post-accident behavior‍—‌reflects his "[gradual change] from the commonly portrayed impulsive and uninhibited person into one who made a reasonable 'social recovery'", citing persons with similar injuries for whom "someone or something gave enough structure to their lives for them to relearn lost social and personal skills":[M1]: 831 
Phineas' survival and rehabilitation demonstrated a theory of recovery which has influ­enced the treat­ment of frontal lobe damage today. In modern treat­ment, adding struc­ture to tasks by, for example, mentally vis­u­al­is­ing a written list, is con­sid­ered a key method in coping with frontal lobe damage.[M4]
According to contemporary accounts by visitors to Chile,​​[M1]: 831 [M10]: 645  Gage would have had to

rise early in the morning, prepare himself, and groom, feed, and harness the horses; he had to be at the departure point at a specified time, load the luggage, charge the fares and get the passengers settled; and then had to care for the passengers on the journey, unload their luggage at the destination, and look after the horses. The tasks formed a structure that required control of any impulsiveness he may have had.[M9]
En route (Macmillan continues):

much foresight was required. Drivers had to plan for turns well in advance, and sometimes react quickly to manoeuvre around other coaches, wagons, and birlochos travelling at various speeds ... Adaptation had also to be made to the physical condition of the route: although some sections were well-made, others were dangerously steep and very rough.
Thus Gage's stagecoach work‍—‌"a highly structured environment in which clear sequences of tasks were required [but within which] contingencies requiring foresight and planning arose daily"‍—‌resembles rehabilitation regimens first developed by Soviet neuropsychologist Alexander Luria for the reestablishment of self-regulation in World War II soldiers suffering frontal lobe injuries.​​[M10]: 645,651-2,655 [L2]A neurological basis for such recoveries may be found in emerging evidence "that damaged [neural] tracts may re-establish their original connections or build alternative pathways as the brain recovers" from injury. Macmillan adds that if Gage made such a recovery‍—‌if he eventually "figured out how to live" (as Fleischman put it)[F]: 75  despite his injury‍—‌then it "would add to current evidence that rehabilitation can be effective even in difficult and long-standing cases";[M1]: 831  and if Gage could achieve such improvement without medical supervision, "what are the limits for those in formal rehabilitation programs?" [M9] As author Sam Kean put it, "If even Phineas Gage bounced back‍—‌that's a powerful message of hope." [K]

Exaggeration and distortion of mental changes
Macmillan's analysis of scientific and popular accounts of Gage found that they almost always distort and exaggerate his behavioral changes well beyond anything described by anyone who had direct contact with him, concluding that the known facts are "inconsistent with the common view of Gage as a boastful, brawling, foul-mouthed, dishonest useless drifter, unable to hold down a job, who died penniless in an institution".  In the words of Barker, "As years passed, the case took on a life of its own, accruing novel additions to Gage's story without any factual basis".[B]: 678  Even today (writes Zbigniew Kotowicz) "Most commentators still rely on hearsay and accept what others have said about Gage, namely, that after the accident he became a psychopath";[K2]: 125  Grafman has written that "the details of [Gage's] social cognitive impairment have occasionally been inferred or even embellished to suit the enthusiasm of the story teller";[G]: 295 
and Goldenberg calls Gage "a (nearly) blank sheet upon which authors can write stories which illustrate their theories and entertain the public". For example, Harlow's statement that Gage "continued to work in various places; could not do much, changing often, and always finding something that did not suit him in every place he tried" [H]: 15  refers only to Gage's final months, after convulsions had set in.[M]: 107 [M10]: 646  But it has been misinterpreted as meaning that Gage never held a regular job after his accident, "was prone to quit in a capricious fit or be let go because of poor discipline",: 8-9  "never returned to a fully independent existence",: 1102  "spent the rest of his life living miserably off the charity of others and traveling around the country as a sideshow freak", and ("dependent on his family"  or "in the custody of his parents") died "in careless dissipation". In fact, after his initial post-recovery months spent traveling and exhibiting, Gage supported himself‍—‌at a total of just two different jobs‍—‌from early 1851 until just before his death in 1860.​​[M10]: 654-5 [D]: 77 Other behaviors ascribed, by various authors, to the post-accident Gage that are either unsupported by, or in contradiction to, the known facts include the following:

None of these behaviors are mentioned by anyone who had met Gage or even his family,
and as Kotowicz put it, "Harlow does not report a single act that Gage should have been ashamed of." [K2]: 122-3  Gage is "a great story for illustrating the need to go back to original sources", writes Macmillan, most authors having been "content to summarize or paraphrase accounts that are already seriously in error". [M]: 315 Nonetheless (write Daffner and Searl) "the telling of [Gage's] story has increased interest in understanding the enigmatic role that the frontal lobes play in behavior and personality", and Ratiu has said that in teaching about the frontal lobes, an anecdote about Gage is like an "ace [up] your sleeve. It's just like whenever you talk about the French Revolution you talk about the guillotine, because it's so cool." [K]
Benderly suggests that instructors use the Gage case to illustrate the importance of critical thinking.

Extent of brain damage
Debate about whether the trauma and sub­se­quent infection had damaged Gage's left and right frontal lobes, or only the left, began almost immedi­ate­ly after his accident.​​ The 1994 con­clu­sion of Hanna Damasio et al., that the tamping iron did physical damage to both lobes, was drawn not from Gage's skull but from a cadaver skull dig­i­tal­ly deformed to match the dimen­sions of Gage's​​[M1]: 829-30 ​​: 1103-4 ‍—‌and made a priori assumptions about the location of Gage's internal injuries and the exit wound which in some cases contradict Harlow's observations.[M]: 77-82  Using CT scans of Gage's actual skull, Ratiu et al.[R]: 638  and Van Horn et al.[V]: 4-5,22  both rejected that conclusion, agreeing with Harlow's belief‍—‌based on probing Gage's wounds with his fingers‍—‌that only the left frontal lobe had been damaged.​​
In addition, Ratiu et al. noted that the hole in the base of the cranium (created as the tamping iron passed through the sphenoidal sinus into the brain) has a diameter about half that of the iron itself; combining this with the hairline fracture beginning behind the exit region and running down the front of the skull, they concluded that the skull "hinged" open as the iron entered from below, then was pulled closed by the resilience of soft tissues once the iron had exited through the top of the head.​​[R]: 640 [M1]: 830 Van Horn et al. concluded that damage to Gage's white matter (of which they made detailed estimates) was as or more significant to Gage's mental changes than cerebral cortex (gray matter) damage.[V]: abstr  Thiebaut de Schotten et al. estimated white-matter damage in Gage and two other case studies ("Tan" and "H.M."), concluding that these patients "suggest that social behavior, language, and memory depend on the coordinated activity of different [brain] regions rather than single areas in the frontal or temporal lobes."[T1]: 12

Factors favoring Gage's survival
Harlow saw Gage's survival as demonstrating "the wonderful resources of the system in enduring the shock and in overcoming the effects of so frightful a lesion, and as a beautiful display of the recuperative powers of nature", and listed what he saw as the circumstances favoring it:

1st. The subject was the man for the case. His physique, will, and capacity of endurance, could scarcely be excelled.[H]: 18 

For Harlow's description of the pre-accident Gage, see § Background, above.

2d. The shape of the missile‍—‌being pointed, round and comparatively smooth, not leaving behind it prolonged concussion or compression.[H]: 18 

Despite its very large diameter and mass (compared to a weapon-fired projectile) the tamping iron's relatively low velocity drastically reduced the energy available to compressive and concussive "shock waves".​​[M]: 56,68n3 ​​Harlow continued:

3d. The point of entrance ... [The tamping iron] did little injury until it reached the floor of the cranium, when, at the same time that it did irreparable damage, it [created the] opening in the base of the skull, for drainage, [without which] recovery would have been impossible.

Barker writes that "[Head injuries] from falls, horse kicks, and gunfire, were well known in pre–Civil War America [and] every contemporary course of lectures on surgery described the diagnosis and treatment" of such injuries. But to Gage's benefit, surgeon Joseph Pancoast had performed "his most celebrated operation for head injury before Harlow's medical class, [trepanning] to drain the pus, resulting in temporary recovery. Unfortunately, symptoms recurred and the patient died. At autopsy, reaccumulated pus was found: granulation tissue had blocked the opening in the dura." By keeping the exit wound open, and elevating Gage's head to encourage drainage from the cranium into the sinuses (through the hole made by the tamping iron), Harlow "had not repeated Professor Pancoast's mistake".​​[B]: 675 [M]: 58 

Finally,

4th. The portion of the brain traversed was, for several reasons, the best fitted of any part of the cerebral substance to sustain the injury.[H]: 18 

Precisely what Harlow's "several reasons" were is unclear, but he was likely referring, at least in part, to the understanding (slowly developing since ancient times) that injuries to the front of the brain are less dangerous than are those to the rear, because the latter frequently interrupt vital functions such as breathing and circulation.[M]: 126,142  For example, surgeon James Earle wrote in 1790 that "a great part of the cerebrum may be taken away without destroying the animal, or even depriving it of its faculties, whereas the cerebellum will scarcely admit the smallest injury, without being followed by mortal symptoms." ​​[M]: 128 
Ratiu et al. and Van Horn et al. both concluded that the tamping iron passed left of the superior sagittal sinus and left it intact, both because Harlow does not mention loss of cerebrospinal fluid through the nose, and because otherwise Gage would almost certainly have suffered fatal blood loss or air embolism.​​[R]: 640 [V]: 17 
Harlow's moderate (in the context of medical practice of the time) use of emetics, purgatives, and (in one instance) bleeding[M]: 59-60  would have "produced dehydration with reduction of intracranial pressure [which] may have favorably influenced the outcome of the case", according to Steegmann.: 956 As to his own role in Gage's survival, Harlow merely averred, "I can only say ... with good old Ambroise Paré, I dressed him, God healed him",[H]: 20  but Macmillan calls this self-assessment far too modest. Noting that Harlow had been a "relatively inexperienced local physician ... graduated four and a half years earlier",[M]: 12  Macmillan's discussion of Harlow's "skillful and imaginative adaptation [of] conservative and progressive elements from the available therapies to the particular needs posed by Gage's injuries" emphasizes that Harlow "did not apply rigidly what he had learned", for example forgoing an exhaustive search for bone fragments (which risked hemorrhage and further brain injury) and applying caustic to the "fungi" instead of excising them (which risked hemorrhage) or forcing them into the wound (which risked compressing the brain).[M]: 58-62

Early medical attitudes
Skepticism
Barker notes that Harlow's original 1848 report of Gage's sur­viv­al and recov­ery "was widely dis­be­lieved, for obvious reasons" [B]: 676  and Harlow, recall­ing this early skep­ti­cism in his 1868 ret­ro­spec­tive, invoked the Biblical story of Doubting Thomas:[L1]: 178 
The case occurred nearly twenty years ago, in an obscure country town ..., was attended and reported by an obscure country phy­si­cian, and was received by the Met­ro­pol­i­tan Doctors with several grains of caution, insomuch that many utterly refused to believe that the man had risen, until they had thrust their fingers into the hole [in] his head, and even then they required of the Country Doctor attested state­ments, from clergy­men and lawyers, before they could or would believe‍—‌many eminent surgeons regarding such an occur­rence as a phys­i­o­log­i­cal impos­si­bil­i­ty, the appear­ances pre­sented by the subject being var­i­ous­ly explained away.

"A distinguished Professor of Surgery in a distant city", Harlow continued, had even dismissed Gage as a "Yankee invention".[H]: 3,18 According to the Boston Medical and Surgical Journal (1869) it was the 1850 report on Gage by Bigelow‍—‌Harvard's Professor of Surgery and "a majestic and author­i­ta­tive figure on the medical scene of those times" ‍—‌that "finally succeeded in forcing [the case's] authenticity upon the credence of the pro­fes­sion ... as could hardly have been done by any one in whose sagacity and surgical knowledge his confrères had any less confidence". Noting that, "The leading feature of this case is its improb­a­bil­i­ty ... This is the sort of accident that happens in the pantomime at the theater, not elsewhere", Bigelow emphasized that though "at first wholly skeptical, I have been personally convinced".Nonetheless (Bigelow wrote just before Harlow's 1868 presentation of Gage's skull) though "the nature of [Gage's] injury and its reality are now beyond doubt ... I have received a letter within a month [purporting] to prove that ... the accident could not have happened." [B2]

Standard for other brain injuries
As the reality of Gage's accident and survival gained credence, it became "the standard against which other injuries to the brain were judged", and it has retained that status despite competition from a growing list of other unlikely-sounding brain-injury accidents, including encounters with axes, bolts, low bridges, exploding firearms, a revolver shot to the nose, further tamping irons, and falling Eucalyptus branches.[M]: 62-7 
For example, after a miner survived traversal of his skull by a gas pipe 5⁄8 inch (1.6 cm) in diameter (extracted "not without considerable difficulty and force, owing to a bend in the portion of the rod in his skull"), his physician invoked Gage as the "only case comparable with this, in the amount of brain injury, that I have seen reported".Often these comparisons carried hints of humor, competitiveness, or both.[M]: 66  The Boston Medical and Surgical Journal, for example, alluded to Gage's astonishing survival by referring to him as "the patient whose cerebral organism had been comparatively so little disturbed by its abrupt and intrusive visitor"; and a Kentucky doctor, reporting a patient's survival of a gunshot through the nose, bragged, "If you Yankees can send a tamping bar through a fellow's brain and not kill him, I guess there are not many can shoot a bullet between a man's mouth and his brains, stopping just short of the medulla oblongata, and not touch either."
Similarly, when a lumbermill foreman returned to work soon after a saw cut three inches (8 cm) into his skull from just between the eyes to behind the top of his head, his surgeon (who had removed from this wound "thirty-two pieces of bone, together with considerable sawdust") termed the case "second to none reported, save the famous tamping-iron case of Dr. Harlow", though apologizing that "I cannot well gratify the desire of my professional brethren to possess [the patient's] skull, until he has no further use for it himself."As these and other remarkable brain-injury survivals accumulated, the Boston Medical and Surgical Journal pretended to wonder whether the brain has any function at all: "Since the antics of iron bars, gas pipes, and the like skepticism is discomfitted, and dares not utter itself. Brains do not seem to be of much account now-a-days." The Transactions of the Vermont Medical Society was similarly facetious: "'The times have been,' says Macbeth [Act III], 'that when the brains were out the man would die. But now they rise again.' Quite possibly we shall soon hear that some German professor is exsecting it." ​​[L1]: 183 : 53-4

Theoretical misuse
Though Gage is considered the "index case for personality change due to frontal lobe damage", ​​[B]: 672 ​​​​[F1]​​[M]: 1  the uncertain extent of his brain damage​​[F1]: 1349 [M]: 11,ch5  and the limited understanding of his behavioral changes render him "of more historical than neurologic  [sic] interest".: 1348  Thus, Macmillan writes, "Phineas' story is [primarily] worth remembering because it illustrates how easily a small stock of facts becomes transformed into popular and scientific myth", the paucity of evidence having allowed "the fitting of almost any theory [desired] to the small number of facts we have".[M]: 290  A similar concern was expressed as early as 1877, when British neurologist David Ferrier (writing to Harvard's Henry Pickering Bowditch in an attempt "to have this case definitely settled") complained that, "In investigating reports on diseases and injuries of the brain, I am constantly being amazed at the inexactitude and distortion to which they are subject by men who have some pet theory to support. The facts suffer so frightfully ..." ​​[M]: 1,75,197-9,464-5 ​​
More recently, neurologist Oliver Sacks refers to the "interpretations and misinterpretations [of Gage] from 1848 to the present",
and Jarrett discusses the use of Gage to promote "the myth, found in hundreds of psychology and neuroscience textbooks, plays, films, poems, and YouTube skits[:] Personality is located in the frontal lobes ... and once those are damaged, a person is changed forever."

Cerebral localization
In the 19th-century debate over whether the various mental functions are or are not localized in specific regions of the brain (see Cerebral localization), both sides managed to enlist Gage in support of their theories.[B]: 678 [M]: ch9  For example, after Eugene Dupuy wrote that Gage proved that the brain is not localized (characterizing him as a "striking case of destruction of the so-called speech centre without consequent aphasia") Ferrier replied by using Gage (along with the woodcuts of his skull and tamping iron from Harlow's 1868 paper) to support his thesis that the brain is localized.​​[M]: 188 ​​[M5]: 198,253

Phrenology
Throughout the 19th century, adherents of phrenology contended that Gage's mental changes (his profanity, for example) stemmed from destruction of his mental "organ of Benevolence"‍—‌as phrenologists saw it, the part of the brain responsible for "goodness, benevolence, the gentle character ... [and] to dispose man to conduct himself in a manner conformed to the maintenance of social order"‍—‌and/or the adjacent "organ of Veneration"‍—‌related to religion and God, and respect for peers and those in authority.​​[M]: 150-1,171n10 ​​​​​​ (Phrenology held that the organs of the "grosser and more animal passions are near the base of the brain; literally the lowest and nearest the animal man [while] highest and farthest from the sensual are the moral and religions feelings, as if to be nearest heaven". Thus Veneration and Benevolence are at the apex of the skull‍—‌the region of exit of Gage's tamping iron.)Harlow wrote that Gage, during his convalescence, did not "estimate size or money accurately[,] would not take $1000 for a few pebbles"[H1]: 392  and was not particular about prices when visiting a local store;[H]: 337  by these examples Harlow may have been implying damage to phrenology's "Organ of Comparison".

Psychosurgery and lobotomy
It is frequently asserted that what happened to Gage played a role in the later development of various forms of psychosurgery‍—‌particularly lobotomy‍—‌or even that Gage's accident constituted "the first lobotomy". Aside from the question of why the unpleasant changes usually (if hyperbolically) attributed to Gage would inspire surgical imitation, there is no such link, according to Macmillan:

There is simply no evidence that any of these operations were deliberately designed to produce the kinds of changes in Gage that were caused by his accident, nor that knowledge of Gage's fate formed part of the rationale for them[M2]: F ‍... [W]hat his case did show came solely from his surviving his accident: major operations [such as for tumors] could be performed on the brain without the outcome necessarily being fatal.[M]: 250

Somatic marker hypothesis
Antonio Damasio, in support of his somatic marker hypothesis (relating decision-making to emotions and their biological underpinnings), draws parallels between behaviors he ascribes to Gage and those of modern patients with damage to the orbitofrontal cortex and amygdala.: ch3  But Damasio's depiction of Gage: ch1  has been severely criticized, for example by Kotowicz:

Damasio is the principal perpetrator of the myth of Gage the psycho­path ... Damasio changes [Harlow's] nar­ra­tive, omits facts, and adds freely ... His account of Gage's last months [is] a gro­tesque fab­ri­ca­tion [insin­u­at­ing] that Gage was some riff-raff who in his final days headed for Cal­i­for­nia to drink and brawl himself to death ... It seems that the growing com­mit­ment to the frontal lobe doctrine of emotions brought Gage to the lime­light and shapes how he is described.[K2]: 125,130n6  
As Kihlstrom put it, "[M]any modern commentators exaggerate the extent of Gage's personality change, perhaps engaging in a kind of retrospective reconstruction based on what we now know, or think we do, about the role of the frontal cortex in self-regulation."[K1]
Macmillan​​[M]: 116-9,326,331  gives detailed criticism of Antonio Damasio's various presentations of Gage (some of which are joint work with Hannah Damasio and others).

Portraits
Two daguerreotype portraits of Gage, identi­fied in 2009 and 2010, are the only like­nes­ses​​[W]: 343 [T][W1]: 8  of him known other than a plaster head cast taken for Bigelow in late 1849 (and now in the Warren Museum along with Gage's skull and tamping iron).
The first portrait shows a "disfigured yet still-handsome" Gage[T] with left eye closed and scars clearly visible, "well dressed and confident, even proud" [W]: 343  and holding his iron, on which portions of its inscription can be made out.[W2] (For decades the portrait's owners had believed that it depicted an injured whaler with his harpoon.)[W2]
The second portrait, copies of which are in the possession of two branches of the Gage family, shows Gage in a somewhat different pose wearing the same waistcoat and possibly the same jacket, but with a different shirt and tie.[W3][L]Authenticity of the portraits was confirmed by overlaying the inscription on the tamping iron, as seen in the portraits, against that on the actual tamping iron, and matching the subject's injuries to those preserved in the head cast.[W]: 342-3 [L] However, about when, where, and by whom the portraits were taken nothing is known, except that they were created no earlier than January 1850 (when the inscription was added to the tamping iron),[M10]: 644  on different occasions, and are likely by different photographers.[W1]: 8 The portraits support other evidence that Gage's most serious mental changes were temporary (see § Social recovery).[M9] "That [Gage] was any form of vagrant following his injury is belied by these remarkable images", wrote Van Horn et al.[V]: 13  "Although just one picture," Kean commented in reference to the first image discovered, "it exploded the common image of Gage as a dirty, disheveled misfit. This Phineas was proud, well-dressed, and disarmingly handsome." [K]

See also
Notes
References
For general readers

For younger readers

For researchers and specialists

Other sources cited

External links

Phineas Gage information page by the Center for the History of Psychology at the University of Akron
Case of Phineas Gage at the Center for the History of Medicine
Skull, life cast, and tamping iron of Phineas Gage at the Warren Anatomical Museum of the Harvard Medical School
Skull of Phineas Gage at the National Institutes of Health 3D print exchange