[Name] Bendii Syndrome [Source] Star Trek: The Next Generation [Symptoms] 
A degenerative neurological illness that occasionally afflicts some elderly Vulcans. Symptoms include a gradual loss of emotional control and a telepathic influence on non-Vulcans to exhibit similar emotional volatility. Ambassador Sarek of Vulcan is diagnosed with this illness, so he preserves his memories through a mind-meld with Captain Picard. Sarek later dies from this illness while Picard is deep in Romulan space in search of his friend's son, Spock. Days after breaking the news to Spock of Sarek's passing, Spock and Picard meld so they can share Sarek's memories.