Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Fassara: A cikin labarinsa na 1884 William James ya yi jayayya cewa ji da motsin rai na biyu ne ga abubuwan da ke faruwa a jiki. A cikin ka'idarsa, James ya ba da shawarar cewa fahimtar abin da ya kira "gaskiya mai ban sha'awa" kai tsaye ya haifar da amsawar ilimin lissafi, wanda aka sani da "jin dadi". Don yin lissafin nau'ikan kwarewar motsin rai, James ya ba da shawarar cewa abubuwan motsa jiki suna haifar da aiki a cikin tsarin juyayi mai zaman kansa, wanda hakan ke haifar da kwarewar motsin rai a cikin kwakwalwa. Masanin ilimin halayyar Danish Carl Lange shima ya gabatar da irin wannan ka'idar a kusan lokaci guda, sabili da haka wannan ka'idar ta zama sananne da ka'idar James <unk> Lange. Kamar yadda James ya rubuta, "hankalin canji na jiki, yayin da ya faru, shi ne motsin rai". James ya ci gaba da da'awar cewa "muna jin bakin ciki saboda muna kuka, fushi saboda mun buga, tsoro saboda muna rawar jiki, kuma ko dai muna kuka, buga, ko rawar jiki saboda muna baƙin ciki, fushi, ko tsoro, kamar yadda lamarin zai kasance".Misali na wannan ka'idar a aikace zai zama kamar haka: Wani motsawa mai motsa motsin rai (maciji) yana haifar da tsarin amsawar jiki (ƙara yawan bugun zuciya, saurin numfashi, da sauransu), wanda aka fassara shi azaman wani motsin rai (tsoro). Wannan ka'idar tana da goyan bayan gwaje-gwajen da ta hanyar sarrafa yanayin jiki yana haifar da yanayin motsin zuciyar da ake so. Wasu mutane suna iya gaskata cewa motsin rai yana haifar da ayyuka na musamman na motsin rai, alal misali, "Ina kuka domin ina baƙin ciki", ko kuma "Na gudu domin ina jin tsoro". Batun da ke tattare da ka'idar James-Lange shine na sanadin (yanayin jiki yana haifar da motsin rai da kasancewa a priori), ba na tasirin jiki akan kwarewar motsin rai ba (wanda za'a iya jayayya kuma har yanzu yana da yawa a yau a cikin nazarin nazarin biofeedback da ka'idar jiki). Kodayake galibi an watsar da shi a cikin asalinsa, Tim Dalgleish ya yi jayayya cewa yawancin masana kimiyyar kwakwalwa na zamani sun rungumi abubuwan da ke cikin ka'idar motsin zuciyar James-Lange.  Tambaya: Me ya sa ka'idar da James ya gabatar da farko tana da suna mai kashi biyu?
Masanin ilimin halayyar Danish Carl Lange shima ya gabatar da irin wannan ka'idar