NRSC 335 Lecture 23: fear
11 May 2017
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Document Summary
Amygdala: amygdala damage, r esponsible for kluver-bucy syndrome. Lesions block recognition of fear in facial expressions. P atient s m -> urbach-wiethe disease (select calcification of the amygdala) C an recognize every facial expression but fear. Fearful facial expressions increase blood flow in amygdala. E lectrical stimulation of the amygdala evokes fear in rats and humans. P atients with amygdaloidal seizures often feel fear immediately before the seizure: amygdala lesions in humans eliminate both innate and learned fear. P avlovian fear conditioning: neutral conditional stimulus (c s ) predicts aversive unconditional stimulus (us , e . g. tone predicts footshock, after a few trials, tone will elicit a conditional fear response (freezing) Fear of an animal may be experimentally set up by stimulating the infant with a loud sound just at the moment the animal is presented. 6 combined stimulations produced the marked fear: amygdala lesions block fear conditioning in humans, visual c s (c olorful slide) with boat horn us.
