HSM 330 Study Guide - Medial Geniculate Nucleus, Auditory Cortex, Stria Terminalis

• School: Ryerson University
• Department: Health Services Management
• Course: HSM 330
• Professor: Daolun Chen

Document Summary

Papez: added anatomical circuits in forebrain to theory, but retained central ro le of ascending & descending connections from hypothalamus. Maclean: called forebrain emotional circuits the visceral brain, and later the l imbic system. Weiskrantz: proposed that amygdala lesions dissociate the affective/reinforcing properties of stimuli from their sensory representations. In pavlovian fear conditioning, an emotionally neutral conditioned stimulus (cs. The responses are not learned/voluntary, they are innate, species-typical respo nses to threats. Fear conditioning allows new/learned threats to automatically activate evolutio nary tuned ways of responding to danger. Sensory inputs to amygdala terminate mainly in lateral nucleus (la), damage to. Auditory inputs to la come from auditory thalamus and auditory cortex, and fear condit. to a simple auditory. Projection to la from auditory cortex is involved w/ a more complex auditory st imulus pattern. Single unit recordings show that the cortical pathway conditions slower over tr ials than the thalamic pathway.