HMB200H1 Study Guide - Final Guide: Anterograde Amnesia, Startle Response, Fear Conditioning
Document Summary
Learning: relatively permanent change in behaviour from experience. Memory: ability to recall / recognize previous experience. Engram (memory trace): mental representation of the previous experience. Reflexive response elicited by some other stimulus, through association. Most commonly triggered by strong auditory inputs, but also other strong. Triggered by amygdala: sensory thalamus amygdala startle response & 4 f"s. Amygdala: part of the limbic system responsible for triggering the 4 f"s. Fear (fight, flight, freeze), and sexual behaviours. Central nucleus outputs from the amygdala: triggers in the body to perform the 4f"s. Required for fear learning, but not for memory: can remember the things that happened, but startling/fearful things that should trigger fear response won"t, retained the explicit memory. Pairing of fear response with the neutral stimulus (often tone or context) Through associativity of ltp, the neutral synapse also strengthens onto the lateral nucleus of the amygdala: allows the non-emotional inputs to also activate downstream central amygdala output.
