Emotion 5 Flashcards
Innate escape or avoidance response in flies
- Single shadow pass: freezing; mulitple shadow passes: hopping -> scalability
- Shadow disperse flies from food away from shadow -> Valence and Automaticity
- Behavioural response persisted for minutes -> Persistence
- Generalization to different context -> Generalization
Flies and appetitive and aversive conditioning
Key findings: association of the CS with positive or negative valence depends on:
- Sparse representation of the odour by the Kenyon MB cells
- Compartment specific synapses with MBONs that promote either approach or avoidance
- Strengthening of these Kenyon-MBON synapses by compartment specific DA release from specific DA neurons activated by shock or sucrose
Aggression and courtship in male flies
P1 neuronal cluster mediates both male flies’ aggression towards other males and mating towards females
Amygdala nuclei involved in fear conditioning
Basolateral complex, and central nucleus.
Amygdala function in fear
Necessary for acquisition and expression of conditioned fear but not sufficient for conscious experience of fear.
Fear acquisition and expression brain areas
Acquisition: CS and US pathways converge in the BLA where they strengthen synaptic response to the CS
Expression: this info is then relayed to the CeA as the final common pathway for output of the amygdala
BLA neurons rewarding and aversive stimuli
BLA neurons activated by aversive stimuli project to the CeA
BLA neurons activated by rewarding stimuli project to the NAc
Innate fear brain area
Ventromedial Hypothalamus
Bilateral lesion of amygdala (Urbach-Wiethe disease)
- Normal intelligence, memory, friendly, language
- Intact concept of fear
- No pavlovian fear conditioning of SCR
- Difficulty recognizing fearful expressions because they don’t spontaneously attend to eye regions
- Less conscious experience of fear, no fear when watching horror films or touching snake/spider
