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Lecture 4

PSY372H5 Lecture Notes - Lecture 4: Fear Conditioning, Prefrontal Cortex, Convergence Zone


Department
Psychology
Course Code
PSY372H5
Professor
Christina Gojmerac
Lecture
4

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PSY372 Lecture 4
- Emotional memory
- Part 1: implicit emotional memory
oHaving emotion for something without knowing where it came from
oFear conditioning:
oRole of amygdala in emotional memory
oApplies to different species
- Fear conditioning paradigm
oRat’s response to specific stimulus
oHow that response changes after a learning period
oA light is turned on in the animal chamber; no fearful response
oWhen rat receives foot shock (aversive stimulus), it will respond by jumping
oLoud noise (another unconditioned stimulus that is aversive in nature) will also
create the jumping response
- Fear conditioning paradigm
oWhen light is associated with foot shock, it will be trained to be startled with the
light
oWhen the light is shown alone, the rat will have a jumping response (conditioned
response); anticipatory fear
oWhen rat is paired with light and another aversive stimulus, it will show
potentiated startle (exaggerated response)
- Neural circuitry of fear learning
oAutonomic response
oDamage to amygdala will impair the conditioned fear response
- Brain image
oConvergence zone
oLots of input to amygdala from different places

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- #3
oReach amygdala through separate and simultaneous groups
oIncoming from environment will project to thalamus (relay centre) and then
information will go to amygdala; quick but crude analysis; subcortical “low road”
oInformation about sensory stimulus is also projected to amygdala; but first to
thalamus and then to sensory regions in order to thoroughly analyze the stimulus
and then it goes to the amygdala; complete information but takes longer (cortical,
“high road”)
- Amygdala damage
oWith amygdala damage, will fail to demonstrate indirect response
oBut when asked to report the parameters, they do know about the fear
conditions; dissociation
- Amygdala damage
oS.P patient
oRemoved parts of medial temporal lobe
- #3
oSkin conductance response; measuring the sweat on the hands
oDemonstrated normal fear response to shock; no change to response after it was
paired with the blue square
- #4
oWhen presented with shock alone, both S.P and normal person has elevated
peak; control subject shows increase in peak when shown conditioned stimulus,
but S.P did not and she was surprised
- #5
oExplicit memory was okay, what does explicit memory depend on?
Hippocampus
oWhen the two groups were compared, their patterns of data are different
oHippocampus damaged will experience the elevated peak when shown
conditioned stimulus but could not explicitly report on it
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