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Andy Lee (27)
Lecture 10

psyc55-lec10.docx

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Department
Psychology
Course Code
PSYC55H3
Professor
Andy Lee

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Emotion: Anatomical considerations  Papez argues that all these structures are interconnected  Maclean- added certain structures to papez circuit  Now collectively known as limbic system The amygdale  Sits in front of the hippocampus  Consists of multiple nuclei and connects to multiple regions in the brain  Kluver-bucy syndrome- if you take out front of temporal lobe- extremely tame, lack fear, social hierarchy becomes disrupted, no endogenous behaviour, sexual behaviour changes, visual agnosia, the way they explore objects changed- they explored orally  If u selectively lesion amygdala- you get specific type of impairments not whole symptoms  Selective amygdale lesion- rhesus monkeys  Examined behaviour 6-8 months later  Exhibited different behaviours  Normal monkeys- demonstrate neophobia  Amygada lesion- no fear, explored the new things  Control monkeys- food presented own- quick response, by rubber snake- takes time  Lesion monkeys- irrespective whether alone or with snake, monkeys go right ahead and grab the food  First demonstration of amygdale lesion  Role of amygdale in fear processing? Acquiring fear and learning about it  All species demonstrate fear conditioning  Implicitly learn that something is associated with punishment we avoid that- fear conditioning  Before training- show light, no response  In a box give foot shock- very natural startle response, loud noise- startle response  During training- light with a shock- implicitly learns light is associated with shock  Light alone- rat begins to jump  Make the rat jump more by presenting light and shock simultaneously  Le doux- if you lesion amygadala bilaterally- u demolish fear conditioning  2 groups to fear conditioning- direct and indirect  Tone with a shock- rapid quick association – direct- processed subcortically  Slower –indirect- processed by cortical structures  Human evidence- genetic disorder- causes calcification shows lesion in amygdale  SM- Bechara- first condition- fear conditioning- conditioned to learn the blue square with shock – sweat and show fear response  Instructed bias- explicitly said that blue square was associated with shock  Controls- skin conductance response- conditioning- they do show skin conductance response greater than non shocked  SM doesn’t show conditioned response to the shock associated with square but can learn if told explicitly – non-dec intact  WC- had lesions to hippocampus and not amygdale- had no problem demonstrating fear conditioning but was unable to learn by declarative memory  RH- shows implicit and explicit of learning fear impaired  SM- abolishment of implicit fear conditioning response  Just fear conditioning?  Adolphs- showed photographs of pics- tell the expression- what they found is that patient with damage to outside to amygdale correlated with control subjects  SM- specific problem in recognizing expressions from the faces  Scale left- how well it correlates with controls  Both groups of patients perform similarly for except fear- SM struggle to recognize fear and rate the intense of fear  Patient dr- Scott- taking tissue from the amygdale due to epilepsy  Can patient dr recognize fear by auditory stimulus  Played sounds- asked subjects  When sounds were fearful and anger- all other emotions patient df was able to recongize  Had difficulty finding fearful and anger words  SM- they looked at her eye movements- whenever patient looks at faces- she doesn’t look at eyes  Forced to make her look at the eyes- what they found- irrespective whether she looks at the eye or not. Performance on other than f
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