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McGill University
NSCI 201
Evan Balaban

LECTURE NOTESEMOTIONS CHP 29Visceral motor system is predominant motor output for emotionEmotion mediates many of the autonomic functions both parasympathetic and sympathetic innervationResearchers can measure things about emotion by measuring variables associated with output for visceral motor system Stimulation of emotional system exhibits high degree of situational specicity ie diff ppl in same situations show similar emotional responses and visceral motor responses however difcult to apply this to general population bc patterns of activation for one indvl not necessarily the same to another indvlrecognition that there is reciprocity in rship btwn outward expression of emotion and autonomic activityexperiment trick ppl into posing faces recognized as angerdisgusthappinessfearsadnesssurprise results in changes in autonomic activity normally associated with that action Doesnt work with pain or terrorused a technique for electrical stimulation Galvonic stimulation that directly causes muscle contractionsputs electrodes on various muscles on the face and record results2 bilateral stimulation of the two cheekbone musclescharacteristic smiling lower face but upper face has no changes compare this to 3 a spontaneous smilethis experiment led to the theory that diff regions of the brain control the expression of the muscles of the upper and lower face during natural face expressions4 no discomfort despite looking in pain two indp systems control mvmnts used for facial expressionsvolitional controlled by descending pyramidal projections from motor cortex and brainstem Synapse on motor neuron pools in facial nucleusdamage lose voluntary control over ability to regulate facial musclesNeural systems for emotional expressionDamage can control facial muscles voluntarily but cannot control involuntarily ie no spontaneous smile from a jokeLeft damage to volitional mvmntCannot move left side of mouthNearly symmetrical spontaneous smileRight damage to neural system for emotional expressionCan smile voluntarilyDespite nding joke funny cannot spontaneously smileLesions that interrupt communication btwn
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