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Psychology (9,695)
PSYC18H3 (275)
Chapter 6

Chapter 6 Notes

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Department
Psychology
Course
PSYC18H3
Professor
Michelle Hilscher
Semester
Fall

Description
Chapter 6 Emotions and the BrainStory of sleeping sicknesstreatment process shows how brain regions and neurotransmitters are intimately involved in emotionBrain mechanisms are studied by through neuroimaging lesions stimulation pharmacology and electrical recordingNeuroimagingPET and fMRIHindbrain primitive aspects of the brainmedullarespiratory functionsponssleep cycleForebrainThalamussensory info relay centerHypothalamusHippocampusLimbic Systemincludes amygdalaCortexDescartes Hydraulics ProposalEven if the concept was wrong the idea of events provoking sensory receptors which thereby send info to brain which then signals to the muscles is an ideal framework and is still used todayHowever emotions are not simply reflexes they are more complexEarly Research on Brain Lesions and StimulationCannonfound that removing cortex from cats resulted in sham rageaggressivenessso it appears as though cortex is responsible for inhibiting primitive reflexesHughlings JacksonCannons was really a continuation of his workhe suggested that lower levels the brain such as the hindbrain was responsible for reflexes and the more recently evolved ones are responsible for emotionHessBrugercomplimented Cannons work by finding that angry behaviour was elicited by electrical stimulation to the hypothalamusThe Limbic SystemMacleanoffers a more recent theoryinspired by Papezs idea of 3 pathwaysMaclean suggested that human forebrain has 3 distinct systemsStriatal RegionEarliest and most basic part of the forebrainEnlarged with the evolution of reptilesDevoted to schedulinggenerating basic behaviors hunting grooming mating migrationDamageas in Huntingtonsunable to organize daily activitesThe Limbic SystemDeveloped when mammals diverged from reptilesMammals were a lot more socialhad close attachments between family members whereas reptiles did notDeveloped to enable mammals increasing socialityMacleans interest in the limbic system stemmed from researchdiscovery that removal of part of the limbic system amygdala led to tame monkeys and the discovery of pleasure centers in the brain ratsfoodSeptal RegionStimulationtendency to approachWhether something is pleasurable or unpleasurable in the limbic system is dependant on this ability to approachInsight into limbic system is also provided by the study of temporal lobe epilepsy in which
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