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The Limbic System.docx

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PSYC 3325
John Usher

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The Limbic System ● limbic system – set of interconnected structures of brain important in emotional and species- typical behaviour; includes amygdala, hippocampus and limbic cortex ● plays important role in learning and in expression of emotion ● consists of several regions of limbic cortex  limbic cortex – cerebral cortex located around edges of cerebral hemispheres where they join brain stem: part of limbic system ● amygdala – part of limbic system of brain located deep in temporal lobe; damage causes emotional and agressive behaviour  especially affects negative emotions – those caused by painful, threatening or stressful events  controls physiological reactions to help provide energy for short-term activites such as fighting or fleeing  if damaged, does not react to stress and anxiety – animal cannot survive in wild bc cannot compete for food or other resources and often acts in ways to provoke attacks by other animals ● hippocampus – part of limbic system of brain, located in temporal lobe; plays important roles in learning/memory  rats with damage lose ability to use landmarks that locate hidden objects  people lose ability to learn anything new - “yesterday” is time before brain damage occured Summary: ● more primitive parts of brain control homeostasis and species-typical behaviour ● brain stem (medulla, pons, midbrain) controls physiological functions and produces automatic movements such as those used in locomotion, fighting, and sexual behaviour ● cerebellum asists cerbral cortex in carrying out movements (coordiantes control of muscles resulting in smooth movements) and regulates postural adjustments and role in cognitive abilities ● in cerebral hemispheres, thalamus participates in control of movements and relays sensory information to cerebral cortex ● hypothalamus receives sensory information from sense receptors elsewhere in body and also contains its own specia
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