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Lecture

Psychology 3325 Lecture Notes - Entorhinal Cortex, Temporal Lobe, Limbic System


Department
Psychology
Course Code
Psychology 3325
Professor
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 special receptors such as those to motior body temperature; also
controls pituitary glands, which in turn controls endocrine gland and controls internal
organs through ANS
hypothalamus can control homeostatic processes directly and automatically through
its control of pituitary gland and ANS or it can cause neural circuits in cerebral cortex
to execute more complicated learned behaviour
amygdala and hippocampus, both located in temporal lobe, are important parts of
limbic system
amygdala emotions and emotial behaviour
defence and agression
plays important role in physiological reactiosn that have beneficial effects in
short run but can lead to stress-related illnesses if they become chronic
hippocampus is involved in learning and memory
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