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Chapter 3

PSYC 1200 - Chapter 3.docx

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University of Manitoba
PSYC 1200
Jason Leboe- Mcgowan

Communication in the Nervous System  Neurons are the basic communication link in the nervous system o They transmit a neural impulse along an axon to a synapse with another neuron o The neural impulse is a brief change in a neuron's electrical charge that moves along an axon  An all-or-none event  Action potentials trigger the release of chemicals called neurotransmitters o They diffuse across a synapse to communicate with other neurons o Transmitters bind with receptors in the postsynaptic cell membrane, causing excitatory or inhibitory PSP's  Most neurons are linked in neural pathways, circuits, and networks  Ach plays a key role in muscular movement  Disturbances in the activity of the monoamine transmitters have been related to the development of depression and schizophrenia  GABA is a widely distributed inhibitory transmitter  Endorphins contribute to the relief of pain Organization of the Nervous System  The nervous system can be divided into the o Somatic nervous system  Connects to muscles and sensory receptors o Autonomic nervous system  Connects to blood vessels, smooth muscle, and glands Looking Inside the Brain: Research Methods  The EEG can record broad patterns of electrical activity in the brain  Lesioning involves destroying a piece of the brain  Electrical stimulation of the brain in certain areas activates them  CT scans, PET scans, MRI scans, and fMRI scans have been developed in recent years The Brain and Behaviour  The brain has 3 major regions: o The hindbrain o The midbrain o The forebrain  Structures in the hindbrain and midbrain handle essential functions  The thalamus is primarily a rely station  The hypothalamus is involved in the regulation of ba
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