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Lecture 4

Lecture 4 PSYC 107.docx

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School
Texas A&M University
Department
Psychology
Course
PSYC 107
Professor
Lisa Geraci
Semester
Spring

Description
Keith Owen 1/28/14 PSYC 107 Neuroscience Neuroscience  The study of the nervous system, and the physical and chemical changes involved in  behavior and mental processes. Overview  The nervous system basic and global components.  How scientists learn about the functions of the brain. The Neuron  The basic unit of information processing in the brain. o Communicate to the brain, then out of the system.  Soma: Cell body, contains the nucleus.  Dendrites: Receive stimulation from sensory receptors.  Axon: Long extended fiber along which the neural impulse travels.  Terminal Buttons: Bulb­like structures that contain neurotransmitters at the end of the  axon.  About 100 billion neurons live in the brain. Major Classes of Neurons  Sensory o From sense receptors toward the CNS.  Inner o From sensory to other interneurons or to motor neurons.  Motor o From CNS toward muscles and glands. o After you do an action, your brain then processes the reaction. Action Potentials  Action Potential: o The nerve impulse.  Resting Potential: o Polarization of cellular fluid within a neuron, which provides the capacity to  produce an action potential.  Properties of the Action Potential o All­or­None Law  The size of the action is unaffected by increases in the intensity of  stimulation beyond the threshold level. o Refractory Period  A period during which further stimulation can not cause another action  potential. Synaptic Transmission  Synap
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