Biopsychology - Biopsychology: looking directly at...

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Biopsychology : looking directly at biological processes involved in behavior Brain and Behavior: the brain determines what we experience Brain receives, interprets, and acts on information from the world 1
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Basic element of the brain is the NEURON (nerve cell) The nervous system is a network of connections linking neurons to each other A person has almost 100 billion neurons: 1. far more at birth than will survive 2. new connections all through life 3. myelination of 50% neurons after birth 2
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Three kinds of neurons: 1. sensory neurons : carry information from receptor cells to the central nervous system (CNS) 2. motor neurons : carry information from the CNS to muscles, glands and organs 3. interneurons : communication among neurons *Human brain in not the largest nor the greatest in brain weight: body weight. But, it has the largest proportion of interneurons 3
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Structure of a Neuron: Dendrites and cell body ( soma ): receive information from other neurons Axon : transmits information to other neurons Function of the Neuron: Information transmital 4
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Path of transmission (firing of a neuron): 1. When it is not being stimulated, a neuron is in its resting state 2. An impulse (a neurotransmitter or neuromodulator ) from a sending neuron is absorbed by a receptor on the dendrites or the soma of a receiving neuron a. This produces an electro-chemical impulses which will have one of two effects on the receiving neuron, depending upon the nature of the receptor 1. excitatory : makes the receiving neuron more likely to generate an impulse in the dendrites/soma 2. inhibitory : makes it less likely to fire 5
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3. The impulse travels along the cell membrane until it reaches the axon hillock at the top of the axon, where all of the impulses are summated. 4. If there is enough stimulation, an action potential will be triggered in the axon ; the cell has fired 6
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5. The action potential travels down the axon. a. all action potentials have equal
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This note was uploaded on 02/12/2012 for the course PSY 301 taught by Professor Pennebaker during the Fall '07 term at University of Texas at Austin.

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Biopsychology - Biopsychology: looking directly at...

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