Neural Control Chapter 5

Neural Control Chapter 5 - Sarah Benjamin 9/24/08 Pysch 11...

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Sarah Benjamin 9/24/08 Pysch 11- Notes Neural Control- Chapter 5 Discussion Requirements Your discussion will be responses to a short presentation of a psychological  concept presented in class For each discussion topic, you will be required to: o Submit one original posting and at least one that is a comment on others  original postings Steps o Go to group pages o Find your group (S) o Go to group discussion board o Click on topic and submit your comments Due Friday, October 3 rd  at 5pm Neuron Individual nerve cell Parts: see figure 5.3 o Dendrites Receive messages from other neurons o Soma Cell body
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o Axon Carry information away from the cell body o Axon terminals Branches that link the dendrites and soma of other neurons o Myelin Sheath Insulates and speeds conduction Simple Guide to How a Neuron Works o Neurons are electrically charged Resting potential (-70 millivolts) More negatively charged particles exist inside the cell than outside Creates electrical charge across membrane o Action potential or nerve impulse All or none—fire or don’t fire Occur at intersection of cell body and axon in motor neurons In sensory neurons, triggered at dendritic ends The number of impulses influence effect on other neurons o These messages are either  Excitatory  or  Inhibitory Excitatory Synapse Increase the rate of impulses triggered Inhibitory Synapse Decreases the rate of impulses Guide to Communications o Excitatory impulse causes neuron to get rid of negatively charged molecules  and take in more positively charged ones
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The charge of the neuron increases o When it reaches +30 millivolts the neuron fires o Impulse travels down the neuron and sends an electrochemical signal to  another neuron Neuron Communication o When a neuron fires it releases 
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Neural Control Chapter 5 - Sarah Benjamin 9/24/08 Pysch 11...

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