Psychology Notes

Psychology Notes - Neurons o Time depends on size of neuron...

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Neurons o Time depends on size of neuron, the amount of mylin sheath, and the distance it has to go o Parts Dendrites Cell Body Axon o Afferent, Efferent, and Interent Neurons o The action potential is about 70 mV o When a neuron fires: Needs time to reset- the absolute refractory period The relative refractory period will fire again, provided there is greater stimulus than required for the first firing A neuron either fires or it doesn’t- there is no in-between If a whole bunch of neurons are fired, that is where a more intense pain comes from. How fast the neuron fires also affects the intensity Brady Kinen (check book) responsible for great amount of pain Temporal summation: if there are two stimuli that are in rapid succession (neither of which alone is enough to reach the action potential), they can be added together to make the neuron fire Spatial summation is the addition of two stimuli that are near each other. o Excitetory Neurons- fire when something is happening o Inhibitory Neurons- fire when nothing is happening o Endorphins- if somebody has lots of endorphins, they don’t feel pain as much o Naloxone- can block receptors for endorphins
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This note was uploaded on 04/07/2008 for the course PSY 301 taught by Professor Pennebaker during the Fall '07 term at University of Texas.

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Psychology Notes - Neurons o Time depends on size of neuron...

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