PSY_3_1_28_2010 - 9 - BLOCK the inhibitory interneuron (I)....

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Pain control: Gate Theory i. No stimulation. The inhibitory interneuron (I) blocks the signal in the projection neuron (P). The "gate is closed" and therefore NO PAIN -need key neuron to be activated by the pain neuron. If there is no stimulation then the large and small neurons aren’t firing and there’s no pain. ii. Non-painful stimulation. Large nerve fibers are activated primarily. This activates the projection neuron (P), BUT ALSO activates the inhibitory interneuron (I) which then BLOCKS the signal in the projection neuron (P). The "gate is closed" and therefore NO PAIN iii. Pain stimulation. Small nerve fibers become active. They activate the projection neurons (P) and
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Unformatted text preview: BLOCK the inhibitory interneuron (I). Because activity of the inhibitory interneuron is blocked, it CANNOT block the output of the projection neuron. The "gate is open", therefore, PAIN!!-P is activated and the interneuron here is inhibited. So not only do the small fibers activate the pain neuron but they also inhibit the inhibitory interneuron. So you experience pain. Large fibers faster, stronger influence than small fibers. In order to feel pain you need to be in a situation where you have a lot of activation of small fibers.-Grab or rub the organ that is hurt to activate the large things that will inhibit pain....
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