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Psych01-Eating.W09 - Why do you eat Why do you stop...

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Why do you eat? Why do you stop?
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Hypothalamus Lateral hypothalamus: hunger (Eat!) electrical stimulation of LH > eating lesion of the LH > produces aphagia Ventromedial hypothalamus: satiation (Stop) electrical stimulation of VMH > stop lesion of VMH > hyperphagia
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What’s hyperphagia?
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LH is the hunger center of the brain. VMH is the satiation center of the brain. There. That was simple.
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It ain’t simple.
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Evidence against the view that the VMH is a satiation center dynamic and static phase force-feeding picky, picky, picky
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Force-feeding If the VMH is gone, animal should not be able to stop eating. So if you force-feed it after the static phase, it should just eat and eat and eat. But animals do stop eating after force- feeding.
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Evidence against the view that the LH is the hunger center Appetite loss is not permanent Effects of pre-operative starvation
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The view that (a) the LH is the hunger center, and (b) the VMH is the satiation center is wrong.
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SET POINT THEORY Lesion of VMH ---- increases set point Lesion of LH – decreases set point
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