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Psyc 110 Notes 10-18-2011

Psyc 110 Notes 10-18-2011 - Conclusions Three important...

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Conclusions Three important types of communication in the body are neuronal, neurohormonal and hormonal. Drugs can be agonists or antagonists Agonists – enhance typical effect of a neurotransmitter Antagonists – impose action of neurotransmitter of system. Psychoactive drugs affect chemical transmission in various ways. Occupying receptor and blocking actual transmitter Opponent processes act to maintain homeostasis and may underlie normal affective dynamics as well as tolerance and withdrawal in addiction. Motivation Why is the rat pressing the lever and eating food pellets? To survive and reproduce rats need to get energy from food. Because it’s evolutionary history requires that it has mechanisms that facilitate doing that. It has been reinforced for doing so in the past. It has not eaten for 24 hours. Food is very attractive. A neural circuit that controls feeding behavior is active. According to the reading, regulatory drives are those that Maintain homeostatis. Motivation and incentives Motivation: all the factors that promote certain behaviors at a certain time. Motivational states or drives: internal states with physiological basis (hunger, thirst, lust) Incentives are external goals or reinforcers in the environment (food, water, sex partner) Drives and incentives interact to control the expression of behavior. Coolidge effect Brain stimulation reward In the 1950s, jim olds found rats would press a lever for stimulation of the medial forebrain
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