Reward system

Certain neural structures, called the reward system, are critically involved mediating the effects of reinforcement. A reward is an appetitive stimulus given to a human or some other animal to alter its behavior. Rewards typically serve as reinforcers. A reinforcer is something that, when presented after a behavior, causes the probability of that behavior's occurrence to increase. Note that just because something is labelled a reward does not necessitate it as a reinforcer.

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