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<p>stimuli. Reward cognition serves to increase the likelihood of survival and reproduction by causing associative learning, eliciting approach and consummatory behavior, and triggering <a href="page.php?w=Valence_%28psychology%29">positively-valenced</a> emotions. Thus, reward is a mechanism that <a href="page.php?w=evolution">evolved</a> to help increase the adaptive fitness of animals. In drug <a href="page.php?w=addiction">addiction</a>, certain substances over-activate the reward circuit, leading to compulsive substance-seeking behavior resulting</p><p>
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