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Secondary reinforcement refers to a stimulus that becomes reinforcing after being paired with a primary reinforcer. It does not have intrinsic value, but gains value through its association with something rewarding.
Primary reinforcement is a stimulus that naturally satisfies a biological need or desire, such as food or water.
Positive reinforcement involves adding a desirable stimulus to increase the likelihood of a behavior occurring again.
Negative reinforcement involves removing an aversive stimulus to increase the likelihood of a behavior occurring again.