Using his special chamber,Skinner found that rats would display a behaviour,such as pressing a lever,more frequently if following that behaviour a food pellet was provided.The food pellet acts as a(n):

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A reinforcer is something that strengthens a behaviour, increasing the likelihood of it being repeated in the future. In this case, the food pellet is acting as a reinforcer because it is increasing the frequency of the rats pressing the lever. A punisher, on the other hand, would decrease the likelihood of the behaviour being repeated. "Strengthener" is not a common term used in psychology, and "outcome variable" is not a relevant term in this context.

Using His Special Chamber,Skinner Found That Rats Would Display a Behaviour,such