The effects of light reinforcement and noise on young and old squirrel monkeys (Saimiri sciureus)

In two age groups of squirrel monkeys, subjects performed an operant response for light onset in the presence or absence of white noise. Results of the study indicate that light is an effective reinforcer for both younger and older monkeys, but differentially. The study also indicates that the presence of white noise affects responding in both age groups dissimilarly.