Which psychologist is known for their support of endogenous pacemakers and exogenous zeitgebers?

• A. Sigmund Freud
• B. Andrew Weil
• C. Aschoff + Weber
• D. William James

Answer: (C)

The correct answer is centered around the work of Aschoff and Weber, who were pivotal in the study of biological rhythms, particularly regarding the concepts of endogenous pacemakers and exogenous zeitgebers. Endogenous pacemakers refer to the internal biological clocks that regulate various physiological processes, such as the circadian rhythms that govern sleep-wake cycles. These pacemakers operate on an intrinsic schedule, independent of external cues.

Exogenous zeitgebers, on the other hand, are external environmental cues that can influence these biological rhythms. Examples include light, temperature, and social interactions which can enhance or modify the timing of these internal biological processes. Aschoff and Weber's research explored how these internal and external factors interact, demonstrating the complexity of biological timing systems.

While Freud, Weil, and James have made significant contributions to psychology, they do not specifically address these concepts of biological rhythms in the same manner. Freud focused primarily on psychoanalysis, Weil is known for his emphasis on holistic health rather than biological rhythms, and James's work was integral in the development of functional psychology but did not delve into the specifics of pacemakers and zeitgebers. This makes Aschoff and Weber’s work the best fit for the question provided.