Motivation, Biological Clocks, and Temporal Organization of Behavior

  • Irving Zucker


As the preceding quotations illustrate, psychologists have been divided about the value of the concept of motivation. Widely different definitions of motivation abound (cf. Cofer and Appley, 1964); some view it as a “tendency of the whole animal to produce organized activity” (Hebb, 1966, p. 206) while others emphasize its energizing or drive functions, as in Young’s characterization of the study of motivation as a “search for determinants… of human and animal activity” (1961, p. 24). Hinde, in declining to define the term, identifies motivational phenomena as those in which changes in responsiveness to a constant external stimulus can be ascribed to the changing nature of the animal’s internal state (1970, p. 193).


Circadian Rhythm Circadian Clock Estrous Cycle Golden Hamster Suprachiasmatic Nucleus 
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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • Irving Zucker
    • 1
  1. 1.Department of PsychologyUniversity of CaliforniaBerkeleyUSA

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