Seasonal Photoperiodic Responses of the Human Circadian System

  • Thomas A. Wehr
Part of the Handbook of Behavioral Neurobiology book series (HBNE, volume 12)


Among the many external changes to which organisms must adapt is the special class of changes that predictably recur in association with daily and seasonal cycles in the environment. In the course of their evolution, most forms of life have taken advantage of the predictability of these changes by developing temporal programs that trigger adaptive responses to them in anticipation of their periodic recurrence.


Suprachiasmatic Nucleus Melatonin Secretion Seasonal Affective Disorder Phase Response Curve Circadian Pacemaker 
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Copyright information

© Springer Science+Business Media New York 2001

Authors and Affiliations

  • Thomas A. Wehr
    • 1
  1. 1.Clinical Psychobiology Branch, Intramural Research ProgramNational Institute of Mental HealthBethesda

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