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GCSE Psychology · key term
An external cue, such as light, that helps synchronise a biological rhythm with the environment.
Used by OCR
Paper 2
Revise: Functions and Disorders of SleepAn exogenous zeitgeber is an external timing cue. Light is the main example for sleep. Information about light detected by the eyes reaches the SCN, helping synchronise the internal clock with the day–night cycle.
Keep internal clocks and external cues distinct: the SCN is an endogenous pacemaker; light is an exogenous zeitgeber.
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