internal mechanisms that govern biological rhythms. they can be altered and affected by the environment.
SCN?
lies in the hypothalamus control other biological rhythms, send signals to the pineal glans which leads to increased in melatonin at night.
Exogenous Zeitgebers?
External cues that synchronize our biological rhythms, such as light, temperature, and social interactions.
SNC?
contains light sensitive receptors. melanopsin is a protein in the eye sensitive to the light carries the signals to the SCN to set 24 hr daily body cycle.
Morgan (1955)?
bred hamster with a SCN with a circadian rhythms of 20 hrs, transplanted to normal hamsters which displayed 20 hrs circadian rhythms.
Skene Arendt?
majority of blind people who still have light perception had normal circadian rhythms. those without light perception had an abnormal circadian rhythms.
Biologically reductionist?
Behaviourism would suggest that bodily rhythms are influenced by other people and social norms.
