Body temperature (lowest in the early morning, peaks at about 6PM)
Circadian rhythms can sometimes enhance cognitive abilities
Sleep-wake cycle
Affected by light as an exogenous zeitgeber
Exogenous zeitgeber
Acts as a cue, detected by the eye, and then sends a message to the suprachiasmatic nuclei (SCN)
Suprachiasmatic nuclei (SCN)
Located in the hypothalamus, and is known as an endogenous pacemaker
Research investigates what the free-running biological clock might do
Research on free-running biological clock
SIFFRE spent 2 months in a cave in the 1960s, resurfaced in mid-September thinking it was mid-August, his free-running biological rhythm settled to about 25 hours
Exogenous zeitgebers do have an effect on the free-running biological rhythm
The free-running biological rhythm settled to about 25 hours, suggesting exogenous zeitgebers do have an effect
