exogenous zeitgebeters

Question 1

exogenous Zeitgebers and sleep wake cycle

Answer 1

external factors that reset biological clock via entrainment

free running cycles are brought into line by external factors

Question 2

light

Answer 2

resets SCN and influence hormone secretion and blood circulation

Question 3

Campbell and Murphy 1998

Answer 3

shone light at the back of 15 participants knee caps at various wake up times

sleep wake cycle deviated by up to 3 hours

shows that skin receives light too not just eyes

shows importance of light as Zeitgeber

Question 4

social cues

Answer 4

things like meal times

baboes at 6 weeks start circadian rhythms and by 16 weeks they are entrained by adult set meal and bed times

jet lag is more effectively beaten by adapting to local meal and sleep times rather than responding to internal feelings of hunger and fatigue