Endogenous Pacemakers And Exogenous Zietgebers

Question 1

The SCN is a tiny bundle of nerve cells which helps to maintain the circadian rhythms what does it stand for?

Answer 1

Suprachiasmatic nucleus

Question 2

DeCoursey eg al … the SCN connections to the brain in 30… and checked up on 80… later and what happened ?

Answer 2

Destroyed
Chipmunks
Days
Sleep wake cycle had disappeared and many were killed by predators

Question 3

SCN can also effect endogenous mechanisms e.g. the pineal gland explain it?

Answer 3

SCN passes info to pineal gland to produce melatonin at night time to make us sleeply( effects SAD)

Question 4

Are zietgebers external or internal factors

Answer 4

External

Question 5

Campbell and Murphy woke… participants at various times and shone a light on the … of their … proving light doesn’t have to be shone into the eyes or SCN.

Answer 5

15
Backs
Knees

Question 6

What is the sleep wake cycle like in babies and what does it suggest?

Answer 6

It’s random and after 16 weeks it’s entrained suggesting that our sleep wake cycle is down to social cues.