Circadian Rhythms Flashcards
1
Q
What is a circadian rhythm?
A
An internal body clock - it controls periods of activity and inactivity
2
Q
How does sunlight affect circadian rhythms?
A
Sunlight cues;
sunlight decreases at the end of the day
the visual system sends signals around the brain to increase the production of melatonin
3
Q
Which people are more likely to experience problems with their sleep/wake cycle?
A
Blind people or night shift workers
4
Q
If there is no sunlight what happens?
A
The rhythm shifts into a 25 hour cycle
5
Q
What happens when the pattern is disrupted?
A
Poor/difficult sleep
6
Q
What was the aim of Michel Siffre’s experiment?
A
To live without clocks in the dark to discover how the brain perceives time
He descended into a cave and found humans have 24-25 hour clock
