Biopsychology: L10-13

Question 1

Biological rhythms

Answer 1

Distinct patterns of changes in body activity that follow cyclical time periods

Question 2

Circadian rhythms

Answer 2

Once every 24 hours

Driven by the suprachiasmatic nuclei (SCN) in the hypothalamus
- Pacemaker must be reset so that bodies are in synchrony with the rest of the world
- Natural light provides input, setting the body clock to the correct time -> photoentrainment

Question 3

Sleep-wake cycle

Answer 3

• Under homeostatic control
• Strongest sleep drive at 2-4 AM and 1-3PM
• The internal circadian clock is free running (relies on itself)

Question 4

Michel Siffre

Answer 4

• Spent time living underground and woke, ate and slept when he felt like it
• Had roughly a 25 hour circadian rhythm
• Supports the idea of a free running circadian rhythm

Question 5

Core body temperature

Answer 5

• At its lowest (36