Module 16

Question 1

Interval timers can express rhythms only if ______

Answer 1

They are reset periodically

Question 2

Ultradian rhythms in locomotor activity in many organisms are likely due to ____

Answer 2

Metabolism

Question 3

What is different about locomotor rhythms in voles?

Answer 3

They persist even without feeding schedules, indicating an internal ultradian oscillator

Question 4

Rats and mice often show a ____ activity pattern, which means they _____

Answer 4

• trimodal

- show prominent activity bouts at the beginning, middle, and end of their subjective night

Question 5

How long are vole activity patterns?

Answer 5

2-4 hours

Question 6

What is special about vole ultradian activity patterns in the wild?

Answer 6

The whole population is synchronized

Question 7

How does SCN ablation affect vole ultradian activity patterns?

Answer 7

Does not affect them

Question 8

What is deuteriation and what does it usually cause?

Answer 8

• The process of replacing an animal’s body water with D20, which is “heavy water”
• Slows down circadian rhythms

Question 9

Deuteriation does not affect which 2 things?

Answer 9

• Vole ultradian rhythms

- Food-anticipatory behaviour in rats

Question 10

How does methamphetamine affect arhythmic rats?

Answer 10

Causes a free-running ultradian rhythm, which lengthens as doses increase

Question 11

Why might methamphetamine affect rhythms?

Answer 11

By stimulating dopamine release