Photic and Nonphotic Entrainment in Humans

Question 1

What is the evidence supporting the idea that food anticipatory activity is controlled by a separate food-untrainable circadian clock?

Answer 1

• The food anticipation rhythm persists in constant conditions
• The rhythm has circadian limits to entrainment
• Gradual phase shifting
• Light-entrainable, free-running rhythms can be eliminated by keeping nocturnal rodents in bright light for many weeks or by lesioning the SCN, in rats they can still anticipate a daily meal despite those things