The<unk>  <unk>  is a circadian clock that can be entrained by varying the time of<unk>  presentation. It was discovered when a rhythm was found in rat activity. This was called<unk>  anticipatory activity (FAA), and this is when the wheel-running activity of mice decreases after feeding, and then rapidly increases in the hours leading up to feeding. FAA appears to be present in non-mammals (pigeons/fish), but research heavily focuses on its presence in mammals. This rhythmic activity does not require the suprachiasmatic nucleus (SCN), the central circadian<unk>  in mammals, implying the existence of an<unk> , the<unk> , outside of the SCN, but the mechanism and location of the<unk>  is not yet known. There is ongoing research to investigate if the<unk>  is the only non-light<unk><unk>  in the body.
Food-entrainable oscillator
Tetanic contraction
High-conductance state
Parafunctional activity
Optokinetic response
Circadian rhythm
Vagovagal reflex
Junctional rhythm