A shift in the activity of a biological rhythm, typically provided by a synchronizing environmental stimulus. 

- Zeitgeber

Phase Shift

The process of synchronizing a biological rhythm to an environmental stimulus. 

- Zeitgeber

Entrainment

The endogenous clock can be adjusted through a variety of means, though the most common is light. 
- Phase shift
- Entrainment 


University of Rochester

California Polytechnic State University, San Luis Obispo

- Types of biological rhythms
- Sleeping and waking
- Changes in biological rhythms
- Suprachiasmatic Nucleus

Focuses of Biological Rhythms

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

Changes in biological rhythms

- Sleep stages
- Sleep patterns over a lifetime
- Sleep onset
- Sleep regularity
- Biological functions of sleep
- Neural systems underlying sleep
- Sleep deprivation
- General anesthetics
- Sleep disorders
- Tracking Information During Sleep
- Sleep-wake cycle

Sleeping and waking

- Circadian rhythms
- Infradian rhythms
- Ultradian rhythms
- Free-running

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