Summary
This review outlines the structure and function of the suprachiasmatic nuclei (SCN) as the master circadian clock in mammals, explaining how light-dark cycles synchronize daily physiological and behavioral rhythms. For lighting designers and healthcare practitioners, understanding this central clock mechanism underscores the importance of appropriate light exposure timing to support entrainment and overall wellbeing.
Key Findings
- The suprachiasmatic nuclei (SCN) of the hypothalamus serve as the master circadian pacemaker in mammals, driving cyclical changes in physiology and behavior.
- Circadian rhythms persist in constant conditions, confirming their endogenous nature and the SCN's role as an autonomous clock independent of external cues.
- Environmental light-dark cycles are the primary zeitgeber (time-giver) that synchronizes the SCN clock to the external world.
Categories
Sleep & Circadian Health: Reviews the endogenous circadian clock in the SCN and its role in synchronizing physiology and behavior to light-dark cycles.
The Science of Light: Describes how environmental light-dark cycles entrain the mammalian circadian system through the suprachiasmatic nuclei.
Author(s)
HD Piggins, C Guilding
Publication Year
2011
Number of Citations
25
Related Publications
Sleep & Circadian Health
- Phototransduction by retinal ganglion cells that set the circadian clock
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- The twoāprocess model of sleep regulation: a reappraisal
- Melanopsin is required for non-image-forming photic responses in blind mice
- Strange vision: ganglion cells as circadian photoreceptors
The Science of Light
- Phototransduction by retinal ganglion cells that set the circadian clock
- Color appearance models
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Melanopsin is required for non-image-forming photic responses in blind mice