Related Experiment Video
Updated: Jul 20, 2026

09:42
Simultaneous Electrophysiological Recording and Calcium Imaging of Suprachiasmatic Nucleus Neurons
Published on: December 8, 2013
Circadian photoreception: spotlight on the brain.
Steven W Lockley1, Joshua J Gooley
1Division of Sleep Medicine, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA. slockley@hms.harvard.edu
Current Biology : CB
|September 19, 2006
Summary
The mammalian eye does more than just see; it detects light for non-visual responses. New research is identifying brain regions involved in this human eye light detection.
Area of Science:
- Ophthalmology
- Neuroscience
- Physiology
Background:
- The mammalian eye possesses photoreceptors beyond those for vision.
- Light detection by the eye influences numerous physiological and behavioral processes.
- These non-visual light responses are distinct from conscious sight.
Discussion:
- Recent investigations are mapping brain areas activated by non-visual photoreception.
- Understanding these neural pathways is crucial for comprehending light's broader impact.
- This research bridges the fields of ophthalmology and neuroscience.
Key Insights:
- Specific brain regions are identified as key centers for processing non-visual light signals.
- The study highlights the eye's role in regulating circadian rhythms and other non-visual functions.
- Evidence points to a complex interplay between light, the eye, and brain function.
Outlook:
- Further research will elucidate the precise mechanisms of non-visual photoreception.
- This knowledge may lead to novel therapeutic strategies for sleep disorders and mood regulation.
- Future studies aim to fully map the non-visual light response network in the human brain.
Related Concept Videos
Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
Photoreceptors and Visual Pathways
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Anatomy of the Eyeball
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
The Pineal Gland
The pineal gland, a diminutive endocrine structure named for its pinecone-shaped appearance, is situated atop the third ventricle within the diencephalon region of the forebrain. This gland, composed of secretory cells known as pinealocytes arranged in compact cords and clusters around dense particles of calcium salts, plays a pivotal role in hormonal regulation.
The primary secretion of the pineal gland is the hormone melatonin, derived from serotonin. The concentration of melatonin in the...
The primary secretion of the pineal gland is the hormone melatonin, derived from serotonin. The concentration of melatonin in the...
Biological Clocks and Seasonal Responses
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.