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Daytime light exposure dynamically enhances brain responses
August 22, 2006Exposure to light is known to enhance both alertness and performance in humans, but little is understood regarding the neurological basis for these effects, especially those associated with daytime light exposure. Now, by exposing subjects to light and imaging their brains while they subsequently perform a cognitive test, researchers have begun to identify brain regions involved in the effects on brain function of daytime light exposure. The findings are reported by Gilles Vandewalle and Pierre Maquet of the University of Liîge, Derk-Jan Dijk of the University of Surrey, and additional colleagues and appear in the August 22nd issue of the journal Current Biology, published by Cell Press.
Our brain does not use light only to form images of the world. Ambient light levels are detected by our nervous system and, without forming any image, profoundly influence our brain function and various aspects of our physiology, including circadian rhythms, hormone release, and heart rate. These responses are induced by a special non-image-forming (NIF) brain system, which researchers have begun to characterize in animal models. In human studies, much work has focused on the effects of nighttime light exposure, but little is known about daytime responses to light. Especially mysterious are the neural correlates of these responses, and their temporal dynamics. Such issues are of significant interest given that daytime sleepiness is a major source of complaint in modern society and has considerable socio-economic implications.
In the present study, the researchers showed that a brief (21-minute) morning exposure to a bright white light increases alertness and significantly boosts the brain's responses to an experimental test that requires attention only to sound. In a parallel neuroimaging analysis, this boost in alertness was found to correlate with responses in various areas of the brain, including regions of the cortex known to support performance on the auditory test. The regional brain changes were found to be highly dynamic, dissipating within a few minutes. These new findings therefore show that light exposure, even during the day, can quickly modulate regional brain function in areas involved in alertness and non-visual cognitive processes.
Cell Press
Cell Press
Light Exposure Current Events and Light Exposure News RSSSun exposure may trigger certain autoimmune diseases in women
Ultraviolet (UV) radiation from sunlight may be associated with the development of certain autoimmune diseases, particularly in women.
A research work carried out in mice will contribute to the study of hereditary diseases that lead to blindness
Noticias UGR Researchers of the University of Granada (Spain) have used a technique consisting of the induction of neuronal degeneration neuronal for intense light exposure in the mouse's retina that will be helpful for the study of retinitis pigmentosa (RP), a group of hereditary diseases which lead to blindness and affect more than one million persons a year all over the world.
Sunlight exposure plus low antioxidant levels may place older adults at risk for eye disease
A European study suggests that the combination of low plasma levels of antioxidants and blue light exposure from the sun is associated with certain forms of the eye disease age-related macular degeneration (AMD), according to a report in the October issue of Archives of Ophthalmology, one of the JAMA/Archives journals.
Fluctuations in serotonin transport may explain winter blues
Why do many Canadians get the winter blues? In the first study of its kind in the living human brain, Dr. Jeffrey Meyer and colleagues at the Centre for Addiction and Mental Health (CAMH) have discovered greater levels of serotonin transporter in the brain in winter than in summer.
Brain imaging links chronic insomnia to reversible cognitive deficits without changes in behavior
A neuroimaging study in the Sept. 1 issue of the journal Sleep is the first to find that cognitive processes related to verbal fluency are compromised in people with insomnia despite the absence of a behavioral deficit.
PET scans help identify mechanism underlying seasonal mood changes
Brain scans taken at different times of year suggest that the actions of the serotonin transporter-involved in regulating the mood-altering neurotransmitter serotonin-vary by season, according to a report in the September issue of Archives of General Psychiatry, one of the JAMA/Archives journals.
Mom's mood, baby's sleep: what's the connection?
If there's one thing that everyone knows about newborn babies, it's that they don't sleep through the night, and neither do their parents.
New Approach Sheds Light on Ways Circadian Disruption Affects Human Health
Growing evidence indicates that exposure to irregular patterns of light and darkness can cause the human circadian system to fall out of synchrony with the 24-hour solar day, negatively affecting human health - but scientists have been unable to effectively study the relationship between circadian disruptions and human maladies.
New research on how season of birth may affect nearsightedness and on cornea donor sources
Does season of birth play a role in the development of nearsightedness? Do corneas from older donors meet quality standards for transplant surgery? These are among the topics explored in the April 2008 issue of Ophthalmology, the journal of the American Academy of Ophthalmology.
Bright light therapy eases bipolar depression for some
Bright light therapy can ease bipolar depression in some patients, according to a study published in the journal Bipolar Disorders.
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Light & Exposure for Digital Photographers (Practical Artistry) by Harold Davis (Author) You may be passionate about photography, and own a digital SLR with perhaps more advanced equipment as well. But do the photographs you take with this powerful equipment come out as well as you'd like? With this fascinating and beautifully illustrated book, you learn how to apply the techniques and principles of classic photography so you can make great images with today's digital equipment. Harold Davis, author and renowned fine art photographer, puts the focus in Practical Artistry on light and exposure, two crucial concepts you need to understand and master if you are to truly capture the images you see. Davis presents a generous number of his own images in each chapter, complete with technical information and an explanation of what he was trying to achieve. These striking photographs... |
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Polaris SPD100 Digital Exposure Meter by Polaris Polaris SPD100 is an easy to use flash and ambient light meter. Take accurate meter readings accurate to 1/10th of an F-Stop and get good exposures every time. One of the best values in exposure meters on the market. |
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Northern Exposure - The Complete Fifth Season Starring: William J. White, John Corbett (not Cullum) as Chris Directed By: Joe Napolitano, Randall Miller, Matt Nodella The northern lights are shining down on all 24 hilarious offbeat episodes of The Complete Fifth Season of the Emmy and Golden Globe award-winning series Northern Exposure! Reunite with Dr. Joel Fleischman (Emmy nominee Rob Morrow) Maggie (Emmy nominee Janine Turner) Chris (Emmy nominee John Corbett) and the rest of the beloved and quirky residents of Cicely Alaska as they take on evil spirits cannibalistic ancestors and the birth of a new resident. Digitally restored for outstanding picture and audio quality this 5-disc collection brings all the heartwarming episodes of Season Five to DVD for the first time ever. Follow the moose to fun today!Format: DVD MOVIE Genre:Â TELEVISION/SERIES & SEQUELS UPC:Â 025192666421 Manufacturer No:Â 61026664 |
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Glow-In-The-Dark Finish Recharges With Exposure To Light (Pkg/2) by Krylon Products Krylon Glowz is a unique finish that glows in the dark, providing creative fun as well as a safety feature. Spray this product on wood, metal, plastic, papier-mache', glass, plaster, ceramic, fabrics, paper, wicker, etc. Use it to provide high night visibility on items such as switch plates, porches, railings, holiday decor, sporting equipment, camping gear, bikes and other items that can use an accent or safety touch. The paint recharges itself on exposure to light. There is 6 ounces of material in the can, enough to cover 7 square feet. The paint dries to the touch in 10 minutes and is dry to handle in 1 hour. Recoating can take place anytime. The spray tip requires less force than other products and there is less overspray. The material conforms to all safety regulations. This offer... |
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Bonica Digital Neon XP Strobe Light, Auto Exposure Control by Bonica The Neon-XP underwater slave-strobe comes equipped with the power of its popular predecessors but with added sophistication. User can adjust the number of pre-flashes from 0 to 4, as well as the aperture sensitivity from f 2.0 to f 4.0to match it with most, if not all, digital cameras in the market. A microprocessor controlled exposure sensor automatically regulates the intensity of the flash to provide proper exposure. A farewell to trial-and-error lighting adjustment, it puts point-and-shoot simplicity back into the hands of digital photographers without having to use expensive cameras with TTL metering and sync cord. Specifications Depth Rated 165' / 50m Angle Of Coverage 60° Kelvin Color Temperature 5700° K Flash Modes Auto & Manual Exposure Control Auto: f/2.0... |
![Northern Exposure: Northern Lights [VHS]](http://ecx.images-amazon.com/images/I/519MK1SVB9L._SL160_.jpg) |
Northern Exposure: Northern Lights [VHS] Starring: Rob Morrow, Janine Turner, Barry Corbin, John Cullum, Darren E. Burrows Also With: Henry Bromell (Producer), Jeff Melvoin (Writer), John Falsey (Writer), Jordan Budde (Writer), Joshua Brand (Writer) |
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20 Foot Roll Of Glow String, Glows In Dark After Exposure To Light Source Glow String Glows In The Dark For A Brief Time After Being Held To Alight Source. 20 Feet Per Roll On A Blister Card. Please Order By Thedozen Cards 12 Pieces.Nov107Dz |
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PlugGrip P-1 Wiring Tool with Power Warning Safety Light, Red by PlugGrip * Designed to assist in electrical outlet installations * Allows you to work faster, safer, and smarter * Power warning lights for safety * Secure fit outlet grip provides control over stiff wires * Works with power or manual screwdrivers * Contoured for easy removal after installation * UL listed * Carded |
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KodakBioMax* Light Autoradiography Film (50 Exposures) by Carestream Health BioMax Light-1 Film (Non-Interleaved) 20.3 x 25.4 cm (8 x 10") Double emulsion film provides maximum clarity and sensitivity for detection of chemiluminescent labeled samples. Produces the highest signal-to-noise ratio of any KODAK film for detection of chemiluminescence. Also suitable for direct and intensifying screen exposures with commonly used isotopes. However, the film provides lower sensitivity and requires longer exposure times compared to BioMax MR, BioMax MS and X-OMAT* AR films for radioisotope detection. | |
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