circadian rhythm

Researchers at the Salk Institute report the discovery of three cell types in the eye that detect light and align the brain’s circadian rhythm to our ambient light. The study[1] marks the first direct assessment in humans of light responses from these cells, called intrinsically photosensitive retinal ganglion cells (ipRGCs), and the implications for health… Read more

A type of opsin known as neuropsin is expressed in the hair follicles of mice and synchronize the skin’s circadian clock to the light-dark cycle, independent of the eyes or brain, University of Washington researchers report. “This is the first functional demonstration of opsin photoreceptors outside the eye directly controlling circadian rhythms in a mammal,”… Read more

Teens got 43 more minutes of sleep a night after a four-week intervention that reset their body clocks and helped them go to bed earlier, Stanford researchers report[1]. The treatment had two components: brief, early morning flashes of bright, broad-spectrum white light to reset the teens’ circadian clocks, and cognitive behavioral therapy that motivated them… Read more

Rhythms in gene expression in the brain are highly disrupted in people with schizophrenia, according to a new University of Pittsburgh-led study. The findings also suggest that researchers studying schizophrenia-linked genes in the brain could have missed important clues that would help understand the disease. “Our study shows for the first time that there are… Read more

Can your liver sense when you’re staring at a television screen or cellphone late at night? Apparently so, and when such activity is detected, the organ can throw your circadian rhythms out of whack, leaving you more susceptible to health problems. That’s one of the takeaways from two new studies by University of California, Irvine… Read more