Older adults with visual impairments are 1.3 times more likely to develop mild cognitive impairment, often considered a precursor to Alzheimer's disease, than those with no significant vision loss.
Researchers propose a new theory of what happens in the brain when we experience familiar seeming visual stimuli. The theory, dubbed sensory referenced suppression, suggests the brain understands different levels of activation expected for sensory input and corrects for it, leaving behind the signal for familiarity.
When people make eye contact with another person, their attention is immediately solicited and this causes a distortion in temporal perception. However, the shift in time perception does not change when people glance at non-social items or objects.
Smoking marijuana affects several key visual functions, including 3D vision and contrast sensitivity. However, 90% of cannabis users believe the drug has either no, or minimal, effect on their visual abilities.
People with depression often experience problems with visual perception. Researchers report issues with visual perception are likely linked to information processing differences in the cerebral cortex.
People who suffer from dry eye disease symptoms report visual problems, increased depression and anxiety, and mobility issues. Dry eye disease, researchers say, can have a negative impact on the overall quality of life for sufferers.
Meta-analysis reveals those who have visual impairments or are blind have a higher risk of mortality compared to peers with better vision. The study found mortality risk was 29% higher in those with mild visual impairment and rose to 89% higher for those with severe visual impairments.
A new retinal implant that works in conjunction with camera-equipped smart glasses and a microcomputer provides blind people with "artificial vision" by stimulating retinal cells.
A new neuroimaging study reveals brain patterns that differentiate between men and women are less pronounced in non-heterosexual people. The differences occurred primarily in sensory processing areas of the brain, in particular areas associated with visual processing. Researchers say the brain differences could be linked to a genetic predisposition for same-sex sexual behaviors. The study reveals a neurobiological basis for same-sex attractions.