By the second trimester, long before a baby’s eyes can see images, they can detect light. But the light-sensitive cells in the developing retina — the thin sheet of brain-like tissue at the back of the eye — were thought to be simple on-off switches, presumably there to set up the 24-hour, day-night rhythms parents… Read more

A study from researchers at Indiana University has found that a major chemical component in marijuana appears to worsen the primary underpinning of glaucoma: a rise in pressure inside the eye. Treatment of glaucoma is among the most commonly proposed uses of medical marijuana. The chemical that causes this rise in pressure is cannabidiol, or… Read more

Imagine an apple floating in front of you. Now see if you can rotate it around in your mind. Look at it from the top, bottom – does it have any blemishes? How clearly can you see it? Some people see the apple perfectly, like watching a movie, while others have a very poor wavering… Read more

In our eyes, cells called photoreceptors convert the world around us into a pixel-like representation. Our brains must then reorganize this into a representation that reflects the identities of the objects we are looking at. The same object can be represented by very different pixel patterns, depending on its distance from us, the viewing angle… Read more

The ability to remember details, such as the location of objects, inevitably starts to decline in early midlife, the 40s. But it may be the result of a change in what information the brain focuses on during memory formation and retrieval, instead of a decline in brain function, according to a study by McGill University… Read more