Health And Medicine

Motion Sensors In Eyes Identified

Any ideas how your eyes identify something coming to your way unexpectedly and avoid you from getting hit, or prevent something like accident from happening? Now the scientists at Washington University School of Medicine in St. Louis have identified eye’s motion sensors responsible for that rapid reaction after being studied on mice.

Motion Sensors In Eyes Identified

They have identified specific cell types that form a neural circuit in the retina at the back of eye that carries signal from the eye’s photoreceptors to the brain’s visual cortex, which then get translated into an image, enabling the eye to detect movement.

“This ability to detect motion is key for animals, allowing them to detect the presence of predators,” said Daniel Kerschensteiner, MD, an assistant professor of ophthalmology and visual sciences.


The identified specific type of cell is known as an amacrine cell – a small nerve cell within the retina which is responsible for detecting motion.

These amacrine cells make certain that the brain does not get flooded with too much visual information, which could distort an image, by refraining the activity of others cells called ganglion cells or gangliocytes.

The researchers also showed that when there is motion in the visual field, a specific secondary type of amacrine cell excites ganglion cells, signaling the brain so it becomes aware that an object is in motion.



The researchers hope with the study of this type, they would be able to build artificial retinas for people who have suffered vision loss.

[Hat Tip: Washington University in St. Louis; eLIFE: An excitatory amacrine cell detects object motion and provides feature-selective input to ganglion cells in the mouse retina]


  1. Thanks for another informative post.

    I’ve had 2 surgeries for retinal detachment. After those surgeries I found it hard to track objects (a busy airport looks like a blur of colors(and I rely on color a lot to tell me about my environment). If I’m still long enough and the surrounding area is still, I can see a lot better. I’m wondering if the secret to my vision problems are buried under the lack of understanding about what the inner cells of the retina can do?

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