A special case of blindness is reported that "you can not see what is stopped, but you can see it if it is moving"

byVictor Freitas

A case of very rare blindness has been reported that a woman who lost sight through stroke or coma has become able to see only "moving things". A woman can see the "roll of a ponytail as his daughter goes away", but that he can not see the "daughter himself".

Psychophysical and neuroimaging responses to moving stimuli in a patient with the Riddoch phenomenon due to bilateral visual cortex lesions - ScienceDirect
https://www.sciencedirect.com/science/article/pii/S0028393218302045

This Woman Has a Strange Type of Blindness - She Can not See Anything Unless It Moves
https://www.sciencealert.com/blind-woman-with-riddoch-syndrome-can-only-see-moving-objects-fmri

Milena Canning, a 48-year-old woman born in Scotland, was not born with visual problems. Mr. Canning had respiratory infection 18 years ago, after having undergone a stroke and 8 months of coma, he lost his eyesight.

Six months after waking up from the coma, Canning said that she saw the sparkling gift bag shining like fireworks, which had lost sight until then. When I visited the ophthalmologist 2 years after that, I did not have the level of sight that I could live satisfactorily, but then I picked up the movement of the ophthalmologist's arm and answered the color of the moving object It is now possible to do. However, what Canning can see is limited to "what is moving".

Doctor Gordon Dutton, who is in charge of Canning, says, "When she leaves her she can see the ponytail shaking horizontally, but she can not see herself. You can see how it flows down the drain, but you can not see the children in the bathtub. "

byJoonas Sild

Dutton recommends the use of a rocking chair to expand the field of view, and when she sees what is in front of her eyes, she acts like shaking the face to the left or right. However, why such a symptom is occurring is said to have been enigmatic.

According to Dutton's advice, in order to conduct further investigations, Canning headed to a research institution named Brain and Mind Institute of Western University in Canada. Therefore, Jody Culham and others, professors of neuropsychology, conducted tests and analyzes including brain scan by fMRI.

As a result of the investigation, Canning was found to be in a state called "Lydok Syndrome". Ridok syndrome is also called "static dynamic visual field dissociation" and it deals with visual informationOccipital lobeWhat caused by obstacles. As a symptom of true opposite, there is also a state called "visual blindness blindness" in which only moving things can be seen while moving.

According to Mr. Culham, in the brain of Canning the entire occipital lobe corresponding to the size of one apple has been lost. Canning's brain has lost the "super highway" in the visual system, but Culham explains that something called "back street" developed on the other hand. Bypasses the connection from the super highway to the brain, so that only "moving" will be delivered as information to other parts of the brain.

byFrank Zienert

The case of Canning is a valuable example showing the plasticity of the brain and the fact that "human and animal brains can be reconnected over a wide range even if damaged". "A patient like Milena shows us what" is possible ", and more importantly, it tells us which visual and cognitive functions are working together" Culham said.