Blindsight: How the Brain can See Despite Visual Damage

by Tanya on  October 16, 2008 at 8:48 AM Research News
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Blindsight: This is an interesting phenomenon in which despite damage to the primary visual cortex, the brain can tell where an object is though rendered unable to see it. A recent study on monkeys has brought into focus more information on this strange fact.

Professor Tadashi Isa and Dr. Masatoshi Yoshida, who led the study at the National Institute for Physiological Sciences in Japan, said that they had uncovered compelling evidence that blindsight occurs because visual information is conveyed bypassing the primary visual cortex.

Published in the Journal of Neuroscience, their findings have been backed by Japan Science and Technology Agency supported.

For their research, the researchers recorded eye movements of the monkeys that had damage in one side of the primary visual cortex.

The animals were trained with an eye movement task for two to three months, enabling them to move their eyes to the correct direction where an object was even in the affected side of their visual fields.

The researchers said that the animals' brains became able to feel where an object was without 'seeing' it.

According to them, the eye movements among the trained monkeys looked almost normal, for they could discriminated five different directions even in the affected visual field.

With a view to determining how eyes move, the monkeys' eye movements to targets in their affected visual field were compared with those to dark targets in their normal visual field.

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