And they are not using the visual cortex to do so (at least not area V1). The people with blindsight can recognize images, but they are not conscious of doing so. It is thought that the reason they are still able to subconsciously recognize the contents of the pictures they are shown is due to this older secondary visual pathway.īlindsight is also interesting because it give clues to where visual consciousness might actually physically reside in the brain. The cause of their blindness is damage to area V1 in their visual cortex (not to their eyes). They claim they can't see anything, but the researchers just tell them to take a guess at the answer to the visual recognition task they are given, and they statistically do much better than they should, since they are technically blind. There is a phenomena known as blindsight, where people who are technically blind actually perform much better at visual recognition tests than would make sense.
So, that might be involved in the 'snake' detection scenario you brought up. And the speed of that older primitive visual system is faster. But there is a secondary one through a much older part of the brain that does not involve the visual cortex. The brain actually has multiple pathways for visual recognition The primary one is through the visual cortex. We're getting a little off topic here, but i did want to mention one thing about your 'snake' comment and visual models.
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