Activity decreases in the visual cortex, and people become temporarily almost blind, during

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Activity in the visual cortex decreases during saccadic eye movements, which are quick, simultaneous movements of both eyes in the same direction. This decrease in activity leads to a temporary reduction in visual perception, essentially making individuals almost blind for a very brief period as their eyes move. This phenomenon is known as saccadic masking or saccadic suppression, which helps to maintain a stable perception of the environment despite the rapid movements of the eyes.

Activity Decreases in the Visual Cortex, and People Become Temporarily