![]() ![]() When the scientists compared the patterns of neural activity, they found that in both cases, the activity occurred in a region called V5, which is located in the middle temporal region of the visual cortex - an area at the back of the head and to the side. In another part of the exercise, the light flashes over a still background. "The brain interprets the flash as part of the moving background, and therefore engages the prediction mechanism to shift the position of the flash." "The background is moving at the same time, so we perceive the flash being dragged along by the motion," Maus explained. The volunteers' brains were scanned as they watched an illusion called the "flash-drag effect," in which brief flashes of light shift over a moving background. Maus and his colleagues studied the brains of six volunteers using functional magnetic resonance imaging (fMRI), which indirectly measures brain activity by measuring changes in the blood flow in the brain. Information that the brain receives from the eye is already out of date by the time it gets to the visual cortex." "The brain actually works rather slow, compared to some electronics or computers that we have today. "The fundamental problem is that our brain doesn't work in real-time," Maus said. This means the brain perceives moving objects to be farther along in their trajectory than what a person actually sees with their eyes, he explained. ![]()
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