The neural representations of a perceived image and the memory of it are almost the same. New research shows how and why they are different.
Serra Favila, a researcher at Columbia University, and her colleagues studied how the neural representations of perceptions and memories of images differ. The escalating sizes of the “receptive fields” of the neurons in the visual cortex seem to hold the key.But when Favila and her colleagues looked at how perceptions and memories were represented in the various areas of the visual cortex, they discovered major differences.
This suggests that when the memory of the image was stored, only the highest-level representation of it was kept. When the memory was experienced again, all the areas of the visual cortex were activated—but their activity was based on the less precise version as an input. A “really beautiful” aspect of this study was that the researchers could read out the information about a memory directly from the brain, rather than relying on the human subject to report what they were seeing, said
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