"Seeing something that isn't really there could be your brain reacting to feedback between neurons in different parts of the visual system, according to new research.... it signifies that studying neuronal feedback is important to our understanding of how the brain works to process stimuli." This is interesting, too, because it shows that the interaction between neurons in the visual cortex isn't all one way - it's doesn't proceed straight from input layers to output, but sometimes moves back and forward between layers. Cool!
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