“The brain represents the external world as specific maps of activity created by networks of neurons,”

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“Most of these maps have been studied in the excitatory circuits of the brain because excitatory neurons in the cortex outnumber inhibitory neurons.”

The studies of excitatory maps have revealed that they begin as a diffuse and overlapping network of cells. “With time,” said Arenkiel, “experience sculpts this diffuse pattern of activity into better defined areas, such that individual mouse whiskers, for instance, are represented by discrete segments of the brain cortex. This progression from a diffuse to a refined pattern occurs in many areas of the brain.”

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