From point to plane in the brain: dimensional expansion. “But, interestingly, tonotopic projections are not point to-point. Each characteristic frequency point on basilar membrane projects to an iso-frequency plane across the extent of the cochlear nucleus. Thus cochlear place representation is expanded into a second dimension in brain. These tonotopic sheets are preserved in projections all the way to cortex. We contrast this with the visual and somatosensory systems, where maps reflect a location of stimulus in space and the representations are point to point. “

From point to plane in the brain: dimensional expansion.
 
“But, interestingly, tonotopic projections are not point to-point. Each characteristic frequency point on basilar membrane projects to an iso-frequency plane across the extent of the cochlear nucleus.
 
Thus cochlear place representation is expanded into a second dimension in brain.
 
These tonotopic sheets are preserved in projections all the way to cortex. We contrast this with the visual and somatosensory systems, where maps reflect a location of stimulus in space and the representations are point to point. “

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