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The Somatosensory "Homunculus"
and
Tactile Acuity

The somatosensory Homunculus is a graphic representation of how much
of somatosensory cortex is devoted to processing stimuli from different areas
of the body. The more space in cortex for processing, the higher the tactile
acuity and the smaller the receptive field.

Tactile Acuity: The Two-Point Threshold
Smallest separation between 2 points on the skin that is perceived as 2 separate points