Cortical responses to patterns of two-point cutaneous stimulation.

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Abstract
Cortical responses evoked by mechanical cutaneous stimulation were mapped in 6 anesthetized cats. Punctate and vibratory stimuli, delivered to the upper lip, were either single-point, or simultaneous, 2-point presentations. The cortical response field activated by simultaneous 2-point stimulation proved to lie within the boundaries of the response fields activated by the separate stimulation of the same 2 cutaneous loci. The field is essentially unitary, and is reduced in surface area when compared to the sum of the surface areas activated by the nonsimultaneous presentations. These findings suggest that central representation of patterned tactile stimulation is distinctive and involves complex neural interactions, the site of which is presently unknown.

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