heteresthesia

A change occurring in the degree (either plus or minus) of the sensory response to a cutaneous stimulus as the latter crosses a certain line on the surface. [heter- + G. aisthesis, sensation]

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het·er·es·the·sia (het″ər-es-theґzhə) [heter- + esthesia] variation in the degree of cutaneous sensibility on adjoining areas of the body surface.