Fig. 1.

Experimental apparatus and sample texture responses. (A) Textures were passively presented to the distal finger pads of awake macaques. (B) The rotating drum stimulator—on which the 59 textures were mounted—allows a surface to be scanned across the fingertip at a precise and repeatable speed and depth of indentation into the skin. (C) Sample spiking responses of five neurons each in areas 3b, 1, and 2 to five repetitions of eight textured surfaces.