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Cover picture: Two-dimensional structure of tactile receptive fields (RFs) of neurons located in the primary somatosensory cortex (area 3b) of alert monkeys. Thirty RFs are shown. All RFs were located on the glabrous surface of one of the distal fingerpads. Each RF map was obtained using the response of a single neuron to a scanned tactile pattern consisting of randomly distributed, raised dots. Each RF is magnified 3.6 times it size on the skin surface. Red regions indicate skin areas where raised stimuli tend to excite the neuron; blue regions indicate areas where raised stimuli tend to inhibit the neuron. The intensity of the color indicates the strength of the effect. The background black (white) region indicates areas where raised dots had no significant effect on the neural response. The results of the study show that area 3b RF structures are essentially unaffected by changes in stimulus scanning velocity from 20 to 80 mm/sec. For details, see the article by DiCarlo and Johnson, in this issue (pages 401-419).