Responses of Human Somatosensory Cortex to Stimuli below Threshold for Conscious Sensation

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Science  22 Dec 1967:
Vol. 158, Issue 3808, pp. 1597-1600
DOI: 10.1126/science.158.3808.1597


Averaged evoked responses of somatosensory cortex, recorded subdurally, appeared with stimuli (skin, ventral posterolateral nucleus, cortex) which were subthreshold for sensation. Such responses were deficient in late components. Subthreshold stimuli could elicit sensation with suitable repetition. The primary evoked response was not sufficient for sensation. These facts bear on the problems of neurophysiological correlates of conscious and unconscious experience, and of "subliminal perception."