Abstract : From time to time the popular literature has described cases where human subjects were reported to have responded without vision to stimulus objects. This effect--found only in women to date--has been called 'dermo-optical perception,' 'cheek vision,' and 'finger sight.' Whether these responses are to visible light or to some other band of the energy spectrum, and whether they are tactually mediated is not yet clear. The number of such cases is rare and the unusual sensory abilities described suggest that these phenomena merit scientific attention. Early in 1965, it was learned that an American female was reported to have abilities such as those mentioned above. After a number of demonstrations by this subject (A), studies were performed to determine whether A's non-visual discriminations of the visual properties of stimulus objects differed from chance and from the performance level of control subjects. Results of these studies indicated that the subject performed reliably above chance and above the level of the controls as a group in discriminating colors of plastic discs; light projected through two colors of Wratten filters; and in discriminating the suit and number of playing cards. Results also showed that the control subjects tended in some cases to perform reliably above chance, but to a lesser degree than A. Questions as to the nature of this ability were discussed. (Author)

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