Sentence:  Therefore , if the sense of touch is functioning normally and there is a complete absence of spatial awareness in a psychically blind person when the eyes are closed and an object is handled , the conclusion seems unavoidable that <WSD>touch</WSD> by itself cannot focus and take possession of the third-dimensionality of things and that actual sight or visual representations are necessary . 
Meaning of the word marked with <WSD> tags:  the faculty by which external objects or forces are perceived through contact with the body (especially the hands)