Sentence:  It seems clear , when one takes into consideration the exceedingly defective eyesight of the patient ( we shall describe it in detail in connection with our second question , the one concerning the psychical blindness of the patient ) , that he had to rely on his sense of touch much more than the usual portfolio maker and that consequently that <WSD>faculty</WSD> was most probably more sensitive to shape and size than that of a person with normal vision . 
Meaning of the word marked with <WSD> tags:  one of the inherent cognitive or perceptual powers of the mind