Sentence:  The authors set about answering this fundamental question through a detailed investigation of the patient 's ability , tactually , ( 1 ) to perceive figure and ( 2 ) to <WSD>locate</WSD> objects in space , with his eyes closed ( or turned away from the object concerned ) . 
Meaning of the word marked with <WSD> tags:  determine or indicate the place, site, or limits of, as if by an instrument or by a survey