Abstract
Herein is reported the case of a 63-year-old man who underwent surgery for wrist disarticulation, but who has made skillful use of a work arm with C hook in his livelihood as a gardener for 35 years. The patient has a sensitive touch sense for discrimination at the tip of his C hook, which I believe could be a sensory projection from his stump. Sensory projection is a phenomenon in which a person experiences a spatial sensation outside his or her body. In the case of an amputee, this is felt where a limb or digits no longer exist. I believe that sensitive two-point discrimination at 3mm intervals distributed in the stump skin is projected to the C hook as a touch sense. This case was able to identify a good position with his C hook without looking at an object or place. He said that he recognized the orientation of the tip points of C hook respectively as the index finger and the thumb of his phantom limb. With his eyes closed, he was able to tie a rope very quickly with his work arm. I think these actions could be achieved by using sensory projection with the phantom limb.
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