ABSTRACT
The present paper reports on an experiment that examined whether subjects can discriminate a piece of sandpaper of a certain roughness from that of another, by moving the tip of the right-hand index fmger on the surfaces of the sandpapers with or without intermediate obstacles attached to the fmgertip, and whether the movements systematically vary across different conditions. Their discrimination ability turned out not to be dramatically impeded, at least as far as the obstacles and the range of roughnesses ofthe sandpapers used in this experiment are concerned. However, the way the subjects examined sandpapers with the fingertip varied rather systematically, depending on what type of obstacles was attached to the fmgertip.
