a test in which participants use one hand to feel a geometric figure made of sandpaper, which is hidden from view, and then identify it from among a set of 12 drawings. There are 20 geometric figures in total; 10 are presented to one hand and 10 to the other. The test assesses nonverbal tactile information-processing ability and is scored for the number of correct identifications. [developed in 1983 by Arthur L. Benton and colleagues]