This study extended the two-point esthesiometer separations used previously in studies of the ability to discriminate two-points from one-point on the dorsal forearm. A yes-no signal detection (TSD) technique was employed. Analysis indicated that subjects reliably discriminate two-points from one-point on the dorsal forearm, and they show a steady increase in sensitivity from 16- to 40-mm two-point signals. In addition, the yes-no TSD approach appears to yield results similar to the fixed-base matching-TSD technique when measuring two-point tactual discrimination.
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