Abstract
Abstract The present experiment determined which of four coin shapes, denoted by the number of sides to the coin (4, 7, 10, 12 sides), was most easily discriminated from an assortment of circular coins. Roth visual and tactile discrimination were examined, and two sizes of each coin shape wore tested. Subjects were required to count the number of coins of a specified denomination in an assortment of coins. No subject saw more than one experimental shape. The results indicated that the 10-aided coins were counted faster and generally with greater accuracy than the 4-, 7- or 12-sided coins. This was so for both the largo and the small coins, for both vision and touch. The advantage of the 10-sided coins did not lessen with practice (one-hour test sessions on four successive weekdays).
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