Speed as a Variable on Three Wisc Performance Subtests

Abstract

This study tested the hypothesis that for younger children of normal intellect, speed of performance plays a minimal if not negligible role in determining the obtained scores on the Block Design, Object Assembly, and Picture Arrangement subtests. It was further argued that if such were the case, then it was not necessary to exclude these subtests in the evaluation of the orthopedically handicapped child capable of manipulating the test materials. Under these circumstances, a poor showing could not be attributed to loss of bonus credits because of slow performance. Results based on five groups of children of normal intelligence ages 7 1/2 through 13 1/2 yr. ( N = 119) indicate that the Block Design and Object Assembly subtests essentially measure a power function through age 10 1/3. Speed is a determinant by age 13 1/2. On the Picture Arrangement subtest, the power function holds only at age 7 1/2. However, a score within normal limits is possible without speed bonuses through age 9 1/2.