Repetitive Psychometric Measures: Digit Span

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Abstract
Two digit span tests are compared. The first was the traditional test consisting of seven numbers with digits ranging from 4 through 10, and the second, a new test with two forms in which four 8-digit and four 10-digit numbers alternate. High correlations are noted between the test scores in all instances even with the varied test procedures and scoring techniques. The strong influence of the size of number and the lesser influence of practice on the intercorrelations among these tests are shown. A factor analysis established that the new test measured the same factor as the traditional test and that both were essentially independent of the other tests of the Repetitive Psychometric Measures Battery. Reliabilities were maintained or increased slightly in the shorter new test by several techniques. Using the format of the new test, 8 alternate forms were selected from an original battery of 30, based on the results of 12 repetitions of each form by three Ss. These seem sufficiently well equated for potential detection of relatively small changes due to drug, fatigue, motivational, and similar effects.

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