Results supported measurement invariance and it was concluded that forward and backward digit span scores should be interpreted as measures of the same cognitive ability. Measurement invariance tests of the precise numerical generalization of trait estimation across groups. The model for Digit Span was then cross-validated in a seizure disorders sample (n = 223) by replication of the CFA and by examination of measurement invariance. To complete the task children need to hold and manipulate (reverse) a series of numbers in their minds. Although the original version of this task was verbally administered, recent versions are generally administered via computer. Digit span is a measure of working memory. Results suggested that four correlated factors underlie Digit Span, reflecting easy and hard items in both forward and backward presentation orders. The Digit Span Task is a simple behavioral measure of working memory capacity, the cognitive ability to store and manage information on a transient basis. The present study explored the dimensionality of the Wechsler Memory Scale-III Digit Span (forward and backward) items in a sample of heterogeneous neuroscience patients (n = 267) using confirmatory factor analysis (CFA) for dichotomous items. Some published research suggests that Digit Span forward should be interpreted differently from Digit Span backward. This goes on until the person can not longer repeat. If the person can repeat the sequence, the a longer sequence is presented. The basic idea of this task is this: A person is presented with a sequence of two digits. The Digit Span subtest from the Wechsler Scales is used to measure Freedom from Distractibility or Working Memory. The digit span task is an absolute classic for anyone interested in short term memory.
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