Objective: Investigation of the influence of attention span and working memory on verbal and nonverbal cognition and early-middle-late stages of rote aural memorization. Method: Digit Span (DS) forward and backward and Letter-Number Sequencing measures from the WAIS-III were factorially combined to create composite measures of attention span and working memory. These measures then were factored with early, middle and late phase components of the nine-digit form of the Serial Digit Learning Test (SDL9), age and educational level. Results of that analysis were refactored with the Processing Speed (PS), Perceptual Organization (PO) and Verbal Comprehension (VC) components of the WAIS-III. Results: Working memory measures were selectively associated with fluid PS and PO nonverbal cognitive skills, age, and middle and late trial SDL9 performance. Attention span measures were selectively associated with VC, educational level, and SDL9 early trial performance. Conclusion: Strategic working memory is necessary for performance of nonverbal fluid reasoning tasks....

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