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The sensitivity of the Paced Auditory Serial Addition Task (PASAT) to working memory deficits may be enhanced by examining "dyads" (i.e., correct responses immediately preceded by a correct response) as a complement to the traditional total correct summary score. In a sample of 397 mostly African American (79%) healthy adults, total dyad and total correct scores were highly correlated (r = 0.96, p less than 0.001); however, the magnitude of this association diminished in faster stimulus presentation trials, particularly among participants with impaired working memory abilities. (Contains 2 tables.)