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Repetitive administration of neuropsychological tests can lead to performance improvement merely due to previous exposure. The magnitude of such practice effects (PEs) may be used as a marker of subtle cognitive impairment because they are diminished in healthy individuals subsequently developing Alzheimer's disease (AD).    Methods  To explore the relationship between sociodemographic factors, AD family history (FH), and  APOE  ε4 status, and the magnitude of PE, four subtests of the Wechsler Adult Intelligence Scale‐IV were administered twice to 400 middle‐aged healthy individuals, most of them first‐degree descendants of AD patients.    Results  PEs were observed in all measures. Sociodemographic variables did not show a uniform effect on PE. Baseline score was the strongest predictor of change, being inversely related to PE magnitude. Significant effects of the interaction term  APOE  ε4 ∗ Age in processing speed and working memory were observed.    Discussion  PEs exert a relevant effect in cognitive outcomes at retest and, accordingly, they must be taken into consideration in clinical trials. The magnitude of PE in processing speed and working memory could be of special interest for the development of cognitive markers of preclinical AD.

Modeling practice effects in healthy middle‐aged participants of the Alzheimer and Families parent cohort