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The present study compared the performance of preschoolers who met Diagnostic and Statistical Manual of Mental Disorders, 4(th) edition (DSM-IV) criteria for attention-deficit/hyperactivity disorder (ADHD) to those who did not meet these criteria on a test of visual attention. The aim was to investigate whether attentional impairments in preschoolers with DSM-IV ADHD could be detected, informing the nosology of preschool ADHD.

Attention-Deficit/Hyperactivity Disorder in Preschool Children: An Investigation of Validation Based on Visual Attention Performance