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►New visual P300 stimulus was created to assess sensitivity to symmetry/asymmetry. ► Children's P300s were compared to reports of their repetitive behavior. ► Repetitive behavior was significantly associated with faster processing of a deviant. ► Stimulus, measuring sensitivity to asymmetry. ► Similarities to previous research on disorders characterized by repetitive behavior are discussed.
This study examines the link between children's repetitive, ritualistic, behavior and cortical brain activity. Twelve typically developing children between the ages of 6 and 12 years were administered two visual P300, oddball tasks with a 32-electrode electroencephalogram (EEG) system. One of the oddball tasks was specifically designed to reflect sensitivity to asymmetry, a phenomenon common in children and in a variety of disorders involving compulsive behavior. Parents completed the Childhood Routines Inventory. Children's repetitive, compulsive-like behaviors were strongly associated with faster processing of an asymmetrical target stimulus, even when accounting for their P300 latencies on a control task. The research punctuates the continuity between observed brain-behavior links in clinical disorders such as OCD and autism spectrum disorders, and normative variants of repetitive behavior.