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Objective measurement of motor activity during cognitive performance in adults with attention\u2010deficit\/hyperactivity disorder.<\/jats:p><jats:p><jats:bold>Objective:\u2002<\/jats:bold> This study investigates whether hyperactivity, i.e. an increased level of motor activity, can be observed in adults with attention\u2010deficit\/hyperactivity disorder (ADHD).<\/jats:p><jats:p><jats:bold>Method:\u2002<\/jats:bold> An infrared motion\u2010tracking system was used to measure motor activity in 20 unmedicated adults with ADHD and 20 matched healthy controls (HC) during a 1\u2010back working memory task.<\/jats:p><jats:p><jats:bold>Results:\u2002<\/jats:bold> Motor activity was higher in ADHD. It increased with the duration of testing and co\u2010varied with cognitive performance in ADHD only. Subjective and objective measurements of motor activity were related in HC, but not in ADHD.<\/jats:p><jats:p><jats:bold>Conclusion:\u2002<\/jats:bold> Higher levels of motor activity in ADHD are objectively measurable not only in children, but in adults as well. It is linked to cognitive performance arguing against distinguishable diagnostic subtypes. 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