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Pupil dilation is an indirect index of arousal, modulated by the autonomic nervous system and activity in the locus coeruleus-noradrenergic system. In the current study, pupil dilation was recorded while 8- to 12- year old children (<jats:italic>n<\/jats:italic>= 71, 26 with a diagnosis of ADHD and 45 typically developing), viewed images of emotional faces. Parent-rated hyperactive\/impulsive symptoms were uniquely linked to higher pupil dilation to happy, but not fearful, angry, or neutral faces. This was not explained by comorbid externalizing symptoms. Together, these results suggest that hyperactive\/impulsive symptoms are associated with hyperresponsiveness to approach-related emotional cues across a wide range of symptom severity.<\/jats:p>","DOI":"10.1017\/s0954579420000036","type":"journal-article","created":{"date-parts":[[2020,2,27]],"date-time":"2020-02-27T09:35:33Z","timestamp":1582796133000},"page":"767-777","update-policy":"https:\/\/doi.org\/10.1017\/policypage","source":"Crossref","is-referenced-by-count":23,"title":["Increased pupil dilation to happy faces in children with hyperactive\/impulsive symptoms of ADHD"],"prefix":"10.1017","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8222-1699","authenticated-orcid":false,"given":"Johan Lundin","family":"Kleberg","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1307-4928","authenticated-orcid":false,"given":"Matilda 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