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Biol Psychiatry. 2001 Oct 15;50(8):633-5.

Altered performance on an ocular fixation task in attention-deficit/hyperactivity disorder.

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  • 1Child Psychiatry Branch, National Institute of Mental Health, Bethesda, Maryland, USA.

Abstract

BACKGROUND:

Attention-deficit/hyperactivity disorder (ADHD) is a common psychiatric disorder without validated objective markers. Eye movement studies may be useful in providing objective criteria for characterizing the disorder.

METHODS:

We compared 53 children (29 girls) with ADHD to 44 healthy control children (18 girls) on a 21-sec fixation task. Large saccades (> 4 degrees ) away from the fixation point were analyzed.

RESULTS:

Children with ADHD made more large saccades that interrupted fixation than did control children (p =.001). Mean scores of the ADHD group did not change significantly with subsequent retesting on placebo (p =.11); however, there was poor intrasubject correlation (r =.16).

CONCLUSIONS:

Both boys and girls with ADHD made significantly more intrusive saccades during fixation than did control subjects, possibly reflecting intrinsic neurologic dysfunction; however, a probable "floor effect" obviates conclusions about the reliability of this measure.

PMID:
11690600
[PubMed - indexed for MEDLINE]
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