Impaired temporal resolution of visual attention and dopamine beta hydroxylase genotype in attention-deficit/hyperactivity disorder

被引:22
作者
Bellgrove, Mark A. [1 ]
Mattingley, Jason B.
Hawi, Ziarih
Mullins, Celine
Kirley, Aiveen
Gill, Michael
Robertson, Ian H.
机构
[1] Univ Melbourne, Sch Behav Sci, Cognit Neurosci Lab, Melbourne, Vic 3010, Australia
[2] Univ Dublin Trinity Coll, Inst Neurosci, Dublin 2, Ireland
[3] Univ Dublin Trinity Coll, Dept Psychiat & Genet, Dublin 2, Ireland
基金
英国医学研究理事会; 爱尔兰科学基金会;
关键词
ADHD; attention; DBH; dopamine; noradrenaline; genetics;
D O I
10.1016/j.biopsych.2006.03.062
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Background: Dopamine beta hydroxylase (D beta H) catalyzes the conversion of dopamine to noradrenaline. Attention-deficit/hyperactivity disorder (ADHD) has been associated with the A2 allele of a Taq I polymoiphism of the DBH gene. Since catecholamines regulate visual attention, we examined whether participants with ADHD were impaired on a task requiring temporal attention and how DBH genotype influenced temporal attention in ADHD. Methods: Thirty-seven children and adolescents with ADHD and 52 matched, normal control subjects participated. Participants were presented with two visual stimuli, separated in time by either 50, 100, or 200 milliseconds, and were asked to judge the temporal order of their onset. Genotypes for the Taq 1 polymorphism were available for 33 of the ADHD participants. Results: Attention-deficit/hyperactivity disorder participants were more error prone than control subjects, particularly when stimuli were presented close together in time (i.e., at the 50 milliseconds asynchrony). Moreover, ADHD individuals homozygous for the A2 allele performed more poorly than those without this allele, and this difference was accentuated at the 50 milliseconds asynchrony. Conclusions: Attention-deficilt/hyperactivity disorder participants have an impaired rate of perceptual processing for rapidly presented visual events. Deficits in the temporal resolution of visual attention in ADHD are associated with the A2 allele of the Taq I DBH polymorohism or another variant with which it is in linkage disequilibrium.
引用
收藏
页码:1039 / 1045
页数:7
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