Executive attention in schizophrenic males and the impact of COMT Val108/158Met genotype on performance on the attention network test.

Abstract:

BACKGROUND:Executive control of attention in schizophrenia has recently been assessed by means of the Attention Network Test (ANT). In the past, for tasks assessing executive attention, findings in schizophrenia have been contradictory, among others suggesting a lack of increased stimulus interference effects. Attention and executive functioning are substantially influenced by candidate genes of schizophrenia, including the functional single-nucleotide polymorphism catechol-o-methyltransferase (COMT) Val108/158Met, with task-dependent, specific effects of Met allele load on cognitive function. Therefore, we aimed at investigating executive attention in schizophrenic patients (SZP) as compared with healthy controls (HC), and to assess the specific impact of COMT Val108/158Met on executive attention, using ANT. METHODS:We applied ANT to 63 SZP and 40 HC. We calculated a general linear model to investigate the influence of affection status and the COMT Val108/158Met genotype on executive attention as assessed by the ANT. RESULTS:Multivariate analysis of variance revealed a significant effect of group on executive attention. SZP exhibited smaller conflict effects in the ANT. Met allele load significantly modulated executive attention efficiency, with homozygous Met individuals showing low overall reaction time but increased effects conflicting stimulus information in executive attention. CONCLUSIONS:Our data suggest a disease-related dissociation of executive attention with reduced conflict effects in SZP. Furthermore, they support the hypothesis of differential tonic-phasic dopamine activation and specific dopamine level effects in different cognitive tasks, which helps interpreting contradictory findings of Met allele load on cognitive performance. Disease status seems to modulate the impact of COMT Val108/158Met on cognitive performance.

journal_name

Schizophr Bull

journal_title

Schizophrenia bulletin

authors

Opgen-Rhein C,Neuhaus AH,Urbanek C,Hahn E,Sander T,Dettling M

doi

10.1093/schbul/sbm155

subject

Has Abstract

pub_date

2008-11-01 00:00:00

pages

1231-9

issue

6

eissn

0586-7614

issn

1745-1701

pii

sbm155

journal_volume

34

pub_type

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