Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/49254
Title: The Impact of Catechol-0-Methyltransferase and Dopamine D4 Receptor Genotypes on Neurophysiological Markers of Performance Monitoring
Author: Krämer, Ulrike M.
Cunillera, Toni
Càmara, E.
Marco Pallarés, Josep
Cucurell, David
Nager, W.
Bauer, P.
Schüle, Rebecca
Schöls, L.
Rodríguez Fornells, Antoni
Münte, Thomas F.
Keywords: Receptors cel·lulars
Neurofisiologia
Dopamina
Cell receptors
Neurophysiology
Dopamine
Issue Date: 2007
Abstract: Dynamic adaptations of one"s behavior by means of performance monitoring are a central function of the human executive system, that underlies considerable interindividual variation. Converging evidence from electrophysiological and neuroimaging studies in both animals and humans hints atthe importance ofthe dopaminergic system forthe regulation of performance monitoring. Here, we studied the impact of two polymorphisms affecting dopaminergic functioning in the prefrontal cortex [catechol-O-methyltransferase (COMT) Val108/158Met and dopamine D4 receptor (DRD4) single-nucleotide polymorphism (SNP)-521] on neurophysiological correlates of performance monitoring. We applied a modified version of a standard flanker task with an embedded stop-signal task to tap into the different functions involved, particularly error monitoring, conflict detection and inhibitory processes. Participants homozygous for the DRD4 T allele produced an increased error-related negativity after both choice errors and failed inhibitions compared with C-homozygotes. This was associated with pronounced compensatory behavior reflected in higher post-error slowing. No group differences were seen in the incompatibility N2, suggesting distinct effects of the DRD4 polymorphism on error monitoring processes. Additionally, participants homozygous for the COMTVal allele, with a thereby diminished prefrontal dopaminergic level, revealed increased prefrontal processing related to inhibitory functions, reflected in the enhanced stop-signal-related components N2 and P3a. The results extend previous findings from mainly behavioral and neuroimaging data on the relationship between dopaminergic genes and executive functions and present possible underlying mechanisms for the previously suggested association between these dopaminergic polymorphisms and psychiatric disorders as schizophrenia or attention deficit hyperactivity disorder.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1523/JNEUROSCI.4229-07.2007
It is part of: Journal of Neuroscience, 2007, vol. 27, p. 14190-1419
Related resource: http://dx.doi.org/10.1523/JNEUROSCI.4229-07.2007
URI: http://hdl.handle.net/2445/49254
ISSN: 0270-6474
Appears in Collections:Articles publicats en revistes (Cognició, Desenvolupament i Psicologia de l'Educació)

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