title: Dissociable electrophysiological subprocesses during response inhibition are differentially modulated by dopamine D1 and D2 receptors.
abstract: Action control is achieved through a multitude of cognitive processes. One of them is the ability to inhibit responses, for which the dopaminergic systems is known to play an important role. Many lines of psychophysiological research substantiate that two distinct response inhibition subprocesses exist, but it has remained elusive whether they can be attributed to distinct neurobiological factors governing the dopaminergic system. We, therefore, investigated this question by examining the effects of DRD1 (rs4532) and DRD2 (rs6277) receptor polymorphisms on electrophysiological correlates of response inhibition subprocesses (i.e., Nogo-N2 and Nogo-P3) in 195 healthy human subjects with a standard Go/Nogo task. The results show that response inhibition performance at a behavioral level is affected by DRD1 and DRD2 receptor variation. However, from an electrophysiological point of view these effects emerge via different mechanisms selectively affected by DRD1 and DRD2 receptor variation. While the D1 receptor system is associated with pre-motor inhibition electrophysiological correlates of response inhibition processes (Nogo-N2), the D2 receptor system is associated with electrophysiological correlates of outcome evaluation processes. Dissociable cognitive-neurophysiological subprocesses of response inhibition are hence attributable to distinct dopamine receptor systems.
authors.affiliation: Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Faculty of Medicine of the TU Dresden, Germany. Electronic address: christian.beste@uniklinikum-dresden.de.
authors.forename: Christian
authors.initials: C
authors.lastname: Beste
authors.affiliation: Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Faculty of Medicine of the TU Dresden, Germany.
authors.forename: Ann-Kathrin
authors.initials: AK
authors.lastname: Stock
authors.affiliation: Department of Human Genetics, Medical Faculty, Ruhr-Universität Bochum, Germany; Faculty of Health, University Witten/Herdecke, Witten, Germany.
authors.forename: Jörg T
authors.initials: JT
authors.lastname: Epplen
authors.affiliation: Department of Human Genetics, Medical Faculty, Ruhr-Universität Bochum, Germany.
authors.forename: Larissa
authors.initials: L
authors.lastname: Arning
mesh_terms: D000293:Adolescent; D000328:Adult; D004569:Electroencephalography; D055724:Electrophysiological Phenomena / Q000235:genetics*; D005260:Female; D005838:Genotype; D006801:Humans; D007266:Inhibition, Psychological; D008297:Male; D011110:Polymorphism, Genetic / Q000235:genetics; D011597:Psychomotor Performance; D017447:Receptors, Dopamine D1 / Q000235:genetics*; D017448:Receptors, Dopamine D2 / Q000235:genetics*; D055815:Young Adult
chemical_list: C583260:DRD1 protein, human; C581293:DRD2 protein, human; D017447:Receptors, Dopamine D1; D017448:Receptors, Dopamine D2
keywords: DRD1; DRD2; Dopamine; EEG; Response inhibition