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The Journal of Neuroscience, April 27, 2005, 25(17):4370-4374; doi:10.1523/JNEUROSCI.4437-04.2005

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BRIEF COMMUNICATION
Noradrenergic Stimulation Enhances Human Action Monitoring

Jordi Riba,1,3 Antoni Rodríguez-Fornells,2 Adelaida Morte,1 Thomas F. Münte,3 and Manel J. Barbanoj1

1Centre d'Investigació de Medicaments, Institut de Recerca, Servei de Farmacologia Clínica, Hospital de la Santa Creu i Sant Pau, Departament de Farmacologia i Terapèutica, Universitat Autònoma de Barcelona, 08025 Barcelona, Spain, 2Faculty of Psychology, University of Barcelona and Institució Catalana de Recerca i Estudis Avançats, 08035 Barcelona, Spain, and 3Department of Neuropsychology, Otto von Guericke University, Universitätsplatz 2, 39106 Magdeburg, Germany

Noradrenergic neurotransmission has been associated with the modulation of higher cognitive functions mediated by the prefrontal cortex. In the present study, the impact of noradrenergic stimulation on the human action-monitoring system, as indexed by event-related brain potentials, was examined. After the administration of a placebo or the selective {alpha}2-adrenoceptor antagonist yohimbine, which stimulates firing in the locus ceruleus and noradrenaline release, electroencephalograpic recordings were obtained from healthy volunteers performing a letter flanker task. Yohimbine led to an increase in the amplitude of the error-related negativity in conjunction with a significant reduction of action errors. Reaction times were unchanged, and the drug did not modify the N2 in congruent versus incongruent trials, a measure of preresponse conflict, or posterror adjustments as measured by posterror slowing of reaction time. The present findings suggest that the locus ceruleus-noradrenaline system exerts a rather specific effect on human action monitoring.

Key words: action monitoring; prefrontal cortex; ERN; yohimbine; noradrenaline; human


Received Oct 27, 2004; revised February 25, 2005; accepted March 7, 2005.




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