Humans with latent toxoplasmosis display altered reward modulation of cognitive control.

Autor:	Stock AK; Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Faculty of Medicine of the TU Dresden, Schubertstr. 42, 01307, Dresden, Germany. Ann-Kathrin.Stock@uniklinikum-dresden.de., Dajkic D; Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Faculty of Medicine of the TU Dresden, Schubertstr. 42, 01307, Dresden, Germany., Köhling HL; Institute of Medical Microbiology, University Hospital Essen, University of Duisburg-Essen, Virchowstr. 179, 45147, Essen, Germany., von Heinegg EH; Institute of Medical Microbiology, University Hospital Essen, University of Duisburg-Essen, Virchowstr. 179, 45147, Essen, Germany., Fiedler M; Institute of Virology, University Hospital, University of Duisburg-Essen, Virchowstr. 179, 45147, Essen, Germany., Beste C; Cognitive Neurophysiology, Department of Child and Adolescent Psychiatry, Faculty of Medicine of the TU Dresden, Schubertstr. 42, 01307, Dresden, Germany.; Experimental Neurobiology, National Institute of Mental Health, Klecany, Czech Republic.
Jazyk:	angličtina
Zdroj:	Scientific reports [Sci Rep] 2017 Aug 31; Vol. 7 (1), pp. 10170. Date of Electronic Publication: 2017 Aug 31.
DOI:	10.1038/s41598-017-10926-6
Abstrakt:	Latent infection with Toxoplasma gondii has repeatedly been shown to be associated with behavioral changes that are commonly attributed to a presumed increase in dopaminergic signaling. Yet, virtually nothing is known about its effects on dopamine-driven reward processing. We therefore assessed behavior and event-related potentials in individuals with vs. without latent toxoplasmosis performing a rewarded control task. The data show that otherwise healthy young adults with latent toxoplasmosis show a greatly diminished response to monetary rewards as compared to their non-infected counterparts. While this selective effect eliminated a toxoplasmosis-induced speed advantage previously observed for non-rewarded behavior, Toxo-positive subjects could still be demonstrated to be superior to Toxo-negative subjects with respect to response accuracy. Event-related potential (ERP) and source localization analyses revealed that this advantage during rewarded behavior was based on increased allocation of processing resources reflected by larger visual late positive component (LPC) amplitudes and associated activity changes in the right temporo-parietal junction (BA40) and left auditory cortex (BA41). Taken together, individuals with latent toxoplasmosis show superior behavioral performance in challenging cognitive control situations but may at the same time have a reduced sensitivity towards motivational effects of rewards, which might be explained by the presumed increase in dopamine.
Databáze:	MEDLINE
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