Skip to main content
Top
Published in: Brain Structure and Function 3/2019

01-04-2019 | Original Article

Anodal tDCS affects neuromodulatory effects of the norepinephrine system on superior frontal theta activity during response inhibition

Authors: Nico Adelhöfer, Moritz Mückschel, Benjamin Teufert, Tjalf Ziemssen, Christian Beste

Published in: Brain Structure and Function | Issue 3/2019

Login to get access

Abstract

Medial and superior frontal theta oscillations are important for response inhibition. The norepinephrine (NE) system has been shown to modulate these oscillations possibly via gain control mechanisms, which depend on the modulation of neuron membrane potentials. Because the latter are also modulated by tDCS, the interrelation of tDCS and NE effects on superior frontal theta band activity needs investigation. We test the hypothesis that anodal tDCS affects modulatory effects of the NE system on theta band activity during inhibitory control in superior frontal regions. Using EEG beamforming, theta band activity in the superior frontal gyrus (SFG) was integrated (correlated) with the pupil diameter data as an indirect index of NE activity. In a within-subject design, healthy participants completed a response inhibition task in two sessions in which they received 2 mA anodal tDCS over the vertex, or sham stimulation. There were no behavioral effects of anodal tDCS. Yet, tDCS affected correlations between SFG theta band activity time course and the pupil diameter time course. Correlations were evident after sham stimulation (r = .701; p < .004), but absent after anodal tDCS. The observed power of this dissociation was above 95%. The data suggest that anodal tDCS may eliminate neuromodulatory effects, likely of the NE system, on theta band activity during response inhibition in a structure of the response inhibition network. The NE system and tDCS seem to target similar mechanisms important for cognitive control in the prefrontal cortex. The results provide a hint why tDCS often fails to induce overt behavioral effects and shows that neurobiological systems, which may exert similar effects as tDCS on neural processes should closely be monitored in tDCS experiments.
Literature
go back to reference Chance FS, Abbott LF, Reyes AD (2002) Gain modulation from background synaptic input. Neuron 35:773–782CrossRefPubMed Chance FS, Abbott LF, Reyes AD (2002) Gain modulation from background synaptic input. Neuron 35:773–782CrossRefPubMed
go back to reference Evans JD (1996) Straightforward statistics for the behavioral sciences. Brooks/Cole Publishing Company, Pacific Grove Evans JD (1996) Straightforward statistics for the behavioral sciences. Brooks/Cole Publishing Company, Pacific Grove
go back to reference Faul F, Erdfelder E, Lang A-G, Buchner A (2007) G*Power 3: a flexible statistical power analysis program for the social, behavioral, and biomedical sciences. Behav Res Methods 39:175–191CrossRefPubMed Faul F, Erdfelder E, Lang A-G, Buchner A (2007) G*Power 3: a flexible statistical power analysis program for the social, behavioral, and biomedical sciences. Behav Res Methods 39:175–191CrossRefPubMed
go back to reference Nitsche MA, Paulus W (2000) Excitability changes induced in the human motor cortex by weak transcranial direct current stimulation. J Physiol 527 Pt 3:633–639CrossRef Nitsche MA, Paulus W (2000) Excitability changes induced in the human motor cortex by weak transcranial direct current stimulation. J Physiol 527 Pt 3:633–639CrossRef
go back to reference Phillips MA, Szabadi E, Bradshaw CM (2000) Comparison of the effects of clonidine and yohimbine on spontaneous pupillary fluctuations in healthy human volunteers. Psychopharmacology 150:85–89CrossRefPubMed Phillips MA, Szabadi E, Bradshaw CM (2000) Comparison of the effects of clonidine and yohimbine on spontaneous pupillary fluctuations in healthy human volunteers. Psychopharmacology 150:85–89CrossRefPubMed
go back to reference Servan-Schreiber D, Printz H, Cohen JD (1990) A network model of catecholamine effects: gain, signal-to-noise ratio, and behavior. Science 249:892–895CrossRefPubMed Servan-Schreiber D, Printz H, Cohen JD (1990) A network model of catecholamine effects: gain, signal-to-noise ratio, and behavior. Science 249:892–895CrossRefPubMed
Metadata
Title
Anodal tDCS affects neuromodulatory effects of the norepinephrine system on superior frontal theta activity during response inhibition
Authors
Nico Adelhöfer
Moritz Mückschel
Benjamin Teufert
Tjalf Ziemssen
Christian Beste
Publication date
01-04-2019
Publisher
Springer Berlin Heidelberg
Published in
Brain Structure and Function / Issue 3/2019
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-019-01839-3

Other articles of this Issue 3/2019

Brain Structure and Function 3/2019 Go to the issue