Modulating perceptual-attentional conflicts through the combination of tDCS and atVNS – a psychophysiological study

• Applicant: Professor Dr. Christian Beste
• Subject Area: Biological Psychology and Cognitive Neuroscience
• Term: since 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 551819189

The goal of this study is to provide mechanistic insights into the neural processes underlying perceptual-attentional conflicts by using tDCS, atVNS and the combination of both brain stimulation approaches in a psychophysiological study. Through this, distinct neural dynamics underlying perceptional-attentional conflicts are modulated and the relative contribution of each of the modulated processes for perceptional-attentional conflicts is delineated. The separated and combined effects of anodal tDCS and atVNS are investigated on a behavioral level, on a psychophysiological level (through EEG) and on a peripheral-physiological level (through pupil diameter as an indirect index of catecholaminergic system activity). Aside from its impact within the field of cognitive control, the project will provide a conceptual blueprint and insights into how two non-invasive brain stimulation methods (i.e., anodal tDCS and atVNS) can be combined to obtain mechanistic insights into neural processes cognitive functions. Moreover, aspects related to the replicability of brain stimulation (i.e., anodal tDCS) to modulate conflict monitoring are addressed in the project by taking advantage of data from a previous project – which are re-used and significantly extended in the current project. The replicability aspect of the project is of importance considering the “replication crisis” in the field. The synergies created with a previous project will furthermore provide more interpretatory confidence for the project.

• DFG Programme: Research Grants