Consequences of Cathodal Stimulation for Behavior: When Does It Help and When Does It Hurt PerformanceReport as inadecuate




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Cathodal Transcranial Direct Current Stimulation C-tDCS has been reported, across different studies, to facilitate or hinder performance, or simply to have no tangible effect on behavior. This discrepancy is most prominent when C-tDCS is used to alter a cognitive function, questioning the assumption that cathodal stimulation always compromises performance. In this study, we aimed to study the effect of two variables on performance in a simple cognitive task letter Flanker, when C-tDCS was applied to the left prefrontal cortex PFC: 1 the time of testing relative to stimulation during or after, and 2 the nature of the cognitive activity during stimulation in case of post-tDCS testing. In three experiments, we had participants either perform the Flanker task during C-tDCS Experiment 1, or after C-tDCS. When the Flanker task was administered after C-tDCS, we varied whether during stimulation subjects were engaged in activities that posed low Experiment 2 or high Experiment 3 demands on the PFC. Our findings show that the nature of the task during C-tDCS has a systematic influence on the outcome, while timing per se does not.



Author: Nazbanou Nozari , Kristina Woodard, Sharon L. Thompson-Schill

Source: http://plos.srce.hr/



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