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• W2807303335 abstract "Learning regularities that exist in the environment can help the visual system achieve optimal efficiency while reducing computational burden. Using a pro- and antisaccade task, studies have shown that probabilistic information regarding spatial locations can be a strong modulator of frontal eye fields (FEF) activities and consequently alter saccadic behavior. One recent study has also shown that FEF activities can also be modulated by transcranial direct current stimulation, where anodal tDCS facilitated prosaccades but cathodal tDCS prolonged antisaccades. These studies together suggest that location probability and tDCS can both alter FEF activities and oculomotor performance, yet how these two modulators interact with each other remains unclear. In this study, we applied anodal or cathodal tDCS over right FEF, and participants performed an interleaved pro- and antisaccade task. Location probability was manipulated in prosaccade trials but not antisaccade trials. We observed that anodal tDCS over rFEF facilitated prosaccdes toward low-probability locations but not to high-probability locations; whereas cathodal tDCS facilitated antisaccades away from the high-probability location (i.e., same location as the low-probability locations in prosaccades). These observed effects were specific to rFEF as tDCS over the SEF in a separate control experiment did not yield similar patterns. These effects were also more pronounced in low-performers who had slower saccade reaction time. Together, we conclude that 1) the overlapping spatial endpoint between prosaccades (i.e., towards low-probability location) and antisaccades (i.e., away from high-probability location) possibly suggest an endpoint-selective mechanism within right FEF, 2) anodal tDCS and location probability cannot be combined to produce a bigger facilitative effect, and 3) anodal rFEF tDCS works best on low-performers who had slower saccade reaction time. These observations are consistent with the homeostasis account of tDCS effect and FEF functioning." @default.
• W2807303335 created "2018-06-13" @default.
• W2807303335 creator A5000553456 @default.
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• W2807303335 date "2018-06-27" @default.
• W2807303335 modified "2023-10-18" @default.
• W2807303335 title "Anodal and Cathodal tDCS Over the Right Frontal Eye Fields Impacts Spatial Probability Processing Differently in Pro- and Anti-saccades" @default.
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• W2807303335 doi "https://doi.org/10.3389/fnins.2018.00421" @default.
• W2807303335 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6030360" @default.
• W2807303335 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29997471" @default.
• W2807303335 hasPublicationYear "2018" @default.
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