Modulating inhibitory control with direct current stimulation of the superior medial frontal cortex |
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Authors: | Hsu Tzu-Yu Tseng Lin-Yuan Yu Jia-Xin Kuo Wen-Jui Hung Daisy L Tzeng Ovid J L Walsh Vincent Muggleton Neil G Juan Chi-Hung |
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Affiliation: | Institute of Neuroscience, National Yang-Ming University, Taipei 112, Taiwan. |
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Abstract: | The executive control of voluntary action involves not only choosing from a range of possible actions but also the inhibition of responses as circumstances demand. Recent studies have demonstrated that many clinical populations, such as people with attention-deficit hyperactivity disorder, exhibit difficulties in inhibitory control. One prefrontal area that has been particularly associated with inhibitory control is the pre-supplementary motor area (Pre-SMA). Here we applied non-invasive transcranial direct current stimulation (tDCS) over Pre-SMA to test its role in this behavior. tDCS allows for current to be applied in two directions to selectively excite or suppress the neural activity of Pre-SMA. Our results showed that anodal tDCS improved efficiency of inhibitory control. Conversely, cathodal tDCS showed a tendency towards impaired inhibitory control. To our knowledge, this is the first demonstration of non-invasive intervention tDCS altering subjects' inhibitory control. These results further our understanding of the neural bases of inhibitory control and suggest a possible therapeutic intervention method for clinical populations. |
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