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However, less is known about whether they are supported by a common inhibitory mechanism. P3 event\u2010related potentials (ERPs) is a neural signature of motor inhibition, which are found to be generated by several brain regions including the right dorsolateral prefrontal cortex (rDLPFC). However, the relative contribution of rDLPFC to the P3 response associated with speech versus limb inhibition remains elusive. We investigated the contribution of rDLPFC to the P3 underlying speech versus limb movement inhibition. Twenty\u2010one neurotypical adults received both cathodal and sham high\u2010definition transcranial direct current stimulation (HD\u2010tDCS) over rDLPFC. ERPs were subsequently recorded while subjects were performing speech and limb Go\/No\u2010Go tasks. Cathodal HD\u2010tDCS decreased accuracy for speech versus limb No\u2010Go. Both speech and limb No\u2010Go elicited a similar topographical distribution of P3, with significantly larger amplitudes for speech versus limb at a frontocentral location following cathodal HD\u2010tDCS. Moreover, results showed stronger activation in cingulate cortex and rDLPFC for speech versus limb No\u2010Go following cathodal HD\u2010tDCS. These results indicate (1) P3 is an ERP marker of amodal inhibitory mechanisms that support both speech and limb inhibition, (2) larger P3 for speech versus limb No\u2010Go following cathodal HD\u2010tDCS may reflect the recruitment of additional neural resources\u2014particularly within rDLPFC and cingulate cortex\u2014as compensatory mechanisms to counteract the temporary stimulation\u2010induced decline in speech inhibitory process. These findings have translational implications for neurological conditions that concurrently affect speech and limb movement.<\/jats:p>","DOI":"10.1111\/psyp.14289","type":"journal-article","created":{"date-parts":[[2023,3,8]],"date-time":"2023-03-08T08:09:58Z","timestamp":1678262998000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["High\u2010definition transcranial direct current stimulation over right dorsolateral prefrontal cortex differentially modulates inhibitory mechanisms for speech vs. limb movement"],"prefix":"10.1111","volume":"60","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0295-7397","authenticated-orcid":false,"given":"Karim","family":"Johari","sequence":"first","affiliation":[{"name":"Human Neurophysiology and Neuromodulation Laboratory, Department of Communication Sciences and Disorders Louisiana State University  Baton Rouge Louisiana 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