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Motor theory modulated by task load: behavioural effects of tDCS over the LSTG on phonological processing

ABSTRACT Previously we claimed that motoric participation in phonological processing is modulated by task nature, with tDCS responses showing the LIFG increasingly relevant from perception to production. Here we investigated if the claim for a changing and complementary interplay between the LIFG and the LSTG across the speech perception to speech production range holds. We sought the reversed pattern of behavioural responses while targeting the LSTG, considered decreasingly relevant across the range. The same speech perception and production tasks from our previous studies were administered during either anodal, cathodal or sham stimulation. A-tDCS facilitation and C-tDCS inhibition should decrease from perception to production, while facilitatory compensation of C-tDCS downregulation should increase. Overall, the expected reversed pattern was observed with the LSTG as target. For example, downregulation of the LSTG during word naming, considered of low relevance for the LSTG and of higher relevance for the LIFG, caused facilitation, suggesting compensation.