Publication: Neuromodulation of the left auditory cortex with transcranial direct current stimulation (tDCS) has no effect on the categorical perception of speech sounds
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Işık, Mevlude
Eskikurt, Gökçer
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Abstract
Temporal cue analysis in auditory stimulus is essential in the perception of speech sounds. The effect of trans -cranial direct current stimulation (tDCS) on auditory temporal processing remains unclear. In this study, we examined whether tDCS applied over the left auditory cortex (AC) has a polarity-specific behavioral effect on the categorical perception of speech sounds whose temporal features are modulated. Sixteen healthy volunteers in each group were received anodal, cathodal, or sham tDCS. A phonetic categorization task including auditory stimuli with varying voice onset time was performed before and during tDCS, and responses were analyzed. No statistically significant difference was observed between groups (anode, cathode, sham) and within the groups (pre-tDCS, during tDCS) in comparisons of the slope parameter of the identification function obtained from the phonetic categorization task data. Our results show that a single-session application of tDCS over the left AC does not significantly affect the categorical perception of speech sounds.
Source
Publisher
Elsevier
Subject
Behavioral sciences, Neurosciences, Psychology, Experimental
Citation
Has Part
Source
Neuropsychologia
Book Series Title
Edition
DOI
10.1016/j.neuropsychologia.2022.108442