Selective modulation of interhemispheric connectivity by transcranial alternating current stimulation influences binaural integration
Creators
Date of Archiving
2021Archive
Radboud Data Repository
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Restricted access

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Organization
PI Group Neurobiology of Language
SW OZ DCC SMN
PI Group Affective Neuroscience
SW OZ DCC PL
Audience(s)
Life sciences
Languages used
English
Key words
dichotic listening; fMRI; dynamic causal modeling; speech perception; transcranial alternating current stimulationAbstract
Brain connectivity plays a major role in the encoding, transfer, and integration of sensory information. Interregional synchronization of neural oscillations in the γ-frequency band has been suggested as a key mechanism underlying perceptual integration. In a recent study, we found evidence for this hypothesis showing that the modulation of interhemispheric oscillatory synchrony by means of bihemispheric high-density transcranial alternating current stimulation (HD-TACS) affects binaural integration of dichotic acoustic features. Here, we aimed to establish a direct link between oscillatory synchrony, effective brain connectivity, and binaural integration. We experimentally manipulated oscillatory synchrony (using bihemispheric γ-TACS with different interhemispheric phase lags) and assessed the effect on effective brain connectivity and binaural integration (as measured with functional MRI and a dichotic listening task, respectively). We found that TACS reduced intrahemispheric connectivity within the auditory cortices and antiphase (interhemispheric phase lag 180°) TACS modulated connectivity between the two auditory cortices. Importantly, the changes in intra- and interhemispheric connectivity induced by TACS were correlated with changes in perceptual integration. Our results indicate that γ-band synchronization between the two auditory cortices plays a functional role in binaural integration, supporting the proposed role of interregional oscillatory synchrony in perceptual integration.
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- Datasets [1528]
- Donders Centre for Cognitive Neuroimaging [3762]
- Faculty of Social Sciences [29098]