Bihemispheric anodal transcranial direct-current stimulation over temporal cortex enhances auditory selective spatial attention
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The capacity to selectively focus on a particular speaker of interest in a complex acoustic environment with multiple persons speaking simultaneously—a so-called “cocktail-party” situation—is of decisive importance for human verbal communication. Here, the efficacy of single-dose transcranial direct-current stimulation (tDCS) in improving this ability was tested in young healthy adults (n = 24), using a spatial task that required the localization of a target word in a simulated “cocktail-party” situation. In a sham-controlled crossover design, offline bihemispheric double-monopolar anodal tDCS was applied for 30 min at 1 mA over auditory regions of temporal lobe, and the participant’s performance was assessed prior to tDCS, immediately after tDCS, and 1 h after tDCS. A significant increase in the amount of correct localizations by on average 3.7 percentage points (d = 1.04) was found after active, relative to sham, tDCS, with only insignificant reduction of the effect within 1 h after tDCS offset. Thus, the method of bihemispheric tDCS could be a promising tool for enhancement of human auditory attentional functions that are relevant for spatial orientation and communication in everyday life.
KeywordsSound localization Cocktail-party effect Selective spatial attention Auditory segregation Bihemispheric transcranial direct-current stimulation
The author wishes to thank Anna Aust and Emily Eckhardt for data collection, Alina Shamayeva and Michael-Christian Schlüter for help in running the experiments, and Peter Dillmann for preparing the software and parts of the electronic equipment. This work was supported by the German Federal Ministry of Education and Research in the framework of the TRAIN-STIM project (Grant number 01GQ1424E).
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Conflict of interest
The author declares that he has no conflict of interest.
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