Opposite effects of lateralised transcranial alpha versus gamma stimulation on auditory spatial attention
Background: Spatial attention relatively increases the power of neural 10-Hz alpha oscillations in the hemisphere ipsilateral to attention, and decreases alpha power in the contralateral hemisphere. For gamma oscillations (>40 Hz), the opposite effect has been observed. The functional roles of la...
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doaj-9505651d59904c3a8f004031b2115c732021-03-19T07:12:00ZengElsevierBrain Stimulation1935-861X2018-07-01114752758Opposite effects of lateralised transcranial alpha versus gamma stimulation on auditory spatial attentionMalte Wöstmann0Johannes Vosskuhl1Jonas Obleser2Christoph S. Herrmann3Department of Psychology, University of Lübeck, Lübeck, Germany; Corresponding author. Department of Psychology, University of Lübeck, Maria-Goeppert Straße 9a, 23562, Lübeck, Germany.Experimental Psychology Lab, Center for Excellence “Hearing4all”, European Medical School, University of Oldenburg, Oldenburg, GermanyDepartment of Psychology, University of Lübeck, Lübeck, GermanyExperimental Psychology Lab, Center for Excellence “Hearing4all”, European Medical School, University of Oldenburg, Oldenburg, GermanyBackground: Spatial attention relatively increases the power of neural 10-Hz alpha oscillations in the hemisphere ipsilateral to attention, and decreases alpha power in the contralateral hemisphere. For gamma oscillations (>40 Hz), the opposite effect has been observed. The functional roles of lateralised oscillations for attention are currently unclear. Hypothesis: If lateralised oscillations are functionally relevant for attention, transcranial stimulation of alpha versus gamma oscillations in one hemisphere should differentially modulate the accuracy of spatial attention to the ipsi-versus contralateral side. Methods: 20 human participants performed a dichotic listening task under continuous transcranial alternating current stimulation (tACS, vs sham) at alpha (10 Hz) or gamma (47 Hz) frequency. On each trial, participants attended to four spoken numbers on the left or right ear, while ignoring numbers on the other ear. In order to stimulate a left temporo-parietal cortex region, which is known to show marked modulations of alpha power during auditory spatial attention, tACS (1 mA peak-to-peak amplitude) was applied at electrode positions TP7 and FC5 over the left hemisphere. Results: As predicted, unihemispheric alpha-tACS relatively decreased the recall of targets contralateral to stimulation, but increased recall of ipsilateral targets. Importantly, this spatial pattern of results was reversed for gamma-tACS. Conclusions: Results provide a proof of concept that transcranially stimulated oscillations can enhance spatial attention and facilitate attentional selection of speech. Furthermore, opposite effects of alpha versus gamma stimulation support the view that states of high alpha are incommensurate with active neural processing as reflected by states of high gamma.http://www.sciencedirect.com/science/article/pii/S1935861X18301074Spatial attentionAuditoryTranscranial alternating current stimulationAlphaGammaNeural oscillation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Malte Wöstmann Johannes Vosskuhl Jonas Obleser Christoph S. Herrmann |
spellingShingle |
Malte Wöstmann Johannes Vosskuhl Jonas Obleser Christoph S. Herrmann Opposite effects of lateralised transcranial alpha versus gamma stimulation on auditory spatial attention Brain Stimulation Spatial attention Auditory Transcranial alternating current stimulation Alpha Gamma Neural oscillation |
author_facet |
Malte Wöstmann Johannes Vosskuhl Jonas Obleser Christoph S. Herrmann |
author_sort |
Malte Wöstmann |
title |
Opposite effects of lateralised transcranial alpha versus gamma stimulation on auditory spatial attention |
title_short |
Opposite effects of lateralised transcranial alpha versus gamma stimulation on auditory spatial attention |
title_full |
Opposite effects of lateralised transcranial alpha versus gamma stimulation on auditory spatial attention |
title_fullStr |
Opposite effects of lateralised transcranial alpha versus gamma stimulation on auditory spatial attention |
title_full_unstemmed |
Opposite effects of lateralised transcranial alpha versus gamma stimulation on auditory spatial attention |
title_sort |
opposite effects of lateralised transcranial alpha versus gamma stimulation on auditory spatial attention |
publisher |
Elsevier |
series |
Brain Stimulation |
issn |
1935-861X |
publishDate |
2018-07-01 |
description |
Background: Spatial attention relatively increases the power of neural 10-Hz alpha oscillations in the hemisphere ipsilateral to attention, and decreases alpha power in the contralateral hemisphere. For gamma oscillations (>40 Hz), the opposite effect has been observed. The functional roles of lateralised oscillations for attention are currently unclear. Hypothesis: If lateralised oscillations are functionally relevant for attention, transcranial stimulation of alpha versus gamma oscillations in one hemisphere should differentially modulate the accuracy of spatial attention to the ipsi-versus contralateral side. Methods: 20 human participants performed a dichotic listening task under continuous transcranial alternating current stimulation (tACS, vs sham) at alpha (10 Hz) or gamma (47 Hz) frequency. On each trial, participants attended to four spoken numbers on the left or right ear, while ignoring numbers on the other ear. In order to stimulate a left temporo-parietal cortex region, which is known to show marked modulations of alpha power during auditory spatial attention, tACS (1 mA peak-to-peak amplitude) was applied at electrode positions TP7 and FC5 over the left hemisphere. Results: As predicted, unihemispheric alpha-tACS relatively decreased the recall of targets contralateral to stimulation, but increased recall of ipsilateral targets. Importantly, this spatial pattern of results was reversed for gamma-tACS. Conclusions: Results provide a proof of concept that transcranially stimulated oscillations can enhance spatial attention and facilitate attentional selection of speech. Furthermore, opposite effects of alpha versus gamma stimulation support the view that states of high alpha are incommensurate with active neural processing as reflected by states of high gamma. |
topic |
Spatial attention Auditory Transcranial alternating current stimulation Alpha Gamma Neural oscillation |
url |
http://www.sciencedirect.com/science/article/pii/S1935861X18301074 |
work_keys_str_mv |
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