Abstract：
BACKGROUND:Non-invasive brain stimulation with transcranial alternating currents (tACS) has been shown to entrain slow cortical oscillations and thereby influence various aspects of visual perception. Much less is known about its potential effects on auditory perception. OBJECTIVE:In the present study, we apply a novel variant that enables near-equivalent stimulation of both auditory cortices to investigate the causal role of the phase of 4-Hz cortical oscillations for auditory perception. METHODS:We measured detection performance for near-threshold auditory stimuli (4-Hz click trains) that were presented at various moments during ongoing tACS (two synchronous 4-Hz alternating currents applied transcranially to the two cerebral hemispheres). RESULTS:We found that changes in the relative timing of acoustic and electric stimulation cause corresponding perceptual changes that oscillate predominantly at the 4-Hz frequency of the electric stimulation, which is consistent with previous results based on 10-Hz tACS. CONCLUSION:TACS at various frequencies can affect auditory perception. Together with converging previous results based on acoustic stimulation (rather than tACS), this finding implies that fundamental aspects of auditory cognition are mediated by the temporal coherence of sound-induced cortical activity with ongoing cortical oscillations at multiple time scales.
journal_name
Brain Stimuljournal_title
Brain stimulationauthors
Riecke L,Formisano E,Herrmann CS,Sack ATdoi
10.1016/j.brs.2015.04.004subject
Has Abstractpub_date
2015-07-01 00:00:00pages
777-83issue
4eissn
1935-861Xissn
1876-4754pii
S1935-861X(15)00928-6journal_volume
8pub_type
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