Abstract:
:Temporal structure is ubiquitous in sensory signals, and the brain has been shown to robustly represent information about temporal structure in the phase of low frequency neural oscillations. In a related construct, the integration of information across the different senses has been proposed to be at least partly due to the phase resetting of these low frequency oscillations. As a consequence, oscillations represent a potential contributor to the encoding of complex multisensory signals with informative temporal structures. Here we investigated these interactions using electroencephalography (EEG). We entrained low frequency (3 Hz) delta oscillations using a repetitive auditory stimulus-broadband amplitude modulated noise. Following entrainment, we presented auditory and audiovisual stimuli at variable delays. We examined whether the power of oscillations at the entrained frequency was dependent on the delay (and thus, potentially, phase) at which subsequent stimulation was delivered, and whether this relationship was different for subsequent multisensory (i.e., audiovisual) stimuli when compared with auditory stimuli alone. Our findings demonstrate that, when the subsequent stimuli are solely auditory, the power of oscillations at the entrained frequency is rhythmically modulated by when the stimulus was delivered. For audiovisual stimuli, however, no such dependency is present, yielding consistent power modulations. These effects indicate that reciprocal oscillatory mechanisms may be involved in the continuous encoding of complex temporally structured multisensory inputs such as speech.
journal_name
Brain Topogrjournal_title
Brain topographyauthors
Simon DM,Wallace MTdoi
10.1007/s10548-017-0560-4subject
Has Abstractpub_date
2017-09-01 00:00:00pages
565-578issue
5eissn
0896-0267issn
1573-6792pii
10.1007/s10548-017-0560-4journal_volume
30pub_type
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