Oscillatory infrasonic modulation of the cochlear amplifier by selective attention
Author
dc.contributor.author
Dragicevic, Constantino
Author
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Marcenaro, Bruno
Author
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Navarrete, Marcela
Author
dc.contributor.author
Robles, Luis
Author
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Délano Reyes, Paul
Admission date
dc.date.accessioned
2019-10-14T15:41:02Z
Available date
dc.date.available
2019-10-14T15:41:02Z
Publication date
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2019
Cita de ítem
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PLoS ONE, Volumen 14, Issue 1, 2019
Identifier
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19326203
Identifier
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10.1371/journal.pone.0208939
Identifier
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https://repositorio.uchile.cl/handle/2250/171518
Abstract
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Evidence shows that selective attention to visual stimuli modulates the gain of cochlear
responses, probably through auditory-cortex descending pathways. At the cerebral cortex
level, amplitude and phase changes of neural oscillations have been proposed as a correlate
of selective attention. However, whether sensory receptors are also influenced by the
oscillatory network during attention tasks remains unknown. Here, we searched for oscillatory
attention-related activity at the cochlear receptor level in humans. We used an alternating
visual/auditory selective attention task and measured electroencephalographic
activity simultaneously to distortion product otoacoustic emissions (a measure of cochlear
receptor-cell activity). In order to search for cochlear oscillatory activity, the otoacoustic
emission signal, was included as an additional channel in the electroencephalogram analyses.
This method allowed us to evaluate dynamic changes in cochlear oscillations within the
same range of frequencies (1–35 Hz) in which cognitive effects are commonly observed in
electroencephalogram works. We found the presence of low frequency (<10 Hz) brain and
cochlear amplifier oscillations during selective attention to visual and auditory stimuli. Notably,
switching between auditory and visual attention modulates the amplitude and the temporal
order of brain and inner ear oscillations. These results extend the role of the oscillatory
activity network during cognition in neural systems to the receptor level.