Multisensory learning between odor and sound enhances beta oscillations

Scientific Reports
A GnaedingerClaire Martin

Abstract

Multisensory interactions are essential to make sense of the environment by transforming the mosaic of sensory inputs received by the organism into a unified perception. Brain rhythms allow coherent processing within areas or between distant brain regions and could thus be instrumental in functionally connecting remote brain areas in the context of multisensory interactions. Still, odor and sound processing relate to two sensory systems with specific anatomofunctional characteristics. How does the brain handle their association? Rats were challenged to discriminate between unisensory stimulation (odor or sound) and the multisensory combination of both. During learning, we observed a progressive establishment of high power beta oscillations (15-35 Hz) spanning on the olfactory bulb, the piriform cortex and the perirhinal cortex, but not the primary auditory cortex. In the piriform cortex, beta oscillations power was higher in the multisensory condition compared to the presentation of the odor alone. Furthermore, in the olfactory structures, the sound alone was able to elicit a beta oscillatory response. These findings emphasize the functional differences between olfactory and auditory cortices and reveal that beta oscillations c...Continue Reading

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Citations

Apr 17, 2020·Neuroscience and Biobehavioral Reviews·Boris GourévitchJos J Eggermont
Oct 15, 2021·Proceedings of the National Academy of Sciences of the United States of America·Behzad IravaniJohan N Lundström

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