Visual Stimuli Modulate Local Field Potentials But Drive No High-Frequency Activity in Human Auditory Cortex

Neuroimaging studies suggest cross-sensory visual influences in human auditory cortices (ACs). Whether these influences reflect active visual processing in human ACs, which drives neuronal firing and concurrent broadband high-frequency activity (BHFA; >70 Hz), or whether they merely modulate soun...

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Bibliographic Details
Published in:The Journal of neuroscience 2024-02, Vol.44 (7), p.JN-RM-0890-23
Main Authors: Ahveninen, Jyrki, Lee, Hsin-Ju, Yu, Hsiang-Yu, Lee, Cheng-Chia, Chou, Chien-Chen, Ahlfors, Seppo P, Kuo, Wen-Jui, Jääskeläinen, Iiro P, Lin, Fa-Hsuan
Format: Article
Language:English
Subjects:
Acoustic Stimulation - methods
Auditory Cortex - physiology
Auditory Perception - physiology
Auditory stimuli
Broadband
Cortex (auditory)
Cortex (somatosensory)
Electroencephalography - methods
Event-related potentials
Evoked Potentials - physiology
Female
Hearing
Humans
Information processing
Male
Medical imaging
Neuroimaging
Oscillations
Photic Stimulation
Sensory integration
Sound processing
Synchronization
Visual fields
Visual Perception - physiology
Visual stimuli
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Summary:Neuroimaging studies suggest cross-sensory visual influences in human auditory cortices (ACs). Whether these influences reflect active visual processing in human ACs, which drives neuronal firing and concurrent broadband high-frequency activity (BHFA; >70 Hz), or whether they merely modulate sound processing is still debatable. Here, we presented auditory, visual, and audiovisual stimuli to 16 participants (7 women, 9 men) with stereo-EEG depth electrodes implanted near ACs for presurgical monitoring. Anatomically normalized group analyses were facilitated by inverse modeling of intracranial source currents. Analyses of intracranial event-related potentials (iERPs) suggested cross-sensory responses to visual stimuli in ACs, which lagged the earliest auditory responses by several tens of milliseconds. Visual stimuli also modulated the phase of intrinsic low-frequency oscillations and triggered 15-30 Hz event-related desynchronization in ACs. However, BHFA, a putative correlate of neuronal firing, was not significantly increased in ACs after visual stimuli, not even when they coincided with auditory stimuli. Intracranial recordings demonstrate cross-sensory modulations, but no indication of active visual processing in human ACs.
ISSN:0270-6474
1529-2401
1529-2401
DOI:10.1523/JNEUROSCI.0890-23.2023