AI Article Synopsis
- The brain combines different types of sensory information to understand the environment and respond appropriately.
- The study focused on how visual stimuli of varying frequencies and intensities affect auditory responses in the inferior colliculus (IC) of rats using functional MRI (fMRI).
- Results showed that only low-frequency, high-intensity visual stimuli suppressed auditory responses in the IC, indicating that cross-modal processing depends on the characteristics of the stimuli and may involve feedback from non-visual brain areas.
Article Abstract
The brain integrates information from different sensory modalities to form a representation of the environment and facilitate behavioral responses. The auditory midbrain or inferior colliculus (IC) is a pivotal station in the auditory system, integrating ascending and descending information from various auditory sources and cortical systems. The present study investigated the modulation of auditory responses in the IC by visual stimuli of different frequencies and intensities in rats using functional MRI (fMRI). Low-frequency (1 Hz) high-intensity visual stimulus suppressed IC auditory responses. However, high-frequency (10 Hz) or low-intensity visual stimuli did not alter the IC auditory responses. This finding demonstrates that cross-modal processing occurs in the IC in a manner that depends on the stimulus. Furthermore, only low-frequency high-intensity visual stimulus elicited responses in non-visual cortical regions, suggesting that the above cross-modal modulation effect may arise from top-down cortical feedback. These fMRI results provide insight to guide future studies of cross-modal processing in sensory pathways.
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| http://dx.doi.org/10.1109/EMBC.2018.8513629 | DOI Listing |
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