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Updated: Jul 3, 2026
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Cross-Modal Multivariate Pattern Analysis
Published on: November 9, 2011
Auditory projections to extrastriate visual cortex: connectional basis for multisensory processing in 'unimodal'
H Ruth Clemo1, Giriraj K Sharma, Brian L Allman
1Department of Anatomy and Neurobiology, Virginia Commonwealth University School of Medicine, Richmond, VA 23298-0709, USA. rclemo@vcu.edu
Experimental Brain Research
|July 24, 2008
Summary
This study reveals auditory input to the cat posterolateral lateral suprasylvian (PLLS) cortex, enhancing visual motion processing. Specific auditory areas project to distinct PLLS regions, supporting bimodal and subthreshold multisensory integration.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Visual Neuroscience
Background:
- The posterolateral lateral suprasylvian (PLLS) cortex in cats, traditionally viewed as unimodal visual, shows emerging evidence of multisensory integration.
- Distinct regions within the PLLS exhibit bimodal responses or subthreshold facilitation from auditory stimuli, suggesting complex crossmodal processing.
Purpose of the Study:
- To investigate the corticocortical connectivity underlying multisensory convergence in the PLLS.
- To identify the specific auditory cortical areas projecting to the bimodal and subthreshold multisensory regions of the PLLS.
- To elucidate the neural substrates for different forms of crossmodal processing in the PLLS.
Main Methods:
- Utilized biotinylated dextran amine (BDA) tracer methods in 21 adult cats.
- Examined projections from various auditory cortical areas, including AAF, AI, DZ, AII, FRS, FAES, and PAF.
- Mapped the origins of projections to identified bimodal and subthreshold multisensory zones within the PLLS.
Main Results:
- The dorsal zone (DZ), primary auditory cortex (AI), secondary auditory cortex (AII), and the field anterior ectosylvian sulcus (FAES) were found to project to both the bimodal and subthreshold regions of the PLLS.
- Demonstrated specific auditory cortical pathways converging onto the PLLS.
- Established a link between auditory input and distinct multisensory processing mechanisms within the PLLS.
Conclusions:
- Auditory information accesses the PLLS, contributing to its role in visual motion processing.
- The identified corticocortical connections provide the neural basis for bimodal and subthreshold multisensory integration in the PLLS.
- These findings highlight the complex multisensory nature of the PLLS and its functional implications for visual processing.
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