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  A Potential Role of Auditory Induced Modulations in Primary Visual Cortex

Azevedo, F., Ortiz-Rios, M., Li, Q., Logothetis, N., & Keliris, G. (2015). A Potential Role of Auditory Induced Modulations in Primary Visual Cortex. Multisensory Research, 28(3-4), 331-349. doi:10.1163/22134808-00002494.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-4543-E Version Permalink: http://hdl.handle.net/21.11116/0000-0000-B662-4
Genre: Journal Article

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Azevedo, FAC1, Author              
Ortiz-Rios, M1, Author              
Li, Q1, Author              
Logothetis, NK1, Author              
Keliris, GA1, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              

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 Abstract: A biologically relevant event is normally the source of multiple, typically correlated, sensory inputs. To optimize perception of the outer world, our brain combines the independent sensory measurements into a coherent estimate. However, if sensory information is not readily available for every pertinent sense, the brain tries to acquire additional information via covert/overt orienting behaviors or uses internal knowledge to modulate sensory sensitivity based on prior expectations. Cross-modal functional modulation of low-level auditory areas due to visual input has been often described; however, less is known about auditory modulations of primary visual cortex. Here, based on some recent evidence, we propose that an unexpected auditory signal could trigger a reflexive overt orienting response towards its source and concomitantly increase the primary visual cortex sensitivity at the locations where the object is expected to enter the visual field. To this end, we propose that three major functionally specific pathways are employed in parallel. A stream orchestrated by the superior colliculus is responsible for the overt orienting behavior, while direct and indirect (via higher-level areas) projections from A1 to V1 respectively enhance spatiotemporal sensitivity and facilitate object detectability.

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 Dates: 2015-07
 Publication Status: Published in print
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 Identifiers: DOI: 10.1163/22134808-00002494
BibTex Citekey: AzevedoOLLK2015
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Title: Multisensory Research
Source Genre: Journal
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Pages: - Volume / Issue: 28 (3-4) Sequence Number: - Start / End Page: 331 - 349 Identifier: -