Directional Visual Motion Is Represented in the Auditory and Association Cortices of Early Deaf Individuals.

RETTER, Talia; Webster, Michael A; Jiang, Fang

doi:10.1162/jocn_a_01378

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Directional Visual Motion Is Represented in the Auditory and Association Cortices of Early Deaf Individuals.

RETTER, Talia; Webster, Michael A; Jiang, Fang

2019 • In Journal of Cognitive Neuroscience, 31 (8), p. 1126 - 1140

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https://hdl.handle.net/10993/58592

DOI
10.1162/jocn_a_01378

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30726181

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Abstract :

[en] Individuals who are deaf since early life may show enhanced performance at some visual tasks, including discrimination of directional motion. The neural substrates of such behavioral enhancements remain difficult to identify in humans, although neural plasticity has been shown for early deaf people in the auditory and association cortices, including the primary auditory cortex (PAC) and STS region, respectively. Here, we investigated whether neural responses in auditory and association cortices of early deaf individuals are reorganized to be sensitive to directional visual motion. To capture direction-selective responses, we recorded fMRI responses frequency-tagged to the 0.1-Hz presentation of central directional (100% coherent random dot) motion persisting for 2 sec contrasted with nondirectional (0% coherent) motion for 8 sec. We found direction-selective responses in the STS region in both deaf and hearing participants, but the extent of activation in the right STS region was 5.5 times larger for deaf participants. Minimal but significant direction-selective responses were also found in the PAC of deaf participants, both at the group level and in five of six individuals. In response to stimuli presented separately in the right and left visual fields, the relative activation across the right and left hemispheres was similar in both the PAC and STS region of deaf participants. Notably, the enhanced right-hemisphere activation could support the right visual field advantage reported previously in behavioral studies. Taken together, these results show that the reorganized auditory cortices of early deaf individuals are sensitive to directional motion. Speculatively, these results suggest that auditory and association regions can be remapped to support enhanced visual performance.

Disciplines :

Neurosciences & behavior

Author, co-author :

RETTER, Talia ; University of Nevada, Reno ; University of Louvain

Webster, Michael A; University of Nevada, Reno

Jiang, Fang; University of Nevada, Reno

External co-authors :

yes

Language :

English

Title :

Directional Visual Motion Is Represented in the Auditory and Association Cortices of Early Deaf Individuals.

Publication date :

August 2019

Journal title :

Journal of Cognitive Neuroscience

ISSN :

0898-929X

eISSN :

1530-8898

Publisher :

MIT Press Journals, United States

Volume :

Issue :

Pages :

1126 - 1140

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.mitpressjournals.org/doi/pdf/10.1162/jocn_a_01378

Funding text :

This research was supported by grants from the National Institutes of Health (NIH; grants EY023268 to F. J. and P20 GM103650 to M. A. W.). The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH. Talia L. Retter is supported by the Belgian National Foundation for Scientific Research (grant FC7159). The authors are thankful to Andrea Conte and Bruno Rossion for access to the stimulation program XPMan, Revision 111, as well as to Xiaoqing Gao for his help with the frequency domain analysis, and O. Scott Gwinn for use of his behavioral data on discrimination thresholds for the deaf participants as well as help with stimulus generation.

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