A Brief Exposure to Leftward Prismatic Adaptation Enhances the Representation of the Ipsilateral, Right Visual Field in the Right Inferior Parietal Lobule.
Details
State: Public
Version: Final published version
Serval ID
serval:BIB_AFB3A5CC2392
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
A Brief Exposure to Leftward Prismatic Adaptation Enhances the Representation of the Ipsilateral, Right Visual Field in the Right Inferior Parietal Lobule.
Journal
eNeuro
ISSN
2373-2822 (Electronic)
ISSN-L
2373-2822
Publication state
Published
Issued date
2017
Peer-reviewed
Oui
Volume
4
Number
5
Pages
1-2
Language
english
Notes
Publication types: Journal Article
Publication Status: epublish
Publication Status: epublish
Abstract
A brief exposure to rightward prismatic adaptation (PA) was shown to shift visual field representation within the inferior parietal lobule (IPL) from the right to the left hemisphere. This change in hemispheric dominance could be interpreted as (1) a general effect of discrepancy in visuomotor alignment caused by PA or (2) a direction-specific effect of rightward PA. To test these hypotheses, we compared the effects of rightward and leftward PA on visual representation in normal human subjects. Three groups of normal subjects underwent an fMRI evaluation using a simple visual detection task before and after brief PA exposure using leftward- or rightward-deviating prisms or no prisms (L-PA, R-PA, neutral groups). A two-way ANOVA group × session revealed a significant interaction suggesting that PA-induced modulation is direction specific. <i>Post hoc</i> analysis showed that L-PA enhanced the representation of the right visual field within the right IPL. Thus, a brief exposure to L-PA enhanced right hemispheric dominance within the ventral attentional system, which is the opposite effect of the previously described shift in hemispheric dominance following R-PA. The direction-specific effects suggest that the underlying neural mechanisms involve the fine-tuning of specific visuomotor networks. The enhancement of right hemispheric dominance following L-PA offers a parsimonious explanation for neglect-like symptoms described previously in normal subjects.
Keywords
Adaptation, Physiological/physiology, Adult, Analysis of Variance, Attention/physiology, Female, Functional Laterality/physiology, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Imaging, Male, Oxygen/blood, Parietal Lobe/diagnostic imaging, Parietal Lobe/physiology, Photic Stimulation, Space Perception/physiology, Visual Fields/physiology, Young Adult, fMRI, inferior parietal lobule, prismatic adaptation, visual field
Pubmed
Web of science
Open Access
Yes
Create date
12/10/2017 10:23
Last modification date
20/08/2019 16:19