A Brief Exposure to Leftward Prismatic Adaptation Enhances the Representation of the Ipsilateral, Right Visual Field in the Right Inferior Parietal Lobule

Autor: Eleonora Fornari, Isabel Tissieres, Stephanie Clarke, Sonia Crottaz-Herbette
Jazyk: angličtina
Rok vydání: 2017
Předmět:
visual field
Adult
Male
medicine.medical_specialty
genetic structures
Audiology
Functional Laterality
050105 experimental psychology
Lateralization of brain function
Developmental psychology
Young Adult
03 medical and health sciences
0302 clinical medicine
Parietal Lobe
Image Processing
Computer-Assisted
medicine
Humans
Attention
0501 psychology and cognitive sciences
Analysis of Variance
inferior parietal lobule
prismatic adaptation
Right inferior parietal lobule
General Neuroscience
fMRI
05 social sciences
Inferior parietal lobule
General Medicine
New Research
Adaptation
Physiological
Magnetic Resonance Imaging
1.1
Visual field
Oxygen
Visual detection
Cognition and Behavior
Right visual field
Space Perception
Female
Analysis of variance
Visual Fields
Adaptation
Physiological/physiology
Attention/physiology
Functional Laterality/physiology
Oxygen/blood
Parietal Lobe/diagnostic imaging
Parietal Lobe/physiology
Photic Stimulation
Space Perception/physiology
Visual Fields/physiology
Psychology
030217 neurology & neurosurgery
Zdroj: eNeuro, vol. 4, no. 5, pp. 1-2
eNeuro
Popis: 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.Post hocanalysis 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.
Databáze: OpenAIRE
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