Strong rightward lateralization of the dorsal attentional network in left-handers with right sighting-eye: An evolutionary advantage
| Autor: | Marc Joliot, Nathalie Tzourio-Mazoyer, Gaël Jobard, Fabrice Crivello, Emmanuel Mellet, Laure Zago, Laurent Petit, Bernard Mazoyer |
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| Rok vydání: | 2014 |
| Předmět: |
genetic structures
media_common.quotation_subject Population Context (language use) 050105 experimental psychology Lateralization of brain function Ocular dominance 03 medical and health sciences 0302 clinical medicine Perception 0501 psychology and cognitive sciences Radiology Nuclear Medicine and imaging education media_common education.field_of_study Radiological and Ultrasound Technology 05 social sciences Eye movement eye diseases Preference Saccadic masking Neurology Neurology (clinical) Anatomy Psychology 030217 neurology & neurosurgery Cognitive psychology |
| Zdroj: | Human Brain Mapping. 36:1151-1164 |
| ISSN: | 1065-9471 |
| Popis: | Hemispheric lateralization for spatial attention and its relationships with manual preference strength and eye preference were studied in a sample of 293 healthy individuals balanced for manual preference. Functional magnetic resonance imaging was used to map this large sample while performing visually guided saccadic eye movements. This activated a bilateral distributed cortico-subcortical network in which dorsal and ventral attentional/saccadic pathways elicited rightward asymmetrical activation depending on manual preference strength and sighting eye. While the ventral pathway showed a strong rightward asymmetry irrespective of both manual preference strength and eye preference, the dorsal frontoparietal network showed a robust rightward asymmetry in strongly left-handers, even more pronounced in left-handed subjects with a right sighting-eye. Our findings brings support to the hypothesis that the origin of the rightward hemispheric dominance for spatial attention may have a manipulo-spatial origin neither perceptual nor motor per se but rather reflecting a mechanism by which a spatial context is mapped onto the perceptual and motor activities, including the exploration of the spatial environment with eyes and hands. Within this context, strongly left-handers with a right sighting-eye may benefit from the advantage of having the same right hemispheric control of their dominant hand and visuospatial attention processing. We suggest that this phenomenon explains why left-handed right sighting-eye athletes can outperform their competitors in sporting duels and that the prehistoric and historical constancy of the left-handers ratio over the general population may relate in part on the hemispheric specialization of spatial attention. |
| Databáze: | OpenAIRE |
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