Right-hemispheric dominance for visual remapping in humans.
We review evidence showing a right-hemispheric dominance for visuo-spatial processing and representation in humans. Accordingly, visual disorganization symptoms (intuitively related to remapping impairments) are observed in both neglect and constructional apraxia. More specifically, we review findings from the intervening saccade paradigm in humans--and present additional original data--which suggest a specific role of the asymmetrical network at the temporo-parietal junction (TPJ) in the right hemisphere in visual remapping: following damage to the right dorsal posterior parietal cortex (PPC) as well as part of the corpus callosum connecting the PPC to the frontal lobes, patient OK in a double-step saccadic task exhibited an impairment when the second saccade had to be directed rightward. This singular and lateralized deficit cannot result solely from the patient's cortical lesion and, therefore, we propose that it is due to his callosal lesion that may specifically interrupt the interhemispheric transfer of information necessary to execute accurate rightward saccades towards a remapped target location. This suggests a specialized right-hemispheric network for visuo-spatial remapping that subsequently transfers target location information to downstream planning regions, which are symmetrically organized.
INSERM, U864, Espace et Action, 16 avenue Lépine, Bron 69676, France. laure.pisella@inserm.fr
L
L
Pisella
N
N
Alahyane
A
A
Blangero
F
F
Thery
S
S
Blanc
D
D
Pelisson
D000377:Agnosia / Q000503:physiopathology; D000818:Animals; D001072:Apraxias / Q000503:physiopathology; D000882:Haplorhini; D006801:Humans; D010296:Parietal Lobe / Q000502:physiology* / Q000503:physiopathology; D012438:Saccades / Q000502:physiology*; D013028:Space Perception / Q000502:physiology; D014796:Visual Perception / Q000502:physiology*
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