Presentation Information
[P3-05]Two topological axes for temporo-spatial processing in visuomotor control
*Christian A. Kell1, Christina Nissen1 (1. Goethe University (Germany))
Keywords:
visuomotor timing,visuospatial processing,interhemispheric interactions,hemispheric specialization
In visuomotor control, the right hemisphere has been associated with visuospatial, and the left hemisphere with visuotemporal processing. In right-handed people, asymmetric bimanual tasks result in a preferred use of the left hand for spatial processing and of the right hand for temporal processing. It is unclear, how the two specialized cerebral hemispheres interact with each other when task to hand arrangements respect or do not respect hemispheric processing preferences.
We thus investigated interhemispheric interactions in the cortical visuomotor network in right-handed participants during asymmetric bimanual isometric movements, using magnetoencephalography. The task involved spatially and temporally challenging visuomotor tracking with one hand and a precisely timed ballistic grip without spatial control demands with the other creating a dual task scenario with either an optimal or a non-optimal task to hand assignment.
When the right hand performed the ballistic grip while the left hand performed visuomotor tracking (optimal condition), preparatory interhemispheric broadband partial directed coherence from left premotor areas to right visuomotor regions were stronger compared to the non-optimal condition. In contrast, the non-optimal condition showed stronger preparatory interhemispheric connectivity from right inferior parietal cortex to the left hemispheric visuomotor network.
Our results indicate that the dual task problem is solved by cooperative interactions between specialized cerebral hemispheres with, both, a left-right and a rostro-caudal gradient for temporo-spatial processing.
We thus investigated interhemispheric interactions in the cortical visuomotor network in right-handed participants during asymmetric bimanual isometric movements, using magnetoencephalography. The task involved spatially and temporally challenging visuomotor tracking with one hand and a precisely timed ballistic grip without spatial control demands with the other creating a dual task scenario with either an optimal or a non-optimal task to hand assignment.
When the right hand performed the ballistic grip while the left hand performed visuomotor tracking (optimal condition), preparatory interhemispheric broadband partial directed coherence from left premotor areas to right visuomotor regions were stronger compared to the non-optimal condition. In contrast, the non-optimal condition showed stronger preparatory interhemispheric connectivity from right inferior parietal cortex to the left hemispheric visuomotor network.
Our results indicate that the dual task problem is solved by cooperative interactions between specialized cerebral hemispheres with, both, a left-right and a rostro-caudal gradient for temporo-spatial processing.