High level of dexterity: differential contributions of frontal and parietal areas

Cécile Galléa (1) , Jozina B de Graaf (1) , Mireille Bonnard Bonnard (1) , Jean Pailhous (1)

1 INCM - Institut de neurosciences cognitives de la méditerranée - UMR 6193

In the present functional magnetic resonance imaging experiment, study participants performed a dynamic tracking task in a precision grip con¢guration. The precision level of the force control was varied while the mean force level of 5 N was kept constant. Contrasts cancelling error rate di¡erences between the conditions showed activation of nonprimary motor areas and other frontal structures in response to increasing precision constraints when the precision of force control could still be increased, and of right primary and associative parietal areas when the precision of the produced force control reached its maximum. These results suggest that the network of frontal and parietal areas, usually working together in ¢ne control of dexterity tasks, can be di¡erentially involved when environmental constraints become very high. NeuroReport16:1271^1274

Mots clés: Functional magnetic resonance imaging; Dynamic force control; Nonprimary motor areas; Precision grip; Primary motor cortex

Domaines: Neurobiologie

Cécile Galléa, Jozina B de Graaf, Mireille Bonnard Bonnard, Jean Pailhous. High level of dexterity: differential contributions of frontal and parietal areas. NeuroReport, 2005, 16, pp.1271-1274. ⟨hal-01454684⟩