The organization of the posterior parietal cortex devoted to upper limb actions: An fMRI study

摘要: The present fMRI study examined whether upper-limb action classes differing in their motor goal are encoded by different PPC sectors. Action observation was used as a proxy for execution. Subjects viewed actors performing object-related (e.g., grasping), skin-displacing rubbing the skin), and interpersonal upper limb actions pushing someone). Observation of three activated three-level network including occipito-temporal, parietal, premotor cortex. parietal region common to observing all located dorsally left intraparietal sulcus (DIPSM/DIPSA border). Regions specific an class were obtained combining interaction between stimulus types with exclusive masking other classes, while regions considered preferentially active exclusively masked observed actions. Left putative human anterior manipulative actions, operculum SII region, Control experiments demonstrated that this latter activation depended on seeing skin being moved not simply touch. Psychophysiological interactions showed two had similar connectivities. Finally, dorsal sector DIPSA, possibly homologue ventral coding impingement target person's body into peripersonal space actor. These results support importance segregation according principle posterior cortex organization implication