Human parietal and primary motor cortical interactions are selectively modulated during the transport and grip formation of goal-directed hand actions

► Selective parietomotor circuits for transport and grip formation in goal-directed hand actions in humans. ► SPOC-M1 interactions are selectively facilitated during planning of arm transport(independent of grip). ► aIPS exerts grip-specific facilitation of ipsilateral M1 even in the absence of transport.