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To produce appropriate actions in response to complex and dynamic environments, the brain must rapidly generate potential action plans and choose among them, and then translate the selected abstract plan in the extrinsic sensory representation into a complex muscle activation pattern in the intrinsic movement representation.Although neural activity in several distinct functional subareas of the posterior parietal cortex (PPC) has been characterized for a variety of sensory-motor behaviors associated with different body parts, understanding the operation of this complex cortical network at the mechanistic level lags far behind.A full understanding how decision is formed and action goals converted into physical action not only requires an interdisciplinary exploration of information flow and a highly integrative examination of network mechanisms across sensorimotor circuits, but also sophisticated behavioral paradigms able to distinguish two neural processes of general motor intention at the cognitive level and detailed motor preparations at the executive level.I will present some recent neurophysiological studies to elucidate complex neural processes of sensory-motor transformation via the utilization of novel decision making and sequential movement behavioral paradigms.