Sensorimotor Computations in M1 & 5d During Online Control of Reaching Movement

Brown University, Providence RI

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Abstract

DESCRIPTION (provided by applicant): This career development proposal aims at providing the investigator, Dr. Truccolo, with the required experimental expertise for an independent research career in sensorimotor neurophysiology. Dr. Truccolo's goal is to integrate his background in statistical and computational modeling with active experimental work in neurophysiology to investigate the function of interacting cortical networks. The training program is designed to further the understanding of the role of fronto-parietal sensorimotor loops in the online control of voluntary movements. Specifically, the proposed research will test several experimental predictions of a computational model whose hypotheses are: 1) that primary motor cortex (M1) corrects for visual and mechanical perturbations of reaching movements, based on a motor error computed in parietal cortex (5d); and 2) that when visual feedback about the arm is unavailable, 5d uses a forward model prediction of the hand position, derived from proprioceptive feedback and motor commands received from M1, in order to compute the motor error. Unique intracortical recording technology using two 10X10 electrode-arrays will record the activities of cell ensembles and local field potentials (LFPs) in M1 and 5d as monkeys correct for transient visual and mechanical perturbations of reaching movements. A 2-link robot arm will be employed to deliver mechanical perturbations. Statistical methods recently developed by the investigator will be used to test for the existence of predicted sensory, motor and error signals as well as for predicted interactions between M1 and 5d during corrective movements. The training program will be conducted under the mentorship of Dr. Donoghue in the Department of Neuroscience at Brown University. The mentor and the environment are ideally suited: Brown is a well-known center for neuro-technology and systems neuroscience, and Dr. Donoghue is a leading expert in sensorimotor systems, multielectrode neurophysiology, and neural prostheses. In addition to training in experimental neurophysiology, activities will include training in translational neuroscience involving an ongoing clinical trial of cortical neuroprosthetic devices. The proposed program will form the basis for a research career whose long term goals include: 1) shedding new light on the mechanisms underlying movement disorders arising from pathologies of fronto-parietal networks, and 2) the design of cortical neuroprosthetic devices that incorporate sensory feedback in the online closed-loop control of robotic limbs.