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A common stochastic accumulator with effector-dependent noise can explain eye-hand coordination

Gopal, Atul and Viswanathan, Pooja and Murthy, Aditya (2015) A common stochastic accumulator with effector-dependent noise can explain eye-hand coordination. In: JOURNAL OF NEUROPHYSIOLOGY, 113 (7). pp. 2033-2048.

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Official URL: http://dx.doi.org/ 10.1152/jn.00802.2014


The computational architecture that enables the flexible coupling between otherwise independent eye and hand effector systems is not understood. By using a drift diffusion framework, in which variability of the reaction time (RT) distribution scales with mean RT, we tested the ability of a common stochastic accumulator to explain eye-hand coordination. Using a combination of behavior, computational modeling and electromyography, we show how a single stochastic accumulator to threshold, followed by noisy effector-dependent delays, explains eye-hand RT distributions and their correlation, while an alternate independent, interactive eye and hand accumulator model does not. Interestingly, the common accumulator model did not explain the RT distributions of the same subjects when they made eye and hand movements in isolation. Taken together, these data suggest that a dedicated circuit underlies coordinated eye-hand planning.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER PHYSIOLOGICAL SOC, 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA
Keywords: drift diffusion; reaction time; variability; electromyography; motor preparation; eye-hand coordination
Department/Centre: Division of Biological Sciences > Centre for Neuroscience
Date Deposited: 26 Jun 2015 08:05
Last Modified: 26 Jun 2015 08:05
URI: http://eprints.iisc.ac.in/id/eprint/51785

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