A common stochastic accumulator with effector - dependent noise can explain eye – hand
نویسندگان
چکیده
29 The computational architecture that enables the flexible coupling between otherwise 30 independent eye and hand effector systems is not understood. By using a drift diffusion 31 framework, in which variability of the reaction time (RT) distribution scales with mean RT, 32 we tested the ability of a common stochastic accumulator to explain eye-hand coordination. 33 Using a combination of behaviour, computational modelling and electromyography, we show 34 how a single stochastic accumulator to threshold, followed by noisy effector-dependent 35 delays explains eye-hand RT distributions and their correlation, while an alternate 36 independent, interactive eye and hand accumulator model does not. Interestingly, the 37 common accumulator model did not explain the RT distributions of the same subjects when 38 they made eye and hands movements in isolation. Taken together, these data suggest that a 39 dedicated circuit underlies coordinated eye-hand planning. 40
منابع مشابه
A common stochastic accumulator with effector-dependent noise can explain eye-hand coordination.
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, computati...
متن کاملEye-hand coordination during a double-step task: evidence for a common stochastic accumulator.
Many studies of reaching and pointing have shown significant spatial and temporal correlations between eye and hand movements. Nevertheless, it remains unclear whether these correlations are incidental, arising from common inputs (independent model); whether these correlations represent an interaction between otherwise independent eye and hand systems (interactive model); or whether these corre...
متن کاملEvidence of common and separate eye and hand accumulators underlying flexible eye-hand coordination.
Eye and hand movements are initiated by anatomically separate regions in the brain, and yet these movements can be flexibly coupled and decoupled, depending on the need. The computational architecture that enables this flexible coupling of independent effectors is not understood. Here, we studied the computational architecture that enables flexible eye-hand coordination using a drift diffusion ...
متن کاملA common control signal and a ballistic stage can explain the control of coordinated eye-hand movements.
Voluntary control has been extensively studied in the context of eye and hand movements made in isolation, yet little is known about the nature of control during eye-hand coordination. We probed this with a redirect task. Here subjects had to make reaching/pointing movements accompanied by coordinated eye movements but had to change their plans when the target occasionally changed its position ...
متن کاملSpecific Relationship between the Shape of the Readiness Potential, Subjective Decision Time, and Waiting Time Predicted by an Accumulator Model with Temporally Autocorrelated Input Noise
Self-initiated movements are reliably preceded by a gradual buildup of neuronal activity known as the readiness potential (RP). Recent evidence suggests that the RP may reflect subthreshold stochastic fluctuations in neural activity that can be modeled as a process of accumulation to bound. One element of accumulator models that has been largely overlooked in the literature is the stochastic te...
متن کامل