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Eye-hand coordination during a double-step task: evidence for a common stochastic accumulator
1National Brain Research Centre, Manesar, Haryana, India; and.
Journal of Neurophysiology
|June 19, 2015
Summary
Researchers investigated eye-hand coordination, testing three models. The common command model best explained the data, suggesting a dedicated system for planning coordinated eye and hand movements.
Area of Science:
- Neuroscience
- Motor Control
- Cognitive Science
Background:
- Eye and hand movements exhibit strong spatial and temporal correlations.
- Existing models include independent, interactive, and common command architectures for eye-hand coordination.
Purpose of the Study:
- To distinguish between independent, interactive, and common command models of eye-hand coordination.
- To investigate the underlying neural mechanisms of coordinated gaze and pointing.
Main Methods:
- Utilized a double-step task to decouple eye and hand movements.
- Employed a drift-diffusion framework within a race model to analyze redirect behavior.
- Collected and analyzed reaction time (RT) data for eye and hand movements.
Main Results:
- The common command architecture provided the best explanation for observed eye-hand response patterns.
- Eye and hand movement reaction time variances were comparable, despite differences in mean RTs.
- Changes in eye movement RTs similarly affected hand movement RTs' mean and variance.
Conclusions:
- Data strongly suggest a dedicated neural circuit for coordinated eye-hand planning.
- Supports the common command model over independent or interactive models.
- Highlights the role of a common stochastic accumulator in eye-hand coordination.
