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Why do we do what we do with our hands?| old_uid | 4481 |
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| title | Why do we do what we do with our hands? |
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| start_date | 2008/03/31 |
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| schedule | 16h15 |
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| online | no |
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| summary | Human reach-to-grasp movements alter lawfully as a function of an object's physical dimensions, its location and orientation. But what makes us grasp a particular object in a particular way? When we see an object in the world, there may be a large number of different ways to interact with that object. This large 'visuomotor space' can be constrained through affordances (perceptually available object properties defining potential uses), task demands and the actor's intentions. The effects of perceptual biases can be modified by performance factors, such as a limb's end-state-comfort (ESC, Rosenbaum et al. 1990).
We have explored how two other potential performance biases affect interaction with a perceptually under-constrained object: hysteresis (H) and minimal forearm rotation (MR).
Our experiments have shown that in addition to (ESC), (H) and (MR) influence prehension behaviour in adult participants. We have also found that: (i) the influence of these different performance biases alters over the developmental trajectory; (ii) children with neurodevelopmental disorder are biased in different ways from age matched controls.
These results will be used to argue for a separation between 'motor' and 'executive' planning'. I will suggest that: (a) motor planning is a dynamic process of selecting actions from an extant repertoire that exists through a process of natural selection; (b) executive planning reflects abstract evaluations of possible future outcomes; (c) movement planning can be used to describe the normal synergistic relationship between motor and executive planning. This interpretation will be related to processes of sensorimotor learning and be used to justify the robotic intervention we are currently trialing in children with neurodevelopmental disorder. |
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| responsibles | van Vreeswijk, Hansel |
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