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Construction of an estimate of three-dimensional head motion| old_uid | 7822 |
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| title | Construction of an estimate of three-dimensional head motion |
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| start_date | 2009/12/11 |
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| schedule | 14h30 |
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| online | no |
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| summary | Studies in various fields of neuroscience have come to the hypothesis that many sensory-motor functions are performed by using an internal representation of body motion. In here, we will show how this hypothesis can be applied to the processing of vestibular information about head motion, i.e. that the brain can constructs a threedimensional representation of head motion which matches sensory inputs. After presenting various aspects of vestibular information processing, we focus on a particular point, which is the integration of three-dimensional angular velocity into an estimation of head orientation relative to gravity. The ability to perform this operation is a critical requirement for implementing a three-dimensional model of motion. We demonstrated that the brain has this ability in a recent set of experiments in which the brain is given incomplete information about head angular velocity in space as well as head orientation relative to gravity. We showed that, in such conditions, the brain is always able to reconstruct the real head velocity. We analyse our results in the light of an optimal model based on Bayesian inference, and conclude that the brain can implement and optimally compute an internal representation of motion in threedimensional space. |
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| responsibles | Riehle |
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