Integration of vestibular and proprioceptive signals for spatial updating |
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Authors: | Frissen Ilja Campos Jennifer L Souman Jan L Ernst Marc O |
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Institution: | (1) Institut de Recherche en Communication et Cybern?tique de Nantes (IRCCyN), UMR CNRS 6597, 1, rue de la No?, B. P. 92101, 44321 Nantes Cedex 03, France;(2) Max Planck Institute for Biological Cybernetics, Multisensory Perception and Action Group, T?bingen, Germany;(3) Max Planck Institute for Biological Cybernetics, Human Perception, Cognition, and Action Group, T?bingen, Germany;(4) Department of Psychology, University of Toronto, Toronto, ON, Canada;(5) Toronto Rehabilitation Institute, 550 University Avenue, Toronto, ON, M5G 2A2, Canada;(6) Department of Cognitive Neuroscience, University of Bielefeld, Bielefeld, Germany |
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Abstract: | Spatial updating during self-motion typically involves the appropriate integration of both visual and non-visual cues, including
vestibular and proprioceptive information. Here, we investigated how human observers combine these two non-visual cues during
full-stride curvilinear walking. To obtain a continuous, real-time estimate of perceived position, observers were asked to
continuously point toward a previously viewed target in the absence of vision. They did so while moving on a large circular
treadmill under various movement conditions. Two conditions were designed to evaluate spatial updating when information was
largely limited to either proprioceptive information (walking in place) or vestibular information (passive movement). A third
condition evaluated updating when both sources of information were available (walking through space) and were either congruent
or in conflict. During both the passive movement condition and while walking through space, the pattern of pointing behavior
demonstrated evidence of accurate egocentric updating. In contrast, when walking in place, perceived self-motion was underestimated
and participants always adjusted the pointer at a constant rate, irrespective of changes in the rate at which the participant
moved relative to the target. The results are discussed in relation to the maximum likelihood estimation model of sensory
integration. They show that when the two cues were congruent, estimates were combined, such that the variance of the adjustments
was generally reduced. Results also suggest that when conflicts were introduced between the vestibular and proprioceptive
cues, spatial updating was based on a weighted average of the two inputs. |
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