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Integration of vestibular and proprioceptive signals for spatial updating

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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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Notes

  1. Here we assume that most of the inputs provided during passive self-motion in the current context are largely attributable to the vestibular system. However, this is not to say that other somatosensory information from the skin during accelerations, vibrations, and wind could not play a role in self-motion perception (although several of these cues were intentionally limited in the current study).

  2. Note that despite the fact that the term “unisensory” may not be completely appropriate in this context, we will nonetheless use this terminology throughout the paper for simplicity.

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Acknowledgments

The first two authors contributed equally to this work. We thank Michael Weyel for technical assistance and Dr John Butler for valuable advice on the data analysis. We also thank Dr Jack Loomis for earlier valuable discussions and insights. We gratefully acknowledge the work done by the mechanical and electrical workshops of the Max Planck Institute for Biological Cybernetics in adapting the CTM and making it operational. This work was funded by the European 6th Framework Programme CyberWalk (FP6-511092). The writing of this paper by the first author was partially supported by a NSERC grant attributed to Catherine Guastavino (McGill University).

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Correspondence to Ilja Frissen or Jennifer L. Campos.

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Frissen, I., Campos, J.L., Souman, J.L. et al. Integration of vestibular and proprioceptive signals for spatial updating. Exp Brain Res 212, 163–176 (2011). https://doi.org/10.1007/s00221-011-2717-9

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