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Sensory substitution information informs locomotor adjustments when walking through apertures

Authors
  • Kolarik, Andrew J.1, 2
  • Timmis, Matthew A.2, 3
  • Cirstea, Silvia2, 4
  • Pardhan, Shahina2
  • 1 University of Cambridge, Department of Psychology, Downing Street, Cambridge, CB2 3EB, UK , Cambridge (United Kingdom)
  • 2 Anglia Ruskin University, Vision and Eye Research Unit (VERU), Postgraduate Medical Institute, Eastings 204, East Road, Cambridge, CB1 1PT, UK , Cambridge (United Kingdom)
  • 3 Anglia Ruskin University, Sport and Exercise Sciences Research Group, Life Sciences, East Road, Cambridge, CB1 1PT, UK , Cambridge (United Kingdom)
  • 4 Anglia Ruskin University, Department of Computing and Technology, East Road, Cambridge, CB1 1PT, UK , Cambridge (United Kingdom)
Type
Published Article
Journal
Experimental Brain Research
Publisher
Springer-Verlag
Publication Date
Dec 27, 2013
Volume
232
Issue
3
Pages
975–984
Identifiers
DOI: 10.1007/s00221-013-3809-5
Source
Springer Nature
Keywords
License
Yellow

Abstract

The study assessed the ability of the central nervous system (CNS) to use echoic information from sensory substitution devices (SSDs) to rotate the shoulders and safely pass through apertures of different width. Ten visually normal participants performed this task with full vision, or blindfolded using an SSD to obtain information regarding the width of an aperture created by two parallel panels. Two SSDs were tested. Participants passed through apertures of +0, +18, +35 and +70 % of measured body width. Kinematic indices recorded movement time, shoulder rotation, average walking velocity across the trial, peak walking velocities before crossing, after crossing and throughout a whole trial. Analyses showed participants used SSD information to regulate shoulder rotation, with greater rotation associated with narrower apertures. Rotations made using an SSD were greater compared to vision, movement times were longer, average walking velocity lower and peak velocities before crossing, after crossing and throughout the whole trial were smaller, suggesting greater caution. Collisions sometimes occurred using an SSD but not using vision, indicating that substituted information did not always result in accurate shoulder rotation judgements. No differences were found between the two SSDs. The data suggest that spatial information, provided by sensory substitution, allows the relative position of aperture panels to be internally represented, enabling the CNS to modify shoulder rotation according to aperture width. Increased buffer space indicated by greater rotations (up to approximately 35 % for apertures of +18 % of body width) suggests that spatial representations are not as accurate as offered by full vision.

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