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Spatial compression impairs prism adaptation in healthy individuals

Scriven, Rachel J.; Newport, Roger

Authors

Rachel J. Scriven

Roger Newport



Abstract

Neglect patients typically present with gross inattention to one side of space following damage to the contralateral hemisphere. While prism-adaptation (PA) is effective in ameliorating some neglect behaviors, the mechanisms involved and their relationship to neglect remain unclear. Recent studies have shown that conscious strategic control (SC) processes in PA may be impaired in neglect patients, who are also reported to show extraordinarily long aftereffects compared to healthy participants. Determining the underlying cause of these effects may be the key to understanding therapeutic benefits. Alternative accounts suggest that reduced SC might result from a failure to detect prism-induced reaching errors properly either because (a) the size of the error is underestimated in compressed visual space or (b) pathologically increased error-detection thresholds reduce the requirement for error correction. The purpose of this study was to model these two alternatives in healthy participants and to examine whether SC and subsequent aftereffects were abnormal compared to standard PA. Each participant completed three PA procedures within a MIRAGE mediated reality environment with direction errors recorded before, during and after adaptation. During PA, visual feedback of the reach could be compressed, perturbed by noise, or represented veridically. Compressed visual space significantly reduced SC and aftereffects compared to control and noise conditions. These results support recent observations in neglect patients, suggesting that a distortion of spatial representation may successfully model neglect and explain neglect performance while adapting to prisms.

Citation

Scriven, R. J., & Newport, R. (2013). Spatial compression impairs prism adaptation in healthy individuals. Frontiers in Human Neuroscience, 7, doi:10.3389/fnhum.2013.00165

Journal Article Type Article
Publication Date May 7, 2013
Deposit Date Mar 31, 2014
Publicly Available Date Mar 31, 2014
Journal Frontiers in Human Neuroscience
Electronic ISSN 1662-5161
Publisher Frontiers Media
Peer Reviewed Peer Reviewed
Volume 7
Article Number 165
DOI https://doi.org/10.3389/fnhum.2013.00165
Public URL http://eprints.nottingham.ac.uk/id/eprint/2769
Publisher URL http://journal.frontiersin.org/Journal/10.3389/fnhum.2013.00165/abstrac
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0
Additional Information This Document is Protected by copyright and was first published by Frontiers. All rights reserved. It is reproduced with permission

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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