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Experimental Brain Research

, Volume 233, Issue 11, pp 3153–3161 | Cite as

Multisensory distortions of the hand have differential effects on tactile perception

  • A. Treshi-marie Perera
  • Roger Newport
  • Kirsten J. McKenzie
Research Article

Abstract

Research has suggested that altering the perceived shape and size of the body image significantly affects perception of somatic events. The current study investigated how multisensory illusions applied to the body altered tactile perception using the somatic signal detection task. Thirty-one healthy volunteers were asked to report the presence or absence of near-threshold tactile stimuli delivered to the index finger under three multisensory illusion conditions: stretched finger, shrunken finger and detached finger, as well as a veridical baseline condition. Both stretching and shrinking the stimulated finger enhanced correct touch detections; however, the mechanisms underlying this increase were found to be different. In contrast, the detached appearance reduced false touch reports—possibly due to reduced tactile noise, as a result of attention being directed to the tip of the finger only. These findings suggest that distorted representations of the body could have different modulatory effects on attention to touch and provide a link between perceived body representation and somatosensory decision-making.

Keywords

Tactile perception Multisensory illusions MIRAGE Somatic signal detection task Signal detection 

Notes

Acknowledgments

Work on this project by KJM and ATP was supported by an eScience Fund Grant [06-02-12-SF0158] from the Malaysian Ministry of Science, Technology and Innovation.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • A. Treshi-marie Perera
    • 1
  • Roger Newport
    • 2
  • Kirsten J. McKenzie
    • 1
    • 3
  1. 1.School of PsychologyUniversity of Nottingham Malaysia CampusSemenyihMalaysia
  2. 2.School of PsychologyUniversity of Nottingham UK CampusNottinghamUK
  3. 3.School of PsychologyUniversity of LincolnLincolnUK

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