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Long-range tactile masking occurs in the postural body schema

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Abstract

Long-range tactile masking has been reported between mirror symmetric body locations. This suggests a general principle of contralateral inhibition between corresponding points on each side of the body that may serve to enhance distinguishing touches on the two halves of the body. Do such effects occur before or after posture is added to the body schema? Here, we address this question by exploring the effect of arm position on long-range tactile masking. The influence of arm position was investigated using different positions of both the test and masking arms. Tactile sensitivity was measured on one forearm, while vibrotactile-masking stimulation was applied to the opposite arm or to a control site on the shoulder. No difference was found in sensitivity when test arm position was varied. Physical contact between the arms significantly increased the effectiveness of a masking stimulus applied to the other arm. Long-range masking between the arms was strongest when the arms were held parallel to each other and was abolished if the position of either the test arm or the masking arm was moved from this position. Modulation of the effectiveness of masking by the position of both the test and masking arms suggests that these effects occur after posture information is added to the body’s representation in the brain.

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Acknowledgments

L.R.H. was supported by the Natural Sciences and Engineering Research Council (NSERC) of Canada. S.D. was partly supported from the NSERC CREATE program and an Ontario Graduate Scholarship.

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Authors and Affiliations

  1. Department of Psychology, Centre for Vision Research, York University, 4700 Keele St, Toronto, ON, M3J 1P3, Canada

    Sarah D’Amour & Laurence R. Harris

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  1. Sarah D’Amour
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  2. Laurence R. Harris
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Correspondence to Sarah D’Amour.

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D’Amour, S., Harris, L.R. Long-range tactile masking occurs in the postural body schema. Exp Brain Res 234, 569–575 (2016). https://doi.org/10.1007/s00221-015-4485-4

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  • DOI: https://doi.org/10.1007/s00221-015-4485-4

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