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The impact of light fingertip touch on haptic cortical processing during a standing balance task

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An Erratum to this article was published on 18 February 2012

Abstract

Availability of fingertip touch onto a stable surface reduces body sway for subjects standing with eyes closed. This is largely associated with sensory feedback from the fingertip when mechanical load is limited. Here, it is possible that the central nervous system facilitates cortical sensory processing to augment feedback to control upright stance. To test this, we compared cortical sensory excitability between tasks with and without light finger touch while standing. Subjects stood in tandem on a force plate with eyes closed while lightly touching a stable surface with the index finger. This was, in two different studies, compared to: (1) no haptic contact or (2) light touch on an object not referenced to balance. Throughout testing, the median nerve was stimulated and electroencephalography was used to measure somatosensory evoked potentials (SEPs). As expected, availability of stable light touch reduced medial–lateral COP sway. Peak amplitudes for SEP components revealed reduced P100 (48%), but increased P50 (31%), N140 (80%), and P200 (20%) during stable touch versus no touch. The modulation of P50 and N140 was no longer present when comparing stable to control (touch), which suggested that attending to touch on either surface, regardless of stability reference, accounted for these changes. Conversely, P200 was increased (19%) when touching the stable surface. Our data show SEP modulation during a standing balance task related to hand contact. Facilitation of P200 in particular may indicate task-specific regulation of the cortical representation of fingertip afferent input when it is relevant to providing stable cues for static balance control.

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Acknowledgments

This work was supported by research grants to WRS and WEM from the Natural Sciences and Engineering Research Council of Canada and by funds from the Canada Research Chairs program to WRS. DAEB was supported by postdoctoral fellowships from the Ontario Ministry of Research and Innovation and the Heart and Stroke Foundation Centre for Stroke Recovery. The authors thank Wendell Prime and Jeff Rice for constructing the touch platform used in this study and Jonathan Thacker and Kaitlyn Brown for assistance with data collection.

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Authors and Affiliations

  1. Department of Kinesiology, University of Waterloo, 200 University Avenue W, Waterloo, ON, N2L 3G1, Canada

    David A. E. Bolton, William E. McIlroy & W. Richard Staines

  2. Heart and Stroke Foundation Centre for Stroke Recovery, Toronto, ON, Canada

    David A. E. Bolton, William E. McIlroy & W. Richard Staines

  3. Sunnybrook Health Sciences Centre Research Institute, Toronto, ON, Canada

    William E. McIlroy

  4. Department of Medicine (Neurology), University of Toronto, Toronto, ON, Canada

    William E. McIlroy

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  1. David A. E. Bolton
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  2. William E. McIlroy
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  3. W. Richard Staines
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Correspondence to David A. E. Bolton.

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An erratum to this article can be found at http://dx.doi.org/10.1007/s00221-012-3037-4.

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Bolton, D.A.E., McIlroy, W.E. & Richard Staines, W. The impact of light fingertip touch on haptic cortical processing during a standing balance task. Exp Brain Res 212, 279–291 (2011). https://doi.org/10.1007/s00221-011-2728-6

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  • DOI: https://doi.org/10.1007/s00221-011-2728-6

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