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Experimental Brain Research

, Volume 203, Issue 3, pp 533–540 | Cite as

The relationship between physiological arousal and cortical and autonomic responses to postural instability

  • Kathryn M. Sibley
  • George Mochizuki
  • James S. Frank
  • William E. McIlroyEmail author
Research Article

Abstract

Postural instability evokes cortical and autonomic reactions in addition to the primary compensatory response, and it is hypothesized that these responses may be related to underlying affective influences such as tonic physiological arousal. The purpose of this study was to determine whether perturbation-evoked cortical potentials (N1 and P2) and electrodermal responses (EDRs) were related to each other or to tonic electrodermal level (EDL). Ten healthy individuals received sixty perturbations while standing at ground level (LOW) and at the edge of an elevated platform (HIGH), where an unsuccessful reaction could lead to a fall from a height of 160 cm. Postural responses, tonic EDLs and N1 potentials were all significantly larger (p ≤ 0.01) at the HIGH height relative to LOW. EDR amplitudes did not show a main effect of condition, but habituated less at the HIGH height (interaction p = 0.04). P2 potentials were not different between conditions (p > 0.05). There was no statistically significant relationship between the magnitude of change in N1 amplitude between conditions and the change in EDR amplitude between conditions (R = 0.25, p = 0.5), between magnitude of N1 change and magnitude of EDL change (R = −0.23, p = 0.25), or between magnitude of EDR change and EDL change (R = −0.51, p = 0.16). Altered cortical and autonomic responses at the HIGH height were independent of elevated physiological arousal. These findings have implications for understanding the role of cortical and autonomic responses in compensatory balance control, and alleviate concerns about the potential influence of underlying arousal on electrodermal reactivity.

Keywords

Compensatory balance Cortical potentials Electrodermal responses Postural reactions 

Notes

Acknowledgments

We thank H. Cheung, V. Miyasike-da-Silva and T. Patla for assistance with data collection. This research was supported by the Natural Sciences and Engineering Research Council of Canada and the Heart and Stroke Foundation of Canada. We acknowledge the support of the Toronto Rehabilitation Institute who receives funding under the Provincial Rehabilitation Research Program from the Ministry of Health and Long Term Care in Ontario.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Kathryn M. Sibley
    • 1
    • 2
  • George Mochizuki
    • 2
    • 3
  • James S. Frank
    • 4
  • William E. McIlroy
    • 1
    • 2
    • 3
    • 5
    • 6
    Email author
  1. 1.Institute of Medical Science, University of TorontoTorontoCanada
  2. 2.Toronto Rehabilitation InstituteTorontoCanada
  3. 3.Heart and Stroke Foundation Centre for Stroke Recovery, Sunnybrook Health Sciences CentreTorontoCanada
  4. 4.Faculty of Human KineticsUniversity of WindsorWindsorCanada
  5. 5.Department of KinesiologyUniversity of WaterlooWaterlooCanada
  6. 6.WaterlooCanada

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