caa a22 4500 445352906 CHVBK 20180317142850.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00221-010-2529-3 doi (NATIONALLICENCE)springer-10.1007/s00221-010-2529-3 Vibratory noise to the fingertip enhances balance improvement associated with light touch [Elektronische Daten] [Fernando Magalhães, André Kohn] Light touch of a fingertip on an external stable surface greatly improves the postural stability of standing subjects. The hypothesis of the present work was that a vibrating surface could increase the effectiveness of fingertip signaling to the central nervous system (e.g., by a stochastic resonance mechanism) and hence improve postural stability beyond that achieved by light touch. Subjects stood quietly over a force plate while touching with their right index fingertip a surface that could be either quiescent or randomly vibrated at two low-level noise intensities. The vibratory noise of the contact surface caused a significant decrease in postural sway, as assessed by center of pressure measures in both time and frequency domains. Complementary experiments were designed to test whether postural control improvements were associated with a stochastic resonance mechanism or whether attentional mechanisms could be contributing. A full curve relating body sway parameters and different levels of vibratory noise resulted in a U-like function, suggesting that the improvement in sway relied on a stochastic resonance mechanism. Additionally, no decrease in postural sway was observed when the vibrating contact surface was attached to the subject's body, suggesting that no attentional mechanisms were involved. These results indicate that sensory cues obtained from the fingertip need not necessarily be associated with static contact surfaces to cause improvement in postural stability. A low-level noisy vibration applied to the contact surface could lead to a better performance of the postural control system. Springer-Verlag, 2010 Sway nationallicence Stochastic resonance nationallicence Vibration nationallicence Postural control nationallicence Somatosensation nationallicence Posture stabilization nationallicence ANOVA : Analysis of variance nationallicence AP : Anterior-posterior nationallicence BS : Best stimulation nationallicence COP : Center of pressure nationallicence COPap : COP in the anterior-posterior axis nationallicence COPml : COP in the medio-lateral axis nationallicence g : Gravity of Earth nationallicence HF : High frequencies nationallicence LF : Low frequencies nationallicence LT : Light touch nationallicence ML : Medio-lateral nationallicence PSD : Power spectral density nationallicence QS : Quiet standing nationallicence RMS : Root mean square nationallicence RMSap : COPap RMS nationallicence RMSml : COPml RMS nationallicence SD : Standard deviation nationallicence SR : Stochastic resonance nationallicence VMap : COPap velocity nationallicence VMml : COPml velocity nationallicence VS1 : Vibratory stimulation 1, at intensity 0.4g nationallicence VS2 : Vibratory stimulation 2, at intensity 0.8g nationallicence Magalhães Fernando Neuroscience Program and Biomedical Engineering Laboratory, Universidade de São Paulo, EPUSP, PTC, Avenida Professor Luciano Gualberto, Travessa 3, n. 158, São Paulo, SP, Brazil aut Kohn André Neuroscience Program and Biomedical Engineering Laboratory, Universidade de São Paulo, EPUSP, PTC, Avenida Professor Luciano Gualberto, Travessa 3, n. 158, São Paulo, SP, Brazil aut Experimental Brain Research Springer-Verlag 209/1(2011-03-01), 139-151 0014-4819 209:1<139 2011 209 221 https://doi.org/10.1007/s00221-010-2529-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-010-2529-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Magalhães Fernando Neuroscience Program and Biomedical Engineering Laboratory, Universidade de São Paulo, EPUSP, PTC, Avenida Professor Luciano Gualberto, Travessa 3, n. 158, São Paulo, SP, Brazil aut NATIONALLICENCE 700 1- Kohn André Neuroscience Program and Biomedical Engineering Laboratory, Universidade de São Paulo, EPUSP, PTC, Avenida Professor Luciano Gualberto, Travessa 3, n. 158, São Paulo, SP, Brazil aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 209/1(2011-03-01), 139-151 0014-4819 209:1<139 2011 209 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer