caa a22 4500 445353066 CHVBK 20180317142850.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00221-011-2549-7 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2549-7 Short and medium latency muscle responses evoked by electrical vestibular stimulation are a composite of all stimulus frequencies [Elektronische Daten] [Christopher Dakin, John Inglis, Jean-Sébastien Blouin] Electrical vestibular stimulation produces biphasic responses in muscles maintaining balance. The two components of these muscle responses (termed the short latency and medium latency components) are believed to be independent and elicited by vestibular stimuli of different frequencies. We tested these hypotheses by determining (a) if frequency-specific stimulation protocols could evoke independently the short and medium latency responses and (b) whether these two components are triggered by distinct brain regions with a fixed time delay, interacting around 10Hz. First, subjects were provided 10-25Hz, 0-10Hz, and 0-25Hz vestibular stimuli to selectively modulate the short latency, medium latency, or both components of the response; and second, they were provided twenty sinusoidal stimuli from 1 to 20Hz with a 0-20Hz control trial, designed to determine whether an interaction between the short and medium latency responses occurs at a specific stimulation frequency. Both the 0-10Hz and 10-25Hz vestibular stimuli elicited multiphasic waveforms, suggesting the short and medium latency components were not modulated independently by the frequency-specific stimuli. Sinusoidal vestibular stimuli evoked responses at the stimulated frequency but no evidence of a reflex component interaction was observed. Instead, summation of the responses evoked by each of the sinusoidal stimuli resembled the biphasic response to broad bandwidth stimuli. Due to the lack of interaction and linear contribution of all stimulus frequencies to both the short and medium latency responses, the present results support the use of broad bandwidth electrical vestibular signal for physiological or clinical testing. Springer-Verlag, 2011 Vestibular nationallicence Stochastic nationallicence Bandwidth nationallicence Balance nationallicence Dakin Christopher School of Human Kinetics, University of British Columbia, 210-6081 University Boul., V6T1Z1, Vancouver, BC, Canada aut Inglis John School of Human Kinetics, University of British Columbia, 210-6081 University Boul., V6T1Z1, Vancouver, BC, Canada aut Blouin Jean-Sébastien School of Human Kinetics, University of British Columbia, 210-6081 University Boul., V6T1Z1, Vancouver, BC, Canada aut Experimental Brain Research Springer-Verlag 209/3(2011-03-01), 345-354 0014-4819 209:3<345 2011 209 221 https://doi.org/10.1007/s00221-011-2549-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2549-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dakin Christopher School of Human Kinetics, University of British Columbia, 210-6081 University Boul., V6T1Z1, Vancouver, BC, Canada aut NATIONALLICENCE 700 1- Inglis John School of Human Kinetics, University of British Columbia, 210-6081 University Boul., V6T1Z1, Vancouver, BC, Canada aut NATIONALLICENCE 700 1- Blouin Jean-Sébastien School of Human Kinetics, University of British Columbia, 210-6081 University Boul., V6T1Z1, Vancouver, BC, Canada aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 209/3(2011-03-01), 345-354 0014-4819 209:3<345 2011 209 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer