Author : Shahrokh
N Sani 1 and Charles J Robinson 2
Volume, Issue,
Month, Year : Vol.6,
No.3/4, December 2016
ABSTRACT
A Sliding Linear Investigative
Platform for Assessing Lower Limb Stability (SLIP-FALLS) was employed to study
postural control biomechanical reaction to external perturbations in a short
≤16mm postural perturbation. Head acceleration were evaluated while blindfolded
subjects stood on a platform that was given a short anterior perturbation
presented in one of 2 sequential 4s intervals (2-Alternative-ForcedChoice) for
a set of 30 trials. Anterior-Posterior head acceleration (Head Accl AP) were
investigated among the movement and non-movement intervals for the healthy
adults. A strong ringing signal was observed in Head Accl AP movement interval
that was absent in non-movement interval. A positive power law trading
relationship was found between Head Accl AP gain and move length standing
blindfolded subjects. This could explain the observed negative power law
relationship between translation length and peak acceleration threshold in
previous psychophysical detection threshold studies.
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