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Fig. 7. Tuning coefficients. The mean values, over all participants and trials, of
the normalized tuning coefficients are plotted for three spatial directions.
The tuning coefficients correspond to the PCs shown in
Fig. 6. Here the normalized
tuning coefficients were computed using Eqn
17, and were obtained as gait percentage averages over all
participants and walking trials. To provide information on the variability of
each normalized tuning coefficient, a variability number
Bi(j) is assigned to each curve, where
j=1...3 (spatial directions) and i=1...N (model
segments or PCs). Each number was computed by first estimating the area
between plus and minus one standard deviation about the tuning coefficient
mean, and then dividing by the total area beneath the tuning coefficient mean
– from 0% to 100% gait cycle.
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