Figure 3

Visual representation of the dataset generated by a single TUG trial. Each of the seven sensors generated an acceleration trace; each trace was processed with sampling windows of 2.5, 5, 7.5 and 10 s to generate four iFOG waveforms (the ratio of freeze to locomotor band power); fourteen binary traces from each of the four iFOG waveforms were then formed using an iFOG threshold of 0.5 to 7 in steps of 0.5, resulting in a total of 56 binary FOG traces per sensor, and 392 per TUG trial. Each binary waveform provided a measure of number of FOG events and the percent time frozen.