Parameters quantified by the model of coupled phase-oscillators.

Mesh figures show how each φCV, φ_deviation, the slope of the regression line between the relative step phase and the phase change, and stride time CV varying according to the strength of the phase reset (amp) and the magnitude of noise in the phase reset (σ). Strong phase reset (large values of amp) decreased φCV and φ_deviation, and increased stride time CV. All three of these parameters increased as noise (σ) increased. The slope of regression line between the relative step phase and the phase change decreased with increases in the strength of phase reset. The model mimicking the gait patterns in FOG−P (red dots) showed stronger (larger amp) and noisier (larger σ) phase reset than the model mimicking the gait patterns in PD−FOG (blue dots). The mesh figures show results from one typical set of model parameters (ω1 = ω2 = 1/2π, α = β = 0.05), therefore the red and blue dots are not consistent with the values shown by the mesh figures. However, the results obtained from the other set of model parameters also exhibited the same tendency.