Figure 4

Foot strike time-locked theta time series. (A) Average theta time series for both stepping directions, with forward (Fwd) stepping indicated in red and backward (Bwd) stepping indicated in black. The highlighted white background indicates the temporal window where platform deceleration effects on theta dynamics are minimal. Significant difference in theta power between backward foot strikes relative to baseline with corrected false detection rate (fdr) is presented with a thicker line. Significant differences in theta power dynamics between stepping directions are indicated with dark grey (fdr corrected, ‘corr’) and light grey (uncorrected, ‘uncorr’). The horizontal blue line on the x-axis represents the average latency of platform deceleration onset (Bwd decel lat) relative to the instant of foot strike and standard deviation during backward stepping trials. (B) Spearman correlation over time of margin of stability (MoS) at foot strike with theta power. Significant correlation time window for backward foot strikes is indicated with a thicker line.