Table S1.

Percent of variance accounted for (pvaf) for the five strongest clusters contributing to the surface measured N1 component, separately for targets and non-target stimuli while standing, slow walking, and fast walking.

		N1
Target	Standing	Cluster	Cls 10	Cls 11	Cls 14	Cls 18	Cls 19	Sum
		pvaf %	9.5	29.6	16.8	7.3	6.7	69.9
Target	Slow walking	Cluster	Cls 10	Cls 11	Cls 14	Cls 18	Cls 19	Sum
		pvaf %	9.4	39.3	9.9	9.6	10.3	78.5
Target	Fast walking	Clusterd	Cls 8	Cls 11	Cls 14	Cls 18	Cls 19	Sum
		pvaf %	11.4	27.0	18.2	10.6	8.9	76.1
Non-target	Standing	Cluster	Cls 8	Cls 11	Cls 14	Cls 18	Cls 19	Sum
		pvaf %	17.0	36.9	26.5	23.7	18.0	122.1
Non-target	Slow walking	Cluster	Cls 8	Cls 11	Cls 14	Cls 18	Cls 19	Sum
		pvaf %	18.0	28.5	24.8	16.6	28.5	116.4
Non-target	Fast walking	Cluster	Cls 8	Cls 11	Cls 14	Cls 18	Cls 19	Sum
		pvaf %	12.4	32.3	25.9	16.7	20.2	107.5