Using principal component analysis to reduce complex datasets produced by robotic technology in healthy participants

Wood, Michael D.; Simmatis, Leif E. R.; Gordon Boyd, J.; Scott, Stephen H.; Jacobson, Jill A.

doi:10.1186/s12984-018-0416-5

Journal of NeuroEngineering and Rehabilitation

Table 4 Principal component loadings for KINARM behavioral battery

From: Using principal component analysis to reduce complex datasets produced by robotic technology in healthy participants

Task	KINARM Items	Component Loadings
Task	KINARM Items	1	2	3	4	5
Arm Position Matching	Absolute Error X	0.870	0.210	− 0.040
	Absolute Error Y	0.320	0.400	− 0.230
	Absolute Error XY	0.910	0.250	−0.100
	Variability X	0.260	0.810	−0.130
	Variability Y	0.140	0.750	−0.060
	Variability XY	0.270	0.860	−0.140
	Contraction Expansion Ratio X	−0.120	−0.040	0.890
	Contraction Expansion Ratio Y	0.020	− 0.140	0.800
	Contraction Expansion Ratio XY	−0.060	− 0.050	0.990
	Shift X	−0.550	0.580	−0.070
	Shift Y	0.250	−0.580	−0.070
	Shift XY	0.870	−0.030	− 0.040
Ball on Bar	Targets completed	0.997	−0.146	0.001
	Mean movement time	−0.965	0.066	−0.037
	Mean ball speed	0.942	0.083	0.029
	Mean right hand speed	0.913	0.164	−0.017
	Mean left hand speed	0.956	0.045	0.020
	Right hand speed maxima	0.054	−0.012	0.950
	Left hand speed maxima	0.175	−0.069	0.766
	Mean bar angle rad	−0.067	0.633	−0.045
	Stdev bar angle rad	−0.056	0.801	−0.201
	Bar length variability*	0.250	0.335	0.145
	Hand speed diff	0.473	0.639	0.108
	Norm absolute hand speed diff	0.027	0.849	0.166
	Hand speed peak bias	−0.263	0.113	0.732
	Hand path bias*	−0.098	0.342	−0.191
Visually Guided Reaching	Posture speed	−0.077	0.519	0.512
	Reaction time	0.078	−0.162	0.863
	Initial direction error	0.547	0.291	0.435
	Initial distance ratio	−0.915	0.073	− 0.096
	Speed maxima count	0.780	−0.324	−0.323
	Min max speed difference	0.738	0.568	0.098
	Movement time	0.105	−0.950	− 0.035
	Path length ratio	0.773	0.485	0.142
	Max speed	0.371	0.847	−0.148
Reverse Visually Guided Reaching	Posture speed	−0.050	0.614	0.394
	Reaction time	0.022	−0.016	0.800
	Initial direction error	0.818	0.224	0.055
	Initial distance ratio	−0.856	0.133	− 0.343
	Initial speed ratio	−0.806	− 0.023	0.316
	Speed maxima count	0.837	−0.101	0.302
	Min max speed difference	0.263	0.721	0.053
	Movement time	0.621	−0.680	0.229
	Path length ratio	0.547	0.692	−0.013
	Max speed	−0.248	0.871	−0.303
	Correction time	0.788	0.095	−0.330
Object Hit	Total hits	−0.028	0.137	0.932
	Hits with left	−0.612	0.053	0.658
	Hits with right	0.545	0.218	0.758
	Median error	−0.046	0.119	0.647
	Miss bias^a	−0.040	− 0.022	− 0.365
	Right hand speed	0.322	0.847	0.204
	Movement area (right)	0.200	0.881	0.052
	Left hand speed	−0.148	0.888	0.132
	Movement area (left)	−0.219	0.915	0.061
	Hand bias of hits	0.893	0.166	0.082
	Hand transition	−0.863	− 0.008	0.051
	Hand selection overlap	−0.056	0.612	0.094
	Hand speed bias	0.876	0.037	0.140
	Movement area bias	0.719	−0.290	−0.063
Object Hit and Avoid	Total hits	−0.125	0.933	0.037	0.067	0.006
	Hits with left	−0.092	0.780	−0.453	0.034	0.233
	Hits with right	−0.061	0.748	0.483	0.070	−0.210
	Total Distractor hits	0.982	0.009	0.013	0.036	−0.012
	Distractor hits (left)	0.925	0.034	−0.020	−0.025	0.019
	Distractor hits (right)	0.896	−0.001	0.033	0.070	−0.027
	Median error	−0.414	0.419	0.076	0.073	−0.012
	Miss bias	−0.043	0.034	0.063	0.008	0.914
	Right hand speed	0.133	0.239	0.304	0.724	−0.025
	Movement area (right)	0.004	−0.054	0.360	0.854	0.050
	Left hand speed	0.133	0.215	−0.241	0.764	0.136
	Movement area (left)	−0.010	−0.035	− 0.327	0.922	− 0.125
	Hand bias of hits	−0.010	0.042	0.809	0.058	−0.387
	Hand transition	−0.060	0.030	−0.824	−0.082	− 0.390
	Hand selection overlap	0.021	−0.291	0.107	0.568	0.124
	Hand speed bias	0.003	0.045	0.840	0.007	−0.238
	Movement area bias	0.029	−0.029	0.860	−0.131	0.239
	Objects hit	0.484	0.856	0.003	0.037	−0.041
	Distractor proportion	0.963	−0.112	−0.003	0.027	−0.005
	Object processing rate	−0.380	0.799	0.000	0.071	0.041

Bold text indicates that the component loading is substantial (≥ .40). ^adenotes that the KINARM parameter did no substantially load onto any component

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ISSN: 1743-0003

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