Table 2.

Loadings for the top two principal components (PCs)

PC1 (cognition) loadings	Measure	PC2 (motor) loadings	Measure
0.202	SSP span length	0.308	RTI mean simple movement time
0.200	SOC problems solved in minimum moves	0.299	RTI median simple movement time
0.167	SOC problems solved in minimum moves, three moves	0.299	RTI mean five-choice movement time
0.159	IED stages completed	0.298	RTI median five-choice movement time
0.153	SOC problems solved in minimum moves, four moves	0.259	RTI five-choice movement time
0.147	SOC problems solved in minimum moves, five moves	0.257	RTI five-choice reaction time
0.137	PRM percent correct	0.243	RTI median simple reaction time
0.116	SOC problems solved in minimum moves, two moves	0.242	RTI mean simple reaction time
0.111	SOC mean initial thinking time five moves	0.172	RTI SD five-choice reaction time
0.086	SSP total errors	0.169	RTI SD simple movement time
0.036	SOC mean initial thinking time five moves	0.169	RTI SD simple reaction time
0.011	RTI simple accuracy score	0.167	RTI SD five-choice movement time
−0.001	SOC mean initial thinking time two moves	0.122	RTI simple accuracy score
−0.009	RTI SD simple movement time	0.110	SOC problems solved in minimum moves, five moves
−0.020	RTI five-choice accuracy score	0.110	SOC problems solved in minimum moves
−0.072	RTI SD five-choice movement time	0.100	IED stages completed
−0.072	SWM within errors	0.084	SOC problems solved in minimum moves, three moves
−0.085	SWM double errors	0.076	SOC problems solved in minimum moves, four moves
−0.086	SOC mean initial thinking time three moves	0.073	RTI five-choice accuracy score
−0.095	IED EDS errors	0.048	SSP span length
−0.101	SOC mean subsequent thinking time two moves	0.046	SSP total errors
−0.106	SWM mean time to first response	0.045	PRM percent correct
−0.115	SOC mean moves two moves	0.035	SOC mean moves, two moves
−0.125	RTI mean simple movement time	0.027	SWM mean time to the first response
−0.131	RTI median simple movement time	0.013	SOC mean subsequent thinking time two moves
−0.134	RTI median five-choice movement time	0.008	SOC mean initial thinking time four moves
−0.136	RTI mean five-choice movement time	-0.023	IED pre-ED errors
−0.137	RTI median simple reaction time	-0.026	SOC mean initial thinking time two moves
−0.138	SOC mean subsequent thinking time three moves	-0.034	SOC problems solved in minimum moves, two moves
−0.146	RTI five-choice reaction time	-0.037	IED total latency
−0.150	RTI SD simple reaction time	-0.044	SOC mean initial thinking time five moves
−0.151	IED pre-ED errors	-0.054	SOC mean moves, four moves
−0.151	SOC mean subsequent thinking time five moves	-0.063	SOC mean moves, three moves
−0.152	SOC mean moves four moves	-0.071	SWM mean time to the last response
−0.154	RTI mean simple reaction time	-0.085	SOC mean subsequent thinking time three moves
−0.157	RTI five-choice movement time	-0.090	SWM within errors
−0.158	SOC mean moves five moves	-0.093	IED EDS errors
−0.171	SOC mean moves three moves	-0.097	SWM between errors
−0.172	RTI SD five-choice reaction time	-0.097	SWM total errors
−0.175	IED total errors	-0.100	SOC mean initial thinking time three moves
−0.176	IED total latency	-0.100	SWM strategy
−0.176	IED total trials	-0.103	SWM double errors
−0.181	SOC mean subsequent thinking time four moves	-0.106	SOC mean subsequent thinking time five moves
−0.183	IED total errors adjusted	-0.115	IED total errors adjusted
−0.187	IED total trials adjusted	-0.116	IED total trials adjusted
−0.188	SWM mean time to the last response	-0.119	SOC mean subsequent thinking time four moves
−0.193	SWM strategy	-0.124	IED total errors
−0.200	SWM total errors	-0.127	IED total trials
−0.202	SWM between errors	-0.148	SOC mean moves, five moves

Note: PC1 loaded heavily on SWM, spatial span, and spatial planning processes. PC2 loaded heavily on simple reaction time measures.