Table 5.

Exploratory factor analysis with all 10 WM measures: factor loadings (loadings > 0.30 are boldfaced), commonalities, and factor correlations.

	Two-factor solution			Three-factor solution
	Factor 1	Factor 2	Communality	Factor 1	Factor 2	Factor 3	Communality
Visuospatial SSTF	0.58	0.09	0.41	-0.04	0.90	-0.13	0.63
Visuospatial SSTB	0.65	0.05	0.47	0.01	0.63	0.11	0.51
Visuospatial CST	0.51	0.17	0.40	0.18	0.37	0.17	0.39
Visuospatial RMT	0.61	0.04	0.41	0.06	0.39	0.25	0.39
Visuospatial 2back	0.69	-0.05	0.43	-0.01	-0.09	0.86	0.63
Numerical-verbal 2back	0.74	-0.10	0.46	-0.05	0.11	0.66	0.51
Numerical-verbal RMT	0.15	0.44	0.30	0.46	0.07	0.07	0.30
Numerical-verbal CST	0.21	0.44	0.35	0.48	-0.02	0.21	0.37
Numerical-verbal SSTB	-0.02	0.81	0.63	0.84	-0.02	-0.04	0.64
Numerical-verbal SSTF	-0.11	0.76	0.49	0.74	0.01	-0.12	0.48
Factor 1	1			1
Factor 2	0.63	1		0.62	1
Factor 3	NA	NA		0.55	0.68	1

SSTF, simple span task forward; SSTB, simple span task backward; CST, complex span task; RMT, running memory task. n = 656.