Table 8b.

EFA of the combined HRB and WAIS/WAIS-R: correlations between factors

	Working memory	Fluency	Phonological decoding	Semantic knowledge	Verbal episodic memory	Visuospatial cognition	Perceptual-motor speed	Perceptual attention
Working memory	1
Fluency	0.385	1
Phonological decoding	0.326	0.348	1
Semantic knowledge	0.434	0.531	0.313	1
Verbal episodic memory	0.377	0.366	0.096	0.380	1
Visuospatial cognition	0.427	0.420	0.048	0.454	0.558	1
Perceptual-motor speed	0.287	0.51	0.085	0.228	0.536	0.594	1
Perceptual attention	0.079	0.401	0.022	0.174	0.340	0.425	0.412	1

Note: EFA = Exploratory Factor Analysis; HRB = Halstead-Reitan Battery; WAIS = Wechsler Adult Intelligence Scales; WAIS-R = Wechsler Adult Intelligence Scales-Revised. Effect sizes are gauged based on Cohen’s criteria (Cohen et al., 2003)—that is, small (r² ≥ .02 = r ≥ .14), medium (r² ≥ .13 = r ≥ .36), and large (r² ≥ .26 = r ≥ .51)—and are color-coded using very light gray, light gray, and dark gray-shaded areas, respectively.