Table 4

 Factor loadings of cognitive tests

First unrotated principal componentObliquely rotated components
General cognitive factorVisuospatial factorVerbal memory factor
Raven’s Standard Progressive Matrices0.800.830.41
Benton Visual Retention Test0.730.810.29
Visual reproduction0.790.800.47
Logical memory0.660.430.89
Rey Auditory-Verbal Learning Test0.620.390.88
Verbal fluency0.580.640.22
Digit-Symbol Substitution Test0.750.740.47
Eigenvalues3.533.272.30