Figure 5: Frontal lobe model.

This model represents the hypothesis that age-related individual differences in frontal lobe structure can be captured by a single factor, representing overall PFC integrity. This model fits the data poorly, χ2=670.11, df=32, P<0.00001, RMSEA=0.188 (0.176–0.200), CFI=0.728, SRMR=0.158, Satorra–Bentler scaling factor=1.05).