Fig. 7.

(A) Conditional effect of prefrontal laterality (low demand − fixation) on fluid ability at different values of the continuous moderator variable age. Confidence bands estimated using the Johnson-Neyman procedure indicate the age ranges at which laterality had a significant, or non-significant relationship to fluid ability. For those under age ~43, stronger left-lateralization was significantly related to higher fluid ability (positive laterality slope), whereas decreased left-lateralization (greater bilaterality) was related to better fluid ability in those over ~71 (negative laterality slope). (B) Moderation effect of continuous age on the relationship between prefrontal laterality (low demand − fixation) and fluid ability. Left asterisks indicate significant simple slopes.