Fluid intelligence is related to capacity in memory as well as attention: Evidence from middle childhood and adulthood
Fig 2
Test of positive manifold in children and adults.
As the threshold for identifying a “positive manifold” increased, the number of correlations that satisfy that threshold decreased. Error bands denote 95% percentiles from 10,000 bootstrapped samples for each of 26 evenly spaced correlation thresholds. Thresholds for statistical significance, at alpha = .05, are r = 0.304 (children) and r = 0.219 (adults).