Behavioral performance of primary versus secondary groups.

<p>Absolute () and relative () differences in performance measures for attention () and memory () tasks, where denotes the group average value of . Performance differences are reported as means and standard errors for subjects within the primary (gray) and secondary (red) groups. (a) The secondary groups show larger absolute differences in reaction time (RT) for both attention and memory tasks. (b) The secondary groups show larger relative differences between attention and memory tasks for both the criterion switch score (CS) and the d-prime () score.