Mean (± S.E) change in performance from pre-test to post-test for the experimental measures in each of the groups. Plots show performance for; A. change in TVA absolute bias, B. change in K’, C., K variability, D. change in number of targets cancelled by side on the star cancellation task and E. change in Dot Matrix performance. An * above the bar denotes that that group is a significant (p<0.05) predictor of post-test score. An * to the left of a bar indicates a significant (p<0.05) change in test performance between pre and post-test, as measured by paired sample t-tests.