Practice effects in reaction-time tasks in brain-injured patients.

"A study of performance trends in simple and choice reaction time tasks in nonpsychotic, brain-injured patients and a matched group of control patients indicated that, within the limits investigated (30 trials in each task), there were no significant practice effects with respect to mean reaction time for either group in either task. The performances of those brain-injured patients whose initial reaction times were within normal limits also failed to reflect significant practice effects… . The brain-injured patients showed a significant increase in intra-individual variability in simple reaction time with continued practice. However, this difference in trends was not found in the choice reaction task." (PsycINFO Database Record (c) 2010 APA, all rights reserved)