BrainHQ and the many others have been studied extensively. They can awaken dormant skills but do little to effect healing based improvements. Those studies showed the goal should be improving processing/response speed and enhancing observational skills as those improvements effect more global improvements. The other skills are focal improvements and are task oriented.

I would love to see a study that shows brain training works to retrain injured brains beyond the wake up or retrain dormant or lazy skills concept.