One needs to keep in mind that brain training develops and improves skills. The research cannot show that it causes healing.

So, if you find improvements from brain training, you should expect to need to continue that brain training to maintain that improvement. There have been a number of treatments found for PCS and related symptoms but they all have been found to only help during treatment and shortly thereafter.

I compare it to developing mental math skills. I can do very well when I am practiced. But, if I am not mental math active, my skills deteriorate. I can regain those skills with continued practice.

Some of us who once were high performers without needing continued practice before PCS will need to do that practice to achieve the high levels of performance after PCS. I have never been able to restore my short term memory after 15 years and hundreds of hours of mental stimulation. I have learned skills that enable me to do more with less memory.