I am a little confused by your question, vini.

Is there a difference between your terms: PCS and TBI?

I was diagnosed with a minor traumatic brain injury. The occupational therapist that worked with me once said that people who have the most difficult time recovering are those with "minor" TBI's. Her hypothesis was that our general intelligence isn't affected by the injury, but our slower processing speed and newly lowered limitations cause a lot of frustration and distress.

Commonly, only those close to us can see a difference. A lot of times, even they can't pick up on the struggles. Those with the injury, however, remain very aware of the difference. It's very hard to accept our limitations when others cannot see it. In my opinion, anyway. As a result, I often question what I can and cannot do. I'm not very good at reasoning, yet I push myself to do it. (It's a personality characteristic I've always had.) If I can't, I want to know why. Why, why, why. Jeez...ridiculous!

Okay, I'll get off my soapbox now too. I hope that I've answered your Q adequately.
Shez