Hopefully somebody with TBI knowledge/experience sees this and answers!

A dear friend of mine suffered a TBI when he was 8/9. He's in his late 40's now. He also was slipped a "hit" of LSD in a beer when he was 17/18. The trip that took him on landed him in-patient for a few days.

He's gainfully employed and in a profession that requires attention to detail in terms of mechanical workings of things.

But he definitely has cognitive issues; I've witnessed them first-hand repeatedly. It's not just simply "forgetting". He literally cannot follow conversations unless they are extremely simplistic. And, if they deviate even the slightest from a linear telling, he is completely lost and has absolutely no idea how to find his way back. He also misses subtle changes in conversational context i.e. if you say something a little sarcastic (but not have it come out sounding sarcastic), he will think you are being 100% serious.

I may not be describing this at all well . I've experienced this stuff about him for 18 months and have grown so concerned that I urged him to please get some cognitive testing done. I worry about him terribly. With age one's mental faculties don't typically sharpen.

Can anybody recommend any websites to look at about the various types of cognitive issues post-TBI? I'd like to write a letter that he can bring to a therapist that he's seeing next week (the same one that saw him after his inpatient experience) and I want to describe as best I can as many of the things that I see about him that are a bit "off" as possible.

Thank you!