I wonder sometimes, too. I abused a lot of drugs when I was a teenager / was in my early 20's. That could have done it. Or maybe it was the bi-lateral ECT. I think my trouble with linking faces to names or names of songs to sound of song to name of band kinds of directory issues has been only since then... Or maybe it was all the psych meds... I had a lot of old generation anti-psychotics over the years etc...

There isn't really any way to know. I mean, there are studies on long term effects... But they compare one population (on average) to (the average of) another population. So... Nothing definitive with respect to whether they have affected YOU or not...

I see how it is something to wonder / worry about... It really ate at me for a while there... But there isn't any way to know... Your mind... To a very large extent it is like a muscle that grows and gets stronger with use and wastes away and atrophies with disuse. Ruminating on it being ruined... Isn't helping it grow stronger...

Sometimes I wonder if it was the years of depression... I'm not using it / strengthening it when I'm all 'meh, can't be bothered' either...