This describes my experience, too: deliberate effort to think about something leaves me unable to direct my thoughts after a while, affects memory, etc..
I can sustain undirected thinking for longer without the same kind of exhaustion although that usually runs out in it’s own way and my mind gets quite and stops randomly coming up with thoughts or at least the desire to follow the thoughts that do come up.
This describes my experience, too: deliberate effort to think about something leaves me unable to direct my thoughts after a while, affects memory, etc..
I can sustain undirected thinking for longer without the same kind of exhaustion although that usually runs out in it’s own way and my mind gets quite and stops randomly coming up with thoughts or at least the desire to follow the thoughts that do come up.