The opposite of clarity is best expressed with this statement: “for you: everything is the same as everything else, except that not always…” This is the condition of the current humanity.
Here is another type of brain fog: the too much information type.
The brain can be overwhelmed too… and pulled under.
This is, actually, the state most people are in. Drowning in stuff, that is neither useful, nor needed, nor fun.
One can compare it to a frat party every day. You are encouraged to drink to your fill, then maybe, hopefully vomit and do it again.
Black out, rape someone and don’t even remember, lie, cheat, follow the leader.