I recently wrote a short note about how the brain worked, sort of. A response was that it omitted models, which it did. I wondered then how many other ‘mental faculties’ there are. These are not entirely orthogonal, but I try for orthogonality. I have probably omitted half of the important faculties. Relations between these things may indeed be more significant than the things themselves.

Somewhere I heard some category of faculties divided by this dichotomy:

This dichotomy was used to explain many familiar temporary aberrations of thinking in terms of temporary failures in one of these two. Bipolar disorder was amusingly explained as alternate domination of one of these two over the other.
Somewhere: the subjunctives: Could I, Would I, Should I?