Pixar's Inside Out: Based On a Darwin-Influenced '60s Psychology Theory?

My review for "Inside Out" is going semi-viral (as viral as a Christian movie review can go in this context), which is cool, but I wonder if it's because I pointed out something a little surprising: Pixar's brilliant (and seriously hilarious, fun, often moving movie) -- unfortunately (in my opinion) -- uses a psychological theory from the '60s (that I don't particularly agree with) for its entire premise. At the very least, it's indirectly informed and influenced by it.

Check it out here: http://rockingodshouse.com/inside-out-christian-movie-review/