Hi Mari,
I read that section of the article, but I don't really follow how the ear stuff relates to mania and depression. My confusion is based on the fact that I don't see any clean lateralization in regard to the mood symptoms of mania and depression respectively.
Eg: In mania, thinking can become significantly tangential - quite unlinear (right-brain); in depression, rumination can occur - very linear thinking, and also quite active.

In short, I am not convinced that BOTH sides of the brain aren't involved in terms of altered function.
What do you think? Do have a different view on this?
waves