[shkkmo]

> We know the why is “because the antidepressants were taken”.

We don't know that. The best we know is that people who take antidepressants on average experience more improvement than a placebo. We actually don't know who got better from taking antidepressants due to the placebo effect.

> I call something pseudoscience when the “why” is “pinned down” as something wholly unrelated, and the people involved haven't noticed;

This is a good point and I would agree that pseudosciences are generally bad at uncovering bad explanations. I will point out that the "chemical imbalance" theory is still widely believed even though it has been pretty thoroughly debunked.

I think the dichotomy science/pseudoscience if often applied to whole fields when there is often a mix of both within any given field. The prevelence can certainly be highly variable from field to field but it isn't as black and white as we like to suggest.