Our conjecture was that depressions would be closely connected to stock-market crashes (at least in the sense that a crash would signal a substantially increased chance of a depression).

They argue that the high metabolic and social cost of depression is actually benefit: depression is an honest, believable signal to others that something is desperately wrong.

Methods16 patients with stroke dysphasia communicated with carton CARDS, body signal. All the patients were assessed by Hamilton Depression Scale (HAMD) in admission day, one week and two weeks later.