I suspect our American cousins hear a different word entirely:
For those of you with the time, please join the debate about whether "brain disorder" is a more acceptable term than "mental illness". Personally, I am with Katie.
"I have come round to the phrase, but it was only when Dr Insel added "circuitry" into it during his talk at the symposium that I really saw where he was coming from. Brain circuitry disorder makes an awful lot more sense to me. Before that, I approached "brain disorder" from the organic, but-there's-no-hole-in-my-head front. Brain disorder makes me think of lesions and visible pathology, brain CIRCUITRY disorder and the analogy of heart arrhythmias makes perfect sense"