A big collaboration is trying to understand diseases of the psyche

DISEASES of the psyche have always been slippery things. Schizophrenia, bipolar disorder, major depression and a host of others have no visible markers in the brain. Their symptoms overlap sufficiently that diagnoses may differ between medical practitioners, or even vary over time when given by a single practitioner. In this they are unlike neurological diseases. These either leave organic traces in the brain that, though not always accessible before a patient's death, are characteristic of the ...