Psychiatric diagnoses depend on clusters of signs and symptoms. For major depression, for example, some criteria are low mood; wanting to die; and sleep, appetite and energy changes. These diagnoses lack the specificity of the biological markers that neuroscience seeks to identify. If we could find a genetic, neuroimaging or brain-circuit explanation for a mental illness, it might even yield a cure, rather than just the treatment of what can be recurrent, chronic conditions.
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