Abstract: A wearable biosensor device gathers physiological data from the wearer and uses this information over time to diagnose, detect, monitor, and treat psychological disorders. The device triggers real-time psychological treatments based on personalized estimates of the wearer stored on the biosensor device. A therapeutic stimulus is selected from a library based on the data received from the wearable biosensor device and relating to psychological condition(s), and that stimulus is delivered to the wearer via an associated display. The aggregate data from use of the device is provided to clinicians and/or patients, in detail and in summary report forms, to indicate the symptoms of, detect and diagnose among disorders or subtypes, to analyze treatment effects, and to isolate the underlying causes of one or more psychological disorders or states.