Abstract: The invention relates to a device and a method to identify a depressed person at risk for a depressive relapse or recurrence. The device measures biological signals from the brain of a person in order to detect depressed persons who are at risk for depressive relapse or recurrence. The device comprises a measuring unit that measures the electrodermal activity in the fingers of the person in order to detect depressed persons who are at risk for depressive relapse or recurrence. The measuring unit is arranged to transmit a certain experimentally well defined pattern of sound or tone signals to the person and to provide a signal for the analysis of the electrodermal response from the person in question. The invention also relates to a device and a method to perform the analysis of the electrodermal response by means of machine learning technique.

Abstract: A device for evaluation of suicide risk of a person. A measuring unit measures electrodermal activity in fingers of the person to detect depressed persons who are at risk for suicide. The measuring unit is arranged to transmit a sound signal or tone to the person and to provide a signal for analysis of the electrodermal activity from the person. A measuring module measures orientation reactions in the form of blood volume variations of the person, preferably by a phtophletysmographic method peripherally in the fingers and/or centrally in the frontal lobe of the brain through the forehead, and changes in the pulse rate of the test person.