Biofeedback method and device, as well as a method for producing and presenting data

A sensor unit records psycho physiological data from users individual sensors. A software unit calculates activity data from parameters provided by the sensor which is passed to a function module. These are assembled into group activity data or passed to individual or group related users. The activity data is then represented by display, sound or other forms of stimulation. The software unit and function module form a mental unit configured as, e.g. an Internet server enabling users to log on to obtain a training menu for therapeutic or research purposes.