1. A method for measuring a subject's reaction to stimuli (“reaction measurement”) presentation by using a measurement scale, the method comprising the steps of: I. Presenting the subject with stimuli and the measurement scale; II. Enabling the subject to indicate his reaction by moving the position of the scale with reference to time; III. Tracing and recording the scale positions and movements as function of time and/or detected measurement events (“measurement data”); IV. Detecting the final scale position; V. Evaluating and analyzing the measurement data in order to determine the subject's reaction to the stimuli;