Abstract: The disclosure relates to a system for measuring reactions of a subject, comprising: a screen able to display a plurality of stimuli via a refresh of pixels of the screen, the stimuli being apt to generate reactions from the subject; at least one sensor able to capture images of the subject reacting to the stimuli; and a logic unit configured to command the refresh of the pixels of the screen at a first frequency and the capture of the images of the subject by the sensor at a second frequency, one of the frequencies being an integer multiple of the other frequency. The logic unit also comprises a central clock configured to command the refresh of pixels of the screen and the capture of the images. The disclosure also relates to a method for measuring reactions of a subject, to a computer program and to a computer-readable medium.