Biomarker of the colour perception of a mammal subject based on pupil frequency tagging

System for generating an indicator or biomarker (SIGpower, APPROXpower) of the perception of colors by a mammal subject, comprising:

• a display peripheral,
• a computational system for stimulating the mammal subject with a dynamic multi-color, stimulus, the computational system controlling the display, on the display periphery, of a multi-color pattern at least two colors of which are periodically inverted at a frequency called the tagging frequency (Ftag),
• a color controller configured to modify over time at least one (C2) of the two colors of the multi-color pattern during the display of the dynamic multi-color stimulus, in order to make the displayed luminance of this color vary,
• an image-acquiring device for acquiring an oscillatory response (SIGresp) of at least one pupil of the mammal subject, during the display of the dynamic multi-color stimulus, and
• an indicator or biomarker generator configured to generate, from the acquired response, a signal (SIGpower, APPROXpower) representative of the power of the oscillatory response (SIGresp) of the pupil as a function of the modification over time of at least one of the two colors during the display of the dynamic multi-color stimulus.