The invention relates to the evaluation of the colour perception of mammals for obtaining a biomarker characteristic of each subject tested. It takes advantage of the slow pupillary oscillation response to generate an objective neurological signature of said colour perception. A pupil frequency tagging method is used at a tagging frequency Ftag adapted to the speed of the pupillary response. A dynamic two-coloured stimulus is displayed, comprising a two-coloured motif, both colours being inverted at the frequency Ftag and one of the colours varying progressively through a range of possible values. On the basis of the pupillary response, a signal representing the power of the oscillatory response of the pupil is generated. The minimum of the signal corresponds to the relative isoluminance of the pair of colours tested.
BIOMARKER OF THE COLOUR PERCEPTION OF A MAMMAL SUBJECT BASED ON PUPIL FREQUENCY TAGGING