\tangent A computer-based color test might not be able to detect tetrachromacy, because monitors do not display a continuum of frequencies of light. They are intrinsically tied to trichromacy, by combining only three frequencies of light in different proportions. RGB.
It's mathematically possible that a continuous spectrum of light also wouldn't pick it up, if its only effect was that different combinations of frequency that appear identical to an ordinary person could be distinguished. (Not that this would confer any evolutionary advantage.)
It's mathematically possible that a continuous spectrum of light also wouldn't pick it up, if its only effect was that different combinations of frequency that appear identical to an ordinary person could be distinguished. (Not that this would confer any evolutionary advantage.)