(1) The nocturnal origins of primates imposed constraints on certain sensory systems, namely trichromatic vision.(2) Accordingly, the successful acquisition of fruits (or fruits of particular colors) cannot be strongly tied to the evolution of routine trichromatic vision.(3) The general principle underlying the design of visual trichromatic colorimeters. may be briefly summarized as follows.(4) An important theory was put forward by Young in the 18th century and was developed by Helmholz to give the trichromatic scheme which states that there are three fundamental colours.(5) None of today's New World monkeys has trichromatic color vision - except for the howler monkey.(6) The human eye is trichromatic , as our color vision involves three distinct classes of cones.(7) Many species - including the trichromatic honeybee - have a kind of photoreceptor sensitive to the near-ultraviolet, outside the visible spectrum.(8) Primates, including humans, have three cones and can thus distinguish three of the primary color phases, giving us trichromatic vision, or high color resolution.(9) Theoretical modeling of fruit spectra into the trichromatic color space of catarrhine primates yielded similar results.(10) Between 30 million and 35 million years ago, however, our primate ancestors began to develop the trichromatic color sensitivity that humans, apes, and Old World monkeys possess today.(11) People with trichromatic color vision see not only four primary colors (blue, green, yellow, and red) but also various intermediate colors between them.(12) Similarly, we may have preferences for certain colors based on the primate trichromatic color visual system.(13) Why would the only monkey in South America to evolve trichromatic vision be the one that eats the least amount of fruit?(14) Here I show that softening texture also characterizes the fruit ripening process, and that color is of ambiguous importance to primates possessing trichromatic vision.(15) Then came the mutation of trichromatism , which enabled us to see fruit - cherries, say - more easily against a variegated leafy background.(16) Position and brightness are two generally useful clues, as well as the slight differences that may be perceived even with severe anomalous trichromatism .
