posted on May, 9 2010 @ 06:52 PM
reply to post by invetro
Tetrachromatic vision in humans would be extremely rare, if it even exists at all. If women have two X chromosomes in their cells, some women could be
carrying different cone cell pigments because two cone pigment genes are located on the X chromosome, thus possibly making them tetrachromats.
However, this has not yet been confirmed and so is still debated.
However, tetrachromacy in other animal species is far more common. Spiders for instance, have tetrachromatic vision, along with most marsupials
(kangaroos), predatory birds, a few species of fish and of course reptiles.
As is explained in much more detail in my prior post on this thread, most humans have trichromatic vision. Most humans also have the same cell and
chemical construct in both their retina and the part of the brain responsible for processing the light being received through three opposing channels,
each from the raw light coming through the three cones of the retina, which would mean that we all should have the same approximate perception of
color. Of course there are some differences and therefore exceptions in a small percentage of the population, such as those with either damaged or
deformed cones, making them "color blind", but for the majority of humans, we all interpret light through the same processes with the same cell
construction, thereby making it highly unlikely that we perceive light or color differently. So, when asking yourself if you perceive "red" (or any
other color) differently from the guy/gal standing next to you, the answer is most likely yes, unless you run into the rare person with an
abnormality. If light gets its color from the wavelength of electromagnetic radiation and we process that light by and with the same means, it is safe
to conclude that our perception of light and its color is objective and not personally unique.
[edit on 9-5-2010 by airspoon]