By Gerald H. Jacobs
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Extra info for Comparative Color Vision
The absorption characteristics of the oil droplets have been measured for a number of different species (Muntz, 1972). In essence, the droplets serve as high-pass filters, absorbing strongly and nearly uniformly throughout the short wavelengths and then showing a rapid falloff in absorbance to the long wavelengths. 7. As shown in that figure, the droplets differ in the spectral location where they begin to transmit appreciable amounts of light, and it is this variation that leads to the differences in the colors of the various classes of droplets.
9 Schematic illustration of the basic structural features of the mammalian rod (left) and cone (right). 12). The presynaptic specializations seen in the terminal regions (spherule and pedicle) include electron-dense ribbons and surrounding synaptic vesicles. N is the nucleus. III. PHOTORECEPTORS 47 presence of oil droplets in some cones but never in rods, and the location of the receptor nuclei) to distinguish rods from cones (Crescitelli, 1972). 10 shows drawings made to represent the morphologies of photoreceptors found in the retinas of a variety of different classes of vertebrates.
What is meant by such labels is typically not made explicit. There are at least two aspects to this ambiguity. First, we have already noted that color vision may vary both qualitatively and quantitatively so the descriptor could be in reference to either of these. Thus, a dichromat could be described as having "poor" color vision, but so too could a "normal" trichromat whose wavelength difference thresholds were unusually large. Secondly, to what standards do these qualifiers apply? In the case of color vision the answer to this question is, clearly, the normal trichromacy of man.
Comparative Color Vision by Gerald H. Jacobs