Before treatment, monkeys were trained to perform a computerbased
colour vision test, the Cambridge Colour Test4,5, which was
modified for use with animals6 (Fig. 2a). Dichromats who are missing
either the L- or the M-photopigment fail to distinguish from grey:
colours near the so-called ‘spectral neutral point’ located in the bluegreen
region of colour space (near dominant wavelength of 490 nm)
and complementary colours near the ‘extra-spectral neutral point’ in
the red-violet region (near dominant wavelength of 2499 nm).
Whereas trichromats have the four main hue percepts blue, yellow,
red and green, dichromats only have two percepts, nominally blue
and yellow. Before treatment, two dichromatic monkeys complete
Before treatment, monkeys were trained to perform a computerbasedcolour vision test, the Cambridge Colour Test4,5, which wasmodified for use with animals6 (Fig. 2a). Dichromats who are missingeither the L- or the M-photopigment fail to distinguish from grey:colours near the so-called ‘spectral neutral point’ located in the bluegreenregion of colour space (near dominant wavelength of 490 nm)and complementary colours near the ‘extra-spectral neutral point’ inthe red-violet region (near dominant wavelength of 2499 nm).Whereas trichromats have the four main hue percepts blue, yellow,red and green, dichromats only have two percepts, nominally blueand yellow. Before treatment, two dichromatic monkeys complete
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