three colour vision tests consisting of 16 hues (Fig. 2b, c). Four-to-six months were required to test all 16 hues; thus, baseline results represent testing conducted for more than a year. As predicted, before treatment monkeys had low thresholds (averaging ,0.03 units in u9, v9 colour space) for colours that represent blues and yellows to their eyes, but always failed to discriminate between the blue-green and the red violet(dominant wavelengths of 490 nm and 2499 nm,respectively) hues, with thresholds extrapolated from psychometric functions being orders of magnitude higher (Fig. 2b, c). Results were highly repeatable, with no improvement between the first and third tests, making us confident that the animals would not spontaneously improve in the absence of treatment.
three colour vision tests consisting of 16 hues (Fig. 2b, c). Four-to-six months were required to test all 16 hues; thus, baseline results represent testing conducted for more than a year. As predicted, before treatment monkeys had low thresholds (averaging ,0.03 units in u9, v9 colour space) for colours that represent blues and yellows to their eyes, but always failed to discriminate between the blue-green and the red violet(dominant wavelengths of 490 nm and 2499 nm,respectively) hues, with thresholds extrapolated from psychometric functions being orders of magnitude higher (Fig. 2b, c). Results were highly repeatable, with no improvement between the first and third tests, making us confident that the animals would not spontaneously improve in the absence of treatment.
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