Which type of color deficiency is likely to adjust the mixture setting lower than normal, closer to 0?

The correct response indicates that a deuteranomalous trichromat is likely to adjust the mixture setting lower than normal, closer to 0, because this type of color deficiency involves a shift in sensitivity to green light due to a partial deficiency in the green photopigment.

In the case of deuteranomalous trichromacy, individuals perceive green light differently than those with normal color vision. Their altered sensitivity means that to achieve a color mixture that usually appears neutral or balanced to someone with typical color vision, they need to use less of the green component compared to red and blue. As a result, their adjustments in experimental settings often reflect a preference for lower green stimulus levels to reach the perceived equivalence of colors, placing the mixture setting closer to zero.

Understanding this behavior is essential for interpreting color mixture data in trichromatic individuals with varying degrees of color vision deficiency.