AbstractIn a previous study we noted that a female observer, T, who was diagnosed as a normal trichromat, gave about 536 nm for her unique yellow, which was usually perceived as either green or yellowish‐green by other normal observers. To explore further these individual differences we conducted several preliminary experiments. When we assumed a less sensitive green function for T, who showed no sign of color anomalies with several kinds of color‐blindness tests, we showed that we could interpret the individual differences depicted in three kinds of measures of unique‐yellow loci, namely with colored background, in relative strength ofrtogin the context of the opponentcolor theory, and by matching wavelengths to colored papers. One might think of the unique‐hue‐determination technique as being a new sensitive and simple way to investigate color mechanisms, for both normal and abnormal col
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