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. 2014 Jan 27;9(1):e86488. doi: 10.1371/journal.pone.0086488

Figure 1. Real-world color tasks — for instance, looking for ripe fruit — pose both perceptual and memory demands.

Figure 1

In this example, the key perceptual challenge is to perceive the surface color (perceptual correlate of reflectance) of the tomatoes accurately in each set despite illumination differences within and between sets. This is challenging for vision because many different combinations of surface reflectance and illumination can cause the same light impinging on the eye (illustrated here for sets A, B, and D). Furthermore, in order to choose between sets, each percept has to be memorized at time Inline graphic and retained while scrutinizing the other sets, posing a short-term memory demand.