Nagy A L, Sanchez R R
Psychology Department, Wright State University, Dayton, OH 45435.
Hum Factors. 1992 Oct;34(5):601-14. doi: 10.1177/001872089203400507.
Visual search times were measured as a function of chromaticity and luminance differences between a target and distractor stimuli. Results showed that mean search time increased linearly with the number of distractors if the luminance difference between target and distractors was small but was roughly constant if the luminance difference was large. Similar results were previously found for chromaticity differences. With the number of distractor stimuli held constant, the mean search time decreased with increases in the difference between target and distractors, up to some critical difference. Further increases in target-distractor difference had little effect. Results were similar for targets defined by luminance and chromaticity. There was some advantage to combining luminance differences with chromaticity differences when the target was dimmer than the distractors. Generally there was no advantage for combining a chromaticity difference with a luminance difference when the target was brighter than the distractors.
视觉搜索时间是作为目标刺激与干扰刺激之间色度和亮度差异的函数来测量的。结果表明，如果目标与干扰物之间的亮度差异较小，平均搜索时间会随着干扰物数量的增加而线性增加；但如果亮度差异较大，平均搜索时间则大致保持不变。先前对于色度差异也发现了类似的结果。在干扰刺激数量保持不变的情况下，平均搜索时间随着目标与干扰物之间差异的增加而减少，直至达到某个临界差异。目标 - 干扰物差异的进一步增加影响不大。对于由亮度和色度定义的目标，结果类似。当目标比干扰物暗时，将亮度差异与色度差异相结合具有一定优势。一般来说，当目标比干扰物亮时，将色度差异与亮度差异相结合没有优势。
