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30 normal adult Ss viewed each of 30 color slides of real objects and places for as long as they wished. The stimuli had previously been rated on a 7-point scale of complexity and divided into 3 groups of 10 each representing 3 levels of complexity: high, low, and middle. The positive relationship between complexity and looking time previously found for other stimuli holds for realistic photographs as well.
Leckart et al. (Sun,) studied this question.
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