In one experiment, preschool children judged french fries as tasting better when served in a McDonald's bag rather than a plain white bag. This best illustrates the impact of

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The experiment with preschoolers illustrates the impact of perceptual set, which is a mental tendency to perceive stimuli in a particular way based on previous experiences or expectations. In this case, the children likely associated McDonald's with positive experiences and therefore perceived the french fries as tasting better when served in the McDonald's bag.

In One Experiment, Preschool Children Judged French Fries as Tasting