Hedonic-scale preference tests were run with four types of meat. Each one compared two nonirradiated ("good") samples with two irradiated ("poor")samples. Three effects were demonstrated: a) position effect (the later samples in the series were rated lower) ; h) contrast effect (serving "good" samples first lowered the ratings for "poor" samples); and c) convergence effect (serving "poor" samples first lowered the ratings for "good" samples).Contrast and convergence effects were shown to be independent of position effect.
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