Abstract
Taste panels made hedonic ratings of the sensory properties of four grades of sultanas, evaluated as two pairs (Experiment 1), three chicken casserole products (Experiment 2), and two cola drinks (Experiment 3). In each experiment, two modes of sample presentation were compared: single presentation, where panellists rated only one sample per session; and side‐by‐side presentation, where the samples were presented simultaneously. In Experiment 1, hedonic ratings from single presentation suggested there were no significant differences between grades, whereas the side‐by‐side presentation did indicate significant differences. This discrepancy between modes of presentation was not noted in Experiments 2 and 3. Selective operation of methodological bias in category rating might possibly account for the findings.

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