This demonstration allows to experience and measure a shift from food acceptance to food rejection, based on the phenomenon of contamination sensitivity to disgusting substances. Students rate the desirability of a snack, which is then progressively contaminated by contact with, human residues. Repeated measurements, show progressive contamination. The students' ratings reveal quick and statistically reliable shifts from accepting (Liking) to rejecting (disliking) the snack. This exercise generates meaningful data sets and is recommended for several courses.
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