3.4. Bitterness and sournessBitterness, astringency, like increased as a function of the serv-ING position of the tannin samples (p < 0.001) (Fig. 3), and we ob-served, no differences in the palate cleansers ' abilities to preventbitterness from building up (cleanser-by-position interaction,F (25, 827) = 0.53, p = 0.97). Unlike with astringency, however, weobserved no differences among the palate cleansers in their abilityto facilitate bitterness discrimination (cleanser-by-concentration handinteraction, F (5, 828) = 1.70, p = 0.13).The sourness of the acids samples increased by serving position(p < 0.001) (Fig. 3), and buildup was not affected by the cleansertype (cleanser-by-position interaction, F (25, 758) = 0.70, p = 0.86).At high levels, sourness cleansing with the milk diminished sensitivitycompared to all other cleansers (all p-values from contrasts withincleanser-by-concentration hand interaction < 0.04) (Fig. 2d).
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