You try a new potato chip and it tastes great, so you encourage a friend to try it. He tastes a new chip, then an old-style chip, and finally says that as far as he is concerned, all potato chips taste the same. The behavior of your friend is most similar to what might occur in a study of

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Difference thresholds, also known as just noticeable differences (JND), refer to the minimum difference in stimulation that a person can detect 50% of the time. Your friend's inability to distinguish between the new and old-style chips is akin to not perceiving a difference threshold between the two stimuli.  A difference threshold is the smallest physical difference between two stimuli that can still be recognized as a stimulus. To measure the difference threshold, pairs of stimuli are used. Participants are asked whether they think there is a difference or not.

You Try a New Potato Chip and It Tastes Great