Katie notices there is a new barista at her favorite coffee shop. she also notices that her vanilla latte tastes just slightly sweeter than usual. the taste is right at the threshold.

The right answer is difference threshold.

The differential threshold is defined as the minimum amount in which something changes so that someone notices a difference in 50% of the time. This concept applies to all the senses: hearing, touch, smell, taste, and vision. The change must be perceived before the stimulus reacts to it. In this example, the change of the barista who makes the coffee makes Katie notice the difference in taste.

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Difference

Explanation:

The difference threshold, also known as the "just noticeable difference" is the amount that must be changed for a difference to be noticeable at least 50% of the time. Therefore, although the difference is still very small, a person is able to recognize it most of the time. In this case, Katie notices a small change in the sweetness of her latte due to the change in barista. Because the difference is barely perceptible, it is right at the difference threshold.

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