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.

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.

so you know what happened be fore you were alive

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