Dr. Argonaut presents a blindfolded subject with a sweet liquid and then adds a drop of sweetener to the liquid. The subject tastes it after each addition. This process continues until the subject tells the researcher that the liquid tastes "sweeter." Regarding the sense of taste, Dr. Argonaut is seeking the __________ threshold.

Dr. Argonaut in the scenario is identifying the 'difference threshold' of the subject. This is the minimum change in sweetness (added through sweetener) that must occur for the subject to detect a difference in taste from the original liquid.

Explanation:

In the context of this question, Dr. Argonaut is seeking to identify the difference threshold in the subject's sense of taste. The difference threshold is also known as the Just Noticeable Difference (JND), which is the amount of change in a stimulus necessary for a person to detect that the change has occurred. In this specific scenario, it is the minimum amount of sweetener that must be added to the liquid before the subject can detect a difference in sweetness.

To illustrate further, when the subject first tastes the liquid, they have a baseline perception of its sweetness. With each additional drop of sweetener, the sweetness of the liquid changes slightly. When the change in sweetness becomes noticeable to the subject, the difference from the original sweetness is known as the difference threshold in this instance.

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