Mary Beth was eating some cookies and she thought she could detect a faint taste of cinnamon in the cookies. However, when she took another bite the taste wasn't there. On the third bite she could just make out the taste of cinnamon again. Based on research conducted by psychophysicists, you should conclude that the amount of cinnamon in the cookies was:

The cinnamon flavor that Mary Beth felt was due to an amount of cinnamon placed on the cookies that was only enough to reach her absolute threshold for taste.

Explanation:

Absolute threshold is a very recurrent term in psychophysics to describe a situation where a factor is induced in minimal amounts to cause a stimulus, a sensation that is received by the brain with low intensity, but it is not lost on it.

In the question above, we can see that Mary Beth felt a slight cinnamon flavor in her cookies. The taste was not strong and well defined, but she could feel it in some bites and not in others. This means that the amount of cinnamon placed on the biscuit was the minimum amount capable of provoking a sensation of cinnamon flavor, but a weak and ill-defined sensation.

Just at her absolute threshold for taste

Explanation:

Psychophysics is defined as the scientific study of the relation between stimulus and sensation and perceptions evoked by these stimuli.

Absolute threshold is the smallest energy level that an external stimulus needs to be measurable by the human senses.

Mary Beth was eating some cookies and she thought she could detect a faint taste of cinnamon in the cookies, but it was on the third bite that she could just make out the taste of cinnamon again this reflects her absolute threshold for taste.