The absolute threshold is the:

A. decreasing sensitivity to a stimulus over time.

B. intensity of a stimulus that can be detected in the presence of noise.

C. minimal intensity needed to just barely detect a stimulus.

D. minimal change in a stimulus that can just barely be detected.

C. minimal intensity needed to just barely detect a stimulus.

Explanation:

Absolute threshold is one of the most important terms in psychophysics and refers to the minimum threshold for a stimulus to cause a sensation.

In other words, the absolute threshold is the minimum amount of energy for a stimulus to be detected in at least 50% of attempts. The higher the absolute threshold, the lower the sensitivity to stimuli.