Answer:
Psychophysics.
Step-by-step explanation:
As the exercise briefly details, Psychophysics study the relationship between the physical properties of a stimulus and the observers' perception of the stimulus. It's the scientific study of a stimuli and the perception that an individual feels from the reaction to that stimuli. It's a stimulus-response study: psychophysics investigates how much of a stimuli we can detect. For example, when you feel a fabric why is it different from a watermelon? The texture, the smell, even taste. That's what psychophysics study, the perception of the stimuli.