What is the purpose of the method of constant stimuli?

The method of constant stimuli is a psychophysical technique used to measure sensory thresholds and perceptual capabilities. The primary purpose of this method is to minimize bias during testing. By presenting a range of stimulus levels in random order rather than in a predictable sequence, it reduces the impact of expectations or anticipations that the participant may have regarding the stimuli. This randomness helps ensure that the response observed is purely based on the sensory perception of the stimuli rather than influenced by learned patterns or anticipatory responses.

This method is particularly effective because it allows for the establishment of a reliable threshold by accounting for the variability in responses that may arise from factors unrelated to the actual perception of the stimulus. Thus, using this method leads to more accurate and consistent measurement of a participant's sensory thresholds, providing a clearer picture of their perceptual abilities.