When using the method of adjustment to measure the difference threshold, the observer

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The method of adjustment is a psychophysical method used to measure the difference threshold, which is the smallest difference between two stimuli that can be detected. In the method of adjustment, the observer is presented with a standard stimulus and a comparison stimulus. The observer then adjusts the comparison stimulus until it is just noticeably different from the standard stimulus. The difference between the comparison stimulus and the standard stimulus is the difference threshold.

When Using the Method of Adjustment to Measure the Difference