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Psychology Mrs. Debra Homework Assignment 8/7/2014 According to Weber’s Law; Just noticeable difference is a personal determination rather than a matter of psychophysics. Just noticeable difference is a constant. Just noticeable difference can be equated with absolute threshold. Just noticeable difference is a constant proportion of the intensity of initial stimulus. Meditation resultant in an altered state of consciousness by; Reducing the activity level. Lowering the heart rate.