PSYCH 2GG3 Lecture 2: Early Behaviourism: Early psyhophysics
Document Summary
The smallest increase or decrease in a physical stimulus that is required to produce the. Just noticeable difference (jnd) in sensation that is detectable 50% of the time. Tries to figure out how much more intensity you need to make the stimulus for a noticeable difference to occur. Has to do with the jnd : slight change that occurs. Psychophysicists tried to measure not only absolute thresholds but also what they called the differential threshold often referred to as the just noticeable difference (jnd). Jnd = the least amount of change in stimulation that would be noticeable. Max weber concluded that jnds are a constant proportion of a stimulus (i. e. , weber"s. Y axis : magnitude of change required to be noticeable (jnd) He said that if you increase intensity of stimulation (ex: amount of weight you are holding in your hand), then the magnitude of the change that is required (jnd) needs to be more.
