PS101 Lecture Notes - Lecture 4: Opponent Process, Hearing Loss
Document Summary
About the demonstration: sensation gives us the visual cues, perception fills in the blanks. So what can we sense: how much stimulation has to be out there before we can detect that it is there, thresholds. Absolute threshold difference between not perceiving a stimulus and being able to just barely perceive it: the smallest amount of stimulation necessary for you to be able to detect. Difference threshold: the smallest increase or decrease in a stimulus that is required to produce the just noticeable difference (jnd) Just noticeable difference: weber fraction, amount of increase needed to make a difference. If you are carrying 2kg, 1 additional gram will not make a difference. If you carry only 20 grams, 1 gram will make a difference. Jnd in the real world: radiology example. The flaw with these classic measures: focus on the physical stimulus. October 30, 2014: signal detection theory matrix.
