PSY-3215 Lecture Notes - Lecture 3: Low-Density Lipoprotein
Document Summary
Range of stimuli - different weights / more heavy to less heavy. One stimulus is the standard and the rest are comparison stimuli. Forced choice - standard versus comparison stimuli. Use the same body part (sequential) to account for varying sensitivity. Plot the psychophysical function for the task & interpret. Physical intensity on x-axis (weight in grams) Point of subjective equality: point that is most similar to the standard stimulus / probability of saying heavier" is 50% Upper difference limen (udl): where the probability of saying heavier" is. Lower difference limen (ldl): where the probability of saying heavier" is. Interval of uncertainty (i of u): range between ldl and udl / udl - ldl. Just noticeable difference (jnd): i of u / 2. I = 100g / i = 2g / i/i = 0. 02. I = 200g / i = 4g / i/i = 0. 02. I = 50g / i = 1g / i/i = 0. 02.
