PSYC 212 Lecture Notes - Lecture 3: Logistic Function, Absolute Threshold, The Techniques

• School: McGill University
• Department: Psychology
• Course: PSYC 212
• Professor: Mathieu Roy

Document Summary

Difference threshold: smallest difference that you can perceive between 2 stimuli. Absolute threshold: smallest physical intensity you can perceive. From now on to illustrate the thresholding technique we will consider the absolute threshold but the principle is the same. We ask the person to say if the person hear something, yes or no. More no answers when the stimulus intensity is low and more yes answer when the stimulus intensity is high, The logistic function disregards the exception and will set the threshold line. , tries to model the pattern of yes and no response. The threshold was the point were we are at 50% probability of perceiving something. The techniques permit us to find the threshold of individual in the most accurate manner. Points that are very far from the threshold are non informative to determine the threshold. We want to get as close as possible from the threshold in the fastest way.