PSYC 212 Lecture Notes - Lecture 2: Alltrials, Supertaster, False Alarms (1936 Film)

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

Document Summary

So threshold = defined as sensory intensity at which stimulus is detected 50% of time. Ex: sound either hear or not should be sharp but reality not all or nothing. Ex: logistic s shape of probability of saying yes vs no & physical stimulus intensity. Because what we subjectively perceive = not 100% determined by. Signal present in environment but there is also noise in signal. Sources of noise = *many other factors can influence our response: attention fluctuates by, criterion for saying yes may, spontaneous activity in. Not all student raised hands at same time so some detected. Class threshold = would be moment 50% of students raised hands. *not when 1st / last person raised hand. Best way to quickly obtain most accurate threshold. 4 methods to detect threshold: method of constant stimuli b) methods of limits c) staircase method d) method of adjustment, method of constant stimuli. Several intensities= systematically tested in a random order.