PSY100Y5 Lecture Notes - Lecture 1: Ames Room, Afterimage, Absolute Threshold

• School: UTM
• Department: Psychology
• Course: PSY100Y5
• Professor: Dax Urbszat

Document Summary

Perception: selection, organization, and interpretation of sensory input. Psychophysics: how physical stimuli are translated into psychological experience. Fechner: the concept of the threshold (there is no real absolute threshold so ) Absolute threshold: where the stimulus is detected 50% of the time. Weber"s law = size of jnd proportional to size of initial stimulus. Psychophysical scaling: fechner"s law = size of perceptual experience is proportional to the number of jnd"s that the stimulus is above the absolute threshold. Signal-detection theory: sensory processes (sensitivity) + decision processes (bias) Reversible figures and perceptual sets demonstrate that the same visual stimulus can result in very different perceptions. Optical illusions - discrepancy between visual appearance and physical reality. Famous optical illusions: muller-lyer illusion, ponzo illusion, poggendorf illusion, Upside-down t illusion, zollner illusion, the ames room, and impossible figures. Today"s experiment is designed to demonstrate the muller-lyer illusion and to show how we can measure the size of a subjective experience using the method of.