PS261 Lecture Notes - Lecture 2: Ebbinghaus Illusion, Herring Gull, Simple Features
Document Summary
Other illusions: stimulus completion, kanizsa triangle, theres none but we see one anyway, ebbinghaus illusion, which orange circle is larger, pigeons show the opposite effect to humans. Beak salience depends on : shape, colour, spot colour, spot location, the ideal" beak is a yellow stick with a red spot at the end. Psychophysical principles: sensory systems respond more intensely to more intense stimuli, perceptual systems habituate to stimuli, if the stimulus is presented repeatedly, you stop sensing it, stimuli are better perceived when they are more distinct from their background. Two theories of perception: signal detection theory, feature integration theory, some basic terms: stimulus dimensions (intensity, wavelength, motion), stimulus features (the values on the various stimulus" dimensions. Roc curves: the ideal criterion depends on the importance of being right (correct detection) relative to the cost of being wrong (false alarm)
