Advances in Visual Perception PSYC 526 Fall Profs

Advances in Visual Perception PSYC 526 Fall Profs. Fred Kingdom & Kathy Mullen

Lecture 2 “Seeing Patterns” Reading Goldstein, Ch. 3 Frisby, Ch. 4 “After-effects-The Psychophysicist’s Microelectrode” (in course pack)

Scale

Effects of bandpass filtering Unfiltered Lowpass filtered Highpass filtered

Sinewave grating. Sine

Copyright © 2002 Wadsworth Group. Wadsworth is an imprint of the Wadsworth Group, a division of Thomson Learning Fig. B 2 Appendix, page 592 Fourier components of a square wave

High contrast Contrast Medium contrast Low contrast

Viewing angle

Spatial frequency (SF) Low SF Medium SF High SF

Copyright © 2002 Wadsworth Group. Wadsworth is an imprint of the Wadsworth Group, a division of Thomson Learning Figure 15. 11, page 517 Baby’s perception of mother’s face

Tilt aftereffect

Simultaneous tilt contrast

Copyright © 2002 Wadsworth Group. Wadsworth is an imprint of the Wadsworth Group, a division of Thomson Learning Spatial frequency after-effect

Curvature after-effect

Colour after-effect

Mc. Collough effect

Response strength Principle of univariance I Response of a single neuron Stimuli with different orientations

Response strength Principle of univariance II patterns of response across neurons Neurons with different preferred orientations

Response strength Bandwidth I narrow broad Stimuli with different orientations

Response strength Bandwidth II Stimuli with different orientations

Response strength Bandwidth III Stimuli with different orientations