PSYC 2220 Lecture Notes - Lecture 3: Mach Bands, Limulus, Optic Nerve

• School: York University
• Department: Psychology
• Course: PSYC 2220
• Professor: Laurie Wilcox

Document Summary

Lateral inhibition & perception: experiments with eye of limulus. Ommatidia allow recordings from a single receptor. Light shown into a single receptor leads to rapid firing. Adding light into neighboring receptors leads to reduced. Lateral inhibition & lightness perception: 3 lightness perception phenomena explained by lateral inhibition. Mach bands seeing spots at an intersection seeing borders more sharply. Simultaneous contrast seeing areas of different brightness due to adjacent areas. Hermann grid: people see an illusion of gray images in intersections of white areas, signals from bipolar cells cause effect. Receptors responding to white corridors send inhibiting signals to receptor at the intersection the lateral inhibition causes a reduced response which leads to the perception of grey. Lateral inhibition & simultaneous contrast: people see an illusion of changed brightness / color due to effect of. An area that is of the same physical intensity appears . Darker when surrounded by a lighter area.