PSYCH 2H03 Lecture Notes - Lecture 3: Color Constancy, Mach Bands, Ebbinghaus Illusion

• School: McMaster University
• Department: Psychology
• Course: PSYCH 2H03
• Professor: Karin R Humphreys

Document Summary

We don"t see the world in pixels we see them in objects. When a stimulus projects on the retina- gives two dimensional representation with different light and color intensities. Our perception goes far beyond the information we are given. We see there world in terms of objects. However the image you receive in your brain is not an object. And therefore a lot of work and processing and assumptions need to be made by our perceptual system to form an image. Most visual processing occurs in the occipital lobe. When cells are exposed to a visual stimulus , they may activate, however they may also experience lateral inhibition. That is cells like to turn off their neighbors. Cell a will most likely activate because the only cell next to it is cell b, Mark bands- edges may seem well defined but bars are the same shade all across- Edge enhancement in mark band task is due to lateral inhibition.