PSY 368 Lecture Notes - Lecture 20: Psy, Railways Act 1921

• School: Stony Brook University
• Department: Psychology
• Course: PSY 368
• Professor: Gregory Zelinsky

Document Summary

Stim on the photoreceptors is ambiguous: inverse projection problem. An image can result from an infinite number of objects. Objects often hidden/blurred in naturalistic environments: object occlusion. Occlusions remove parts and features from objects, making feature-matching difficult, yet can still recog occluded objects: blurred objects. Blurring also reduces the match b/w features and an object"s representation in memory, but we can still recognize blurred patterns. Objects look different from different viewpoints: viewpoint invariance. Ability to recog an obj regardless of viewpoint: changes in illumination. Some changes in lightness and color are due to object properties; others are due to changes in illumination (shadows) Perceptions are created by combining elements called sensations . Many sensations add up to create our perception of a face. Failure to structuralists to answer these questions prompted rise of gestalt psychology. Whole differs from the sum of its parts . Perception not built up from sensations, but result of perceptual organization: perceptual grouping.