Questions On The Checker Shadow Illusion - 1442 Words

Introduction to Cognitive Science, 2014 Homework 2 4 questions, 33 points total Name: Josh Jordan Question 1 (4 points): The Checker-Shadow Illusion (8 points) View the illusion available at http://color.psych.upenn.edu/homework/CheckerShadow.jpg. This is called the checker-shadow illusion and is due to Edward Adelson. a) (2 points) What is the illusion? That is, how does your perception of squares A and B differ from what is objectively on the screen/paper? You may want to print out the image and use scissors to compare the checks at A and B when they are placed next to each other.† Objectively, squares A and B are the same color, but viewers perceive square B as be-ing lighter than square A. â€Å"b) (2 points) Why (at the computational level) might we experience this illu-sion/interpretation? What implicit assumption about the world is made by your brain? What is a benefit of this illusion/interpretation?† Our brain assumes that a shadow will darken an object, so our brain corrects the shad-ing of the object under the shadow to make it lighter (light constancy). Our brain’s goal (at the computational level) is to view an object in the same way under different lighting. This way we perceive something under a shadow the same way we would perceive it if it wasn’t covered by a shadow. The assumption that our brain makes is that an object will appear differently under a shadow, but is still the same object. This is beneficial because it allows us to perceive objectsShow MoreRelatedThe Plausible Theory Of Perception Direct Realism Or Indirect Realism?1998 Words   |  8 Pagesthe room). The problem of perception arises from the existence of phenomenom such as hallucinations, illusions, perceptual relativity (the idea that two people may experience an object in entirely different ways), and dreams. 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