Week 4 Part 3 Notes: Sensation and Perception
Week 4 Part 3 Notes: Sensation and Perception PSYCH 1101
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This 2 page Class Notes was uploaded by Chandler Notetaker on Friday September 16, 2016. The Class Notes belongs to PSYCH 1101 at Cornell University taught by Pizarro, D in Fall 2016. Since its upload, it has received 28 views. For similar materials see Introduction to Psychology in Psychology at Cornell University.
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Date Created: 09/16/16
Week #4 (Sensation and Perception Pt 2.) 9/16/16: ❖ Perception is a difficult problem ➢ The mind uses tricks in order to make sense of life around you ➢ Visual perception: our mind makes certain assumptions about the environment to help us see accurately despite having limited data to work with ➢ If the brain is using rules, the general strategy is to come with visual stimuli to unmask the tricks (fool the system) to get a better sense for the rules it's using ➢ The table trick: Gives us insight on how the brain is trying to figure out ❖ Why? The Perception Uses Some simple Rules ➢ Shadows make surfaces darker ➢ When we see a surface in a shadow, we automatically assume it is lighter than it looks ❖ How Do we Determine What is an object? ➢ Proximity of objects makes the brain think there are groups of things rather than individual objects ➢ Similarity: Things that look alike next to things that are not similar makes the brain think there are two groups ➢ Closure: using cues to understand the closure of one shape compared to another put things together ➢ Your brain is contributing input of other images to make sense of life ➢ Good continuation: we use queues to use our natural environment to decrease the amount of possibilities that are actually present. ➢ Good form: Formation of images change how we perceive the overall shape ❖ Depth ➢ Depth perception: Could end up with people who ask: Is there a police standing on the corner or someone in your hair ❖ Binocular Depth Cues ➢ Binocular disparity images gcing different infor to each eye ➢ Convergence at close distances, how much your eye is crossed gives the brain info about depth, ❖ Monocular Depth Cues ➢ size: distant objects subtend smaller visual angles than near objects, grain, size, and motion parallax. ➢ Müller Lyer Illusion: ■ The perceptual psychologists have hypothesized that the top line looks longer because it also looks farther away ■ Specifically, the inward pointing arrows signify that the second line is closer to you and the outward pointing arrows the opposite case ➢ Ponzo illusion ■ Converging line: We perceive that the line that is further is longer away but both lines are the same length ❖ Sesnastionand perception give us internal representation of the world ❖ But How Accurate/ Objective Is it? ➢ Perception is not perfect ■ We are susceptible to illusions, that what we see can vary depending on other visual cues present ■ Visual context: surrounding lines, shadows ■ Also shaped by broader context expectations about what you're perceiving ■ E.g. interpretation if ambig figures ■ Ebbinghaus illusion: We are perceiving that a lot of things are smaller because the overall environment shows a comparison ● If the outside circles were not taken into account, all circles would be the same size because it is more direct. ➢ Magic is based on tricking the mind systems ❖ The McGurk Effect: An auditory Illusion because what you're seeing clashes with what you're hearing ❖ Eyesight overrides what we are hearing
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