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Unformatted text preview: Septermber 23, 2008 - Psychology 1101 G Outline – Perception 2 ****This lecture covers Gleitman Chapter 5*** (Omit feature net models and the neuroscience approach.) What is it? Features (X’s and O’s demo) How do Hubel’s and Wiesel’ simple feature detector cells help us to recognize objects? Parallel search You are searching everything at the same time. Conjunctive visual search You need to join at least 2 separate features. This search is serial- you look at each item until you find what you are looking for. Feature integration theory (FIT – Anne Treisman) Describes processing of visual stimuli into information Two-stage process: 1. Preattentive stage 2. Focused attention stage Preattentive stage (before attending) Bottom-up (reflects), automatic Extracts primitive features Parallel processing of all elements of a display Some features “pop out” e.g. color, orientation, etc Focused attention stage Not instantaneous Requires effort and conscious scrutiny Often requires serial search to examine all elements of a display For conjunctive searches, this stage is required to “bind” the separate features into a meaningful percept...
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- Spring '07
- Psychology, Feature integration theory, size Shape constancy, Size constancy Objects, constancy Constancy, presentation Perceptual primitives