Object_perception_and_recognition_1_

Object_perception_and_recognition_1_ - Higher-level...

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Unformatted text preview: Higher-level Perception Lecture Outline • Feature Analytic Approach – Pandemonium Model – Parallel Distributive (Interactive) Processing • Form (Shape) Perception – Elements of Form – Perceptual Segregation – Pattern Recognition – Geons (Recognition by Components) Higher-level Perception Organization of Incoming Input • Organizing principles help us to… – Identify a target in space based on the identifiable primitive feature – Establish the boundaries of an object (figure/ground) – Group similar elements that make up a single object • Organizing principles are used to recognize patterns 1. Bottom-up processing : • Sensory inputs are pieced together to gradually build a representation of an object 1. Top-down processing : • Sensory inputs activate an overall representation of an object • Feature detectors in the visual system – Low level (lines, receptive field, and direction of motion) – Mid level (combination of lower levels) – High level (whole object) • Feature detectors networked together (i.e., feature net ) to create object • Data driven model Pritchard Study Pritchard Study Top-down Processing • Beliefs, expectations, or pre-existing knowledge about the world drives perceptual process Perceiver actively involved • How an object is perceived depends on the perceiver • Novel item or focus on the details… bottom-up • Expectations bias interpretation… top- down Perceiver actively involved • How an object is perceived depends on the perceiver • Novel item or focus on the details… bottom-up • Expectations bias interpretation… top- down Perceiver actively involved • How an object is perceived depends on the perceiver • Novel item or focus on the details… bottom-up • Expectations bias interpretation… top- down Thoughts…...
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Object_perception_and_recognition_1_ - Higher-level...

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