Chapter 2: Perceptual processes

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+ Feature analysis theory: a visual stimuli is composed of a small number of characteristics or components. We store a list of distinctive features for each letter for example R is identified as a vertical line a curved and a diagonal line. This is specific to letter recgnition

+Recognition-by-components thery ( for object recognition especially 3-D)

+Viewer-centered approach: this approach proposes that we store a small number of 3d objects rather than 1 dimensional objects.. er mentally rotate that image until it matches any object shape we have stored in our memory.