PS260 Lecture Notes - Object Model, Fusiform Face Area, Prosopagnosia

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17 Mar 2022
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Descendants of the feature net: the mcclelland & rumelhart model. Emphasizes the role of inhibitory connections among detectors. Information flows bottom-up, top-down, and within the same level. Higher-level word detectors can influence lower-level detectors. Excitatory connections (red arrows) allow one detector to activate its neighbors. Inhibitory connections (black lines with dots) allow detectors to inhibit their neighbors. E. g. , activation of the trip detector will inhibit the detectors for. Descendants of the feature net: the rbc model. Applies the feature net model to recognition of three-dimensional objects. Similar feature nets may underlie our perception of objects. Includes an intermediate level of detectors that is sensitive to geons, basic shapes (cylinders, cones, squares, etc. ) proposed as the building blocks for all 3d forms. According to the rbc model, there are 30 geons to describe any object in the world (just like we need only 26 letters in the alphabet to spell all english words).

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