PS260 Lecture Notes - Lecture 5: Outline Of Object Recognition, Prosopagnosia, Visual Perception
Document Summary
Mcclelland and rumelhart"s (1981) model of word recognition included two additions: Top-down connections from words to letters and letters to features. Similar feature nets may underlie our perception of objects. Beetterman-the recognition by components (rbc) model includes an intermediate layer that is sensitive to geons (46), basic shapes proposed as the building blocks for all three-dimensional forms. One piece of evidence supporting the representation of geons is that perceptually degraded pictures are better recognized if geons are preserved. The object-superiority effect is analogous to the word-superiority effect. Lines are perceived more accurately if presented in the context of an object. A geon is recognize faster in a context of an object. Models of object recognition differ on whether object recognition depends on viewpoint. In the recognition by components model, geons result in viewpoint-independent recognition. Other proposals are viewpoint-dependent, requiring the remembered representation to be rotated into alignment with the current view.
