Cooperativity and 3-D Representation.
Abstract
Recent evidence indicates that the early stages in visual processing may be broken into several parallel streams that are specialized for the analysis of different visual attributes. A contour localization task showed that all attributes can contribute equally to border localization - no particular attribute dominated position decisions. The position decision appeared to be determined in a common representation. In contrast to this common analysis, a study of visual persistence showed that motion-defined shapes have a visual persistence which lasts longer than, and appears to be independent of, the persistence for luminance-defined shapes. Because of the involvement of motion, the site of the persistence phenomenon must be cortical. A series of experiments on transparency perception showed that transparency is analyzed rapidly (within 60 msec) and influences early levels of visual processing. We have also investigated the early stages that lead from the initial 2-D representation to object recognition. Visual priming studies have been completed which suggest that object recognition begins, not with the construction of a 3-D model, but with a crude match of 2-D views to internal prototypes. The prototype that has the best match then guides the construction of an internal 3-D model.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 25, 1992
- Accession Number
- ADA253015
Entities
People
- Patrick Cavanagh
Organizations
- Harvard University