molecular understanding of three-dimensional (3d) peptide: mhc models require both basic knowledge of computational modeling and skilled visual perception, which are not possessed by all students. the present model aims to simulate mhc molecular structure with the hands and make a profound impression on the students.

If one defines a visual front-end to be that part of a visual system in which the structure of the optical world is represented in some least committed form, then it is plausible to assert that it reflects the structural properties, notably symmetries, of the optical environment. We propose a methodology for constructing receptive field assemblies consistent with these symmetries, which contrib...

Three experiments on tachistoscopic perception of visual stimuli demonstrate that the visual system is sensitive to global topological properties. The results indicate that extraction of global topological properties is a basic factor in perceptual organization.