PSYB51H3 Lecture Notes - Lecture 3: Homonymous Hemianopsia, Visual Acuity, Optic Chiasm
Document Summary
Spatial vision: refers to our ability to resolve or discriminate spatially defined features. Gutenberg invented a printing press with movable types. Huge impact on 15th century europe (1424 cambridge 122 books!) Similar technology in ancient china & korea had no comparable impact. Text can be pieced together from a small set of simple and independent (non-redundant) elements. Similarly, visual images can be described/represented as compositions of simple and independent elements. Each of these elements can be filtered out separately. Bell & sejnovski (1996) used independent component analysis (ica) to identify the components of photos of natural images found the components to be edges and lines (i. e. , pieces of gratings). The visual system is plastic (evolution & learning: we should expect: . A certain specialization of the visual system for gratings and spatial frequencies. Filters specialized for edges and lines of various orientations. Sine wave gratings & gabors as building blocks of vision (&
