PSYB51H3 Lecture Notes - Lesion, Hemianopsia, Low Frequency
Document Summary
Perception and cognition lec 3 retina pathways lateral. Photoreceptors transform light into neural signals: passes on information. Many photoreceptors on one bipolar cell = convergeance: very low levels of light, has greater sensitivity lose information about spatial distribution lateral pathway. Horizontal cells: connect laterally, enhances contrast locally inhibit laterally, every cell in the retina is a processing unit, has hundreds of millions of processing units, while a computer only has a few processors at most. Spatial vision refers to our ability to resolve or discriminate spatially defined features. Natural scene statistics: why care about gratings: gutenberg"s printing press metaphor. China and korea had similar technology but no impact: this was less significant because in china and korea they write in characters, not letters. The simpler the alphabet, the simpler it is to recreate text. Visual images can be described/represented as compositions of simple elements. The brain can then create filters to represent what you are seeing.
