L64 PNP 200 Lecture Notes - Lecture 6: 2.5D, Multiple Realizability, Task Analysis
8 Feb 2018
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10:13 am: marr"s & visual system, marr"s computational analysis of visual system. Two basic conclusions from his task analysis. The visual systems job is to provide a 3d representation of the visual environment that can serve as input to recognition and classification processes primarily information about shape of objects and their spatial distribution. This 3d representation is on an object-centered rather than viewer- centered frame of reference. Like how you can understand something is a chair from any angle: experimental evidence. Possibility of double dissociations between perceptual abilities and recognitional abilities. Double dissociations: can have one without the other and the other without the one. Right parietal lesions recognition abilities preserved, but problems in perceiving shapes fro unusual perspectives. Left parietal lesions- shape perception intact, but recognition and identification impaired. Suggested to marr that visual system provides input to recognition systems: theoretical considerations. Recognitional abilities are constant across changes in how things look to the perceiver due to:
