Marr, David (1945-80)

Marr was a British psychologist who made important contributions to the study of visual processing. In doing so, he integrated results from psychology, AI, and neurophysiology. His classic book, Vision: A computational investigation into the human representation and processing of visual information, is considered one of the most important works in cognitive science. In addition to his work on vision, Marr developed a general account of information-processing systems in terms of three levels of analysis: (1) the level of computational theory of the system, (2) the level of algorithm and representation, which are used make computations, and (3) the level of implementation: the underlying hardware or "machinery" on which the computations are carried out.

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