British neuroscientist who developed a computational theory of visual perception and proposed the influential three-levels framework — computational, algorithmic, and implementational — for analyzing cognitive systems.
Three levels: (1) computational — what is the system doing and why; (2) algorithmic — how does it do it, what representations and procedures; (3) implementational — how is it physically realized. Vision: the visual system computes a primal sketch, 2.5D sketch, and 3D model representation from retinal images.
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