Three levels of description (David Marr, 1982)

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Presentation transcript:

Three levels of description (David Marr, 1982) Computational Why do things work the way they do? What is the goal of the computation? What are the unifying principles? Arithmetic: a + b = c Algorthmic What representations can implement such computations? How does the choice of representations determine the algorithm? 00001000110101+ 00001000010100= 00010001001001 Implementational How can such a system be built in hardware? How can neurons carry out the computations?

Three levels of description (David Marr, 1982) Computational Why do things work the way they do? What is the goal of the computation? What are the unifying principles? maximize: Algorthmic What representations can implement such computations? How does the choice of representations determine the algorithm? ut ut+1 ut+2 ut+3 xt xt+1 xt+2 xt+3 rt rt+1 rt+2 rt+3 yt yt+1 yt+2 yt+3 Implementational How can such a system be built in hardware? How can neurons carry out the computations?