 The approach revived ideas from cybernetics and control theory that had been unpopular since the sixties . Another precursor was David Marr , who had come to MIT in the late 70s from a successful background in theoretical neuroscience to lead the group studying vision . He rejected all symbolic approaches ( both McCarthy 's logic and Minsky 's frames ) , arguing that AI needed to understand the physical machinery of vision from the bottom up before any symbolic processing took place . ( Marr 's work would be cut short by leukemia in 1980 . ) 
 The approach revived ideas from cybernetics and control theory <a href='null_relcl' title='1'><mark>that</mark></a>had been unpopular since the sixties . Another precursor was David Marr , <a href='null_relcl' title='2'><mark>who</mark></a><a href='been_done' title='3'><mark>had</mark></a> come to MIT in the late 70s from a successful background in theoretical neuroscience to lead the group studying vision . He rejected all symbolic approaches ( both McCarthy <a href='null_genetive' title='4'><mark>'s</mark></a>logic and Minsky <a href='null_genetive' title='5'><mark>'s</mark></a>frames ) , arguing that AI needed to understand the physical machinery of vision from the bottom up before any symbolic processing took place . ( Marr <a href='null_genetive' title='6'><mark>'s</mark></a>work would be cut short by leukemia in 1980 . ) 
The approach revived ideas from cybernetics and control theory had been unpopular since da sixties . Another precursor was David Marr , done cum to MIT in the late 70s from a successful background in theoretical neuroscience to lead tdagroup studying vision . He rejected alll symbolic approaches ( both McCarthy  logic and Minsky  frames ) , arguin that AI needed to understand thdahysical machinery of vision from the bottom up b4 any symbolic processing took place . ( Marr  work would be cut short by leukemia in 1980 . )