p192fig05.06 Bottom-up and top-down circuits between the LGN and cortical area V1.  The top-down circuits obey the ART Matching Rule for matching with bottom-up input patterns and focussing attention on expected critical features.<BR>||  Model V1-LGN circuits, version [1, 2].  retina -> LGN relay cells -> interneurons -> cortex [simple, endstopped] cells -> cortex complex cells