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SUMMARY:Journal Club "Searching for memories\, Sudoku\, implicit check-bit
 s\, and the iterative use of not-always-correct rapid neural computation" 
 - Philip Sterne
DTSTART:20061117T123000Z
DTEND:20061117T133000Z
UID:TALK5926@talks.cam.ac.uk
CONTACT:Oliver Stegle
DESCRIPTION:\nhttp://arxiv.org/abs/q-bio.NC/0609006\n\nSearching for memor
 ies\, Sudoku\, implicit check-bits\, and the iterative \nuse of not-always
 -correct rapid neural computation\nBy John Hopfield\nAbstract:\n\nThe algo
 rithms that simple feedback neural circuits representing a brain \narea ca
 n rapidly carry out are often adequate to solve only easy \nproblems\, and
  for more difficult problems can return incorrect answers. \nA new excitat
 ory-inhibitory circuit model of associative memory displays \nthe common h
 uman problem of failing to rapidly find a memory when only a \nsmall clue 
 is present. The memory model and a related computational \nnetwork for sol
 ving Sudoku puzzles produce answers that contain implicit \ncheck-bits in 
 the representation of information across neurons\, allowing \na rapid eval
 uation of whether the putative answer is correct or \nincorrect through a 
 computation related to visual 'pop-out'. This fact \nmay account for our s
 trong psychological feeling of right or wrong when \nwe retrieve a nominal
  memory from a minimal clue. This information \nallows more difficult comp
 utations or memory retrievals to be done in a \nserial fashion by using th
 e fast but limited capabilities of a \ncomputational module multiple times
 . The mathematics of the \nexcitatory-inhibitory circuits for associative 
 memory and for Sudoku\, \nboth of which are understood in terms of 'energy
 ' or Lyapunov functions\, \nis described in detail.\n\n\nIt's quite a long
  (but mainly informal) paper\, I'll only really be \ninterested in discuss
 ing the first 28 pages (not the Sudoku section).\n
LOCATION:Room 911\, Rutherford Building\, Cavendish Laboratory\, Departmen
 t of Physics
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