The Obama initiative is markedly different from a recently 
  announced European project that will invest 1 billion euros 
  in a Swiss-led effort to build a silicon-based “brain.” The 
  project seeks to construct a supercomputer simulation using 
  the best research about the inner workings of the brain.

  Critics, however, say the simulation will be built on 
  knowledge that is still theoretical, incomplete or 
  inaccurate.