Given the state of computing power, this might happen first:<p><pre><code>  Become skilled at transplanting rat brains.
  Raise identical twin rats.
  Train one rat to run a maze.
  Sacrifice the maze-running rat.
  Stabilize its brain and scan it at high resolution.
  Use an organ printer to create a duplicate of the rat brain from the scan.
  Transplant the new brain into the living twin.
  Put the chimera rat in the maze.
  Observe the result.
  Laugh maniacally.</code></pre>