Max Planck Institute for Biological Cybernetics, Tübingen, Germany.|Max Planck Institute for Biological Cybernetics, Tübingen, Germany.|Max Planck Institute for Biological Cybernetics, Tübingen, Germany.|Max Planck Institute for Biological Cybernetics, Tübingen, Germany.|Max Planck Institute for Biological Cybernetics, Tübingen, Germany.