Cog is a project at the Humanoid Robotics Group of the Massachusetts Institute of Technology. It is based on the hypothesis that human-level intelligence requires gaining experience from interacting with humans, like human infants do. This in turn requires many interactions with humans over a long period of time. Because Cog's behavior responds to what humans would consider appropriate and socially salient environmental stimuli, the robot is expected to act more human. This behavior also provides the robot with a better context for deciphering and imitating human behavior. This is intended to allow the robot to learn socially, as humans do. (wikipedia)