Alex and the robot are in a room. The robot is located in front of him. Alex has been sitting for a long time and now he needs to get up and walk. In the condition without perceptual-crossing, the robot stands in front of the person without doing anything. When the person stands up, it remains in the same position. In the condition with perceptual-crossing, the robot anticipates or provokes action from the person. The robot somehow blocks the way for the person but when the person initiates to get out, the robot will make way. This initiation of movement also lies with the robot.