The human motor cortex and action sequence learning by observation

How do people learn to perform new actions through observation? Does it involve the immediate formation of a new motor representation of the action, or is more abstract thought, such as mentally rehearsing spoken instructions, involved in learning the new action? This study aims to answer these questions by examining how the rolandic Mu rhythm (8-14 Hz), found in the human electro-encephalogram, is influenced by action sequence learning by observation