I know nothing about it." "I expected that, but your mind carries an eidetic memory of the controls if it can be probed deeply enough – with a psychic probe." The chamberlain's ruddy face paled suddenly and sagged. The cards in his hand crumpled under sudden fist-pressure, "A psychic probe?" "You needn't worry," said the captain, sharply. "I know how to use one.
Asimov, Isaac
Foundation 2 - Foundation and Empire