The side sticks are electronically monitored for position, and the output to the flight surface is the result of the "sum" of the left and right side sticks. This means that if the left side stick is selected a given amount to right wing down (as an example), and the right side stick is selected the same amount of deflection to left wing down, the output to the flight controls is neutral. In the event of a failure or emergency, either side stick may be overridden to allow the summing to be terminated.