Following from overshoot and undershoot is clipping. This explains the persistence of the overshoot and undershoot. The normalized value of the overshoot or amplitude factor is 1.4. He wrote that humanity would overshoot Earth's carrying capacity, due to both overpopulation and overconsumption. Gyrocompasses usually have built-in damping to prevent overshoot when re-calibrating from sudden movement. A decline in population as a consequence of overshoot has been termed 'collapse'. This caused them to continually overshoot their corrections. The process of repolarization causes an overshoot in the potential of the cell. Dead spots are a result of the maximum overshoot requirement from above. A Corsair pursued the "kamikaze" and destroyed it after forcing it to overshoot the ship. This can also help an attacker to prevent an overshoot. See the section #Trend channel line overshoot. Rolling scissors, also called vertical scissors, tend to happen after a high-speed overshoot from above. Also see the definition of overshoot in a control theory context. Certain requirements for step response and overshoot are necessary for an acceptable TV image.