Causes of Simultaneous Keystrokes in Children and Adults

Simultaneously pressing two keys on a keyboard (Zero Time keystrokes) is a unique typing occurrence. To understand the cause of Zero Time keystrokes, typing data were collected from young children and undergraduate computing students. The results show that, in both students and children, the most frequent cause of Zero Time keystrokes were errors in aiming for the intended key, resulting in the intended and an adjacent key being pressed together. The second most frequent errors were Transposition Errors, which were errors in the ordering of the intended two letters.