The purpose of this study was to learn about motor control systems through the study of speech. The experimental intervention that provided insight into the coordination of movement was to disrupt the movement of the jaw during the utterance of simple syllables. The two words chosen were similar but required very different coordination of the jaw, tongue, and the muscles of speech. This allowed the researchers to determine if the adjustments made when the jaw movement was disrupted were pre-programmed; or whether they were specific to the word being uttered.