sentences:  The skilled and the unskilled have quite different ranges for sight reading the same music.On the other hand, a faster tempo may minimise excess capacity in the skilled, but will tend to induce inaccurate performance in the unskilled; inaccuracies rob us of the only evidence that a performer has processed the information on the page, and the danger cannot be discounted that feedback from action-slips contaminates eye movement data.Almost all studies have compared temporal variables among participants, chiefly the durations of their fixations and saccades.