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Although it has been amply demonstrated that eye movements are influenced by the presence of complex information in visual displays , the nature of the control of this behavior remains unclear. Because of the brevity of the eye fixations, a major theoretical dispute has arisen over whether the eyes are guided to new fixation positions immediately, on the basis of information glimpsed during the immediately preceding fixation, or on a delayed basis , because new information is not available early enough in a fixation to influence the direction of the next eye movement