Executive Systems Responsible for Visually Guided Movement

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A fixation is an eye movement variable that gives insight as to about the dynamics of where and how many times a subject acquires visual information. In a study by Ditchburn (1973) found that visual sensitivity declines during saccades because when the saccade is taking place the eyes move quickly and are therefore not able to foveate on specific areas. Theoretically, the greater the number of fixations, the more saccades the eyes will have to produce. Therefore a search strategy that involves fewer fixations is assumed to be more effective (Williams et al. 1999, Mann, Williams, Ward & Janelle 2007) as less time is spent in saccadic eye movement where individuals are not able to use the information in the display. The proposal that experts produce significantly fewer fixations than novices is supported by Bard and Fleury (1976), Helsen and Pauwels (1992, 1993), Moreno et al. (2002), Ripoll et al. (1995), Singer, Cauraugh, Chen, Steinberg and Frelich and (1996); Vickers (1996) and Savelsberg, Williams, Van Der Kamp & Ward (2002). On the other hand a number of studies have found th...

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