display, size, performance
The smallest display while indistinguishable from the larger three displays in the 3000 ms condition has significant accuracy diminution in the 700 ms and 300 ms conditions when compared to the three larger displays. Understanding the effects of the visual display size of a task on human performance has long been a goal of research in the United States Military. The present work is a series of three studies which focus on distinguishing which specific aspects of display size each affect performance response capacity. The three sequential studies represented here manipulated viewing conditions and task type. These studies were derived from a code substitution cognitive battery using four display sizes and three viewing conditions. The first viewing condition is controlled distance to the display. The second viewing condition allowed the participants to choose their own viewing distance. Free movement, the second viewing condition, provided the data for the third viewing condition where the participant was held to a constant visual angle and changing distance. In summary the three sequential experiments are free movement to and from the display, controlled distance to the display, and controlled visual angle while changing display distance. The four display sizes were in part selected in association with SME's from UCF and the United States Army (PDA--320x280, Tablet--800x600, Small - LCD 1280x1024, Large LCD--1600x1200). These four displays are representative of the four display sizes widely used by our armed forces. Three workload levels were manipulated by restricting the viewing time to 300ms on target at the shortest interval through 700ms on target, to finally 3000ms on target. The 3000ms represents the standard amount of time used in a code substitution task, while 700ms and 300ms are present as a result of the pilot studies and thus representing higher workloads. Results indicate all displays sizes suffered performance diminution in the 700 ms and 300 ms condition. The three largest displays had indistinguishable performance results.
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Doctor of Philosophy (Ph.D.)
College of Sciences
Length of Campus-only Access
Doctoral Dissertation (Open Access)
Stafford, Shawn, "The Effects Of Screen Size On Performance Of A Modified Code Substitution Task" (2009). Electronic Theses and Dissertations. 3957.