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Human Factors: The Journal of the Human Factors and Ergonomics Society
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Relationships Among Display Features, Eye Movement Characteristics, and Reaction Time in Visual Search

Atsuo Murata

Hiroshima City University, Hiroshima, Japan

Nobuyasu Furukawa

Hiroshima City University, Hiroshima, Japan

The relative contribution of number of fixations and fixation duration to reaction time in visual search was investigated. Ten participants (age 20--24 years) took part in each of two experiments. In Experiment 1, the experimental factors were display type (icon and file name), organization (arrangements with and without grouping), and number of stimuli presented (4, 8, and 16). In Experiment 2, a search task for a target stimulus (three prespecified random letters) was conducted, and the experimental factor was the display's layout complexity. Multiple regression analysis was used to examine whether reaction time was explained by a mediational model in which reaction time is mediated by eye movements and display features are not directly related to reaction time. The mediational model was not supported, and the effects of display features on reaction time were not attributable solely to eye movements. The interaction between number of fixations and fixation duration was also explored as a function of display features. As the display feature changed and the task became more difficult, the contribution of the number of fixations to explain the variation in reaction time became dominant for both experiments. Potential applications include measurements of cognitive ability, eye muscle balance disorders, and binocular fusion ability.

Human Factors: The Journal of the Human Factors and Ergonomics Society, Vol. 47, No. 3, 598-612 (2005)
DOI: 10.1518/001872005774860032
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