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Darryl G. Humphrey

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Publications by Darryl G. Humphrey (bibliography)

1995

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Humphrey, Darryl G., Kramer, Arthur F. and Schneider, Donnelle R. (1995): Visual Search and the Older Adult: Not All is Lost. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 134-138.

“Plude and Doussard-Roosevelt (1989) reported age-related search slope differences in a conjunction search task but not in a feature search task. According to Feature Integration Theory (Treisman&Gelade, 1980), older adults may suffer an impairment in the feature integration mechanism required for conjunction searches. We extend this work by examining age-related differences a series of feature, conjunction, and triple conjunction search tasks. The results of the feature and conjunction search tasks support the previous findings. However, the results of the triple conjunction search task suggest that the conjunction search impairment is not universal. As the triple conjunction search results are difficult to accommodate within Feature Integration Theory, the results are discussed within the framework of the Guided Search model of visual selective attention.”

1994

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Humphrey, Darryl G., Kramer, Arthur F. and Gore, Sheryl S. (1994): Perceptual Organization and Grouping Factors: Age Related Effects. In: Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting 1994. pp. 170-174.

“Older adults have evidenced a poorer ability to use grouping factors in such tasks as Embedded Figures, Incomplete Figures, and partial report. Difficulties in disambiguating the findings of these studies has left unanswered the cause of this age-related difference. By taking into account age-related differences in visual short-term memory, the results of the current study suggest that older adults maintain the ability to capitalize on the perceptual organization of the visual environment as a means of facilitating recall performance. These results have implications for the design of information displays, product labels, codes, and instructions.”

1990

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Merwin, David H., Dyre, Brian P., Humphrey, Darryl G., Grimes, John and Larish, John F. (1990): The Impact of Icons & Visual Effects on Learning Computer Databases. In: D., Woods, and E., Roth, (eds.) Proceedings of the Human Factors Society 34th Annual Meeting 1990, Santa Monica, USA. pp. 424-428.

“Improvements in computer graphics systems have made icons and visual effects available for use in designing database interfaces. However, little research has been reported about the impact of icons and visual effects on performance measures such as item selection time and recall of the databases. The present study examined the effect of icons and visual effects on item selection time and recall of a hierarchical database structure. Information in the database was represented by either a text label or a combined icon-text label. In addition, three types of visual effects during transition between menu screens were examined: instantaneous change, zoom open from the previous screen, and dissolve into the next screen. Both the item representation and screen transition manipulations were examined between subjects. Subjects were required to reach goals by selecting items from the various menus in the database. Processing time per menu screen and recall of the database were measured for each subject. Both the type of representation (icon-text vs. text alone) and the type of transition between menus (zoom, instantaneous change or dissolve) were found to affect subjects' ability to recall the structure of the database. Furthermore, no similar effects on item selection time were found for either manipulation. These results suggest that icons and visual effects can facilitate recall of hierarchical databases without increasing traversal time. In addition, the results suggest that indiscriminate use of some visual effects (dissolve) can impair learning of computer databases.”

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