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Centre for Policy on Ageing | |
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| Effects of similarity and duration on age differences in visual search | | Author(s) | Charles T Scialfa, Lisa L Harpur |
| Journal title | Canadian Journal on Aging, vol 13, no 1, Spring 1994 |
| Pages | pp 51-65 |
| Keywords | Mental speed ; Visual impairment ; Young adults [20-25] ; Age groups [elderly] ; Canada. |
| Annotation | The visual search task, in one form or other, has been used frequently in gerontology, both as a means of describing age-related differences in search performance, and as an attempt to isolate the mechanisms or processes for the age differences obtained. In this Canadian study, young and old observers performed a feature search task in which a single target was embedded in five distractors. Target-distractor similarity was varied quantitatively (along the feature dimension of orientation); display duration ranged from approximately 50-400 ms. Identification accuracy was worse on target-absence trials, particularly when distractor similarity was high and display duration brief. An age X duration interaction on accuracy was found to reflect generalised age deficits in sensitivity and duration-dependent age differences in bias. Results suggest that an age deficit in the rate of information extraction produces a greater dependence for older people on partial information gained from distraction. Additionally, the additive effects of age and similarity have implications for visual search tasks where display size is varied. (RH). |
| Accession Number | CPA-970821225 A |
| Classmark | DG: BR: SD6: BB: 7S |
Data © Centre for Policy on Ageing |
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| ...from the Ageinfo database published by Centre for Policy on Ageing. |
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