A SENSORY EXPLANATION FOR VISUAL-ATTENTION DEFICITS IN THE ELDERLY

被引：17

作者：

STEINMAN, SB

STEINMAN, BA

TRICK, GL

LEHMKUHLE, S

机构：

[1] Departments of Ophthalmology, Neurobiology and Anatomy, Washington University School of Medicine, St. Louis, MO

[2] School of Optometry, University of Missouri-St. Louis, St. Louis, MO

[3] Department of Ophthalmology, Henry Ford Health Sciences Center, Detroit, MI

来源：

OPTOMETRY AND VISION SCIENCE | 1994年 / 71卷 / 12期

关键词：

VISUAL ATTENTION; AGING; PARALLEL PROCESSING;

D O I：

10.1097/00006324-199412000-00004

中图分类号：

R77 [眼科学];

学科分类号：

100212 ;

摘要：

Background. Reduced visual attention has been implicated as a major factor in age-related deficits of real-world functioning such as driving. However, the contribution of sensory factors to visual attention deficits has not been delineated. The magnocellular stream, which is diminished in aging, provides the dominant input to attention, and could provide a direct visual sensory explanation for these attentional losses. Methods. We measured temporal response curves for transient visual attention in older and younger subjects. Attentional cues stimulated both the magnocellular and parvocellular streams. Results. Older subjects exhibited slower, weaker responses than younger subjects. The time course in younger subjects agreed with that obtained for magnocellular(M)-biased stimuli, whereas that of older subjects agreed with parvocellular(P)-biased responses. Conclusions. The activation of transient visual attention is slower and weaker for elderly subjects, reflecting a reduced magnocellular input. This marks a primary visual cause for visual attention deficits of the elderly.

引用

页码：743 / 749

页数：7

共 28 条

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