Aging and selective attention to location and color : visual event-related potentials

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Mary Marvin Schroeder (Creator)
The University of North Carolina at Greensboro (UNCG )
Web Site:
M. Russell Harter

Abstract: Studies of selective attention in normally aging individuals using event related potential (ERP) and reaction time (RT) measures have suggested slowing and reduced selectivity with age, particularly when the location of the relevant stimulus is uncertain. The purpose of this study was to investigate the effects of age on the time course and scalp distribution of ERP indicants of spatial and feature selective attention. Group differences in spatial relevance effects were expected to be earlier and more frontal; feature relevance effects, later and more posterior. Healthy normal subjects were recruited for the study. The mean age of the 8 younger and 8 older subjects was 25 yrs. and 70 yrs., respectively. The stimuli consisted of red and green flashes presented in the left or right visual field, one of which was task relevant. ERPs were recorded from occipital, central, and frontal sites. The amplitude and latency of the largest deflection in four time windows of the ERP associated with feature and spatial relevance effects were measured (P144, N188, N325, and P445).

Additional Information

Language: English
Date: 1988
Selectivity (Psychology)
Visual evoked response

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