11 young (M age = 24.3 yr.) and 11 old (M age = 67.4 yr.) observers attempted to detect signals of limited bandwidth in visual noise. The older observers did not perform as well as the young ones. We considered whether, as suggested by a current hypothesis, these differences could be attributed to higher internal additive noise in the elderly observers. The results suggested that internal noise did not differ across the two age groups and that the lower performance of the older observers stemmed instead from reduced processing efficiency.
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References
1.
CremerR.ZeefE. J. (1987) What kind of noise increases with age?Journal of Gerontology, 42, 515–518.
2.
LeggeG. E.KerstenD.BurgessA. E. (1987) Contrast discrimination in noise. Journal of the Optical Society of America, A, 4, 391–404.
3.
PelliD. G. (1990) The quantum efficiency of human vision. In BlackemoreC. (Ed.), Vision: coding and efficiency. Cambridge, NY: Cambridge Univer. Press. Pp. 3–24.
4.
ThomasJ. P. (1985) Effects of static noise and grating masks on detection and identification of gratings targets. Journal of the Optical Society of America, A, 2, 1586–1592.
5.
WelfordA. T. (1981) Signal, noise, performance, and age. Human Factors, 23, 97–109.
