Effects of flash luminance and positional expectancies on visual response latency. Hughes, H. Perception & Psychophysics, 36(2):177–184, 1984. doi abstract bibtex It is well established that human observers respond more quickly to visual targets that appear in expected locations than they do to ones in unexpected locations. These variations in simple RT have been attributed to a covert alignment of an attentional mechanism to the expected target location. The present 2 experiments investigated the influence of strength of signal and strength of 20 undergraduates' positional expectancy on the magnitude of this attentional effect. In Exp I ( n = 8) target luminance was varied over a range of 3 log units, and the effects of luminance were essentially additive with the effect of the positional expectancy (i.e., the attention effect). Exp II ( n = 12) found that the magnitude of visual attention interacted with the information value of the precue used to create the spatial expectancy, although, once again, luminance had additive effects. Results indicate that, rather than influencing early visual processing, the act of attending to a spatial location operates fairly late in the detection process. (36 ref) (PsycINFO Database Copyright 1985 American Psychological Assn, all rights reserved).
@article{hughes_effects_1984,
title = {Effects of flash luminance and positional expectancies on visual response latency},
volume = {36},
doi = {10/d7qm22},
abstract = {It is well established that human observers respond more quickly to visual targets that appear in expected locations than they do to ones in unexpected locations. These variations in simple RT have been attributed to a covert alignment of an attentional mechanism to the expected target location. The present 2 experiments investigated the influence of strength of signal and strength of 20 undergraduates' positional expectancy on the magnitude of this attentional effect. In Exp I ( n = 8) target luminance was varied over a range of 3 log units, and the effects of luminance were essentially additive with the effect of the positional expectancy (i.e., the attention effect). Exp II ( n = 12) found that the magnitude of visual attention interacted with the information value of the precue used to create the spatial expectancy, although, once again, luminance had additive effects. Results indicate that, rather than influencing early visual processing, the act of attending to a spatial location operates fairly late in the detection process. (36 ref) (PsycINFO Database Copyright 1985 American Psychological Assn, all rights reserved).},
number = {2},
journal = {Perception \& Psychophysics},
author = {Hughes, H.C.},
year = {1984},
keywords = {\#nosource, flash luminance \& positional expectancy, visual response latency, college students. Luminance Expectations Signal Detection (Perception) Spatial Organization Reaction Time Visual Perception (2323).},
pages = {177--184},
}
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