Evidence against signal enhancement as a mechanism of direct selection by color.
Two of the possible mechanisms that have been put forward to explain precuing effects are signal enhancement and uncertainty reduction. Signal enhancement leads to processing advantages for valid information because the signal at the known input channel is enhanced, whereas uncertainty reduction allows observers to ignore confusing distractor items in a display. Both mechanisms have been reported to be involved in location precuing, but it is still unclear which of these two mechanisms is responsible for color cuing effects. Two experiments are reported in which expectancy for a certain color in a single-item display was created. Targetswere presented briefly and were masked. If color cues produce signal enhancement, then a color cuing effect should result. If color cues only allow uncertainty reduction, however, there should be no color cuing effect because there are no distractors in single-item displays. The results of both experiments favor uncertainty reduction as the mechanism behind color cuing, because no signs of signal enhancement-based cuing effects were observed.
Vierck
Esther
E
Department of Psychology, University of Otago, Dunedin, New Zealand. esther@psy.otago.ac.nz
Miller
Jeff
J
D000293:Adolescent; D000328:Adult; D002755:Choice Behavior; D003118:Color Perception; D003463:Cues; D005260:Female; D006801:Humans; D008297:Male; D017603:Signal Detection, Psychological; D014796:Visual Perception