In a modified Stroop word-color paradigm, subjects were instructed to identify the color of a target patch in the center of a briefly exposed visual display and to ignore color names printed above and below the patch at distances of 1, 3, and 5 deg of visual angle. Earlier studies of selective attention to a specified location in the visual field have shown that the focus of attention subtends approximately 1 deg of angle. That is, when distractors associated with an incompatible response are spaced within about 1 deg of the target, reaction time to the target is slower than when the distractors are not associated with an incompatible response. Our results show interference with a 5-deg separation between target and noise elements. This finding casts doubt on the utility of the notion of attentional selectivity.
ASJC Scopus subject areas