Grouped locations and object-based attention: Comment on Egly, Driver, and Rafal (1994).

Recently, R. Egly et al (see record 1994-34191-001) provided evidence for an object-based component of visual orienting in a simple cued reaction time task. However, the effects of objects on visual attention can be due to selection from either of 2 very different types of representations: (1) a truly object-based representation that codes for object structure or (2) a grouped array representation that codes for groups of spatial locations. Are Egly et al's results due to selection from an object-based representation or from a grouped array representation? This question was addressed by using a variant of Egly et al's task. The findings replicated those of Egly et al and demonstrated that the selection in this task is mediated through a grouped array representation. The implications of these results for studies of attentional selection are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)