Object-based selection under focused attention: A failure to replicate

In a recent study, Lavie and Driver (1996) reported that object-based effec ts found with distributed attention disappear when attention is focused on a narrow area of the display. This finding stands in contrast with previous reports of object-based effects under conditions of focused attention (e.g ., Atchley & Kramer, 1998; Egly, Driver, & Rafal, 1994). The present study was an attempt to replicate Lavie and Driver's finding, using similar task and stimuli. While Lavie and Driver's object-based effect in the distribute d attention condition was replicated, its absence in the focused attention condition was not. In the two experiments reported in this paper, object-ba sed effects were found under conditions of both distributed and focused att ention, with no difference in the magnitude of the object-based effects in the two conditions. It is concluded that, in contrast with Lavie and Driver 's claim, the initial spatial setting of attention does not influence objec t-based constraints on the distribution of attention.