Figure 4.
(a) Spatial VWM paradigm of Bays and Husain [46]. Observers report whether the probe was displaced leftward or rightward relative to the corresponding sample item. (b) Results from set size 8 in a replication experiment [52]. The X axis shows the amount of displacement of the probe relative to the original item, with negative values indicating a leftward displacement and positive values indicating a rightward displacement. The Y axis shows the probability that the subject reported a rightward displacement. When the displacement was large, subjects were nearly perfect: they nearly always reported a rightward displacement for a large rightward displacement and almost never reported a rightward displacement for a large leftward displacement. Bays and Husain argued that this nearly perfect memory for large displacements at set size 8 was strong evidence against the slot model and in favor of the resource model, but later research showed that these results could be explained by a guessing strategy [52]. (c) Results when the task was changed slightly to eliminate the guessing strategy. Observers were no longer nearly perfect for large displacements. Panels (b) and (c) were reprinted from [52] with kind permission from Springer Science and Business Media.