Figure 6.

Example trials from experiment 4. There were two types of experimental trials. In A, observers viewed in the sample display one object containing a colored cap attached to a black stem. In B, observers viewed in the sample display two objects, one containing a colored cap and the other containing a black stem. In both conditions, after a brief delay, observers judged in the test display whether a particular cap color or stem shape was present in the sample display. A and B thus contained the same number of features, but different numbers of objects. To facilitate object individuation and prevent grouping when objects appeared next to each other, eight dark squares, marking all possible object locations, were always present in the display.