Figure 4.

Example trials from experiment 3. There were two types of experimental trials. In A, observers viewed two colored shapes in the sample display and, after a brief delay, judged in the test display whether a particular color or shape was present in the sample display. In B, observers viewed two black shapes in the sample display and judged whether a particular shape was present in the sample display. A and B thus contained the same number of objects, but differed in the amount of feature information observers encoded into VSTM.