Figure 4.

A, Sample stimuli used in experiment 3. Each sample display consisted of six colored shapes, which contained either a total of one unique shape and one unique color, a total of one unique shape and six unique colors, a total of six unique shapes and one unique color, or a total of six unique shapes and six unique colors. B, Left, Behavioral performance as indicated by Cowan's K measures (Cowan, 2001). The number of object colors retained in VSTM increased as the number of colors in the display increased from one to six. There was no interaction between the color-encoding load and shape identity. B, Middle and Right, fMRI peak responses from the superior IPS and the LOC ROIs. Superior IPS response mirrored the behavioral VSTM capacity measure, showing no interaction between color-encoding load and shape identity. In the LOC, when only one color was encoded, response was lower for six identical than for six different shapes; and when six colors were encoded, however, there was no effect of shape identity. There was a significant interaction between the color-encoding load and shape identity. Errors shown are within-subject SEs.