Figure 2.

Performance results are presented by target load and working memory condition. a) Accuracy is shown as percent correct. Subjects committed more errors in the 2-target condition, regardless of the working memory condition (storage or manipulation). * indicates p-value < .05. B) RT for accurate trials only in milliseconds. RTs slowed during the 2-target load condition and, generally, in the manipulation condition. A marginal interaction suggested that the 2-target manipulation condition was slowest. ** indicates p-value < .01; *** indicates p-value < .001. Error bars in both graphs represent standard error.