Mean values of parameters of working memory for 17 conditions from the first 8 experiments. (A) Top panel: Parameter C, items in central storage; (B) middle panel, Parameter Pverb, items in peripheral verbal storage; (C) bottom panel, Parameter Pobj, objects in peripheral visual storage. Experiments in Series 3 (3a and 3b) are the only ones that required binding of visual features (colors with shapes) and verbal features (digits with spoken voices), and they produced much lower estimates of peripheral information storage than did the other experiments.