highly significantp < .001
Presentation time again increased linearly with the number of targets that needed to be encoded into WM in both the pop-out and non pop-out conditions (linear fits were R 2 = .976 for pop-out and R 2 = .987 for non pop-out); these changes were highly significant, F (4, 36) = 66.6, p < .001, η2 = .88 (see Figure 7a ).