Published Papers That Used SuperLab

Two experiments showed that, when selective eye movements were disabled by presenting stimuli in the form of afterimages, increased inspection time and facilitative stimulus configurations failed to increase the subitizing limit of four objects. Afterimages of 2 to 8 dots induced by a photographic flashgun were shown to three adult subjects. For more than 4 objects, enumeration errors occurred at a rate of 20 to 30%. Enumeration was effectively perfect for 2 to 4 linearly configured dots, with occasional errors surprisingly occurring in that range when dots appeared in groups of up to 3 items. No errors occurred in non-afterimage control conditions. Enumeration errors were attributed to failures of individuating dots to be counted due to the deactivation of selective eye movements in afterimages. A third experiment supported this interpretation by disabling eye movements with briefly presented stimuli and producing results much like the afterimage conditions.