Effect of Set Size on Response Time and Sensitivity (d′) in Visual Search

This table represents the main effect of set size from the ANOVA—a standard effect in visual search representing an increase in RT and a decrease in d′ with set size, which is an index of search difficulty. The effect of set size on RT was greater with the target absent than with the target present trials in both search tasks as indicated by the target x set size interaction. There was an effect of set size on d′ in the spatial configuration search task, but not in the conjunction search task, reflecting that the conjunction search task is an easier search than the spatial configuration search.