Automatic and Controlled Processing in Stroop Negative Priming: The Role of Attentional Set

The distinction between automatic and controlled attentional influences on priming effects was examined in a series of Stroop color-naming experiments. As expected, priming effects depended on the proportion of repeated trials—those in which a color word prime matched a following ink-color probe. However, responses were slower for repeated trials than for unrepeated trials when the proportion of repeated trials was no greater than chance (.25 …