Stimulus-Elicited Involuntary Cognition: Boundary Conditions and Systematic Effects.

For decades, researchers have been presenting participants with stimuli and instructing the participants not to respond to the stimuli in some way. Today, researchers are studying the effects that such stimuli have, not only on behavior, but on conscious experience. To this end, researchers have used several laboratory tasks, including the reflexive imagery task (RIT). In the RIT, participants are instructed not to respond in a specific way to stimuli. Participants often cannot suppress such responses. Knowledge of the conditions under which RIT effects fail to arise can illuminate the limitations of involuntary processes. We observed that the RIT effect can survive with brand symbols (Experiment 1, n = 30), which are different from everyday objects in interesting ways. In addition, we investigated systematic effects. Systematic effects are unlikely to be due to experimental demand. In Experiment 2 (n = 48), we observed that RIT effects could arise from associations learned, not across the participant's lifetime, but only in the laboratory. Participants studied nonsense shapes that were associated with pseudowords that preceded or followed the shapes. Afterward, these new associations led to RIT effects. In addition, RIT effects were more likely for pseudowords that preceded the shapes rather than for the pseudowords that followed the shapes (a systematic effect). In Experiment 3 (n = 46), systematic effects involving two sensory modalities were observed: olfactory stimuli were more likely to elicit involuntary visual imagery than visual stimuli were to elicit involuntary olfactory imagery. We discuss the theoretical implications of these effects.