Cognitive control during scene categorization: The role of identity repetition and timing in congruence sequence effects.

Cognitive control abilities include maintaining goal-directed behaviors in spite of the incongruence between habitual and desired responses. In interference paradigms, slower responses to incongruent compared to congruent trials are observed; this interference is reduced after incongruent trials (congruence sequential effect, CSE), suggesting that the control exerted to counteract interference in the previous trial also propagates into the following trial. Moreover, a larger CSE is observed when trial features are repeated. Binding-retrieval accounts suggest that trial features that occur in the same time frame are bound together in an episodic representation; if a feature is repeated in the next trial, the control state that was active in the previous trial is also reactivated, resulting in a modulation of congruence effects. However, previous studies that used stimulus sets characterized by intracategory variability (e.g., faces and scenes) observed CSE modulation by the repetition of response categories but were inconclusive concerning whether repeating the identity of a stimulus may modulate CSE. The present study investigates whether episodic stimulus representations include both stimulus identity and response category information, by comparing the impact of the repetition of novel pictures (no identity repetition) and of frequent pictures (in which identity is repeated over trials) in a picture-word interference task. Results indicated that stimulus identity was not critical in the modulation of CSE, and that CSE was little affected by response-stimulus interval. Altogether, the present results contribute to the understanding and theoretical specification of sequential effects.