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Top-down and bottom-up sequential modulations of congruency effects
Wim Notebaert1, Wim Gevers, Frederick Verbruggen
1Department of Experimental Psychology, Ghent University, Henri Dunantlaan 2, 9000 Ghent, Belgium. wim.notebaert@ugent.be
Psychonomic Bulletin & Review
|May 27, 2006
Summary
Cognitive control mechanisms, including top-down and bottom-up processes, reduce Stroop task interference after conflict. Top-down control requires time to engage, while bottom-up processes operate immediately.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human Behavior
Background:
- Reduced congruency effects after incongruent trials are well-documented.
- The conflict monitoring hypothesis posits top-down cognitive control engagement following conflict detection.
- An alternative bottom-up account attributes this to stimulus and response repetition effects.
Purpose of the Study:
- To investigate the interplay of top-down and bottom-up modulatory sources on sequential congruency effects.
- To determine the temporal dynamics of cognitive control engagement after conflict.
Main Methods:
- Utilized a Stroop task paradigm.
- Manipulated response-stimulus intervals (RSIs) to differentiate temporal processing.
- Analyzed behavioral data to assess congruency effects.
Main Results:
- Top-down modulation was absent with very short response-stimulus intervals (RSIs), indicating a temporal requirement for cognitive reconfiguration.
- Bottom-up modulation was consistently observed across both short and long RSIs.
- Demonstrated the simultaneous operation of two distinct sources reducing congruency effects.
Conclusions:
- Sequential modulation of congruency effects involves both top-down and bottom-up mechanisms.
- Top-down cognitive control requires a minimum time window to become effective after conflict.
- Bottom-up processes contribute to immediate conflict adaptation, irrespective of temporal delays.
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