Top-down and bottom-up sequential modulations of congruency effects |
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Authors: | Wim Notebaert Wim Gevers Frederick Verbruggen Baptist Liefooghe |
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Institution: | Department of Experimental Psychology, Ghent University, Henri Dunantlaan 2, 9000 Ghent, Belgium. wim.notebaert@ugent.be |
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Abstract: | Several studies have demonstrated reduced congruency effects after incongruent trials. The conflict monitoring hypothesis
(Botvinick, Braver, Barch, Carter, & Cohen, 2001) assumes that this sequential modulation is based on top-down cognitive control
and suggests that more control is engaged after the detection of conflict. An alternative account is based on repetition effects
of stimulus and response features and can be considered bottom up. This study investigates both modulatory sources. In a Stroop
task with two response-stimulus intervals (RSIs), we demonstrate that top-down modulation does not occur with a very short
RSI, suggesting that it takes some time before the system can be reconfigured. Bottom-up modulation is observed for both RSIs.
This finding demonstrates that two different sources simultaneously reduce congruency effects after incongruent trials. |
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