Effects of Type of Design (Blocked vs. Randomized) on Stroop and Emotional Stroop Tasks

Résumé 0

"The purpose of the present study was to investigate the effects of stimulus fragmentation on Stroop andemotional Stroop interference and facilitation effects when stimuli at all fragmentation levels wereblocked by condition as well as when they were totally randomized across conditions. Under blockedconditions, in which stimuli from the same condition (e.g., congruent, incongruent, control conditions)at all levels of fragmentation were presented in the same block, interference appeared even at the mostfragmented level, and increased linearly until level 8. The same occurred with facilitation. Randomizeddesigns, on the other hand, showed that interference did no appear until level 4 and increased linearlyuntil level 8, whereas facilitation disappeared. Previous work from our laboratory showed thatwords are objectively identified at level 4. The findings suggest the existence of a response set in blockeddesigns, which in turn may speak against the automaticity of the Stroop effect."