Abstract
Event-related potentials (ERPs) were recorded to explore, for the first time, the electrophysiological correlates of the shape Stroop effect. Fifteen healthy individuals were presented with a frame and a name of an object with a typical shape in life and asked to categorize the object's typical shape in life as a 'circle', a 'square,' or a 'triangle' by pressing the relevant button as quickly as possible. Accurate categorization of the name of an object was faster when it was presented with a congruent shape frame (e.g. name of a tyre/circle frame) than with an incongruent one (e.g. name of a tyre/square frame). Scalp ERPs analysis showed that the incongruent condition elicited a more negative component N430 and a more late positive component LPC than the congruent condition. N430 is a critical sign of conflict detection in the early stage, whereas late positive component reflects the response conflict in the late stage. The results provided evidence for the dissociation between conflict detection and conflict resolution in the shape Stroop effect.
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