In a spatial Stroop task, the eye-gaze target produces the reversed spatial Stroop effect—responses become shorter when the gaze direction and its location are incongruent than when they are congruent. The present study examined the face inversion effect on the gaze spatial Stroop task to clarify whether the holistic face processing or part-based processing of the eyes is responsible for the reversed spatial Stroop effect. In Experiment 1, participants judged the gaze direction of the upright or inverted face with a neutral expression presented either in the left or right visual field. In Experiment 2, we examined whether face inversion interacted with facial expressions (i.e., angry, happy, neutral, and sad). Face inversion disrupted holistic face processing, slowing down the overall performance relative to the performance with upright faces. However, face inversion did not affect the reversed spatial Stroop effect. These results further support the parts-based processing account and suggest that while faces are processed holistically, the reversed spatial Stroop effect, relying on the extracted local features (i.e., eyes), may be processed in a part-based manner.
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