Cognitive models of eating disorders posit that local processing, which describes cognitive biases in body perception and judgment, plays a major role in the development and maintenance of eating symptoms. This study investigated the presence of cognitive biases in perceiving subtle differences in facial, body, and object(house) stimuli from the inversion effect standpoint. Using Navon's experimental task, a basic information processing skill related to eating symptoms was also examined. Ninety six female college students reported their eating and body dysmorphic symptoms using self-report scales. In a visual discrimination experiment, identical or different pairs of facial, body, and object(house) stimuli were presented in an inverted direction. The participants were then asked to indicate whether they perceived the stimuli to be identical. In a Navon's task, the participants were asked to view and react to small letters that compromise large letters; these letters were presented within a short duration. Results revealed that the levels of eating symptoms were positively correlated with the individual accuracy of facial stimuli discrimination. The body dissatisfaction, the lower factor of eating symptoms, was positively correlated with the accuracy of facial stimuli. This result was statistically significant after controlling for the body dysmorphic level of the participants. This suggests that individuals with high eating symptoms, especially high body dissatisfaction are likely to use local processing on symptom-related stimuli. Based on the results, the clinical implications, limitations of this study and the direction of follow-up studies were discussed.
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