Body Function Facial Expression Recognition Of Brain Function Lateralization And Cooperative Processing

The study used body expression stimulus set as experimental material,and used new lateralization paradigm, through two experiments to explore cerebral functional lateralization and integration process of body expression in the upright and inverted conditions.In experiment 1,orientation of body expression (upright,inverted),direction of distractor (left,right, center),and emotion(expression,no expression)were controlled.Participants were asked to judge whether the image expressed a kind of emotion. The experiment 1 showed that, for oritation, the main effect was significant by accuracy and response time, suggesting the inversion effect. For emotion, the accuracy was higher with emotional body expression than the neutral body expression, the response time was shorter with emotional body expression than the neutral body expression.But the main effect of direction of distractor was not significant by accuracy and reaction time, and the interaction effects between variables were not significant. These results suggested that when participants didn't need to make the apparent response to the valence, there were not cerebral functional lateralization and integration process of emotional body expression in the upright and inverted conditions.In experiment 2, orientation of body expression (upright, inverted), direction of distractor (left,right,center), and emotion valence (happy, fearful, angry) were controlled. Participants were asked to judge the emotion valence. The experiment 2 showed that, a) the main effect of oritation was significant by accuracy, the main effect of emotion valence was significant by accuracy and reaction time, the main effect of direction of distractor was not significant by accuracy and reaction time. b)An interaction effect of oritation and emotion valence by accuracy and response time was found. The accuracy of angry and happy body expression suggested inversion effect, but the response time of fearful and happy body expression suggested reversal inversion effect. c) An interaction effect of direction of distractor and emotion valence was found by accuracy, but was not found by response time. The response time was shorter with no distractor than the left distractor and right distractor in the angry body expression, suggesting the hemispheres interacted promoted the angry processing.These results suggested that when participants needed to make the apparent response to the valence, the inversion effect of body expression was effected by emotion valence. The inversion effects tended to appear on the accuracy, but the reversal inversion effect tended to appear on the response time. Although there were not cerebral functional lateralization and integration process of body expression in the upright and inverted conditions, the hemispheres interacted may be found with the angry body expression.Conclusion: a) The lateralization of body expression was not found, maybe the sensitive areas of body posture in the brain were on both the left and right hemisphere.b) The hemispheres interacted was only found with angry body expression, maybe the processing of angry was more difficult. c) The type of task affected the interaction effect of oritation and emotion valence and the interaction effect of direction of distractor and emotion valence.