Multi-viewpoint Emotional Biological Motion Recognition And Its Brain Mechanism

As highly social creatures,humans rely on their ability to perceive biological motion to recognize,interpret,and predict the behavior of others,even when visual cues are limited,and can still extract social information from it.In current researches,point-light displays are often employed to obtain stimuli in biological motion.Behavioral studies of different viewpoints have shown that bodily representations are somewhat viewpoint-dependent and that the ability to process orientation information is critical to our understanding of how others interact with us and the world around them.But what exactly the neural mechanisms underlying this emotional biological motion sensitivity are remains poorly answered.What traits of the brain contribute to individual differences in emotional biological motion processing and which interactions between brain regions might be relevant? The neural mechanisms underlying emotional biological motion from different viewpoints are not well understood.The present study was conducted experimentally with this goal in mind.In total,this thesis is divided into two experiments.Experiment 1 used behavioral experiments and resting-state functional connectivity to investigate the prediction of restingstate brain networks for the recognition of emotional biological motions from different viewpoints,involving six emotions（happy,neutral,angry,disgust,fearful,sad）and three viewpoints（0°,45°,90°）;Experiment 2 asked subjects to judge the emotion and viewpoint of biological motions separately,and under different tasks the same stimuli were presented: pointlight displays performed at different viewpoints（0°,45°,90°）and different emotions（happy,neutral,angry）,and task-state functional MRI was used to explore the brain mechanism of multi-viewpoint emotional biological motion recognition.Different viewpoints affect the recognition of biological motions,and in this study we not only found that the emotional biological motions of the point-light displays were observed from three different viewpoints of 0°,45°,and 90°,with the best performance at 45° viewpoint and the worst at 90° viewpoint;we also revealed that the whole-brain functional connectivity results have a potential predictive effect on the recognition of multi-viewpoint emotional biological motion;in addition to this,we also verified the previous findings that extra-striate body area was activated at different emotions and viewpoints and sensitive to emotional biological motion at different viewpoints.Finally,we found that the lingual gyrus and the cuneus were the key brain regions involved in the integration of the viewpoint of dynamic point-light displays discrimination processing,especially the activation of the lingual gyrus and the cuneus was more obvious at 0° contrast 90°.This study provides a preliminary exploration of the brain area correlation of different emotions in different viewpoints,and provides possible MRI evidence for the cognitive basis of six emotional biological motion recognition.It not only enriches and deepens the cognitive understanding of the functional brain connectivity basis of multi-viewpoint emotional biological motion,but also provides a basis for further exploration of emotional biological motions.