Stimulus-Response Pattern: The Core of Robust Cross-stimulus Facial Depression Recognition

Facial depression recognition is one of the current hot topics. Mainstream methods mainly focus on how to design deep models to effectively extract the difference in facial movements between depressed patients and healthy people. However, this difference changes when the stimulus source to which the subjects are exposed changes. This leads to the performance degradation in cross-stimulus situation and limits the practical application of this technology. We hold the opinion that why depressed patients show behavioral characteristics different from healthy people is that they have a specific stable pattern of responding to stimulus. Therefore, we incorporate stimuli into the modeling process for the first time and employ deep networks to learn stable representations between stimulus and response to achieve stable and effective modeling. Specifically, we propose a deep modeling framework to learn the stimulus-response pattern of the subject through the interaction relationship between the stimulus videos and the subject's facial movements. We constructed a balanced depression dataset of 364 individuals with three different stimulus videos to verify the effectiveness of our method. The results show that our method achieves state-of-the-art and the best generalization performance in depression recognition. This stimulus-response pattern modeling provides a new perspective for recognizing depression. Code available at: https://github.com/bailubujianwu/Stimulus -Response-Pattern.