Effectiveness Evaluation of Video Evoked Target-Emotion Method
Authors: Fan Xiaoli , Guo Hua , Wu Feng , Shao Shuyu 
Published: October 2023

This paper mainly evaluates and studies the effectiveness of video to induce five target emotions: happiness, sadness, relaxation, fear and neutrality, providing theoretical basis and guiding significance for better application of such methods in emotion-related research in the future. This study adopted the methods of desktop research, subjective self-evaluation and expert evaluation to collect and screen out 20 emotion-inducing video materials from major mainstream video websites. On this basis, a reasonable emotion-inducing experiment paradigm was designed: First, the guidance was presented, and then the video clips were played to induce the target emotions. After each video, the subjects were required to complete the evaluation of the perception and experience. In order to avoid the mutual influence of the emotional states of different video clips, the subjects were required to rest and recover during the interval before starting the next trial. As for the rules of subjective self-evaluation of emotions, referring to the report questionnaire containing multiple emotional dimensions used by Gross to evaluate movie clips, this paper selects 10 relevant dimensions to form a questionnaire, including happiness, arousal, fear, happiness, interest, pain, relaxation, sadness, surprise and tension, and finally collects the emotional dimensions induced by videos and the corresponding emotional intensity. The emotional intensity was scored by Likert 9-point scoring method. The subjective evaluation data of 68 subjects were collected in the formal experiment. The intensity and differentiation of target emotion were used as the evaluation indexes of the effectiveness of emotion induced by video materials in the paper. Emotional intensity refers to the score of emotional intensity of subjects in the subjective evaluation process, and the hit rate is used to represent the differentiation degree of emotional induction, specifically referring to the ratio of the number of subjects whose score difference of target emotion is higher than that of non-target emotion by ≥1 point to the total number of subjects. Taking the video clip with the most successful target emotion induction as an example, it is found that the target emotion evoked hit rate of these videos is greater than 50% through calculation, indicating that the target emotion evoked is relatively concentrated. In order to further test the effectiveness of emotional induction of video materials, the emotional dimension in the subjective evaluation data was taken as the independent variable, and the corresponding score value was taken as the dependent variable. One-way ANOVA and LSD post test were performed on the subjective score value of each target emotion-induced video material. The results showed that different video materials would produce higher intensity in several emotional dimensions (P<0.05) after emotional induction, but in contrast, the score of target emotion dimension was significantly higher than that of other emotional dimensions, indicating the effectiveness of video in inducing target emotion. This study has a certain reference value for the establishment of emotion database and the effective induction of laboratory emotion in the future emotional research.