关键词: 手机依赖, 身体羞耻, 社交焦虑, 潜在增长模型

Abstract: Social anxiety is a common emotional feature in the growth of children and adolescents. It mainly refers to the emotional experience of tension and anxiety when individuals interact with others in real life, which has a certain degree of negative impact on interpersonal skills, personal growth, development potential, and life attitude. In view of the multiplicity of social anxiety and its extensive influence, researchers have paid close attention to it in recent years, and it is particularly important to explore its influencing factors and developmental mechanisms. In particular, indulging in mobile phones may lead to the degradation of individual social skills, which in turn may induce social anxiety and other adaptation problems. At the same time, the propaganda of the ideal body image in media may cause the conflict between the ideal and reality among junior high school students, and deepen the shame of their own bodies. Previous studies have also shown that physical shame may play a mediating role in the relationship between mobile phone dependence and social anxiety.
However, most literature still uses the traditional analysis method of comparing the change of mean value, which is unable to provide information of the complete development rate of variables, and it is difficult to accurately grasp the dynamic development process among variables. Therefore, this study intends to take junior high school students as the research subjects, using the two indicators of initial level and development rate in the latent growth model, to examine the developmental trend of mobile phone dependence in junior high school students, body shame, and social anxiety from a dynamic perspective, and further explore the internal mechanisms of the three.
Using the Mobile Phone Dependence Scale, the Body Shame Scale, and the Social Communication Anxiety Scale, 339 junior high school students from two middle schools in Hunan Province were followed for three times in a year. All data were analyzed using SPSS 26.0 and Mplus 7.0. The first step is to use SPSS 26.0 for descriptive statistics and correlation analysis. Secondly, using Mplus 7.0 to build an unconditional latent growth model to examine the development trend of each variable, in which the intercept represents the initial state and the slope represents the development rate. The third step is to establish a conditional latent growth model to test whether the development track of social anxiety is directly affected by mobile phone dependence. The fourth step is to construct a structural equation model to explore the relationship between intercept and slope of mobile phone dependence, body shame, and social anxiety.
The results showed that: (1) Mobile phone dependence, body shame and social anxiety in junior high school students all showed a steady upward trend, and the initial level and development rate of social anxiety were significantly negatively correlated. (2) The initial level and development rate of mobile phone dependence can directly predict the initial level and development rate of social anxiety respectively. (3) The initial level and development rate of body shame played a complete longitudinal mediating role in the mechanism of the influence of mobile phone dependence on the development of social anxiety.
Based on the longitudinal time course and the latent growth model, this study systematically explored the changing track, characteristics, and dynamic relationship among junior high school students' mobile phone dependence, body shame, and social anxiety, and accurately described the development and possible mechanisms of adolescent social anxiety and its risk factors. The results supported the Social Replacement Hypothesis, the Tripartite Influence Model, and the Cognitive Model of Social Anxiety, which has practical guiding significance for deepening the understanding of junior high school students' social anxiety, establishing effective detection and intervention measures, and promoting the mental health development of junior high school students.

Key words: mobile phone dependence, body shame, social anxiety, latent growth model