Psycho-vaccine refers to a small dose of stress that can enhance psychological immunity,and it may be a life-event,experience,training,learning,etc.,that enters the human brain and self processes,enhancing the cognitive function of the brain,with the characteristics of irritability,accumulation,and covertness,and so on.The world military powers,represented by the United States,have begun extensive researches on psycho-vaccine,such as psychological resilience enhancement,"super-soldier"plan,and other projects.In-depth researches have been conducted on the action pathways,vaccination,and promotion of psycho-vaccine in whole army.Our military still lacks systematic research on psycho-vaccine,vaccination and prevention and control.There still exist some problems in the current research of psycho-vaccine,including uncertain specificity,unclear threshold of natural stress vaccination,uncertain chain-relationship of psycho-virus—psycho-vaccine—psycho-antibody,and unclear effect of novel psycho-vaccination.Future researches on psycho-vaccine should be carried out in following 4 aspects:①confirm the specificity of different types of psycho-vaccine;②clarify the doses,types,and ways of natural stress vaccination;③uncover the chain relationship of psycho-virus—psycho-vaccine—psycho-antibdy;④develop novel psycho-vaccination.

Objective To revise the Inventory of Alienation Toward Parents(IAP)and test its reliability and validity in a military population in order to provide a scientific tool for assessing the level and grade of parent-child alienation among military personnel.Methods Whole-cluster stratified random sampling was used to subject 8 641 service members from 8 Army units.Then all participants were surveyed with 18-item adolescent IAP,Beck Depression Inventory-Ⅱ,and Generalized Anxiety Disorder-7.SPSS 27.0 and AMOS 26.0 were used to perform item analysis,exploratory factor analysis(EFA),and confirmatory factor analysis(CFA)to assess reliability and validity.Subsequently,our revised 16-item version of IAP was employed to develop means,percentiles,cut-off scores,and category norms.Results ①Items 3 and 12 were deleted in item analysis.②EFA extracted the original communication and emotional distance factors;CFA indicated that the two-factor model had good fitness,with the mother-child alienation scale:χ2/df=4.248,comparative fit index(CFI)=0.962,Tucker-Lewis index(TLI)=0.929,root mean square error of approximation(RMSEA)=0.028,standardized root mean squared residual(SRMR)=0.023;while the father-child alienation scale:χ2/df=5.41,CFI=0.939,TLI=0.901,RMSEA=0.032,SRMR=0.044.③The internal consistency reliability of the total IAP was good(0.744～0.888).④The total IAP score and scores of the mother-child and father-child subscales were positively correlated with depression and anxiety(r=0.395～0.493,P<0.01).⑤ The average total IAP score for military personnel was 17.27±4.21,and the scores of mother-child alienation and father-child alienation were 8.64±2.26 and 8.62±2.43,respectively.With percentiles of P75 and P90 as the cut-off points,the total IAP score can be stratified into 3 levels,that is,normal(≤16),moderate(17～19),and severe(≥20).Then,additional category norms were developed based on demographic characteristics.Conclusion Our revised 16-item military version of IAP shows good reliability and validity.A preliminary and representative norm is developed primarily,and can be used to assess the level and grade of military parental alienation.

Objective To investigate the influence of stress on insomnia among plateau soldiers,and explore the mediating role of parent-child alienation and the moderating role of emotion regulation strategies in this relationship.Methods A cross-sectional study design was adopted in this study.Our Self-designed General Information Questionnaire,Plateau Soldiers Stressor Scale,Insomnia Severity Index,Inventory of Alienation towards Parents,and Emotion Regulation Scale were employed to survey 2 065 plateau soldiers at an average altitude of 4 200 m.With aid of SPSS 26.0 statistics,descriptive analysis,correlation analysis and regression analysis were applied to analyze stress status,parent-child alienation,insomnia and emotion regulation in the participants,and then a structural equation model was established.Results ① The scores of stress,parent-child alienation and insomnia were significantly higher in the participants who were older,well educated(P＜0.01)and were or had been in a marital relationship(married,divorced,or widowed)(P＜0.001)than those without above conditions.② Significant pairwise positive correlations were observed among stress,parent-child alienation,insomnia,cognitive reappraisal,and expressive suppression(r=0.08～0.61,P＜0.001).③ Stress and expressive suppression could positively predict parent-child alienation(β=0.14～0.43,P＜0.001),and stress,parent-child alienation and expressive suppression could positively predict insomnia(β=0.04～0.25,P＜0.01).Cognitive reappraisal could not significantly predict parent-child alienation or insomnia.④ Parent-child alienation towards parents partially mediated the relationship between stress and insomnia,with a mediation effect accounting for 7.29％of the total effect.⑤ Expressive suppression moderated the impact of stress on insomnia(β=-0.01,P＜0.001),and the higher expressive suppression level mitigated the adverse effect of stress on insomnia when compared with the lower expressive suppression level.Conclusion For plateau soldiers,stress significantly predicts insomnia,with parent-child alienation playing a mediating role.Furthermore,a higher level of expressive suppression can effectively buffer the influence of stress on insomnia.

Objective To explore the current status of post-traumatic stress disorder(PTSD)symptoms among military officers at high altitude,determine the effects of childhood trauma experiences on the symptoms,and investigate the role of parent-child alienation in the process.Methods A cross-section study was conducted on 238 male military officers at high altitude subjected with cluster sampling.All of them were surveyed with childhood trauma question(CTQ),inventor of alienation toward parents(IAP),and Post-traumatic Stress Disorder Checklist(PCL-C)in October 2021.Then the mediating effect of parent-child alienation on childhood trauma and PTSD symptoms was investigated.Results ①The prevalence of PTSD-positive symptoms was 8.5％among the military officers at high altitude.②The prevalence of PTSD-positive symptoms was 15.6％for the military officers with childhood trauma,which was significantly higher than that of those without childhood trauma(5.1％,Chi-square=7.27,P＜0.01).③ PTSD symptoms,childhood trauma experiences and parent-child alienation were significantly positively correlated with each other(r=0.35～0.76,P＜0.01).④ Both childhood physical abuse(β=1.05,P＜0.001)and parent-child alienation(β=0.39,P＜0.01)could positively predict the severity of PTSD symptoms for them.⑤Parent-child alienation played a partial mediating role in the association between physical abuse and PTSD symptoms(β=1.16,95％CI:0.54～1.75).Conclusion Military officers at high altitude with childhood trauma have a higher prevalence of PTSD-positive symptoms and more severe symptoms.Childhood physical abuse can not only directly affect PTSD symptoms,but also indirectly affect its severity through parent-child alienation.