The main purpose of this study was to investigate the mediating role of cognitive emotion regulation in the relationship between childhood traumas and FOH. Our results showed that childhood abuse and neglect could lead to FOH in students by using more maladaptive cognitive emotion regulation strategies (self-blaming, rumination, catastrophizing, and other-blaming) as well as less use of adaptive cognitive emotion regulation strategies (acceptance, positive refocusing, and positive reappraisal). Although no research was found to be consistent with the findings of the present study, Our results were consistent with a number of previous studies’ findings (
9,
11,
14,
23,
24,
29-
31), suggesting that cognitive emotion regulation could mediate the relationship between childhood traumas and psychological problems or disorders (e.g., anxiety, depression, post-traumatic stress disorder, borderline personality, nonsuicidal self-injury, internalizing/externalizing behavioral problems). On the other hand, only one study was found to examine the relationship between childhood traumas and FOH (
7), which its results were consistent with those of the present study.
Huh et al. (
9) found that the total score of maladaptive cognitive emotion regulation mediated the relationship between childhood traumas and the severity of adulthood depression and anxiety symptoms in people with depressive disorders, but the total score of adaptive cognitive emotion regulation was not a mediator of this relationship. When comparing the findings of the two studies, one should notice that the recent study was conducted on people with depressive disorders, but we enrolled university students in the present research. Khoramimanesh and Mansouri (
11), in a recent study conducted on female-headed households, also reported that maladaptive cognitive emotion regulation strategies and negative spiritual coping strategies mediated the relationship between a history of traumas and borderline personality symptoms. Furthermore, Ghaderi et al. (
14) reported that the relationship between early-life traumas and nonsuicidal self‑injury in adolescents was mediated by emotion regulation and intolerance of uncertainty. Researchers in the recent study enrolled adolescents and used the Difficulties in Emotion Regulation scale (DERS). Hopfinger et al. (
23), in a study on patients with major depressive disorder and using the Emotion Regulation Skills questionnaire (ERSQ), found that deficits in general emotion regulation mediated the association between childhood traumas and depression. In a report from South Korea, Choi and Ja (
24) reported that emotion dysregulation (measured by an emotion regulation checklist) mediated the relationship between cumulative childhood traumas and internalizing/externalizing behavioral problems in sexually abused children aged 6 - 13 years. The results of John et al. (
29) showed that difficulties in emotion regulation) affected the relationship between a history of child abuse and current PTSD/depression severity in adolescent females, and Fossati et al. (
30) found that emotion dysregulation mediated the link between childhood traumas and adulthood attachment and borderline personality disorder. Finally, Gratz et al. (
32) showed that emotion dysregulation mediated the relationships of maltreatment and negative intensity/reactivity with borderline personality symptoms. All these studies emphasize that emotion regulation can mediate the relationship between childhood traumas or maltreatment and the development of psychological problems and disorders during later life. However, there are methodological differences (scales, samples, etc.) between these studies.
Huh et al. (
9) presented several theories for emotion regulation development. Based on the biosocial and attachment theory, the maladaptive emotion regulation strategies originating from childhood traumas or invalidating environments can cause vulnerability to psychological problems (i.e., depression and anxiety). Based on the cognitive behavioral theory, the maladaptive appraisal of negative life events may be at the core of psychological dysfunctions. According to the social learning theory, emotionally-neglected individuals may have had deficient opportunities to learn adaptive strategies through caregiver modeling, which makes them vulnerable to psychological problems in adulthood (
9). The results of the present study indicated that childhood traumas, by using more maladaptive strategies (self-blaming, rumination, catastrophizing, and other-blaming) and less use of adaptive strategies (acceptance, positive refocusing, and positive reappraisal) could lead to FOH in students.
The present study has some limitations. First, this was a cross-sectional study. Second, this study was conducted on a group of students, but future research can be carried out on a group of people with a history of childhood traumas. Third, in this study, a non-random sampling method was used; other studies can use probability sampling methods. Fourth, using self-report measures could have affected the results of the present research because of various reasons such as bias and social desirability responses. The findings of the present study recommend that mental health professionals should investigate a history of childhood traumas in individuals with mental problems and perform psychological interventions such as dialectical behavior therapy concerning the type of traumas and the time of its occurrence. Mental health professionals and researchers can also use the results of the present study to better understand mediators of the relationship between childhood traumas and FOH.