The results of the current study showed that both contact-based education and ACT groups were effective in reducing stigma among nursing students. Although there was no comparative study in this context, the results of the study by Patten et al. (
22), Chan et al. (
23) and Ashe (
38) were consistent with those of the current study in the context of contact-based education, and also the results of the studies by Masuda et al. (
32), and Hayes et al. (
33), were consistent with those of the current study in the context of ACT.
In fact, stereotype was a cognitive component of the attitude in the psychiatric disorders of the society and mostly worked as schema. Social psychologists believe that people can remember and apply the information that is compatible with their own Schema. As human beings are miser cognitions, and stereotypes help them to use their least cognitive effort in most of the conditions, specifically in identifying people (
39). Therefore, ACT does not change thoughts and feelings, also it can teach people some stereotypes by changing social/verbal context and people consequently accept them without any judgment instead of challenging with thoughts and feelings related to the psychiatric disorders (
40).
Incompatible information with schemas may also exist as powerful as/even more powerful than compatible information with schemas in the memory. Hence, when people are asked to remind the needed information, they show strong tendency toward remind incompatible information with schemas instead of recognition (
39). Contact-based education may also change the content of stereotypes by challenging students in the academic environment as the best place to learn and teach and also provide exposure conditions, which are completely inconsistent with their stereotypes about psychiatric disorder (
41). Therefore, when believing the stereotypes of psychiatric disorders has faltered, negative emotional reactions (prejudice) toward these patients may be reduced, and it changes discriminative behaviors toward patients (
42).
The results of the current study were not consistent with those of the previous studies by Papish et al. (
27) in terms of contact-based education effects on reducing stigma due to different methodology and assessment levels of stigma. The current study results not consistent with those of the study of Pinto-Foltz et al. (
28) due to the different research populations (secondary school students), and the research of Yiu et al. studying stigma among people with HIV (
43).
In the current study, both educational methods were effective on reducing social distance rather than psychiatric disorders and diagnostic overshadowing. The results of the study by Frogeli et al. was based on the effects of ACT on reducing patients’ stress in nursing education (
44), and results of the study by Chan et al. was based on the effect of video contact-education (
23). Thonon et al. studied the effect of video on schizophrenia (
45) confirmed the results of the current study and caused social distance reduction, science development, and negative stereotypes elimination in psychiatric disorders.
According to the social psychology model, stereotypes are considered as science learned by individuals and demonstrate individuals’ beliefs and consensus toward features of a specific group in the society (
42). Nursing students’ attitude is also the reflection of their fear and anxiety toward mental illnesses before beginning clinical education and it is commonly predictable (
46). Some experiences such as communicating with patients with psychosis, mania, suicide, and aggression during clerkship may cause moderate or severe levels of anxiety for students (
47), and it may help them for more thinking about separating »us« from »them« and social distance from mental illnesses (
21). Students learned in ACT how to face these internal unpleasant experiences of mental illnesses and let the experiences to be created instead of controlling and avoiding them, because accepting internal experiences tolerates and reduces the threatening of thoughts and feelings related to psychiatric disorders (
40). It also reduces their distance from patients and reinforces their relationship. Therefore, when students communicate with patients with mental illnesses during clerkship, diagnostic overshadowing of stereotypes decreases by combining new information and challenging negative beliefs (
38). On the other hand, direct experience of interacting with the improved patients in contact-based education reduces anxiety and other negative emotions such as fear, aggression, and specially being threatened from and strengthening empathy toward patients; finally, it reduces social distance and eliminates diagnostic over shadowing (
20,
48).
In Iran, as a traditional country, stereotypes of discredit and undervalue are deeply integrated in social norms among people with psychiatric disorders (
49), and they also work as a barrier to disclose mental illnesses as a key factor to reduce stigma (
50). Although mean score of disclosure subscale in the current study significantly reduced in pretest, posttest, and 1-month follow-up sessions, changes of this subscale showed no significant difference among groups. The results of the study by Amini et al. in Iran was based on lack of effects of psyche clerkship on tendency toward disclose mental illnesses among medical students, confirming the results of the current study (
18). But the results of the study by Papish et al. in Canada based on the effects of contact-based education on increasing the tendency toward self-disclosure was not consistent with the results of the current study (
27).
In the current study, contact-based education was effective on reducing negative attitudes toward patients’ recovery and social responsibility. However, there was no significant reduction in ACT and control groups.
Training the biological nature of mental illnesses may persist stigma by understanding the fact that mental illnesses are irreversible and have no social responsibility (
21). On the other hand, lack of effective treatment for mental illnesses are considered as the main reason for stigma and this mentality also existed among psychiatrists. There are some reasons such as disapproved usefulness of some treatments, the use of older therapeutic methods based on different theories and with no empirical evidence, side effects of treatments that may be tolerated if effective and otherwise it may be unacceptable (
51). Hence, students need additional knowledge besides their training course to correct these misconceptions (
52). In contact-based education group, students’ direct communication with improved patients leads to directly experience the results of mental illnesses treatment and responsibility of these patients than ACT group; it also helps to change the negative attitudes toward treatment of mental illnesses.
Unavailability of students participating in the research studying in different faculties and majority of them were not resident in Mashhad is considered as one of the current study limitations; therefore, implementation of trainings on the control group was impossible.
5.1. Conclusions
The results of the current study showed that although both contact-based education and ACT methods had effects on reducing stigma into mental illnesses, social distance and diagnostic overshadowing of psychiatric disorders among nursing students, none of these training methods had effects on disclosing psychiatric disorders. On the other hand, contact-based education had effects on reducing negative attitudes of patients’ recovery and social responsibility.