Comparison of the Effects of a Genetic, a Mild Encephalitis, and a Psychosocial Causal Explanation of Schizophrenia on Stigmatizing Attitudes – a Pilot Study With a Quasi-Experimental Design

Background: Previous research has shown that the endorsement of biogenetic causal explanations of schizophrenia is associated with stronger stigmatizing attitudes against people with schizophrenia than the endorsement of psychosocial explanations. However, little is known about whether different biogenetic causal explanation beliefs differentially affect stigmatizing attitudes. This is particularly valid for the endorsement of the mild encephalitis hypothesis of schizophrenia. Aim: To examine to what extent different causal explanations of schizophrenia influence the desire for social distance from persons with schizophrenia. Methods: A study with a prospective, quasi-experimental design was carried out with students in Germany (N = 333). A case vignette depicting a person with schizophrenia-typical symptoms was presented, and a social distance scale (SDS) was used to measure the stigmatizing attitude against the person described. Participants were randomly assigned to one of three groups receiving different causal explanations of schizophrenia (genetic, mild encephalitis hypothesis, or psychosocial) without treatment information. Results: A one-way ANOVA showed that the mean SDS was lowest in the group with the mild encephalitis hypothesis explanation, followed by the genetic explanation group, and highest in the psychosocial explanation group. However, the differences between the groups were small and not significant. A subanalysis revealed a significant interaction between gender and causal explanation. Women showed a significantly lower desire for social distance than men when receiving the mild encephalitis hypothesis. Neither the study discipline nor the number of semesters of study had significant effects on the mean SDS. The differences between the mean SDS scores for the different items were much bigger than the differences for the different causal explanations. Regardless of the causal explanation, the extent of the desired social distance depends strongly on social proximity. Conclusion: The present study fits into previous research, which has found that biogenetic beliefs were either associated with more social distance or did not yield a statistically significant association. Although we found a small gender-specific effect of the endorsement of the mild encephalitis hypothesis, we do not recommend gender-specific anti-stigmatization campaigns because they might rightly raise suspicions of dishonesty and manipulation. Rather we support recovery-oriented messages focusing on effective treatments.