Dissociative Identity Disorder: A Review of Research From 2011 to 2021.

ABSTRACT: Dissociative identity disorder (DID) has historically been one of the most controversial topics in the study of psychopathology. Building on a previous review of empirical research on DID from 2000 to 2010, the present review examined DID research from 2011 to 2021. The research output included 56 case studies and 104 empirical studies. Within the empirical studies, approximately 1354 new cases of DID emerged, which resulted in an average samples of approximately 20. Reanalysis of previous samples was standard in the literature with only 40% of reported cases being new. Studies emerged from dozens of countries across the world, but the majority of cases were from Western counties, especially the United States. Diagnosis primarily relied upon validated measures, but 74% of all new cases came from six research groups. Overall, research on DID is steady but methodologically limited in ways that make generalization, especially about etiology, difficult.

The racial stereotype about mental illness.

The current research examined the interaction of race and mental illness stereotypes to determine if there is a racial stereotype about mental illness. Study 1 (N = 144) showed that participants predominantly imagined White people when thinking about mental disorders and rated mental disorders as most typical of Whites. Participants in Study 2 (N = 162) rated Whites as best fitting their image of patient in a mental hospital. Study 3 (N = 510) demonstrated that the White racial stereotype of mental illness occurs across races but that it is significantly less common among nonwhites. Participants in Study 4 (N = 279) perceived mental illness as least likely among Asians, followed by Blacks and Whites. The results show that people stereotypically associate mental illness more with Whites than other races. Such a belief could help to explain racial discrepancies in mental health care and the interpretation of problematic behaviors.

Evidence for a gender stereotype about psychology and its effect on perceptions of men's and women's fit in the field.

The current research explored the gender stereotype about psychology and its effect on perceptions of people's fit in the field. Across six studies (N = 1,516), results showed that participants believed that women represent the majority of people in both the major and profession of psychology. Also, participants associated psychology more strongly with femininity than masculinity and assigned more feminine and less masculine traits to people studying psychology than to people studying a stereotypically masculine career. In terms of fit within the field, participants rated psychology as less likely to meet the needs of men compared to women, especially after learning that the field was majority women. Overall, the studies provide evidence for an association between femininity and psychology and suggest that the stereotype affects perceptions of men's and women's fit within the field.

Evidence for blatant dehumanization of mental illness and its relation to stigma.

People with mental illness face stigma, and due to their low social status, they may also face blatant dehumanization that denies their status as fully evolved human beings. In the current research, three studies documented the existence of blatant dehumanization of mental illness. Study 1 (N = 112) showed that participants rated people with mental illness in general as being significantly less human than other dehumanized social groups such as Mexican immigrants and Muslims. Study 2 (N = 158) showed that dehumanization occurs for specific mental disorders but that the level of dehumanization varies widely among disorders. Study 3 (N = 223) documented significant correlations between dehumanization of mental illness and standard measures of stigma such as fear, pity, and social distance. Overall, the results establish the relevance of blatant dehumanization to mental illness stigma and suggest new directions for understanding stigma.

Exploring the relation between masculinity and mental illness stigma using the stereotype content model and BIAS map.

The current research explored the association of masculinity and stigma toward mental illness using theoretical predictions stemming from the stereotype content model and BIAS map. Two correlational studies (Ns = 245, 163) measured stereotypes, emotions, and behavioral intentions in relation to masculine, feminine, and gender-neutral disorders. Participants perceived masculine disorders as lacking personal warmth and competence. Masculine disorders also elicited more negative emotions and behavioral intentions. Two experimental studies (Ns = 161, 431) manipulated personal warmth, sex, and type of disorder in descriptions of people with mental illness. Low warmth and stereotypically masculine disorders consistently elicited negative emotions and behavioral intentions, but sex had limited effects. Overall, the results supported the theoretical models and illustrated the importance of warmth and symptomatic behavior in explaining the masculinity-stigma relation.

Simulation of multiple personalities: a review of research comparing diagnosed and simulated dissociative identity disorder.

Dissociative Identity Disorder (DID) has long been surrounded by controversy due to disagreement about its etiology and the validity of its associated phenomena. Researchers have conducted studies comparing people diagnosed with DID and people simulating DID in order to better understand the disorder. The current research presents a systematic review of this DID simulation research. The literature consists of 20 studies and contains several replicated findings. Replicated differences between the groups include symptom presentation, identity presentation, and cognitive processing deficits. Replicated similarities between the groups include interidentity transfer of information as shown by measures of recall, recognition, and priming. Despite some consistent findings, this research literature is hindered by methodological flaws that reduce experimental validity.

A review of published research on adult dissociative identity disorder: 2000-2010.

The purpose of this study was to assess the scientific and etiological status of dissociative identity disorder (DID) by examining cases published from 2000 to 2010. In terms of scientific status, DID is a small but ongoing field of study. The review yielded 21 case studies and 80 empirical studies, presenting data on 1171 new cases of DID. A mean of 9 articles, each containing a mean of 17 new cases of DID, emerged each year. In terms of etiological status, many of the central criticisms of the disorder's validity remain unaddressed. Most cases of DID emerged from a small number of countries and clinicians. In addition, documented cases occurring outside treatment were almost nonexistent. Finally, people simulating DID in the laboratory were mostly indistinguishable from individuals with DID. Overall, DID is still a topic of study, but the research lacks the productivity and focus needed to resolve ongoing controversies surrounding the disorder.

The scientific status of childhood dissociative identity disorder: a review of published research.

BACKGROUND: Dissociative identity disorder (DID) remains a controversial diagnosis due to conflicting views on its etiology. Some attribute DID to childhood trauma and others attribute it to iatrogenesis. The purpose of this article is to review the published cases of childhood DID in order to evaluate its scientific status, and to answer research questions related to the etiological models. METHODS: I searched MEDLINE and PsycINFO records for studies published since 1980 on DID/multiple personality disorder in children. For each study I coded information regarding the origin of samples and diagnostic methods. RESULTS: The review produced a total of 255 cases of childhood DID reported as individual case studies (44) or aggregated into empirical studies (211). Nearly all cases (93%) emerged from samples of children in treatment, and multiple personalities was the presenting problem in 23% of the case studies. Four US research groups accounted for 65% of all 255 cases. Diagnostic methods typically included clinical evaluation based on Diagnostic and Statistical Manual of Mental Disorder criteria, but hypnosis, structured interviews, and multiple raters were rarely used in diagnoses. CONCLUSION: Despite continuing research on the related concepts of trauma and dissociation, childhood DID itself appears to be an extremely rare phenomenon that few researchers have studied in depth. Nearly all of the research that does exist on childhood DID is from the 1980s and 1990s and does not resolve the ongoing controversies surrounding the disorder.

Biological explanations and stigmatizing attitudes: using essentialism and perceived dangerousness to predict antistigma intervention effectiveness.

The theory of essentialism suggests that biological explanations of stigmatized behavior may not be effective at decreasing stigmatizing attitudes. The effects of biological explanations on stigmatizing attitudes were the topic of two experiments. In the first experiment, participants (N = 243) perceived a biological explanation as a less effective in relation to dangerousness and social distancing attitudes about mental illness than about homosexuality. The second experiment (N = 113) compared the effect of biological and free choice explanations on stigmatizing attitudes about abnormal sexual and eating behaviors. The results indicated that a biological explanation increased belief in essentialism and was most effective for attitudes related to anger and blame. These results suggest that the effectiveness of biological explanations as an antistigma tool varies according to the attitude and stigmatized group.