Chris R. Brewin

Bio: Chris R. Brewin is an academic researcher from University College London. The author has contributed to research in topics: Autobiographical memory & Mental health. The author has an hindex of 92, co-authored 389 publications receiving 36517 citations. Previous affiliations of Chris R. Brewin include Medical Research Council & Institut Philippe Pinel de Montréal.

Meta-analysis of risk factors for posttraumatic stress disorder in trauma-exposed adults.

Abstract: Meta-analyses were conducted on 14 separate risk factors for posttraumatic stress disorder (PTSD), and the moderating effects of various sample and study characteristics, including civilian/military status, were examined. Three categories of risk factor emerged: Factors such as gender, age at trauma, and race that predicted PTSD in some populations but not in others; factors such as education, previous trauma, and general childhood adversity that predicted PTSD more consistently but to a varying extent according to the populations studied and the methods used; and factors such as psychiatric history, reported childhood abuse, and family psychiatric history that had more uniform predictive effects. Individually, the effect size of all the risk factors was modest, but factors operating during or after the trauma, such as trauma severity, lack of social support, and additional life stress, had somewhat stronger effects than pretrauma factors.

A dual representation theory of posttraumatic stress disorder.

Abstract: A cognitive theory of post traumatic stress disorder (PTSD) is proposed that assumes traumas experienced after early childhood give rise to 2 sorts of memory, 1 verbally accessible and 1 automatically accessible through appropriate situational cues. These different types of memory are used to explain the complex phenomenology of PTSD, including the experiences of reliving the traumatic event and of emotionally processing the trauma. The theory considers 3 possible outcomes of the emotional processing of trauma, successful completion, chronic processing, and premature inhibition of processing. We discuss the implications of the theory for research design, clinical practice, and resolving contradictions in the empirical data.

Psychopathology and early experience: a reappraisal of retrospective reports.

Abstract: Three potential sources of error in retrospective reports of childhood experiences are documented: low reliability and validity of autobiographical memory in general, the presence of general memory impairment associated with psychopathology, and the presence of specific mood-congruent memory biases associated with psychopathology. The evidence reviewed suggests that claims concerning the general unreliability of retrospective reports are exaggerated and that there is little reason to link psychiatric status with less reliable or less valid recall of early experiences. Nevertheless, it is clear that steps must be taken to overcome the limitations of retrospective reports and enhance their reliability.

Weighing the Costs of Disaster: Consequences, Risks, and Resilience in Individuals, Families, and Communities

Abstract: Disasters typically strike quickly and cause great harm. Unfortunately, because of the spontaneous and chaotic nature of disasters, the psychological consequences have proved exceedingly difficult to assess. Published reports have often overestimated a disaster's psychological cost to survivors, suggesting, for example, that many if not most survivors will develop posttraumatic stress disorder (PTSD); at the same time, these reports have underestimated the scope of the disaster's broader impact in other domains. We argue that such ambiguities can be attributed to methodological limitations. When we focus on only the most scientifically sound research--studies that use prospective designs or include multivariate analyses of predictor and outcome measures--relatively clear conclusions about the psychological parameters of disasters emerge. We summarize the major aspects of these conclusions in five key points and close with a brief review of possible implications these points suggest for disaster intervention. 1. Disasters cause serious psychological harm in a minority of exposed individuals. People exposed to disaster show myriad psychological problems, including PTSD, grief, depression, anxiety, stress-related health costs, substance abuse, and suicidal ideation. However, severe levels of these problems are typically observed only in a relatively small minority of exposed individuals. In adults, the proportion rarely exceeds 30% of most samples, and in the vast majority of methodologically sound studies, the level is usually considerably lower. Among youth, elevated symptoms are common in the first few months following a high-impact disaster, but again, chronic symptom elevations rarely exceed 30% of the youth sampled. 2. Disasters produce multiple patterns of outcome, including psychological resilience. In addition to chronic dysfunction, other patterns of disaster outcome are typically observed. Some survivors recover their psychological equilibrium within a period ranging from several months to 1 or 2 years. A sizeable proportion, often more than half of those exposed, experience only transient distress and maintain a stable trajectory of healthy functioning or resilience. Resilient outcomes have been evidenced across different methodologies, including recent studies that identified patterns of outcome using relatively sophisticated data analytic approaches, such as latent growth mixture modeling. 3. Disaster outcome depends on a combination of risk and resilience factors. As is true for most highly aversive events, individual differences in disaster outcomes are informed by a number of unique risk and resilience factors, including variables related to the context in which the disaster occurs, variables related to proximal exposure during the disaster, and variables related to distal exposure in the disaster's aftermath. Multivariate studies indicate that there is no one single dominant predictor of disaster outcomes. Rather, as with traumatic life events more generally, most predictor variables exert small to moderate effects, and it is the combination or additive total of risk and resilience factors that informs disaster outcomes. 4. Disasters put families, neighborhoods, and communities at risk. Although methodologically complex research on this facet of disasters' impact is limited, the available literature suggests that disasters meaningfully influence relationships within and across broad social units. Survivors often receive immediate support from their families, relatives, and friends, and for this reason many survivors subsequently claim that the experience brought them closer together. On the whole, however, the empirical evidence suggests a mixed pattern of findings. There is evidence that social relationships can improve after disasters, especially within the immediate family. However, the bulk of evidence indicates that the stress of disasters can erode both interpersonal relationships and sense of community. Regardless of how they are affected, postdisaster social relations are important predictors of coping success and resilience. 5. The remote effects of a disaster in unexposed populations are generally limited and transient. Increased incidence of extreme distress and pathology are often reported in remote regions hundreds if not thousands of miles from a disaster's geographic locale. Careful review of these studies indicates, however, that people in regions remote to a disaster may experience transient distress, but increased incidence of psychopathology is likely only among populations with preexisting vulnerabilities (e.g., prior trauma or psychiatric illness) or actual remote exposure (e.g., loss of a loved one in the disaster). Finally, we review the implications for intervention. There is considerable interest in prophylactic psychological interventions, such as critical incident stress debriefing (CISD), that can be applied globally to all exposed survivors in the immediate aftermath of disaster. Multiple studies have shown, however, that CISD is not only ineffective but in some cases can actually be psychologically harmful. Other less invasive and more practical forms of immediate intervention have been developed for use with both children and adults. Although promising, controlled evaluations of these less invasive interventions are not yet available. The available research suggests that psychological interventions are more likely to be effective during the short- and long-term recovery periods (1 month to several years postdisaster), especially when used in combination with some form of screening for at-risk individuals. Such interventions should also target the maintenance and enhancement of tangible, informational, and social-emotional support resources throughout the affected community. Language: en

Using Multivariate Statistics

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Remembering. A Study in Experimental and Social Psychology, Cambridge (University Press) 1964.

Abstract: Part I. Experimental Studies: 2. Experiment in psychology 3. Experiments on perceiving III Experiments on imaging 4-8. Experiments on remembering: (a) The method of description (b) The method of repeated reproduction (c) The method of picture writing (d) The method of serial reproduction (e) The method of serial reproduction picture material 9. Perceiving, recognizing, remembering 10. A theory of remembering 11. Images and their functions 12. Meaning Part II. Remembering as a Study in Social Psychology: 13. Social psychology 14. Social psychology and the matter of recall 15. Social psychology and the manner of recall 16. Conventionalism 17. The notion of a collective unconscious 18. The basis of social recall 19. A summary and some conclusions.

Psychosocial Resilience and Protective Mechanisms

Abstract: The concept of mechanisms that protect people against the psychological risks associated with adversity is discussed in relation to four main processes: reduction of risk impact, reduction of negative chain reactions, establishment and maintenance of self-esteem and self-efficacy, and opening up of opportunities. The mechanisms operating at key turning points in people's lives must be given special attention.