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Excessive aggression as model of violence: a critical evaluation of current preclinical methods.

ABSTRACT: Preclinical experimental models of pathological aggressive behavior are a sorely understudied and difficult research area.How valid, reliable, productive, and informative are the most frequently used animal models of excessive aggressive behavior?The rationale, key methodological features, supporting data, and arguments as well as their disadvantages and limitations of the most frequently used animal models for excessive aggressive behavior are summarized and their validity and reliability are evaluated.Excessive aggressive behavior is validly and reliably seen in (1) a proportion of feral-derived rats and selectively bred mice; (2) rats with compromised adrenal function resulting in a hypoglucocorticoid state; (3) a significant minority of mice, rats, and monkeys after consumption of a moderate dose of alcohol; and (4) resident animals of various species after social instigation. Limitations of these procedures include restrictive animal research regulations, the requirement of expertise in surgical, pharmacological, and behavioral techniques, and the behaviorally impoverished mouse strains that are used in molecular genetics research. Promising recent initiatives for novel experimental models include aggressive behaviors that are evoked by optogenetic stimulation and induced by the manipulation of early social experiences such as isolation rearing or social stress.One of the most significant challenges for animal models of excessive, potentially abnormal aggressive behavior is the characterization of distinctive neurobiological mechanisms that differ from those governing species-typical aggressive behavior. Identifying novel targets for effective intervention requires increased understanding of the distinctive molecular, cellular, and circuit mechanisms for each type of abnormal aggressive behavior.

SUBMITTER: Miczek KA

PROVIDER: S-EPMC3595336 | biostudies-literature | 2013 Apr

REPOSITORIES: biostudies-literature

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Excessive aggression as model of violence: a critical evaluation of current preclinical methods.

Miczek Klaus A KA de Boer Sietse F SF Haller Jozsef J Haller Jozsef J

Psychopharmacology 20130221 3

<h4>Rationale</h4>Preclinical experimental models of pathological aggressive behavior are a sorely understudied and difficult research area.<h4>Objectives</h4>How valid, reliable, productive, and informative are the most frequently used animal models of excessive aggressive behavior?<h4>Methods</h4>The rationale, key methodological features, supporting data, and arguments as well as their disadvantages and limitations of the most frequently used animal models for excessive aggressive behavior ar ...[more]

PMID: 23430160

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Project description:BackgroundViolence towards staff working in psychiatric inpatient care is a serious problem. The aim of the present study was to explore staff perspectives of serious violent incidents involving psychiatric inpatients through the following research questions: Which factors contributed to violent incidents, according to staff? How do staff describe their actions and experiences during and after violent incidents?MethodsWe collected data via a questionnaire with open-ended questions, and captured 283 incidents reported by 181 staff members from 10 inpatient psychiatric wards in four different regions. We used the Critical Incident Technique to analyse the material. Our structural analysis started by structuring extracts from the critical incidents into descriptions, which were grouped into three chronological units of analyses: before the incident, during the incident and after the incident. Thereafter, we categorised all descriptions into subcategories, categories and main areas.ResultsStaff members often attributed aggression and violence to internal patient factors rather than situational/relational or organisational factors. The descriptions of violent acts included verbal threats, serious assault and death threats. In addition to coercive measures and removal of patients from the ward, staff often dealt with these incidents using other active measures rather than passive defence or de-escalation. The main effects of violent incidents on staff were psychological and emotional. After violent incidents, staff had to continue caring for patients, and colleagues provided support. Support from managers was reported more rarely and staff expressed some dissatisfaction with the management.ConclusionsAs a primary prevention effort, it is important to raise awareness that external factors (organisational, situational and relational) are important causes of violence and may be easier to modify than internal patient factors. A secondary prevention approach could be to improve staff competence in the use of de-escalation techniques. An important tertiary prevention measure would be for management to follow up with staff regularly after violent incidents and to increase psychological support in such situations.

Project description:Rural/remote health services are vulnerable to occupational violence and aggression due to factors such as weapon accessibility, poor network coverage and distance to backup. This systematic review investigated (1) the nature of occupational violence and aggression perpetrated in rural/remote health service urgent care settings and (2) the availability and effectiveness of policies/interventions/recommendations that address occupational violence and aggression in this context. We searched Business Source Complete, CINAHL Complete, Health & Society, APAIS Health, Health Collection, PsycINFO, PubMed, Scopus, SocIndex and Web of Science. Included articles (peer-reviewed, no grey literature and English language) addressed occupational violence and aggression in rural health service urgent care settings. Fifteen articles matched these criteria (total [rural/remote only, where specified] N ~ 2555) and were included in the final analysis. The Mixed Methods Appraisal Tool was applied to assess the risk of bias. A data extraction table and narrative synthesis are presented. The most common occupational violence and aggression type was verbal aggression. The primary perpetrator was patients. Risk factors reflected practitioner age, remoteness, sector, staffing, shift type and area of practice. Precipitating factors were alcohol/drugs, dissatisfaction and mental health conditions. Policy content and limitations and education/training programme effectiveness were not addressed. Community collaboration supported occupational violence and aggression prevention/management. Organisational culture should promote reporting, debriefing and post-incident care for staff well-being. Work environment and job/task design are priorities for safety, but with possible limitations for traumatised clients. Occupational violence and aggression policies/interventions in rural health settings must be systematically evaluated to inform best practices. Co-funded by Swinburne Social Innovation Research Institute Interdisciplinary Seed Funding Scheme and SMART Rural Health Network.

Project description:Overlapping peaks in Raman spectra complicate the presentation, interpretation, and analyses of complex samples. This is particularly problematic for methods dependent on sparsity such as multivariate curve resolution and other spectral demixing as well as for two-dimensional correlation spectroscopy (2D-COS), multisource correlation analysis, and principal component analysis. Though software-based resolution enhancement methods can be used to counter such problems, their performances often differ, thereby rendering some more suitable than others for specific tasks. Furthermore, there is a need for automated methods to apply to large numbers of varied hyperspectral data sets containing multiple overlapping peaks, and thus methods ideally suitable for diverse tasks. To investigate these issues, we implemented three novel resolution enhancement methods based on pseudospectra, over-deconvolution, and peak fitting to evaluate them along with three extant methods: node narrowing, blind deconvolution, and the general-purpose peak fitting program Fityk. We first applied the methods to varied synthetic spectra, each consisting of nine overlapping Voigt profile peaks. Improved spectral resolution was evaluated based on several criteria including the separation of overlapping peaks and the preservation of true peak intensities in resolution-enhanced spectra. We then investigated the efficacy of these methods to improve the resolution of measured Raman spectra. High resolution spectra of glucose acquired with a narrow spectrometer slit were compared to ones using a wide slit that degraded the spectral resolution. We also determined the effects of the different resolution enhancement methods on 2D-COS and on chemical contrast image generation from mammalian cell spectra. We conclude with a discussion of the particular benefits, drawbacks, and potential of these methods. Our efforts provided insight into the need for effective resolution enhancement approaches, the feasibility of these methods for automation, the nature of the problems currently limiting their use, and in particular those aspects that need improvement.

Dataset Information

Excessive aggression as model of violence: a critical evaluation of current preclinical methods.

Publications

Excessive aggression as model of violence: a critical evaluation of current preclinical methods.

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