Response elimination: A comparison of four procedures

Four procedures for eliminating an operant response were compared within a multiple schedule. Response reduction was most rapid when reinforcement was provided for a specific alternative response. The decline in responding produced by extinction and differential reinforcement of other behavior was similar. Responding initially increased and then gradually decreased when reinforcers were delivered independently of responding at fixed times. Removal of reinforcement from the alternative-response and DRO procedures did not result in recovery of the target response. However, the shift from response-independent dilivery of reinforcers to extinction caused an initial increase in responding.     

Effects of Trauma of the Gulf War on Kuwaiti Children

We investigated the effects of the Gulf War on two groups of Kuwaiti children and youth. Those children experiencing war-related traumatic events and those who did not experience or witness a war-related traumatic event participated. Data were obtained from the mother of each child. Each mother completed a structured interview which included Child Traumatic Reaction Index, developed according to the DSM-IV (1994) criteria for Post Traumatic Stress Disorder (PTSD). The data indicated a significant interaction effect observed by mothers according to the child's gender, experience of war traumatic events, and PTSD. The results are discussed in terms of the diagnostic criteria for PTSD, the necessity of early identification, and the difficulty associated with the diagnosing PTSD in children.     

Ternary Exclusive Or

Ternary exclusive or is the (two valued) truth function thatis true just in case exactly one of its three arguments is true.This is an interesting truth function, not definable in termsof the binary exclusive or alone, although the binary case isdefinable in terms of the ternary case. This article investigatesthe types of truth functions that can be defined by ternaryexclusive or, and relates these findings to the seminal workof Emil Post.     

Contextualizing rape: Reviewing sequelae and proposing a culturally inclusive ecological model of sexual assault recovery

Consistent evidence demonstrates that many women who encounter the trauma of rape experience a range of both acute reactions and chronic psychological sequelae. This article reviews both the short- and long-term psychological adjustment issues associated with rape. In addition, we propose a culturally inclusive ecological model of sexual assault recovery (CIEMSAR), which integrates and extends existing models to better examine the complex factors leading to differential postrape adjustment. Important components of the CIEMSAR are placing rape in the broader sociocultural context of the United States and explicated socioracial and ethnic factors influencing the recovery process. The five primary factors of CIEMSAR are outlined, including (a) macrosystem or sociocultural context factors; microsystem/individual factors such as (b) assault characteristics, (c) person variables, (d) coping responses; and mesosystems factors such as (e) social-support systems. Suggestions for future research are also provided.     

Social relationships and social support among post‐war youth in Northern Uganda

Although social relationships and social support are salient factors for post‐war adolescents' psychosocial coping and adjustment, there is only limited information regarding war‐affected adolescents' views on social support and the relationships within which social support is provided. This study therefore explored both elements among a clinical sample of 20 adolescents living in post‐war Northern Uganda. Following Braun and Clarke's thematic analysis, we found a prominent role of the biological mother and other primary biological family members in the upbringing of our participants. Spiritual and material support were perceived to be the most important type of support, respectively, while the adolescents were growing up and in their current lives. These findings provide support for the perception that caregiving systems are adaptable to particular sociocultural contexts. Further, the importance of particular functions of social support could signify a potentially selective buffering effect of these functions in adverse contexts. Because of the importance of the primary biological family and the salient role of parent–child relationships in the face of adversity, future research needs to focus on this particular kind of social relationship in contexts of prolonged collective violence.     

Mean Streets and Mental Health: Depression and Post‐Traumatic Stress Disorder at Crime Hot Spots

This study explores the relationship between mental health and place at microgeographic units of analysis. We examine self‐reported symptomology for depression and PTSD for 2,724 survey respondents interviewed in three types of randomly selected street segments: violent crime hot spots, cool spots, and cold spots. We find that the mean symptomology score is 61% higher for depression in violent crime hot spots than cold spots, and 85% higher for PTSD. Overall, we estimate that 14.8% of residents of violent crime hot spots meet thresholds for moderate depression or a diagnosis of PTSD. This can be compared to only 6.5% of residents at the cold spots. Using PSM and weighted negative binomial regression approaches we show that observable selection factors are not responsible for the relationships identified. Examining geographic influences, we find an important area effect of violent crime for both mental health measures, and an additional impact of the specific street of residence for PTSD.     

后基因组时代的医学发展

1990年,美国正式启动“人类基因组计划”。随着这项工程成果的不断取得,人类即将进入利用、使用“人类基因组计划”成果的“后基因组时代”。在这个时代,基因芯片和基因工程技术将被广泛地使用在医学科学中,给医学科学的发展带来一场深刻的革命。同时医学科学也将面临着前所未有的冲突和抉择。充分认识这些问题,对寻求现实医学科学的发展途径具有重要的启示意义。     

Stripped of illusions? Exploring system justification processes in capitalist and post‐Communist societies

Sociologists and political scientists have often observed that citizens of Central and Eastern Europe express high levels of disillusionment with their social, economic and political systems, in comparison with citizens of Western capitalist societies. In this review, we analyze system legitimation and delegitimation in post‐Communist societies from a social psychological perspective. We draw on system justification theory, which seeks to understand how, when and why people do (and do not) defend, bolster and justify existing social systems. We review some of the major tenets and findings of the theory and compare research on system‐justifying beliefs and ideologies in traditionally Capitalist and post‐Communist countries to determine: (1) whether there are robust differences in the degree of system justification in post‐Communist and Capitalist societies, and (2) the extent to which hypotheses derived from system justification theory receive support in the post‐Communist context. To this end, we summarize research findings from over 20 countries and cite previously unpublished data from a public opinion survey conducted in Poland. Our analysis confirms that there are lower levels of system justification in post‐Communist countries. At the same time, we find that system justification possesses similar social and psychological antecedents, manifestations and consequences in the two types of societies. We offer potential explanations for these somewhat complicated patterns of results and conclude by addressing implications for theory and research on system justification and system change (or transition).     

The Latent Threat of Community Violence: Indirect Exposure to Local Homicides and Adolescents’ Mental Health in Colombia

This study examines the relation between adolescents’ indirect exposure to local homicides and mental health disorders and post‐traumatic stress disorder (PTSD) symptoms. We employ a sample of 300 adolescents ( representative for Bogotá, Colombia, and geocoded data on violent crimes recorded by the national police. Findings show that one SD increment in local homicides is associated with increments by 0.17 SD in the mental health disorder index and a 0.14 SD increase in the PTSD score index, even after accounting for adolescents’ direct exposure to violence. The estimated effect for PTSD was larger for adolescents’ who were directly exposed to violence and for those living in multidimensionally poor households, whereas no detectable effects were found for adolescents who perceived their residential neighborhood as relatively safe.