Partial Reinforcement in a Bar-Pressing Situation with Preschool Children

Forty fifth- and sixth-grade children were given a list of names which they had prerated for Reinforcement Value in a free recall format. The prediction was made that high self-esteem children will learn their liked names more rapidly than their disliked names, but that low self-esteem children would show the reverse tendency. Although an RV-positive effect is noted in the sample, the expected reversal did not occur. A confounding factor proved to be intelligence, since it was impossible to divorce self-esteem from IQ in the sample investigated. The presentation closes with a discussion of the “logical learning theory” on which RV study is based, and the implications that this theory has for the role of self-induced behavior.     

Self-Cutting and Suicidal Ideation among Adolescents: Gender Differences in the Causes and Correlates of Self-Injury

In recent years, non-suicidal self-injury (NSSI) among adolescents has been identified as alarmingly common place. Some studies have suggested that more than one in eight adolescents have engaged in self-cutting or other self-injuring behaviors. Even more of a concern is that self-injury often foreshadows suicide or suicide attempts. With self-cutting common in middle and high schools, understanding the antecedents and correlates of such behavior may help counselors and others public health officials identify troubled students and initiate preventative measures. This study utilizes data from 2,639 high school students from the Delaware Youth Risk Behavior Survey to investigate the gender differences in NSSI and suicidal ideation. Overall, 13% reported engaging in NSSI within the past year, with females reporting significantly higher rates (17%) of NSSI than males (9%). Results indicate that there are significant gender differences in NSSI and suicidal thoughts based upon previous victimization experiences, reported substance use, depression, health behaviors, and sexual orientation.     

The general factor of personality and humor styles

The present study examined the phenotypic, genetic, and environmental correlations between a general factor of personality (GFP) and four humor styles: affiliative, self-enhancing, aggressive, and self-defeating. Participants were 571 same-sex adult twin pairs. Individuals completed the Humor Styles Questionnaire (HSQ) and a short form of the NEO personality scale (from which the GFP was extracted). The GFP was found to be heritable with an estimated value of .31. At the phenotypic level, the GFP was found to correlate significantly with the HSQ scales; positively with affiliative and self-enhancing, and negatively with aggressive and self-defeating. Three of the four phenotypic correlations were found to be attributable to correlated genetic factors, suggesting that these dimensions of humor styles and the GFP may have a common genetic factor.     

Expecting More in Relationships – Implications of Relational Entitlement

Abstract

Sense of relational entitlement refers to what individuals’ believe they “should” expect from their romantic partner. When expectations are both unrealistic and not met by one’s partner, there is a potential for adverse consequences. Researchers surveyed 195 female participants between the ages 18-60. The study examined the influence of one’s sense of relational entitlement with varying conflict strategies. The findings revealed that extreme forms of one’s sense of relational entitlement was associated with conflict strategies like verbal aggression, and control & domination. Thus, one’s sense of relational entitlement appears to play a significant role in how individuals handle conflict.     

Evolution of communication in perfect and imperfect worlds

We extend previous work on cooperation to some related questions regarding the evolution of simple forms of communication. The evolution of cooperation within the iterated Prisoner's Dilemma has been shown to follow different patterns, with significantly different outcomes, depending on whether the features of the model are classically perfect or stochastically imperfect (Axelrod, 1980a,b, 1984, 1985; Axelrod and Hamilton, 1981; Nowak and Sigmund, 1990, 1992; Sigmund, 1993). Our results here show that the same holds for communication. Within a simple model, the evolution of communication seems to require a stochastically imperfect world.     

Childhood Sexual Assault,Quality of Life,and Psychiatric Comorbidity in Veterans With Military and Civilian Sexual Trauma

Veterans with military sexual trauma (MST) are at risk for a variety of psychiatric conditions, including posttraumatic stress disorder (PTSD) and depression. Survivors of MST are also likely to experience diminished quality of life (QoL). Individuals with higher lifetime incidence of sexual trauma may also be at increased risk for poorer outcomes in QoL and psychiatric symptomatology. The differences in psychological sequelae among those who have experienced sexual trauma as children, and those whose sexual trauma exposure is limited to adulthood are relatively understudied. The majority of sexual trauma literature has focused primarily on civilian trauma, and comparatively few studies have specifically examined psychosocial sequelae (e.g., QoL) in veterans with MST. This study examined how childhood sexual abuse (CSA) affects overall QoL as well as severity of PTSD and depressive symptoms. Veterans who reported CSA had significantly greater depression symptom severity than veterans who did not. No significant differences in PTSD symptom severity or QoL were found between veterans who did and did not report CSA. Results highlight the need for further examination of the relationship between CSA and depression in veterans with MST-related PTSD who also report CSA.     

Instantiation is not partial identity

In order to avoid the problems faced by standard realist analyses of the “relation” of instantiation, Baxter and, following him, Armstrong each analyze the instantiation of a universal by a particular in terms of their partial identity. I introduce two related conceptions of partial identity, one mereological and one non-mereological, both of which require at least one of the relata of the partial identity “relation” to be complex. I then introduce a second non-mereological conception of partial identity, which allows for both relata to be simple. I take these three conceptions to exhaust the plausible ways of construing two entities as being partially identical. I then argue that there is no analysis (including those offered by Baxter and Armstrong) of a universal and a particular as being partially identical consistent with any of these three conceptions that (i) is coherent, (ii) is consistently realist, (iii) does not lead to absurd consequences, and (iv) offers a “solution” to the problem of instantiation that avoids the problems with the other standard realist responses. In so arguing, I offer a criticism of the analysis of instantiation as partial identity that is independent of the standard criticism that it entails the necessity of predication.     

Introspection and inference

In this paper I develop the idea that, by answering the question whether p, you can answer the question whether you believe that p. In particular, I argue that judging that p is a fallible yet basic guide to whether one believes that p. I go on to defend my view from an important skeptical challenge, according to which my view would make it too easy to reject skeptical hypotheses about our access to our minds. I close by responding to the opposing view on which our beliefs themselves constitute our only source of first-person access to our beliefs.     

Matching Methods for Selection of Participants for Follow-Up

This work examines ways to make the best use of limited resources when selecting individuals to follow up in a longitudinal study estimating causal effects. In the setting under consideration, covariate information is available for all individuals but outcomes have not yet been collected and may be expensive to gather, and thus only a subset of the comparison participants are followed. Expressions in Rubin and Thomas (1996) Rubin, D. B. and Thomas, N. 1996. Matching using estimated propensity scores, relating theory to practice.. Biometrics, 52: 249–264. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar] show the benefits that can be obtained, in terms of reduced bias and variance of the estimated treatment effect, of selecting comparison individuals well matched to those in the treated group compared with a random sample of comparison individuals. We primarily consider nonexperimental settings but also consider implications for randomized trials. The methods are illustrated using data from the Johns Hopkins University Baltimore Prevention Program, which included data collection from age 6 to young adulthood of participants in an evaluation of 2 early elementary-school-based universal prevention programs.     

Major memory for microblogs

Online social networking is vastly popular and permits its members to post their thoughts as microblogs, an opportunity that people exploit, on Facebook alone, over 30 million times an hour. Such trivial ephemera, one might think, should vanish quickly from memory; conversely, they may comprise the sort of information that our memories are tuned to recognize, if that which we readily generate, we also readily store. In the first two experiments, participants’ memory for Facebook posts was found to be strikingly stronger than their memory for human faces or sentences from books—a magnitude comparable to the difference in memory strength between amnesics and healthy controls. The second experiment suggested that this difference is not due to Facebook posts spontaneously generating social elaboration, because memory for posts is enhanced as much by adding social elaboration as is memory for book sentences. Our final experiment, using headlines, sentences, and reader comments from articles, suggested that the remarkable memory for microblogs is also not due to their completeness or simply their topic, but may be a more general phenomenon of their being the largely spontaneous and natural emanations of the human mind.