The logic of probabilistic knowledge

Philosophical Studies - Sarah Moss’ thesis that we have probabilistic knowledge is from some perspectives unsurprising and from other perspectives hard to make sense of. The thesis is...     

Does the use of mobile phones affect human short‐term memory or attention?

The effect of acute exposure to low‐level radio frequency electromagnetic fields (REF) generated by mobile phones on short‐term memory and attention was assessed in two experiments. Most of the tests manipulated task difficulty or what might be termed cognitive load. This manipulation is important since previous studies have argued that exposure to mobile phones might affect cognitive functions only under conditions which tax the cognitive system. All participants were exposed to REF (half were exposed to GSM—Global System for Mobile Communication—signals and the other half were exposed to unmodulated signals) in one testing session, while in a separate session participants were exposed to sham signals. To investigate potential lateralised effects, the mobile phone was positioned on the left side of the head for half of the participants and on the right side for the other half. No significant effect of exposure to REF was detected in any of the six tasks used in either the low or high cognitive load conditions. This study used much larger sample sizes than is typical for this type of research and REF exposure was administered under double‐blind conditions. Overall, the results indicate that acute exposure to REFs emitted by mobile phones do not have a strong impact on cognitive functions. Copyright © 2007 John Wiley & Sons, Ltd.     

Hookups and sexual regret among college women

Research has suggested that women are prone to sexual regrets of action. In the present study, the authors examined "hooking up" as a predictor of sexual regret in 152 sexually active college women. Results indicate that two sexual behaviors were particularly predictive of participants' regret: (a) engaging in sexual intercourse with someone once and only once and (b) engaging in intercourse with someone known for less than 24 hr. Noncoital hookups (performing and receiving oral sex) were not significantly related to regret, indicating that college women may be underestimating the health risks associated with oral sex. Although hookups are a common feature of contemporary college life, the results counter the popular assumption that hookups are inconsequential for college women. The authors discuss the preventative health implications of their findings.     

Facial affect interpretation in boys with attention deficit/hyperactivity disorder.

Recent studies have produced mixed evidence of impairments in facial affect interpretation for children with attention deficit/hyperactivity disorder (ADHD). This study investigated the presence and nature of such impairments across different stimulus formats. Twenty-four boys with ADHD and 24 age-matched comparison boys completed a 72-trial task that included facial expressions of happiness, sadness, fear, anger, surprise, and disgust. Three versions of each expression were used: a static version, a dynamic version, and a dynamic version presented within a relevant situational context. Expressions were also presented in one of two portrayal modes (cartoon versus real-life). Results indicated significant impairments for boys with ADHD on two of the six emotions (fear and disgust), which were consistent across stimulus formats. Directions for further research to identify mediating factors in the expression of such impairments in children with ADHD are discussed.     

Potential Positive and Negative Consequences of Coresidence for Teen Mothers and their Children in Adult-Supervised Households

In 1996, part of the creation of TANF (Temporary Assistance for Needy Families) required minor teen parents to live in an adult-supervised household in order to receive cash assistance. This literature review discusses the positive and negative consequences of coresidence. Research has suggested that coresidence may be beneficial for the educational and financial success of teen mothers. However, there is some evidence that coresiding teen mothers have poorer parenting skills than teen mothers who do not coreside. Implications for policy implementation are discussed. Case managers should be aware of the possible risks of coresidence and weigh these risks against potential benefits. In addition, families of teen mothers, especially grandmothers, should be included in programming and interventions in order to provide positive living environments for teen mothers and their children.     

Perceptions of Family Relationship Factors and Depressive Symptoms in Adolescents: What Roles Do Parents and Gender Play?

The association of adolescents’ perceptions of family relationships and adolescent depressive symptoms was investigated using a sample of 2,918 youth participating in the National Longitudinal Survey of Youth 1997. Boys showed fewer depressive symptoms than girls, as hypothesized. In general, adolescents’ perceptions of family relationships were negatively related to depressive symptoms. Mother support of father predicted depressive symptoms for girls only, whereas father support of mother predicted depressive symptoms for boys only. These findings contradict previous research that suggested family functioning is more related to outcomes of adolescent girls than boys. Suggestions for future research and implications for marital and family therapists are discussed.     

Application of a Sensemaking Approach to Ethics Training in the Physical Sciences and Engineering

Integrity is a critical determinant of the effectiveness of research organizations in terms of producing high quality research and educating the new generation of scientists. A number of responsible conduct of research (RCR) training programs have been developed to address this growing organizational concern. However, in spite of a significant body of research in ethics training, it is still unknown which approach has the highest potential to enhance researchers' integrity. One of the approaches showing some promise in improving researchers' integrity has focused on the development of ethical decision-making skills. The current effort proposes a novel curriculum that focuses on broad metacognitive reasoning strategies researchers use when making sense of day-to-day social and professional practices that have ethical implications for the physical sciences and engineering. This sensemaking training has been implemented in a professional sample of scientists conducting research in electrical engineering, atmospheric and computer sciences at a large multi-cultural, multi-disciplinary, and multi-university research center. A pre-post design was used to assess training effectiveness using scenario-based ethical decision-making measures. The training resulted in enhanced ethical decision-making of researchers in relation to four ethical conduct areas, namely data management, study conduct, professional practices, and business practices. In addition, sensemaking training led to researchers' preference for decisions involving the application of the broad metacognitive reasoning strategies. Individual trainee and training characteristics were used to explain the study findings. Broad implications of the findings for ethics training development, implementation, and evaluation in the sciences are discussed.     

Latent Trait Modeling with the Common beliefs Survey III: Using Item Response Theory to Evaluate an Irrational Beliefs Inventory

Assessment of irrational beliefs by such measures as the Common Beliefs Survey III (CBS) has traditionally relied upon classical test theory assumptions, in which the properties of specific test items are less important than the total test score as the aggregate of all item responses. An alternative approach using item response theory (IRT) methodology allows one to specify the parameters of difficulty and discrimination for each test item. Difficulty levels of CBS items range along a continuum of irrationality, the implied latent trait measured by responses to the questionnaire as a whole. We evaluated the CBS responses of 605 individuals from clinical and college settings, drawing from current and archival data. The original Likert scale ratings were recoded into dichotomous scores. Fourteen of the 54 items were highly or very highly discriminating in distinguishing respondents with high and low irrationality levels. However, discriminating items exhibited a very narrow range of difficulty; most functioned at a point a little above the halfway mark on the continuum of irrationality. Item characteristic curves and test information curves were very similar for female (n = 424) and male (n = 179) respondents. We derived a 4-item screening test for irrationality from our IRT analyses of the 54 CBS items. Further test development, focused on the selection and scaling of items with a much broader range of difficulty, would facilitate evaluation of the hierarchical structure of irrational beliefs. Portions of this paper were presented at the 39th Annual Convention of the Association for Behavioral and Cognitive Therapies, Washington, DC, November, 2005.     

Movement abnormalities and the progression of prodromal symptomatology in adolescents at risk for psychotic disorders

The link between movement abnormalities and psychotic disorders is presumed to reflect common neural mechanisms that influence both motor functions and vulnerability to psychosis. The prodromal period leading to psychotic disorders represents both a viable point for intervention and a developmental period that, if studied, could shed light on etiology; however, no published studies have examined the temporal progression of this link. A group with high levels of prodromal symptomatology (i.e., adolescents with schizotypal personality disorder [SPD]; n = 42) and both psychiatric controls (with other personality disorders or conduct disorder [OD]; n = 30) and nonpsychiatric controls ([NC]; n = 49) were recruited. Videotapes of structured psychiatric interviews were coded for movement abnormalities by raters blind to participants' diagnostic status, and follow-up assessments were conducted 1 year later. Controlling for psychotropic medications, the authors found that adolescents with SPD exhibited significantly more motor abnormalities in the face and upper body than did OD and NC controls. At baseline, movement abnormalities were positively correlated with the severity of positive, negative, and total prodromal symptoms. Within the SPD group, baseline movement abnormalities predicted symptom severity 1 year later. Movement abnormalities represent an early risk indicator that may be predictive of later symptom severity and potentially of psychosis onset.