Intellectual similarity of virtual twin pairs: Developmental trends

Virtual twins (VTs) are same-age unrelated siblings reared together from infancy who replicate twinship, but without the genetic relatedness. A 2005 report from the ongoing Fullerton Virtual Twin Study found an IQ intraclass correlation of .26 (p < .01, n = 113 pairs) and a within-pair difference of 13.22 IQ points. The average age of VTs in that study was 8.10 years (SD = 8.56, range: 4.01-54.84 years). An opportunity to retest members of 43 VT pairs, 1.70-8.96 years after their time 1 assessment, allowed additional analyses of genetic and environmental influences underlying general intellectual development. A decrease in the VT IQ correlation and an increase in the within-pair difference were indicated, consistent with increasing genetic and/or non-shared environmental influences and decreasing shared environmental influence on general intellectual development throughout childhood.     

A treatment trial of an information package to help patients accept new dentures

Intolerance of dentures can be very distressing and difficult to treat. Therefore, 44 patients, having had partial or total dental clearance, completed the Brief Symptom (Psychiatric) Inventory, the Hospital Anxiety and Depression Scale and the Satisfaction with Life Scale. Allocated alternately, each patient had treatment as usual or watched a video containing information, recapitulated in a leaflet, based on the Self Regulatory Model of health beliefs explaining the experiences of wearing dentures and how to tolerate them. They were then fitted with dentures. Two and six weeks later, although both groups expressed favourable expectations of their dentures, the control group deteriorated continually on all measures, correlated with a decline in self-reported dental functioning. The video group improved on all measures except Satisfaction with Life. Therefore, our study is unique in showing that appropriate management of patients can arrest (1) clinically significant distress which can be occasioned by the replacement of teeth by dentures and (2) the development of complaints which may be seen as spurious. Experimental procedures are suggested to determine the influences which have brought this about in our study.     

A reanalysis of the personal/impersonal distinction in moral psychology research

Greene and colleagues [Greene, J., Sommerville, B. R., Nystrom, L. E., Darley, J. M., & Cohen, J. D. (2001). An fMRI investigation of emotional engagement in moral judgment. Science, 293, 2105-2108.] have revealed an apparent distinction in folk psychology between ‘up close and personal’ and ‘impersonal’ moral dilemmas. Reasoning about these types of dilemmas is purportedly supported by partially dissociable neural systems. However, further investigation of the data supporting this hypothesis indicated that only a small number of stimuli used by Greene et al. are driving the effect originally found. Implications of the apparent distinction initially reported and of other research in the domain of moral psychology are discussed.     

Sex and aggression during rhesus monkey group formation

Observational data from 16 newly formed social groups of rhesus monkeys were analyzed to identify patterns of behavior that correlated with the frequency and intensity of aggression directed toward females. The results revealed significant correlations between heterosexual behavior and female-female noncontact aggression and between female homosexual behavior and female-female contact aggression. The role of female homosexual behavior and its relationship to aggression in the formation of new groups is discussed.     

Perceptual Fluency and Judgments of Vocal Aesthetics and Stereotypicality

Research has shown that processing dynamics on the perceiver's end determine aesthetic pleasure. Specifically, typical objects, which are processed more fluently, are perceived as more attractive. We extend this notion of perceptual fluency to judgments of vocal aesthetics. Vocal attractiveness has traditionally been examined with respect to sexual dimorphism and the apparent size of a talker, as reconstructed from the acoustic signal, despite evidence that gender‐specific speech patterns are learned social behaviors. In this study, we report on a series of three experiments using 60 voices (30 females) to compare the relationship between judgments of vocal attractiveness, stereotypicality, and gender categorization fluency. Our results indicate that attractiveness and stereotypicality are highly correlated for female and male voices. Stereotypicality and categorization fluency were also correlated for male voices, but not female voices. Crucially, stereotypicality and categorization fluency interacted to predict attractiveness, suggesting the role of perceptual fluency is present, but nuanced, in judgments of human voices.     

The Promise and Pitfalls of Facebook Advertising: a Genetic Counselor’s Perspective

Facebook advertising is a powerful tool for increasing the outreach and recruitment of research participants. We describe our experience as genetic counselors within the context of an internet-based research study, recruiting subjects for a Parkinson disease (PD) biomarker study.     

A Multilevel Meta-analysis on Academic Achievement Among Maltreated Youth

Maltreatment can influence normative development and negatively impact emotional, behavioral, and social functioning in youth. As a result, it is not surprising that maltreated youth, as compared to non-maltreated youth, tend to underperform academically. Research on the academic performance of maltreated youth has increased over the last decade and several review papers have been published in this area. While the conclusions of these review articles have been that maltreated youth are at greater risk for academic deficits as compared to their non-maltreated peers, there are several conflicting findings within the literature that make it difficult to determine if or to what extent maltreated youth may demonstrate academic difficulty. Using a multilevel, structural equation model meta-analysis technique, the current study sought to provide a quantitative synthesis of the literature by examining the mean difference between maltreated and non-maltreated youth on measures of academic performance. Moreover, the current study also examined group differences between academic subject and maltreatment type. A total of 72 effect sizes were extracted from 32 studies that met inclusion criteria. Results demonstrated an overall negative, medium effect size, such that maltreated youth tended to perform slightly greater than half a standard deviation below non-maltreated youth on measures of academic performance. Moderation analyses suggest deficits may be greater on measures of general academic performance, as compared to language arts measures. No differences were observed for maltreatment type. These findings highlight the need for increased focus on academic difficulties among maltreated youth.     

A biopsychosocial approach to liver transplant evaluation in two patients with Wilson's disease

Wilson's disease (WD) is characterized by hepatic, neurological, and/or psychiatric disturbances. In some cases, liver transplantation is indicated. Because psychologists and other health care workers play an increasing role in the evaluation of individuals presenting for transplant, an understanding of the heterogeneous phenotype of WD is important for mental health professionals working in medical settings. This article reviews two cases of patients with WD (one probable, one confirmed) presenting for liver transplantation and a biopsychosocial assessment approach is demonstrated. Patients are presented in terms of medical, psychiatric, and psychosocial history, neuropsychological examination results, and the subsequent indications for liver transplantation. Both patients exhibited neurocognitive and psychiatric symptoms. One patient was determined to be a marginally suitable candidate for transplantation, whereas the other was considered at high risk for negative outcome post-transplant. This article demonstrates the importance of considering phenotypic presentation, neurocognitive function, psychiatric status, and psychosocial circumstances in assessing transplant readiness in patients with WD. A comprehensive and integrative biopsychosocial assessment approach is appropriate for evaluating patients with WD presenting for liver transplantation.     

WHEN THINKING HESITATES: PHILOSOPHY AS PROSTHESIS AND TRANSFORMATIVE VISION

In this essay, I draw on Henri Bergson and Maurice Merleau‐Ponty to interrogate what philosophy is and how it can continue to think. Though my answer is not reducible to the views of either philosopher, what joins them is an attempt to elaborate philosophy as a different way of seeing. In this light, I propose a view of philosophy as prosthesis—as a means and a way for seeing differently. Rather than a simple tool, philosophy as prosthesis is a transformative supplement, one that our bodily perception calls for and wherein that perception is recast. Rather than a fixed or assured view, this prosthesis holds open the interval in which thinking can take place. Philosophy, I argue, must wait. It sees and thinks hesitatingly, for the temporality it inscribes is not a foreseeable development but the unfolding of life as tendency, as that which creates its own possibility as it comes into existence.     

What Virtual Twins Reveal About General Intelligence and Other Behaviors

The Fullerton Virtual Twin Study has been assessing the behaviors of an unusual sibship since 1982. Virtual twins (VTs) are same-age, unrelated siblings reared together since infancy. They replicate the rearing situation of twins but without the genetic link, enabling direct assessment of shared environmental effects on behavior. An updated analysis of IQ data, based on an increased sample of 142 VT pairs (7.87 years, SD=8.22), is presented. Intraclass correlations of .28 (IQ) and .11 (subtest profile) indicated modest shared environmental influences on intelligence. Findings from the Twins, Adoptees, Peers and Siblings (TAPS) project that studies virtual twins and other kinships are described.