The BlackBerry project: capturing the content of adolescents' text messaging

This article presents an innovative method for capturing the content of adolescents' electronic communication on handheld devices: text messaging, e-mail, and instant messaging. In an ongoing longitudinal study, adolescents were provided with BlackBerry devices with service plans paid for by the investigators, and use of text messaging was examined when participants were 15 years old and in the 10th grade (N = 175; 81 girls). BlackBerries were configured so that the content of all text messages, e-mail messages, and instant messages was saved to a secure server and organized in a highly secure, searchable, online archive. This article describes the technology used to devise this method and ethical considerations. Evidence for validity is presented, including both information on use of text messaging to show that participants used these devices heavily and frequencies of profane and sexual language in a 2-day sample of text messaging to demonstrate that they were communicating openly.     

Condition-dependent adaptive phenotypic plasticity and interspecific gene-culture coevolution

Evolutionary socioecological theory and research proposing linking parasites with human social organization is uncommon and therefore welcome. However, more generally, condition-dependent adaptive phenotypic plasticity requires environmental uncertainty on a small scale, accompanied by reliable cues. In addition, genes in parasites may select among biologically adaptive cultural alternatives directly without necessarily going through human genetic predispositions, resulting in inter-specific gene-culture coevolution.     

The Latent Structure of the Center for Epidemiological Studies-Depression Scale

Taxometric analyses were used to assess the latent structure of depressive symptoms as measured by the Center for Epidemiological Studies Depression (CES-D) scale. Participants were 3,395 college students enrolled in Introductory Psychology classes at a mid-size university. Analyses included data simulation strategies to assure that the data was appropriate for interpreting skewed indicators and small putative taxa. Four indicators (depressed mood, positive affect, somatic, and interpersonal symptoms) were derived from principal components analysis. Taxometric analyses indicated that distributions of the four CES-D factor based indicators were dimensional. Results are consistent with a continuity model of the latent structure of questionnaire measures of depressive symptoms in this young adult population, of which approximately 15% scored above the clinical cut-point for the CES-D scale.     

The reliability and validity of the Perceived Stigmatization Questionnaire (PSQ) and the Social Comfort Questionnaire (SCQ) among an adult burn survivor sample

In this study, 361 adult burn survivors completed the Perceived Stigmatization Questionnaire (PSQ), the Social Comfort Questionnaire (SCQ), and other measures. Both the PSQ and SCQ had good internal consistency indices. Factor analysis of the PSQ yielded 3 factors (absence of friendly behavior, confused/staring behavior, and hostile behavior). The SCQ had 1 factor. Conjoint factor analysis with measures of related constructs (body esteem, body-esteem importance, depression, social support) suggested that PSQ and SCQ measure distinct constructs. Correlations with the related psychosocial constructs and burn characteristics suggested the PSQ and SCQ have good convergent and discriminant validity. Limitations of the study are discussed.     

Appetitive instrumental learning is impaired by inhibition of cAMP-dependent protein kinase within the nucleus accumbens.

The medium spiny neurons of the nucleus accumbens receive a unique convergence of dopaminergic and glutamatergic inputs from regions associated with motivational, cognitive, and sensory processes. Long-term forms of plasticity in the nucleus accumbens associated with such processes as appetitive learning and drug addiction may require coactivation of both dopamine D1 and glutamate N-methyl-D-aspartate (NMDA) receptors. This notion implies that an intracellular mechanism is likely to be involved in these long-term neuroadaptive processes. The present series of experiments examined the effects of intra-accumbens microinfusion of protein kinase inhibitors on acquisition of an instrumental task, lever-pressing for food. Male Sprague-Dawley rats were bilaterally implanted with chronic indwelling cannulae aimed at the nucleus accumbens core. Following recovery, animals were food-restricted and subsequently trained for operant responding. The broad-based serine/threonine kinase inhibitor H-7 (5 or 27 nmol per side) dose-dependently impaired learning when infused immediately after testing on days 1-4. Rp-cAMPS, a cAMP-dependent protein kinase (PKA) inhibitor, also impaired learning regardless of whether it was infused immediately before (5 or 20 nmol) or immediately after (10 nmol) testing on days 1-4. Rp-cAMPS (10 nmol) also inhibited learning when infused 1 h after testing, though to a lesser extent than when administered before or immediately after testing. The PKA stimulator Sp-cAMPS (5 or 20 nmol) also impaired learning when infused before testing, suggesting that there is an optimal level of PKA activity required for learning. None of the drugs used produced nonspecific motor or feeding effects. These results provide evidence supporting the involvement of nucleus accumbens PKA in appetitive learning and suggest that this kinase may be involved in long-term changes associated with this and other motivationally based neuroadaptive processes.     

Activity Level and Sex-Stereotyped Toy Choice in Toddler Boys and Girls

In the first study, the motor activity level and vigor of play of 52 toddlers was assessed as they played with a set of sex-role stereotyped and neutral toys. Boys and girls showed the same level of activity, and both were significantly more active when playing with stereotypically masculine toys. In the second study, 27 toddlers were observed playing with toys defined as potentially eliciting high, medium, or low activity within the masculine, feminine, and neutral categories. Again, boys and girls did not differ in overall activity level. All children preferred toys that allowed moderate to high activity, but given this preference, they selected toys stereotyped for their own gender above those stereotyped for the other gender.     

On mean‐sigma estimators and bias

When two test forms measure the same construct but are independently modelled using item response theory, the two forms’ respective metrics cannot be assumed to be equivalent. Thus, before comparing parameter estimates across forms, a linear transformation must be applied to at least one form's scale. The mean‐sigma method is a well‐known procedure for estimating this adjustment when a common set of items appears on both forms. In this paper, I show both analytically and empirically (through a small simulation study) that the mean‐sigma estimators of the transformation constants are biased. While this systematic error was modest relative to random error under the conditions studied here, it is nevertheless intrinsic and its magnitude is conditional on extrinsic design features that include the number of anchor items and the quality of their difficulty estimates.     

Putting Social Psychology into Serious Games

Video or computer gaming is quickly becoming a significant part of many people's lives. We review several emerging themes in both the social psychological literature and popular culture that show the potential for a productive integration of social psychology and video gaming. In particular, we examine the growing impact of serious games and outline some social psychological principles that could be implemented in the context of games for social cognitive training.