Quantifying the effects of the differential outcomes procedure in humans: A systematic review and a meta‐analysis

We present a systematic review and a meta‐analysis comparing the differential outcomes procedure to a nondifferential outcomes procedure among clinical and nonclinical populations. Sixty distinct experiments were included in the systematic review, 43 of which were included in the meta‐analysis. We calculated pooled effect sizes for accuracy (overall accuracy, test accuracy, transfer accuracy) and acquisition outcomes (latency, errors, and trials to mastery). The meta‐analysis revealed significant medium‐to‐large effect sizes for all three accuracy measures (pooled effect size range, 0.57 to 1.30). We found relatively greater effect sizes among clinical populations (effect size = 1.04). The single‐subject experimental literature included in the systematic review was consistent with the findings from the group studies, demonstrating improvements in accuracy and speed of learning for the majority of participants. Moderator and subgroup analyses suggest that discrimination difficulty may induce relatively larger differential outcomes effects. The results indicate that the differential outcomes procedure can be a valuable addition to reinforcement‐based interventions.     

The Small Worlds and Floyd's algorithms: a way to study scientific collaboration

Many proposals from the analysis of social networks focused on the study of scientific collaboration have been made recently. The Small Worlds theory seems to be the most efficient to study the inner features of the scientific community. Those researches have demonstrated that small communities are based on some key individuals who connect some groups which, on the contrary, would be disconnected. One of the disadvantages from the perspective of the analysis of networks is the lack of researches of particular nodes. With the implementation of a pseudocode algorithm of Floyd, we try to avoid this. To study how a small community is formed and, as a research of one case, we observe the invisible college which is formed when connecting the fifteen most productive authors of the Journal of Personality and Social Psychology .     

Further examination of measurement properties of Spanish version of the Sexual Desire Inventory with undergraduates and adolescent students

The factor structure and construct validity of a Spanish version of Spector, Carey, and Steinberg's Sexual Desire Inventory was examined with structural equation modelling and a nonclinical sample (N = 608). Confirmatory factor analysis indicated that Dyadic and Solitary sexual desire scales measured two factorially distinct constructs. Their internal consistency reliabilities were .87 and .88, respectively. Structural equation analysis indicated that both subscales are distinguishable from similarly conceptualized correlates of sexual desire: the Impersonal subscale of the Sex Fantasy Questionnaire and the Erotophilia measure of the Sexual Opinion Survey. However, the data raised some questions about an empirical distinction between dyadic sexual desire and intimate sexual fantasy.     

Estudio experimental de la actitud como conducta no verbal

Resumen

Se realizó una observación controlada de las conductas motoras y pautas posturales de individuos en una situación experimental desagradable (paradigma de Milgram modificado) e individuos en una situación neutra (grupo de control). Los resultados muestran diferencias entre ambos grupos tanto en posturas como en pautas motoras. Se indica el interés de este tipo de conductas para enriquecer la acepción de actitud como conducta motora y la relación de ese concepto con los adaptadores de Ekman y Friesen.     

Prevalence and differentiating aspects related to gender with regard to the bullying phenomenon in poor countries

There is a large body of scientific knowledge about school violence and bullying in Europe and some other regions of the so-called developed world. However, improvement is scarce in poor and developing regions, as in the case of Latin America and, in particular, Nicaragua. The goal of this work was to determine the prevalence of the bullying phenomenon in Nicaraguan primary schools, to analyze the eventual relationships between the different forms of violence used by the students and to explore, in relation to these aspects, the similarities and differences between boys and girls. For this purpose, we surveyed 3042 pupils of primary school (50.3% girls) using the "Cuestionario sobre Convivencia, Violencia y Experiencias de Riesgo" (COVER, in English, Questionnaire about Living Together, Violence and Risk Experiences). We found that the level of involvement in bullying is significantly higher than in developed countries, that boys are more involved than girls in verbal, physical and psychological bullying, and that there are no differences with regard to social exclusion. The results are discussed, comparing them with studies conducted in different countries but with similar methodologies.