Análisis comparativo de la conducta de niños autistas,deficientes y normales en una situación de interacción

Resumen

El presente articulo expone una investigación cuyo objetivo es estudiar comparativamente la conducta de los niños autistas, deficientes no autistas y normales, en una situación de interacción diádica con un adulto. La muestra estaba compuesta por 30 niños, 10 en cada grupo. Los niños de los distintos grupos diagnósticos estaban igualados uno a uno en edad mental y sexo. Los deficientes y los autistas fueron igualados además en edad cronológica. Cada sujeto fue grabado mediante video en una sesión de interacción social. La conducta de los sujetos se codificó atendiendo a 34 categorías de observación que recogían distintos tipos de conducta (conductas proxémicas, de atención, expresivas, instrumentales, estrategias de comunicación, conductas de huida, agresivas…). Se discuten tos resultados y sus implicaciones, sugiriendo nuevas lineas de investigación.     

Sexual abuse history among adult sex offenders and non-sex offenders: A meta-analysis

ObjectiveThe sexually abused–sexual abuser hypothesis states there is a specific relationship between sexual abuse history and sexual offending, such that individuals who experience sexual abuse are significantly more likely to later engage in sexual offenses. Therefore, samples of adult sex offenders should contain a disproportionate number of individuals who have experienced sexual abuse, but not necessarily other types of abuse, compared with samples of other types of offenders.MethodsWe compared rates of sexual and other forms of abuse reported in 17 studies, involving 1,037 sex offenders and 1,762 non-sex offenders. We also examined the prevalence of different forms of abuse in 15 studies that compared adult sex offenders against adults (n = 962) and against children (n = 1,334), to determine if the sexually abused–sexual abuser association is even more specific to individuals who sexually offend against children.ResultsWe observed a higher prevalence of sexual abuse history among adult sex offenders than among non-sex offenders (Odds Ratio = 3.36, 95% confidence intervals of 2.23–4.82). The two groups did not significantly differ with regard to physical abuse history (OR = 1.50, 95% CI = 0.88–2.56). There was a significantly lower prevalence of sexual abuse history among sex offenders against adults compared to sex offenders against children (OR = 0.51, 95% CI = 0.35–0.74), whereas the opposite was found for physical abuse (OR = 1.43, 95% CI = 1.02–2.02).ConclusionThere is support for the sexually abused–sexual abuser hypothesis, in that sex offenders are more likely to have been sexually abused than non-sex offenders, but not more likely to have been physically abused. We discuss potential mechanisms for the relationship between sexual abuse history and sexual offending, including the possibility that a third factor might account for the relationship.Practice implicationsThe most obvious implications of these findings is that the prevention of sexual abuse of children, either through prevention programs directly targeting children or through treatment programs targeting individuals who are likely to sexually offend against children (e.g., known sex offenders against extra-familial boys), may eventually reduce the number of sex offenders. This implication is dependent, however, on a causal role of childhood sexual abuse, and on the effectiveness of prevention and treatment practices.     

High-throughput sorting of drops in microfluidic chips using electric capacitance

We analyze a recently introduced approach for the sorting of aqueous drops with biological content immersed in oil, using a microfluidic chip that combines the functionality of electrowetting with the high throughput of two-phase flow microfluidics. In this electrostatic sorter, three co-planar electrodes covered by a thin dielectric layer are placed directly below the fluidic channel. Switching the potential of the central electrode creates an electrical guide that leads the drop to the desired outlet. The generated force, which deflects the drop, can be tuned via the voltage. The working principle is based on a contrast in conductivity between the drop and the continuous phase, which ensures successful operation even for drops of highly conductive biological media like phosphate buffered saline. Moreover, since the electric field does not penetrate the drop, its content is protected from electrical currents and Joule heating. A simple capacitive model allows quantitative prediction of the electrostatic forces exerted on drops. The maximum achievable sorting rate is determined by a competition between electrostatic and hydrodynamic forces. Sorting speeds up to 1200 per second are demonstrated for conductive drops of 160 pl in low viscosity oil.