Active Brownian Particles. From Individual to Collective Stochastic Dynamics

We review theoretical models of individual motility as well as collective dynamics and pattern formation of active particles. We focus on simple models of active dynamics with a particular emphasis on nonlinear and stochastic dynamics of such self-propelled entities in the framework of statistical mechanics. Examples of such active units in complex physico-chemical and biological systems are chemically powered nano-rods, localized patterns in reaction-diffusion system, motile cells or macroscopic animals. Based on the description of individual motion of point-like active particles by stochastic differential equations, we discuss different velocity-dependent friction functions, the impact of various types of fluctuations and calculate characteristic observables such as stationary velocity distributions or diffusion coefficients. Finally, we consider not only the free and confined individual active dynamics but also different types of interaction between active particles. The resulting collective dynamical behavior of large assemblies and aggregates of active units is discussed and an overview over some recent results on spatiotemporal pattern formation in such systems is given.Comment: 161 pages, Review, Eur Phys J Special-Topics, accepte

Emotion dysregulation, ODD and Conduct Problems in a sample of five and six-year old children

Previous studies examining the relationship between emotion dysregulation and externalizing behavior problems have, so far, focused on using general screening questionnaires capturing a wide range of externalizing behaviors and emotion dysregulation has mostly been assessed through direct observation using negative mood induction and behavioral tasks. The purpose of this study was to explore this relationship using a multi-informant rated clinical questionnaires. Parents and teachers of 609 5–6-year-old children (46% girls, 54% boys) completed the ERC, DBRS, and SDQ. ODD symptoms/conduct problems and lability/negativity were more severe among boys but girls had better emotion regulation. The results also showed a significant main effect for emotion dysregulation and ODD symptoms/conduct problems and that gender had no moderating effect on the relationship. These findings show a strong association between emotion dysregulation and concurrent ODD symptoms/conduct problems and suggest that emotional difficulties should be considered when exploring causes of behavior difficulties in daily life

Emotion dysregulation, ODD and Conduct Problems in a sample of five and six-year old children

Previous studies examining the relationship between emotion dysregulation and externalizing behavior problems have, so far, focused on using general screening questionnaires capturing a wide range of externalizing behaviors and emotion dysregulation has mostly been assessed through direct observation using negative mood induction and behavioral tasks. The purpose of this study was to explore this relationship using a multi-informant rated clinical questionnaires. Parents and teachers of 609 5–6-year-old children (46% girls, 54% boys) completed the ERC, DBRS, and SDQ. ODD symptoms/conduct problems and lability/negativity were more severe among boys but girls had better emotion regulation. The results also showed a significant main effect for emotion dysregulation and ODD symptoms/conduct problems and that gender had no moderating effect on the relationship. These findings show a strong association between emotion dysregulation and concurrent ODD symptoms/conduct problems and suggest that emotional difficulties should be considered when exploring causes of behavior difficulties in daily life

Development and validation of a multicultural Spanish-language version of the Muscularity-Oriented Eating Test (MOET) in Argentina

The utility of traditional eating disorder measures in the assessment of muscularity-oriented disordered eating has been questioned. To address this limitation, the Muscularity-Oriented Eating Test (MOET) was recently developed and validated in a sample of U.S. college men. We aimed to develop a multicultural Spanish-language version of the MOET for use in Latin American samples and validate its use in a sample of Argentinian college men. Combined translation procedures were used to develop a version suitable for different Spanish-speaking populations. A total of 235 students (Mage = 23.47, SD = 5.61) participated in this study by completing a survey including the MOET. A sub-sample (n = 121) completed the MOET again after 1 week. A confirmatory factor analysis of a re-specified model of the original single-factor MOET, allowing for residual correlation between items associated to dietary rules (items 4-12), resulted in an adequate fit (χ2/df = 2.10, CFI = 0.94, TLI = 0.93, RMSEA 0.05 [90% CI = 0.04, 0.06] SRMR = 0.08). Further, the multicultural Spanish-language version of the MOET yielded evidence of internal consistency (omega = 0.83, 95% CI [0.79, 0.88], Cronbach's α = 0.83), a 1-week Intraclass Correlation Coefficient was considered for test-retest reliability (ICC = 0.82), item analysis, convergent validity with measures of eating disorder psychopathology, body dissatisfaction and weight-related behaviors, as well as for divergent validity with an unrelated construct. The availability of a multicultural Spanish-language version of the MOET may have utility in both clinical and research efforts related to muscularity-oriented disordered eating among Latino men