Culture and the Emotion Socialization of Preschoolers

Objective:The present study examined mothers’ emotion socialization of 3-year–old children with behavior problems, to determine whether emotion socialization practices, as well as the relation between these practices and child functioning, varied across ethnicities. Method: Participants were 156 preschoolers with behavior problems. Mothers were European American (n = 98), Latina American (n = 40; predominately Puerto Rican), and African American (n = 18). Audio taped mother-child interactions were coded for emotion socialization behaviors. Results: Overall, this study provided evidence for both differences and similarities across ethnicities on parental emotion socialization practices. Ethnic differences in use of emotion socialization practices were only found for mothers’ emotion focused reactions, minimizing reactions, and non-responses to negative affect. However, ethnic differences emerged in the relations between emotion socialization practices and child functioning. Several emotion socialization parental behaviors were differentially related to current child internalizing and externalizing problems across ethnic groups. Conclusions: Results provide some support for the existence of cultural differences in emotion socialization practices and their associated child outcomes

The Neural Correlates of Emotion Reactivity and Regulation in Young Children with ADHD

Attention-deficit hyperactivity disorder (ADHD) is the most frequently occurring pediatric neurobehavioral disorder. Although emotion reactivity and regulation are frequently impaired in ADHD, few studies have examined these factors in preschool aged children with ADHD, and none have explored the neural correlates of emotion reactivity and regulation in this group though event-related potentials (ERPs). Children aged 4 to 7 with (n = 24) and without (n = 30) ADHD symptoms completed an attention task composed of four blocks: baseline, frustration, suppression, and recovery. In the frustration and suppression blocks, negative affect was induced by false negative feedback. During the suppression block, children were asked to suppress emotional expressions. Children in both groups reported increased frustration from baseline to the frustration block, but the magnitude of the increase was significantly larger for children with ADHD. Both groups showed similar increases in observed expressions of negative affect from the baseline to frustration block, but children with ADHD expressed more negative affect in both blocks. In the left frontal and frontocentral regions, typically developing children demonstrated enhanced P3 amplitudes during the frustration block, suggesting that these children were able to allocate greater attentional control in the face of an emotional challenge. In contrast, children with ADHD symptoms did not show significant P3 enhancement during the frustration block. During the suppression block, children with ADHD demonstrated smaller reductions in self-report and observed expressions of negative affect compared to typically developing children. Typically developing children continued to demonstrate enhanced P3 amplitudes in frontal and frontocentral regions during the suppression block, compared to baseline, but children with ADHD did not. This pattern suggests that preschool aged children with ADHD are not as effective as their peers in suppressing emotions and engaging top down attention mechanisms. The present study extends a growing body of literature that suggests that emotion dysregulation is a central component of ADHD already present in the preschool years and underscores that emotional contexts may exacerbate attentional deficits in ADHD

SO(3) \times U(1) isometric instantons with non abelian hair in four dimensional string theory

We compute the exact effective string vacuum backgrounds of the level $k = 81/19 SU(2,1)/U(1)$ coset model. A compact SU(2) isometry present in this seven dimensional solution allows to interpreting it after compactification as a four dimensional non-abelian SU(2) charged instanton with a singular submanifold and an $SO(3) \times U(1)$ isometry. The semiclassical backgrounds, solutions of the type II strings, present similar characteristics.Comment: 12 pages, latex fil

Children\u27s learning of anxiety sensitivity : a preliminary study using a sample of youths referred for anxiety disorders

The purpose of the present study was to examine the origins of anxiety sensitivity (AS) by assessing youths\u27 learning experiences in relation to their AS symptoms and anxiety symptoms. Participants were 33 youths between 7 to 13 years old (M = 9.39 years, SD = 2.01). Youths were assessed using a structured interview and self-report measures. Chi-square analyses revealed no statistically significant differences in the proportions of boys vs. girls, Hispanic vs. non-Hispanic, and married vs. non-married. Pearson correlation analyses revealed that youths\u27 AS learning experiences were significantly related to youths\u27 AS and to youths\u27 anxiety symptoms scores. Partial correlations between youths\u27 learning experiences associated with AS symptoms in relation to AS scores controlling for anxiety symptoms effects were statistically significant. Findings were consistent with theory and suggest that learning mechanisms may be involved in AS acquisition and maintenance. The findings\u27 implications are discussed regarding possible learning experiences\u27 role in the development of AS

Exact monopole instantons and cosmological solutions in string theory from abelian dimensional reduction

We compute the exact string vacuum backgrounds corresponding to the non-compact coset theory $SU(2,1)/SU(2)$. The conformal field theory defined by the level $k= 4$ results in a five dimensional singular solution that factorizes in an asymptotic region as the linear dilaton solution and a $S^3$ model. It presents two abelian compact isometries that allow to reinterpreting it from a four dimensional point of view as a stationary and magnetically charged space-time resembling in some aspects the Kerr-Newman solution of general relativity. The $k=\frac{13}{7}$ theory on the other hand describes a cosmological solution that interpolates between a singular phase at short times and a $S^1 \times S^2$ universe after some planckian times.Comment: 18 pages, section 5 replaced by 5 and 6, references added; to appear in Phys. Rev.

Learning to hunt Crocodiles: social organization in the process of knowledge generation and the emergence of management practices among Mayan of Mexico

Background New kinds of knowledge, usage patterns and management strategies of natural resources emerge in local communities as a way of coping with uncertainty in a changing world.Studying how human groups adapt and create new livelihoods strategies are important research topics for creating policies in natural resources management. Here, we study the adoption and development of lagartos (Crocodylus moreletii) commercial hunting by Mayan people from a communal land in Quintana Roo state. Two questions guided our work: how did the Mayan learn to hunt lagartos? And how, and in what context, did knowledge and management practices emerge? We believe that social structures, knowledge and preexisting skills facilitate the hunting learning process, but lagarto ecological knowledge and organizational practice were developed in a learning by doing process. Methods We conducted free, semi-structured and in-depth interviews over 17 prestigious lagartos hunters who reconstructed the activity through oral history. Then, we analyzed the sources of information and routes of learning and investigated the role of previous knowledge and social organization in the development of this novel activity. Finally, we discussed the emergence of hunting in relation to the characteristic of natural resource and the tenure system. Results Lagarto hunting for skin selling was a short-term activity, which represented an alternative source of money for some Mayans known as lagarteros. They acquired different types of knowledge and skills through various sources of experience (individual practice, or from foreign hunters and other Mayan hunters). The developed management system involved a set of local knowledge about lagartos ecology and a social organization structure that was then articulated in the formation of ?working groups? with particular hunting locations (rumbos and trabajaderos), rotation strategies and collaboration among them. Access rules and regulations identified were in an incipient state of development and were little documented. Conclusions In agreement to the hypothesis proposed, the Mayan used multiple learning paths to develop a new activity: the lagarto hunting. On the one hand, they used their traditional social organization structure as well as their culturally inherited knowledge. On the other hand, they acquired new ecological knowledge of the species in a learning-by-doing process, together with the use of other sources of external information. The formation of working groups, the exchange of information and the administration of hunting locations are similar to other productive activities and livelihood practiced by these Mayan. Skills such as preparing skins and lagartos ecological knowledge were acquired by foreign hunters and during hunting practice, respectively. We detected a feedback between local ecological knowledge and social organization, which in turn promoted the emergence of Mayan hunting management practices.Fil: Zamudio, Fernando. Universidad Nacional de Misiones. Facultad de Ciencias Forestales. Instituto de Biologia Subtropical - Sede Puerto Iguazu; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Bello, Baltazar Eduardo. El Colegio de la Frontera del Sur; MéxicoFil: Estrada Lugo, Erin I. J.. El Colegio de la Frontera del Sur; Méxic

Miniaturizable ion-selective arrays based on highly stable polymer membranes for biomedical applications

Poly(vinylchloride) (PVC) is the most common polymer matrix used in the fabrication of ion-selective electrodes (ISEs). However, the surfaces of PVC-based sensors have been reported to show membrane instability. In an attempt to overcome this limitation, here we developed two alternative methods for the preparation of highly stable and robust ion-selective sensors. These platforms are based on the selective electropolymerization of poly(3,4-ethylenedioxythiophene) (PEDOT), where the sulfur atoms contained in the polymer covalently interact with the gold electrode, also permitting controlled selective attachment on a miniaturized electrode in an array format. This platform sensor was improved with the crosslinking of the membrane compounds with poly(ethyleneglycol) diglycidyl ether (PEG), thus also increasing the biocompatibility of the sensor. The resulting ISE membranes showed faster signal stabilization of the sensor response compared with that of the PVC matrix and also better reproducibility and stability, thus making these platforms highly suitable candidates for the manufacture of robust implantable sensors. Keywords: ion-selective electrode (ISE) sensor, pH detection, ischemia, electrochemistry, implantable device, biomedicine, endoscop

Thermal and rheological behaviour of stearate-based phase change nanofluids

A comprehensive study has been performed on the thermal and rheological behaviour of two sets of isooctyl stearate (PureTemp 8, PT8) based nanofluids with different concentrations of spherical MgO nanoparticles (up to 15 wt%) and graphene nanoplatelets (up to 2 wt%). The results show that the presence of the nanomaterials does not significantly alter the phase change temperatures of the base fluids, although the latent heat decreases by 27% and 7.6% for 15 wt% MgO and 1.0 wt% GnP-based nanofluids, respectively. Both nanomaterials are found to increase the thermal diffusivity of the nanofluids. GnP-based suspensions have a higher thermal diffusivity than the MgO ones at similar nanomaterial concentrations. Rheological analyses show that MgO-PT8 nanofluids behave as a viscoplastic material (solid at zero shear rate); whereas the GnP-PT8 samples are viscoelastic (liquid at zero shear rate). MgO nanoparticles promote the formation of large fractal agglomerates, leading to a strong gel network of particles within PT8, while platelet-shaped GnP gives a fluid-like behaviour.Agencia Estatal de Investigación | Ref. ENE2017-86425-C2-1-RAgencia Estatal de Investigación | Ref. PID2020-112846RB-C21Agencia Estatal de Investigación | Ref. PDC2021-121225-C21Agencia Estatal de Investigación | Ref. PRE2021-097589Xunta de Galicia | Ref. ED431C 2020/06Universidade de Vigo/CISU