Poco sabemos del impacto de muchas sustancias químicas artificiales en nuestro suelo. Existen más de 100.000 diferentes, y aunque muchas se han prohibido por peligrosas, sabemos que ya se encuentran en suelos a los que han llegado, la mayoría de las veces, por vertidos no controlados.

Este artículo analiza Aventuras sigilosas (1945), poemario de José Lezama Lima, a través del concepto de deseo como principio estructural y dinámico en el proceso de transformación al que es sometido el sujeto protagónico; en dicho tránsito, la compleja red de imágenes en sucesión, con distintos valores simbólicos en los poemas, tiene una función central. Para estudiar este fenómeno, se retoman tres composiciones: “Llamado del deseoso”, “El fuego por la aldea” y “El guardián inicia el combate circular”, pues constituyen puntos (...) nodales en el itinerario de transformaciones que articula este poemario. Tras el análisis textual, se señala la naturaleza heterogénea e integral del deseo no sólo como principio propio de la esfera sexual, sino como una voluntad dinámica de cambio, vinculada con imágenes naturales y míticas como el fuego. Palabras clave: deseo, imagen, transformación, fuego, poesía. (shrink)

Resumen: Este artículo tiene como foco de estudio la fonología segmental del mapudungun, en general, y el estatus de los fonos interdentales /en el chedungun hablado en Alto Biobío, en particular. Se elicitó una lista léxica adaptada de Croese, 30 colaboradores adultos, bilingües de chedungun y español, pertenecientes a 10 localidades pehuenches de esta comuna. Mediante evidencia cuantitativa, visual, palatográfica y de contraste en ambiente análogo, se concluye que dichos fonos tienen estatus fonémico en la zona señalada.: This article focuses (...) on the Mapudungún segmental phonology in general, and the status of the interdental phones / from the Chedungun spoken in Alto Biobío in particular. An adapted lexicon list by Croese was elicited from 30 adult bilingual assistants, belonging to 10 towns of this community. Through the quantitative, visual, palatographic and analog environment contrast we concluded that those phones have phonemic status in the mentioned area. (shrink)

ResumenLa investigación social cualitativa ha prescindido de la utilización de referentes empíricos accesibles y compartidos a partir de los cuales acordar la producción y el análisis del habla. A partir de este criticable déficit, lo que hace este trabajo es analizar el problema del habla utilizada como material empírico para observación desde el punto de vista de la labor científica. Con esta finalidad se argumenta la importancia de la comunicabilidad de las observaciones producidas y de su análisis a partir de (...) los problemas que plantea la función deíctica del habla observada en la investigación. La conclusión del trabajo plantea la necesidad acordar e introducir un referente objetual en la situación de observación experimental con el fin de garantizar la comunicabilidad de las acciones investigadoras, así como la recepción y circulación del habla observada entre las distintas comunidades de hablantes y sistemas discursivos.Palabras clave: discurso social; validez; investigación cualitativa; función deíctica; comunicación. (shrink)

A partir del análisis e interpretación de diversos textos fundacionales sobre el grupo de discusión y su concepción en el ámbito español y latinoamericano, se critica la idea reduccionista de entender esta técnica como una forma más abierta y menos directiva del genérico focusgroup anglosajón. Dicha confusión es analizada con el fin de establecer las relaciones existentes entre ambas técnicas y las posibles diferencias que las distingue y opone entre sí. El resultado del análisis lleva a concebir al grupo de (...) discusión cómo una técnica necesitada del focusgoup y, a la vez, establecer en dicha necesidad un motivo para indagar en la parte sustantiva de la dinámica grupal que caracteriza a esta técnica.This articleanalyses the tendency to understand the technique of discussiongroup asa less directivefocus group. This simplifying idea is confusing and is criticized with the objective to know the motives that hold together both techniques. The analysis established the dependent relationship between discussiongroup and focus group, as well as finding in this dependence the reason to understand the discussiongroup as a group dynamics totally different to the focus group. (shrink)

The impact of digital devices and the Internet has generated various changes at social, political, and economic levels, the repercussion of which is a great challenge characterized by the changing and globalized nature of today's society. This demands the development of new skills and new learning models in relation to information and communication technologies. Universities must respond to these social demands in the training of their future professionals. This paper aims to analyze the empirical evidence provided by international studies in (...) the last eleven years, related to the digital literacy of university students, including those pursuing degrees related to the field of education. Our findings highlight the fact that the digital literacy that is offered in universities to graduate/postgraduate students, in addition to treating digital literacy as a central theme, also focuses on perceived and developed self-efficacy. This is done by strengthening competencies related to digital writing and reading, the use of databases, the digital design of content and materials, and the skills to edit, publish or share them on the web, or applications aimed at treating digital literacy as emerging pedagogies and educational innovation. Secondly, we found studies related to digital competencies and use of the Internet, social networks, web 2.0, or the treatment of digital risks and their relationship with digital literacy. Thirdly, we found works that, in addition to focusing on digital literacy, also focused on different psychological constructs such as motivation, commitment, attitudes, or satisfaction.Systematic review registration:https://www.scopus.com/home.uri; https://www.recursoscientificos.fecyt.es/. (shrink)

The Creative Citizenship project was founded to promote critical, ethical, and creative thinking in early childhood, and to recognize and encourage children as social actors and peacebuilders. In concert with the methodology of North American philosopher Matthew Lipman's Philosophy for Children (P4C), Creative Citizenship seeks to promote in children the ability to think critically, ethically, and creatively in and from their own realities, and to exercise multidimensional thinking skills in the various areas of their daily lives. The research documented here (...) adopted a qualitative approach in so far as it sought to inquire about the character of those relationships, particularly among boys and girls, that promote their identity as social agents. As such, it examined training processes and generated theoretical perspectives in the interest of promoting social transformation through the empowerment of multidimensional thinking. The article begins with a review of the concept of Creative Citizenship and ends with that of Peacebuilding. Three theoretical categories have been applied in order to situate the inquiry within the framework of the realities of childhood, and to chart the pedagogical interventions by adults that occurred throughout the implementation of the project. The first focuses on the development of children’s thinking per se, the second on children's capacities for creative problem-solving in social environments, and the third on the concept of peacebuilding as a commitment to practicing philosophical dialogue among children, which is understood as a form of discourse that builds the capacities of citizens to undertake individual and collective actions that allow them, in turn, to create and re-create scenarios of peaceful coexistence. (shrink)

In line with recent efforts to empirically study the folk concept of weakness of will, we examine two issues in this paper: (1) How is weakness of will attribution [WWA] influenced by an agent’s violations of best judgment and/or resolution, and by the moral valence of the agent’s action? (2) Do any of these influences depend on the cognitive dispositions of the judging individual? We implemented a factorial 2x2x2 between–subjects design with judgment violation, resolution violation, and action valence as independent (...) variables, and measured participants’ cognitive dispositions using Frederick’s Cognitive Reflection Test [CRT]. We conclude that intuitive and reflective individuals have two different concepts of weakness of will. The study supports this claim by showing that: a) the WWA of intuitive subjects is influenced by the action’s (and probably also the commitment’s) moral valence, while the WWA of reflective subjects is not; b) judgment violation plays a small role in the WWA of intuitive subjects, while reflective subjects treat resolution violation as the only relevant trait. Data were collected among students at two different universities. All subjects (N=710) answered the CRT. A three-way ANOVA was first conducted on the whole sample and then on the intuitive and reflective groups separately. This study suggests that differences in cognitive dispositions can significantly impact the folk understanding of philosophical concepts, and thus suggests that analysis of folk concepts should take cognitive dispositions into account. (shrink)

Background No studies have been conducted in Mexico to ascertain what ethical problems doctors working at hospitals deal with. This article aims to describe the ethical conflicts most commonly identified by Mexican internists and the importance they attribute to each of these conflicts. Methods Voluntary survey to the members of the Internal Medicine Association of Mexico. Results Responses were submitted by 347 internists. Half of those face ethical conflicts almost always or frequently. The most commonplace and relevant conflicts are those (...) resulting from the clinical relationship (communication, confidentiality, informed consent, assessment of mental capacity, decisions involving incapacitated patients, and conflicts with family members), and secondly those problems related with the end of life (palliative care, withholding or withdrawing treatment, and “No CPR orders”). To resolve conflicts they seek support through protocols, Institutional Ethics Committees (IECs), and consultations with colleagues and, occasionally, with bioethics experts. Protocols and IECs are the tools most in demand among them. Conclusions 1) the most frequent and relevant conflicts are those caused by the clinical relationship, above all those due to doctor–patient communication, and secondly those due to problems which arise at the end of life; 2) though nearly all of them have doubts about how to resolve conflicts, the vast majority are satisfied with the way in which they do so; 3) to deal with conflicts, they seek support mainly in protocols, IECs, and consultation with colleagues; and 4) in order to resolve them better, what they most demand are protocols and IECs, but also bioethics consultants. (shrink)

Resumen Este artículo se ocupa del estatus fonético-fonológico de las consonantes interdentales, en el Mapudungun hablado en el sector costa de isla Huapi, IX Región de La Araucanía. Después del análisis de pares mínimos, cuantificación de los segmentos interdentales versus alveolares, y la consciencia fonológica de los hablantes encuestados, se pudo concluir la vigencia de estos segmentos en tanto fonos y en tanto fonemas. Es decir, en esta zona son fonemas.This article deals with the phonetic-phonological status of the interdental consonants (...) ],, in the Mapudungun spoken in the Coastal area of the Huapi Island, IX Region of Araucania. After analyzing minimal pairs, quantification of interdental segments versus alveolar, and the phonological awareness of the assessed speakers, the validity of these segments could be concluded both as phones and as phonemes. That is to say,, are phonemes in this area. (shrink)

In this research, a sliding mode regulator with sine mapping is suggested for the stabilization of electricity generators being affected by magnet interaction nonlinearities and generator nonlinearities. To reach this goal, our suggested regulator has the following contributions: it starts from the sliding mode regulator with the modifications that the saturation mapping is used to reach a smoother performance instead of the signum mapping, and the sine mapping is applied to reach an upper bound in the proportional gain error, it (...) is used to reach some chosen constant behaviors for the angle position, angle speed, and current in the electricity generators, and its stabilization is ensured based on the Lyapunov approach. We show the simulation of the suggested regulator in two electricity generators. (shrink)

Esta obra nos ofrece una reflexión de calado en relación al proceso de formación del profesorado, a partir del fenómeno educativo entendido como un hecho político, desde una praxis profesional crítica y reflexiva sobre una base conceptualmente sólida, que favorezca el surgimiento de un sujeto personal y colectivo auto-determinado. Hecho formativo que, profundizando en las bases educativas, analiza la autora con gran rigor científico desde la teoría y la política educativa, en una síntesis int..

Adaptive optics are techniques used for processing the spatial resolution of astronomical images taken from large ground-based telescopes. In this work, computational results are presented for a modified curvature sensor, the tomographic pupil image wavefront sensor, which measures the turbulence of the atmosphere, expressed in terms of an expansion over Zernike polynomials. Convolutional neural networks are presented as an alternative to the TPI-WFS reconstruction. This technique is a machine learning model of the family of artificial neural networks, which are widely (...) known for its performance as modeling and prediction technique in complex systems. Results obtained from the reconstruction of the networks are compared with the TPI-WFS reconstruction by estimating errors and optical measurements. The reconstructed wavefronts from both techniques are compared for wavefronts of 153 Zernike modes. For this case, a detailed comparison and grid search to find the most suitable neural network is performed, searching between multi-layer perceptron, CNN and recurrent networks topologies. In general, the best network was a CNN trained for TPI-WFS reconstruction, achieving better performance than the reconstruction software from TPI-WFS in most of the turbulent profiles, but the most significant improvements were found for higher turbulent profiles that have the lowest r0 values. (shrink)

La filosofía de G.W.F. Hegel en el período temprano de Frankfurt se vincula a la idea de unidad, totalidad de la vida, en relación con la naturaleza. Hölderlin coincidirá con su Hyperion en esta idea de exaltación de la vida, que se encuentra en el manuscrito de Hegel de 1800 poco antes de abandonar Frankfurt. El amor es desarrollado como conciliación entre los amantes que sin suprimir las diferencias une lo separado, pero la vida es “sentimiento” y no cabe aquí (...) la reflexión del entendimiento. Hegel analiza el amor, en relación a la presencia e identidad, la unidad y los hijos y la propiedad. De modo particular en el texto de Jena del System Sittlichkeit, Hegel pasa a analizar la intersubjetividad desde la violencia. La posibilidad de admitir tanto el valor como la pasividad que se abandona al destino. Aunque la conciencia de sí, considera Hegel cabe en el reconocimiento de las autoconciencias de los esposos establecidas por la conciliación del amor (donde analiza el pudor). Con todo entiende que no cabe reflexión sobre la vida si no es en la violencia mediante la exposición de la vida a la muerte. Es otro concepto diferente a la vida como principio y proceso (werden) de otro modo diferente a la elaboración de aquella unidad orgánica del todo de Frankfurt en el que cabían las multiplicidades integradas en la vida orgánica y pensará (Jena) que “el único señor es la muerte”. Pero tematiza, también “el alma bella” que identifica con Jesús y asocia al amor puro y al destino. (shrink)

Edición a cargo de José Luis Tasset & Francisco Vázquez García. Introducción de José Luis Tasset. Epílogo de Francisco Vázquez García.

El texto es una reseña sobre el libro "El clown existencial. Historia de una poética sobre la condición humana", de Carlos Gutiérrez Bracho.

Este artículo tiene por objetivo analizar la relación y la recepción que cuatro filósofos de la generación de la democracia: Tomás Pollán, Javier Sádaba, Manuel Fraijó y Jesús Mosterín han mantenido y realizado respectivamente, con y sobre, el pensamiento español contemporáneo que les antecedió.

Book reviewed in this article: In Search of History: Historiography in the Ancient World and the Origins of Biblical History. By John Van Seters. The Hidden God: The Hiding of the Face of God in the Old Testament. By Samuel E. Balentine. Theodicy in the Old Testament. Edited by James L. Crenshaw. Ce Dieu censé aimer la Souffrance. By François Varone. Evil and Evolution, A Theodicy. By Richard W. Kropf. ‘Poet and Peasant’ and ‘Through Peasant Eyes’: A Literary‐Cultural Approach to (...) the Parable in Luke. By Kenneth Bailey. The Biblical Foundations for Mission. By Donald Senior and Carroll Stuhlmueller. New Testament Foundations of Ministry. By Colin Kruse. Church, Ministry and Unity. By James E. Griffiss. Theology of Ministry. By Thomas Franklin O'Meara. Yesterday and Today: A Study of Continuities in Christology. By Colin E. Gunton. I believe in the Holy Spirit. By Yves Congar. Between Jesus and Paul. By Martin Hengel. From Nicaea to Chalcedon: A Guide to the Literature and its Background. By Frances Young. Alan of Lille: The Frontiers of Theology in the Later Twelfth Century. By G.R. Evans. Mystic and Pilgrim: The Book and the World of Margery Kempe. By Clarissa W. Atkinson. Church, Politics and Society: Scotland 1408–1929. Edited by N. Macdougall. Renaissance and Reform: The Italian Contribution. Collected Essays, Volume II. By Frances A. Yates. Seven‐Headed Luther: Essays in Commemoration of a Quincentury, 1483–1983. Edited by Peter Newman Brooks. Ökumenische Erschliessung Martin Luthers. Edited by Peter Manns and Harding Meyer. Luther's Ecumenical Significance, An Interconfessional Consultation. Edited by Peter Manns and Harding Meyer, in collaboration with Carter Lindberg and Harry McSorley. States of Mind: A Study of Anglo‐Irish Conflict 1780 to 1980. By Oliver MacDonagh. The Parish Clergy in Nineteenth‐Century Russia: Crisis, Reform, Counter Reform. By Gregory L. Freeze. Pusey Rediscovered. Edited by Perry Butler. Between Two Worlds: George Tyrrell's Relationship to the Thought of Matthew Arnold. By Nicholas Sagovsky. The Concept of Glaubenslehre. By Walter E. Wyman, Jr. The Existence and Nature of God. Edited by Alfred J. Freddoso. Faith and Reason. By Anthony Kenny. Logic and The Nature of God. By Stephen T. Davis. Personal Responsibility and Christian Morality. By Josef Fuchs. Morality and Conflict. By Stuart Hampshire. Realism and Imagination in Ethics. By Sabina Lovibond. Intentionality. By John R. Searle. Philosophical Papers, I: Practical Reason. By G.H. von Wright. Philosophical Papers, II: Philosophical Logic. By G.H. von Wright. A Model of Making: Literary Criticism and its Theology. By Ruth Etchells. The Return of the Goddess: Femininity, Aggression and the Modern Grail Quest. By Edward Whitmont. The Power of the Poor in History. By Gustavo Gutierrez, translated by Robert R. Barr. The God of the Xhosa. By Janet Hodgson. Our Hymn Tunes: Their Choice and Performance. By Donald Webster. The Almighty Wall: The Architecture of Henry Vaughan. By William Morgan. An Introduction to Plato's Laws. By R.E. Stalley. Plato's Late Ontology: A Riddle Resolved. By Kenneth M. Sayre. Plato's ‘Parmenides’: Translation and Analysis. By R.E. Allen. Politics in the Ancient World. By M.I. Finley. (shrink)

In the past decade, significant social movements emerged in South Africa, in response to specific urban challenges of injustice or exclusion. This article will interrogate the meaning of such urban social movements for theological education and the church. Departing from a firm conviction that such movements are irruptions of the poor, in the way described by Gustavo Gutierrez and others, and that movements of liberation residing with, or in a commitment to, the poor, should be the locus of our theological (...) reflection, this article suggests that there is much to be gained from the praxis of urban social movements, in disrupting, informing and shaping the praxis of both theological education and the church. I will give special consideration to Ndifuna Ukwazi and the Reclaim the City campaign in Cape Town, the Social Justice Coalition in Cape Town, and Abahlali baseMjondolo based in Durban, considering these as some of the most important and exciting examples of liberatory praxes in South Africa today. I argue that theological education and educators, and a church committed to the Jesus who came ‘to liberate the oppressed’, ignore these irruptions of the Spirit at our own peril. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Overcoming Greed:Buddhists and Christians in Consumerist SocietyPaul F. KnitterAs I understand my assignment, I don't find it an easy one. I've been instructed to carry on a lopsided dialogue. Generally, what generates productive dialogue is a proper balance of learning and questioning. My assigned job in this exchange is to question more than learn—to offer some Christian queries about how Buddhists think we can overcome greed and find a (...) path out of the consumerist jungle that surrounds us. Actually, I'd prefer it the other way around, for I'm convinced that we Christians have some very important, if not absolutely vital, things to learn from Buddhists in our own efforts to deal with the jungle. And I will mention some of them. But, following instructions, my main focus in what follows will be on areas where I suspect that Buddhists can learn something, maybe something very helpful, in our shared efforts to deal with greed and the havoc it is working on people and planet.I need to specify my Christian voice in this conversation—or, as they say, where I'm coming from within the many and diverse neighborhoods that make up the Christian community. I'll be reflecting and speaking out of my knowledge of and experience with Christian liberation theology, especially as it has been born, developed, and taken new shapes among the poor and suffering of Latin America. The voices and concerns you will hear in my own remarks are originally those of Christian thinkers and activists such as Jon Sobrino, Gustavo Gutiérrez, Leonardo Boff.In order to bring some order into the swarm of insights and questions that these extremely rich presentations have stirred up in me, I'll gather my comments around two broad topics.The Inner and the Outer: Enlightenment and the Reign of GodMy first general area of conversation is a familiar one not just for the Buddhist-Christian conversation but also for all activists who call themselves religious: the need for, but the difficulty of, holding together the "inner and the outer"—action and [End Page 65] contemplation, personal and social transformation, or what I will term Buddha's enlightenment and Jesus' vision of the Reign of God.What Christian Liberation Theologians Need to Hear from BuddhistsFirst, let me simply list, and hold back from delving into, some crucial lessons that we Christians not only can but drastically need to learn.First, what Jesus and his followers call the Reign of God will be built on sand unless it is grounded in the personal, inner conversion of those who are trying to build it. The church will be only a empty building—or worse, a den of thieves—if its members, and that includes its leaders, are not transformed by the Spirit. Or, in Judith Simmer-Brown's words, "No fundamental transformation can take place anywhere without the joining of inner change and outer change" (emphasis mine). Or, in Ken Barnhill's words (quoted by Brown), "Social work entails inner work.... social change and inner change are inseparable." Or, in the powerful and widely quoted admonition of Thich Nhat Hanh: We have to be peace if we want to make peace. Christians know this, and they talk about it. But in my own life and in what I see in my church, how often we forget it in our efforts to get things done, in our concern for the institution, in our determination to bring about political change.Second, I both cringed and nodded approvingly when I read about Judith Simmer-Brown speaking about "idiot compassion." In opposing wealthy landowners in El Salvador, or in a business-controlled city council in Cincinnati, how often I have felt but perhaps not identified in myself and in my fellow Christian activists "...unskillful acts...the impulsive response based on insufficient knowledge [that] can quickly become ineffective, causing personal burnout." Such idiocy, grounded in goodwill, derives, again, from an insufficient balancing of the inner and the outer.Third, and more sharply focused on the suffering caused by greed, Judith offers a hope, or deep belief, that is often not clearly present among liberation theologians since... (shrink)

This book seeks to arrive at a better understanding of the relationships between the objective and subjective aspects of time. It discusses the existence of fluent time, a controversial concept in many areas, from philosophy to physics. Fluent time is understood as directional time with a past, a present and a future. We experience fluent time in our lives and we adopt a temporal perspective in our ways of knowing and acting. Nevertheless, the existence of fluent time has been debated (...) for both philosophical and scientific reasons, thus creating a rift between the subjective and objective aspects of time. Starting from the basic notion of points of view, or perspectives, this book explores the relationships between objective or external time, as it has been conceptualized by science, and subjective or internal time, which is involved in our lived experiences. It establishes a general framework encompassing the nature, structure and mode of existence of points of view, in which the objective and subjective aspects of time can be integrated. The book mainly addresses researchers and postgraduates in philosophy and logic. Additionally, it offers inspiration for physicists and computer scientists involved in the modeling and simulation of complex behaviors for which the representation of internal time should be considered together with the notion of objective, external time. (shrink)

In this work, a new intelligent control strategy based on neural networks is proposed to cope with some external disturbances that can affect quadrotor unmanned aerial vehicles dynamics. Specifically, the variation of the system mass during logistic tasks and the influence of the wind are considered. An adaptive neuromass estimator and an adaptive neural disturbance estimator complement the action of a set of PID controllers, stabilizing the UAV and improving the system performance. The control strategy has been extensively tested with (...) different trajectories: linear, helical, circular, and even a lemniscate one. During the experiments, the mass of the UAV is triplicated and winds of 6 and 9 in Beaufort’s scale are introduced. Simulation results show how the online learning of the estimator increases the robustness of the controller, reducing the effects of the changes in the mass and of the wind on the quadrotor. (shrink)

O presente artigo traz à baila uma reflexão teórico-narrativa acerca daquela que tem sido chamada «Espiritualidade Martirial». A conceituação sobre espiritualidade e martírio deu-se por meio de pesquisa exploratório-bibliográfica. A discussão central foi tecida em diálogo, sobretudo, com os estudos teológicos de Casaldáliga, Sobrino e Gutierrez. As conclusões apontam no sentido de que a Espiritualidade Martirial não está relacionada ao desejo de ser mártir. Tampouco o martírio relaciona-se à concepção de sacrifício cruento como redentor de pecado. A Espiritualidade Martirial diz (...) respeito à fidelidade ao Evangelho do perseguido e mártir, Jesus de Nazaré. De igual modo, diz respeito à fidelidade à realidade histórica atual e concreta na qual o cristão deve anunciar boas notícias aos pobres e denunciar a injustiça estrutural. Por fim, diz respeito à memória da morte dos inocentes e à fileira dos seguidores de Jesus que foram martirizados. (shrink)

A current issue in psycholinguistic research is whether the language difficulties exhibited by children with developmental language disorder [DLD, previously labeled specific language impairment ] are due to deficits in their abilities to pick up patterns in the sensory environment, an ability known as statistical learning, and the extent to which explicit learning mechanisms can be used to compensate for those deficits. Studies designed to test the compensatory role of explicit learning mechanisms in children with DLD are, however, scarce, and (...) the few conducted so far have led to inconsistent results. This work aimed to provide new insights into the role that explicit learning mechanisms might play on implicit learning deficits in children with DLD by resorting to a new approach. This approach involved not only the collection of event-related potentials, while preschool children with DLD [relative to typical language developmental controls] were exposed to a continuous auditory stream made of the repetition of three-syllable nonsense words but, importantly, the collection of ERPs when the same children performed analogous versions of the same auditory SL task first under incidental and afterward under intentional conditions. In each of these tasks, the level of predictability of the three-syllable nonsense words embedded in the speech streams was also manipulated to mimic natural languages closely. At the end of both tasks’ exposure phase, children performed a two-alternative forced-choice task from which behavioral evidence of SL was obtained. Results from the 2-AFC tasks failed to show reliable signs of SL in both groups of children. The ERPs data showed, however, significant modulations in the N100 and N400 components, taken as neural signatures of word segmentation in the brain, even though a detailed analysis of the neural responses revealed that only children from the TLD group seem to have taken advantage of the previous knowledge to enhance SL functioning. These results suggest that children with DLD showed deficits both in implicit and explicit learning mechanisms, casting doubts on the efficiency of the interventions relying on explicit instructions to help children with DLD to overcome their language difficulties. (shrink)

From an early age, exposure to a spoken language has allowed us to implicitly capture the structure underlying the succession of speech sounds in that language and to segment it into meaningful units. Statistical learning, the ability to pick up patterns in the sensory environment without intention or reinforcement, is thus assumed to play a central role in the acquisition of the rule-governed aspects of language, including the discovery of word boundaries in the continuous acoustic stream. Although extensive evidence has (...) been gathered from artificial languages experiments showing that children and adults are able to track the regularities embedded in the auditory input, as the probability of one syllable to follow another syllable in the speech stream, the developmental trajectory of this ability remains controversial. In this work, we have collected Event-Related Potentials while 5-year-old children and young adults were exposed to a speech stream made of the repetition of eight three-syllable nonsense words presenting different levels of predictability to mimic closely what occurs in natural languages and to get new insights into the changes that the mechanisms underlying auditory statistical learning might undergo through the development. The participants performed the aSL task first under implicit and, subsequently, under explicit conditions to further analyze if children take advantage of previous knowledge of the to-be-learned regularities to enhance SL, as observed with the adult participants. These findings would also contribute to extend our knowledge of the mechanisms available to assist SL at each developmental stage. Although behavioral signs of learning, even under explicit conditions, were only observed for the adult participants, ERP data showed evidence of online segmentation in the brain in both groups, as indexed by modulations in the N100 and N400 components. A detailed analysis of the neural data suggests, however, that adults and children rely on different mechanisms to assist the extraction of word-like units from the continuous speech stream, hence supporting the view that SL with auditory linguistic materials changes through development. (shrink)