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Efectos de la inhalación aguda y crónica de pegante de contacto con tolueno en el ap al de un grupo de ratones machos
No full text130 Páginas.La presente investigación busca evaluar los efectos de la inhalación aguda y crónica de pegante de contacto con tolueno "Boxer" durante 10 días, media hora, 60ppm, sobre el aprendizaje espacial de 46 ratones. Los ratones fueron divididos en dos grupos: experimental y control, se utilizó un diseño experimental de series cronológicas con repetición del estímulo. El estudio se llevó a cabo en tres fases: entrenamiento, inhalación y evaluación, midiendo en cada una de ellas tiempo de latencia, tiempo de recorrido y número de aciertos como indicadores conductuales comprobar la hipótesis de investigación. Este estudio no mostró diferencias significativas entre los grupos, por lo tanto la inhalación de pegante no afecta el aprendizaje espacial de un grupo de ratones machos
Efectos de la inhalación aguda y crónica de un pegante de contacto sobre el aprendizaje con discriminación visual en ratones hembras y macho
Get PDF103 Páginas.Se profundizó sobre los efectos de inhalación aguda y crónica de pegante de contacto con cantidad de (60 ppm) por 30 minutos, durante 20 días consecutivos, sobre el aprendizaje discriminativo en 60 ratones machos y hembras de 22 semanas de edad de la cepa ICR. El estudio se llevó a cabo en 2 momentos, una fase línea de base y una fase de inhalación, tomando como indicadores conductuales, tiempos de latencia, respuesta y frecuencia de aciertos y errores. Este estudio no mostró diferencias significativas entre el grupo experimental y control, sobre los indicadores conductuales que intentaban corroborar la hipótesis, aunque si se encontraron diferencias a nivel intra grupo durante las diferentes fases
Diferencias entre patrones de frecuencia electroencefalográfica (EEG) en adultos con alto nivel de ansiedad rasgo
No full textEl presente trabajo de grado tuvo como objetivo establecer diferencias entre los patrones de Frecuencia Electroencefalográfica (EEG) en un grupo de adultos con nivel alto de ansiedad rasgo, mediante un diseño ex post facto prospectivo simple con un método transversal, a través del desarrollo de cuatro fases. El estudio de variables, se realizó a través de dos instrumentos, el Cuestionario de Ansiedad estado-Rasgo (STAI) y el Mapeo EEG bajo tres modalidades ojos cerrados [OC], ojos abiertos [OA] y tarea [TAR]. Los resultados identificaron patrones de activación comunes en la muestra participantes tales como presencia de bajos cocientes de Theta-Beta que sugieren la predominancia de ondas rápidas en zonas parietales; presencia de picos altos Alfa en zonas frontales y centrales; sincronías de ondas Beta en áreas centrales y frontales del cerebro y asimetrías de activación entre hemisferios, mostrando hiperactivación derecha. La descripción realizada permitió identificar un estatus electroencefalográfico común en el grupo de participantes con ansiedad rasgo.The objective of this degree work was to establish differences between the Electroencephalographic Frequency (EEG) patterns in a group of adults with a high level of trait anxiety, through a simple prospective ex post facto design with a transversal method, through the development of four . phases. The study of variables was carried out through two instruments, the State-Trait Anxiety Questionnaire (STAI) and EEG Mapping under three modalities eyes closed [OC], eyes open [OA] and task [TAR]. The results identify common activation patterns in the sample of participants such as the presence of low Theta-Beta ratios that suggest the predominance of fast waves in parietal areas; presence of high Alpha peaks in frontal and central areas; Beta wave synchronies in central and frontal areas of the brain and activation asymmetries between hemispheres, showing right hyperactivation. The description made allowed us to identify a common electroencephalographic status in the group of participants with trait anxiety.PregradoPsicólog
Atividade elétrica cerebral da atenção em adolescentes policonsumidores por meio de um equipamento de Brain Control Interface (BCI)
Get PDFEl consumo de sustancias psicoactivas es un problema de salud pública que afecta cada vez más a la población adolescente. La presente investigación tuvo como objetivo registrar la actividad eléctrica cerebral (EEG) en tareas de atención (sostenida y selectiva) en un grupo de adolescentes policonsumidores. Se empleó un diseño ex post-facto retrospectivo con grupo cuasi control, en 46 adolescentes con edades entre los 12 los 17 años: 23 policonsumidores y 23 cuasi-controles. Para el registro de la actividad eléctrica cerebral se utilizó un equipo de BCI (Brain Control Interface) Emotiv EPOC research grade 14 Channel Mobile EEG y se aplicó el Programa virtual de entrenamiento cerebral Brain HQ con el módulo “enfoco mi atención” para la evaluación de la atención. Los resultados mostraron un incremento de ondas cerebrales beta-β (13-30 Hz), theta-θ (4-7 Hz) y delta-δ (3-4 Hz) en áreas frontales y prefrontales en los adolescentes policonsumidores en tareas de atención en comparación con el grupo cuasi-control. Se identificó una diferencia significativa con respecto al tiempo de respuesta entre los adolescentes consumidores de sustancias psicoactivas frente al grupo cuasi-control en ambos tipos de tareas atencionales.The consumption of psychoactive substances is a public health problem that increasingly affects the adolescent population. This investigation had the objective of record the brain electrical activity (EEG) in attention tasks (sustained and selective) in a group of polyconsumers. Employment a retrospective ex post-facto design with a quasi-control group with 46 adolescents between 12-17 years old: 23 polyconsumers and 23 quasi-controls. For the recording of brain electrical activity, it was used a equipment BCI (Brain Control Interface) research grade 14 Channel Mobile EEG and applied the Brain Training Virtual Program "Brain HQ" module “focus my attention” to evaluate the attention. The results showed an increase in beta-β (1330 Hz), theta-θ (4-7 Hz) and delta-δ (3-4 Hz) brain waves in frontal and prefrontal areas in adolescent polyonsumers versus the quasi-control group in attention tasks. Likewise, identified a significant difference with respect to the response time between adolescents consuming psychoactive substances in relation to the quasi-control group in both types of attentional tasks.O consumo de substâncias psicoativas é um problema de saúde pública que afeta cada vez mais a população adolescente. Esta pesquisa teve como objetivo registrar a atividade elétrica cerebral (EEG) em tarefas de atenção (sustentada e alternada) num grupo de adolescentes policonsumidores. Foi empregado um desenho ex post-facto retrospectivo com grupo quasecontrole, em en 46 adolescentes entre 12 e 17 anos de idade: 23 policonsumidores e 23 quase-controles. Para o registro da atividade elétrica cerebral, foi utilizado um equipamento de Brain Control Interface (BCI) Emotiv EPOC research grade 14 Channel Mobile EEG e foi aplicado o Programa Virtual de Treinamento Cerebral Brain HQ, com o módulo “foco minha atenção” para a avaliar a atenção. Os resultados mostraram um aumento de ondas cerebrais beta-β (13-30 Hz), theta-θ (4-7 Hz) e delta-δ (3-4 Hz) em áreas frontais e pré-frontais nos adolescentes policonsumidores em tarefas de atenção em comparação com o grupo quase-controle. Foi identificada uma diferença significativa a respeito do tempo de resposta entre os adolescentes consumidores de substâncias psicoativas ante o grupo quase-controle em ambos os tipos de tarefas de atenção
Efectos de la escopolamina a corto y largo plazo en la memoria y las habilidades conceptuales
No full textThe intoxication by scopolamine is the second cause of acute intoxication in Bogotá and probably in others cities of Colombia. The use of this toxic in criminal attacks represents a social and health problem of immeasurable proportions. The knowledge of its long term effects in cognitive functions as the memory and conceptual abilities is scarce. In this investigation the effects of intoxication by scopolamine were evaluated in tow different times between a group of 20 people into the 15 and 60 years old, using categorization and classification upon memory and conceptual abilities. The first evaluation was carried out five days after clinic treatments and the second evaluation was made six months later. As the exposed group and as a non exposed group was evaluated parallelly in both moments of the evaluation with the Wechsler memory test, the figure of Rey-Osterrieth test, the Classification of Cards of Wisconsin test, and the progressive matrix of WAIS III subtest. The results suggest that the intoxication by scopolamine causes deterioration in memory and conceptual abilities in short and long term.El uso de este tóxico en Colombia con fines delincuenciales representa un problema social y de salud de proporciones inmensurables, de ahí la importancia de conocer sus efectos a corto y largo plazo en la memoria y las habilidades conceptuales. Se evaluaron los efectos de la intoxicación por escopolamina sobre memoria, categorización y clasificación en 20 sujetos, entre 15 y 60 años. Se utilizó un diseño prospectivo con dos mediciones. Los sujetos fueron evaluados a los cinco días después de egresar de la clínica y a los seis meses. Los no expuestos se evaluaron paralelamente en los dos momentos de la evaluación, por medio de la prueba de memoria de Wechsler, el test de la figura de Rey-Osterrieth, el test de clasificación de tarjetas de Wisconsin y la subprueba de matrices progresivas del WAIS III. Los resultados obtenidos sugieren que la intoxicación por escopolamina provoca deterioro en la memoria y las habilidades conceptuales tanto a corto como a largo plazo
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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