Browsing by Subject "RECUPERACION DE INFORMACION"
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tesis de maestría.listelement.badge Categorización automática de documentos con mapas auto-organizados de Kohonen(2007) Goldenberg, Daniel; Merlino, Hernán; Fernández, Enrique"La categorización de documentos es la tarea de separar documentos en grupos. En una época como la actual en que la obtención de información adecuada y en tiempos mínimos se hace indispensable en cualquier área de negocios, es importante mejorar la técnica de categorización de modo que los resultados obtenidos al buscar documentos sean satisfactorios tanto por la calidad del mismo como por el tiempo de respuesta. En el presente trabajo de tesis se presenta un buscador de documentos de texto por palabra clave que devuelve los resultados categorizados, utilizando para esto un mapa autoorganizado de Kohonen."artículo de publicación periódica.listelement.badge Differential neurophysiological correlates of retrieval of consolidated and reconsolidated memories in humans: an ERP and pupillometry study(2020-10) Campos-Arteaga, G.; Forcato, Cecilia; Wainstein, G.; Lagos, R.; Palacios-García, I.; Artigas, C.; Morales, R.; Pedreira, María Eugenia; Rodríguez, E."Consolidated memories can return to a labile state if they are reactivated by unpredictable reminders. To persist, active memories must be re-stabilized through a process known as reconsolidation. Although there is consistent behavioral evidence about this process in humans, the retrieval process of reconsolidated memories remains poorly understood. In this context, one fundamental question is whether the same or different neurophysiological mechanisms are involved in retrieval of consolidated and reconsolidated memories. Because it has been demonstrated that the exposure to the reconsolidation process may restructure and strengthen memories, we hypothesized distinct neurophysiological patterns during retrieval of reconsolidated memories. In addition, we hypothesized that interfering with the reconsolidation process using a new learning can prevent these neurophysiological changes. To test it, consolidated, reconsolidated and declarative memories whose reconsolidation process was interfered (i.e., picture-word pairs) were evaluated in humans in an old/new associative recall task while the brain activity and the pupillary response were recorded using electroencephalography and eyetracking. Our results showed that retrieval of reconsolidated memories elicits specific patterns of brain activation, characterized by an earlier peak latency and a smaller magnitude of the left parietal ERP old/new effect compared to memories that were only consolidated or whose reconsolidation process was interfered by a new learning. Moreover, our results demonstrated that only retrieval of reconsolidated memories is associated with a late reversed mid-frontal effect in a 600–690 time window. Complementarily, memories that were reactivated showed an earlier peak latency of the pupil old/new effect compared to non-reactivated memories. These findings support the idea that reconsolidation has an important impact in how memories are retrieved in the future, showing that retrieval of reconsolidated memories is partially supported by specific brain mechanisms."póster.listelement.badge The impact of time, age and frequency of use on recognizing personal items of our closest ones: Forensic implications. Preliminary results(2021) Bonilla, Matías; Vidal, Vanesa; León, Candela S.; Urreta Benítez, Facundo A.; Forcato, Cecilia"Sometimes people have to recognize belongings of close ones that were found in places where, for example, genocides took place. This is done in order to pinpoint a missing person's last whereabouts and in some cases because the family asks to keep with their belongings. To do this, one part of the process is asking the relatives of the missing person to identify the items. However, in some cases (e.g. the missing people during the last Argentine military dictatorship) these procedures have been put in doubt by the legal system in order to prevent errors such as two or more families recognizing the same item as their own and thus to prevent nonsense re-exposure to traumatic memories. To the best of our knowledge, there is a lack of studies evaluating our performance on recognition of clothes from close ones. It is known that our capacity to correctly recognize items depends on various factors, such as age, frequency of item exposure, level of stress, sleep, among others [1-4]. Here, we will discuss preliminary data of how different factors such as time, age and frequency of use modulate the capacity to correctly and falsely recognize personal items of close ones. These results can enlighten and help the everyday practice of organizations such asthe “Argentine Team of Forensic Anthropology” (EAAF) to make decisions about the reliability of the clothing recognition by the victim’s relatives."artículo de publicación periódica.listelement.badge Memory reconsolidation as a tool to endure encoding deficits in elderly(2020-08) Tassone, Leonela M.; Urreta Benítez, Facundo A.; Rochon, Delfina; Martínez, Paula B.; Bonilla, Matías; León, Candela S.; Muchnik, Carolina; Solis, Patricia; Medel, Nancy; Kochen, Silvia; Brusco, Luis Ignacio; Moyano, Malen D.; Forcato, Cecilia"Normal aging involves changes in the ability to acquire, consolidate and recall new information. It has been recently proposed that the reconsolidation process is also affected in older adults. Reconsolidation is triggered after reminder presentation, allowing memories to be modified: they can be impaired, strengthened or changed in their content. In young adults it was previously shown that the presentation of repetitive reminders induces memory strengthening one day after reactivation and the presentation of at least one reminder increases memory persistence several days after reactivation. However, until now this process has remained elusive in older adults. We hypothesize that older adults need a stronger reminder to induce memory strengthening through the reconsolidation process than young adults. To test this, we perform a three-day experiment. On day 1, participants learned 15 sound-word associations, on day 2 they received no reminders (NR group), one reminder (R group) or two rounds of reactivations (Rx2 group). Finally, they were tested on day 7. We found that, contrary to our hypothesis, older adults show a memory improvement triggered by repeated labilization/reconsolidation processes to an equal extent than young adults. These results open new perspectives into the use of reconsolidation to improve daily acquired information and the development of therapeutic home used tools to produce memory enhancement in healthy older adults or those with cognitive decline."proyecto final de grado.listelement.badge Minería de opinión para la voz del consumidor(2010) Stocca, Juan Pablo; Galíndez, María del Carmen"Este trabajo pretende capturar la voz del consumidor dentro del mercado de celulares "smartphone" de Estados Unidos. Su objeto de estudio es el Droid Incredible, un producto de HTC. Por otro lado, se comparará el rendimiento de este producto con alguno de sus principales competidores: iPhone 4 de Apple, Droid X de Motorola y Bold 9700 de Blackberry. La innovación que presenta esta tesis es el uso de la Minería de Opinión para lograr los resultados. La Minería de Opinión es una aplicación específica de la Minería de Texto, un proceso que permite obtener información de alto valor a partir de texto desestructurado basado en el lenguaje natural. La información de texto que se usará como entrada al análisis será información pública de la Web, extraída a través de la técnica de Web Scraping. Con el uso de estas herramientas se encontrarán los principales problemas que el consumidor enfrenta cuando usa el producto siendo las más importantes la poca vida útil de la batería y un sistema de comunicación errático. Por otro lado, se hará un análisis especial sobre la velocidad de respuesta del teléfono, un atributo valorado en la competencia y con no tan buenos resultados en el Droid Incredible. En el trabajo se explicará como el estudio de la voz del consumidor es una etapa clave en el mejoramiento de la calidad de los productos. La información proporcionada permitirá a la organización tomar acciones para corregir sus problemas, pues el método planteado corresponde a un proceso real de mejoramiento de la calidad".