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Search Results: 1 - 10 of 171897 matches for " Mariana E. Mendonca "
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Effects of Sensory Behavioral Tasks on Pain Threshold and Cortical Excitability
Magdalena Sarah Volz, Vanessa Suarez-Contreras, Mariana E. Mendonca, Fernando Santos Pinheiro, Lotfi B. Merabet, Felipe Fregni
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0052968
Abstract: Background/Objective Transcutaneous electrical stimulation has been proven to modulate nervous system activity, leading to changes in pain perception, via the peripheral sensory system, in a bottom up approach. We tested whether different sensory behavioral tasks induce significant effects in pain processing and whether these changes correlate with cortical plasticity. Methodology/Principal Findings This randomized parallel designed experiment included forty healthy right-handed males. Three different somatosensory tasks, including learning tasks with and without visual feedback and simple somatosensory input, were tested on pressure pain threshold and motor cortex excitability using transcranial magnetic stimulation (TMS). Sensory tasks induced hand-specific pain modulation effects. They increased pain thresholds of the left hand (which was the target to the sensory tasks) and decreased them in the right hand. TMS showed that somatosensory input decreased cortical excitability, as indexed by reduced MEP amplitudes and increased SICI. Although somatosensory tasks similarly altered pain thresholds and cortical excitability, there was no significant correlation between these variables and only the visual feedback task showed significant somatosensory learning. Conclusions/Significance Lack of correlation between cortical excitability and pain thresholds and lack of differential effects across tasks, but significant changes in pain thresholds suggest that analgesic effects of somatosensory tasks are not primarily associated with motor cortical neural mechanisms, thus, suggesting that subcortical neural circuits and/or spinal cord are involved with the observed effects. Identifying the neural mechanisms of somatosensory stimulation on pain may open novel possibilities for combining different targeted therapies for pain control.
Optimal Control of Finite Dimensional Quantum Systems
Paulo E. M. F. Mendonca
Physics , 2009,
Abstract: This thesis addresses the problem of developing a quantum counter-part of the well established classical theory of control. We dwell on the fundamental fact that quantum states are generally not perfectly distinguishable, and quantum measurements typically introduce noise in the system being measured. Because of these, it is generally not clear whether the central concept of the classical control theory -- that of observing the system and then applying feedback -- is always useful in the quantum setting. We center our investigations around the problem of transforming the state of a quantum system into a given target state, when the system can be prepared in different ways, and the target state depends on the choice of preparation. We call this the "quantum tracking problem" and show how it can be formulated as an optimization problem that can be approached both numerically and analytically. This problem provides a simple route to the characterization of the quantum trade-off between information gain and disturbance, and is seen to have several applications in quantum information.
Dissociation of Motor Task-Induced Cortical Excitability and Pain Perception Changes in Healthy Volunteers
Magdalena S. Volz, Mariana Mendonca, Fernando S. Pinheiro, Huashun Cui, Marcus Santana, Felipe Fregni
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0034273
Abstract: Background There is evidence that interventions aiming at modulation of the motor cortex activity lead to pain reduction. In order to understand further the role of the motor cortex on pain modulation, we aimed to compare the behavioral (pressure pain threshold) and neurophysiological effects (transcranial magnetic stimulation (TMS) induced cortical excitability) across three different motor tasks. Methodology/Principal Findings Fifteen healthy male subjects were enrolled in this randomized, controlled, blinded, cross-over designed study. Three different tasks were tested including motor learning with and without visual feedback, and simple hand movements. Cortical excitability was assessed using single and paired-pulse TMS measures such as resting motor threshold (RMT), motor-evoked potential (MEP), intracortical facilitation (ICF), short intracortical inhibition (SICI), and cortical silent period (CSP). All tasks showed significant reduction in pain perception represented by an increase in pressure pain threshold compared to the control condition (untrained hand). ANOVA indicated a difference among the three tasks regarding motor cortex excitability change. There was a significant increase in motor cortex excitability (as indexed by MEP increase and CSP shortening) for the simple hand movements. Conclusions/Significance Although different motor tasks involving motor learning with and without visual feedback and simple hand movements appear to change pain perception similarly, it is likely that the neural mechanisms might not be the same as evidenced by differential effects in motor cortex excitability induced by these tasks. In addition, TMS-indexed motor excitability measures are not likely good markers to index the effects of motor-based tasks on pain perception in healthy subjects as other neural networks besides primary motor cortex might be involved with pain modulation during motor training.
Optimal tracking for pairs of qubit states
Paulo E. M. F. Mendonca,Alexei Gilchrist,Andrew C. Doherty
Physics , 2008, DOI: 10.1103/PhysRevA.78.012319
Abstract: In classical control theory, tracking refers to the ability to perform measurements and feedback on a classical system in order to enforce some desired dynamics. In this paper we investigate a simple version of quantum tracking, namely, we look at how to optimally transform the state of a single qubit into a given target state, when the system can be prepared in two different ways, and the target state depends on the choice of preparation. We propose a tracking strategy that is proved to be optimal for any input and target states. Applications in the context of state discrimination, state purification, state stabilization and state-dependent quantum cloning are presented, where existing optimality results are recovered and extended.
A novel GNAS mutation in an infant boy with pseudohypoparathyroidism type Ia and normal serum calcium and phosphate levels
Reis, Mariana Tenorio Antunes;Cattani, Andreina;Mendonca, Berenice Bilharinho;Corrêa, Pedro Henrique Silveira;Martin, Regina Matsunaga;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2010, DOI: 10.1590/S0004-27302010000800011
Abstract: the objective of this study was to describe a new mutation in gnas in a family with pseudohypoparathyroidism type ia (php ia), a rare osteometabolic disease. an 8-month-old boy was seen by an endocrinologist due to obesity and low growth velocity. noteworthy, his mother exhibited typical albright hereditary osteodystrophy (aho) phenotype. the clinical diagnosis of php ia was suspected. the gnas coding region from mother and son was amplified and directly sequenced. a novel heterozygous missense mutation (c.673t>c) was identified in exon 5 in both patients. in this family, the mother's clinical picture was the clue for the son's diagnosis. molecular analysis of gnas confirmed the diagnosis of php ia in both patients and the child's early diagnosis was possible. moreover, this novel missense substitution expands the spectrum of gnas mutations associated with this disorder and allows for genetic counseling of this family.
Nuevos datos, viejas colecciones: los conjuntos óseos de Cerro Casa de Piedra Cueva 5 (Parque Nacional Perito Moreno, Santa Cruz)
De Nigris,Mariana E.;
Intersecciones en antropolog?-a , 2007,
Abstract: this paper presents the results of a new analysis of bone collections from cerro casa de piedra cueva 5. the archaeological site is a large cave positioned on the north side of a volcanic hill located on the southern bank of roble river (900 masl) in a transitional area between the forest and the shrubby patagonian steppe within the perito moreno national park, northwest of santa cruz, argentina. the occupational sequence is formed by four stratigraphic layers radiocarbon dated between ca. 2500 and 6500 years bp. bone samples had been recovered during the 1980s but have received no attention since. the main aim of this paper is to identify continuities and changes in faunal resource consumption to better understand hunter-gatherer strategies during the middle and late holocene. the analyzed assemblages show several similarities. guanaco (lama guanicoe) is always the main food resource, although huemul (hippocamelus bisulcus) is also important. the appendicular skeleton predominates for both ungulates, and there is a great diversity of processing marks compatible with consumption events. despite these similarities, the assemblages also show variations in prey exploitation through time.
Pierre Bourdieu y el hecho social religioso: Análisis de su obra y apropiaciones desde el trabajo histórico y etnográfico
Espinosa,Mariana E.;
Trabajo y sociedad , 2010,
Abstract: this article reflects to the texts of pierre bourdieu that take under study the social fact religious. we propose thinking about the possibilities of an analysis sociological and anthropological which the notions bourdieuanas enables for the study of different worlds empirical, other than those concerning the field catholic we find in their texts of sociology of religion recently published in spanish (2009). i pretend do this task in two analysis. first, i report to three texts about sociology of religion of bourdieu. ([1971] 2009; [1971] 1991; [1975] 1985). here examine how bourdieu adds to the discussions of the classic sociology and the linguistic saussureiana an analysis relational and disposicional. it is noted in the three texts the co-existence of a concern epistemological and a sociological search in this regard. in the second part, through two empirical research (historical and anthropological) we analyze two modes of retention fecund of pierre bourdieu’ proposal, we leave to one side the limits and scope of his notions for we will approach to the proposal of the french sociologist.
Pierre Bourdieu y el hecho social religioso: Análisis de su obra y apropiaciones desde el trabajo histórico y etnográfico Pierre Bourdieu and the social fact religious: Analysis about his work and appropriation since historical and ethnographic work
Mariana E. Espinosa
Trabajo y sociedad , 2010,
Abstract: En este artículo reflexionamos sobre los textos de Pierre Bourdieu que toman por objeto de análisis el hecho social religioso. Proponemos pensar en las posibilidades de un análisis sociológico y antropológico al que las nociones bourdieuanas nos habilita para el estudio de diversos mundos empíricos, distintos a los referentes del campo católico que encontramos claramente en sus textos de sociología de la religión de reciente publicación en lengua espa ola (2009). Esta tarea pretendo llevarla en la sucesión de dos análisis. Primero me referiré a tres textos de sociología de la religión de Bourdieu ([1971] 2009; [1971] 1991; [1975] 1985). Aquí analizo cómo el autor. incorpora a las discusiones de la sociología clásica y la lingüística saussuriana un análisis relacional y disposicional, se observa en los tres textos la co-existencia de una preocupación epistemológica y una búsqueda sociológica en tal sentido. En la segunda parte, mediante dos investigaciones empíricas (histórica y antropológica) analizamos dos modos de retención fecunda de la propuesta de Bourdieu, dejamos aun lado la lista de límites y alcances de sus nociones para acercarnos como investigadores, no al "uso del concepto", sino a la propuesta del sociólogo francés. This article reflects to the texts of Pierre Bourdieu that take under study the social fact religious. We propose thinking about the possibilities of an analysis sociological and anthropological which the notions bourdieuanas enables for the study of different worlds empirical, other than those concerning the field catholic we find in their texts of sociology of religion recently published in Spanish (2009). I pretend do this task in two analysis. First, I report to three texts about sociology of religion of Bourdieu. ([1971] 2009; [1971] 1991; [1975] 1985). Here examine how Bourdieu adds to the discussions of the classic sociology and the linguistic saussureiana an analysis relational and disposicional. It is noted in the three texts the co-existence of a concern epistemological and a sociological search in this regard. In the second part, through two empirical research (historical and anthropological) we analyze two modes of retention fecund of Pierre Bourdieu’ proposal, we leave to one side the limits and scope of his notions for we will approach to the proposal of the french sociologist.
Jessica E. Blanco. 2008. Modernidad conservadora y cultura política. La Acción Católica Argentina (1931-1941).
Mariana E. Funkner.
Revista de Estudios Sociales , 2011,
Abstract:
Nuevos datos, viejas colecciones: los conjuntos óseos de Cerro Casa de Piedra Cueva 5 (Parque Nacional Perito Moreno, Santa Cruz) New data, old collections: Cerro Casa de Piedra 5 bone assemblages (Perito Moreno National Park, Santa Cruz Province, Argentina)
Mariana E. De Nigris
Intersecciones en Antropología , 2007,
Abstract: En este trabajo se presentan los resultados de un nuevo análisis de las colecciones óseas de Cerro Casa de Piedra Cueva 5, emplazado en el Parque Nacional Perito Moreno, provincia de Santa Cruz. Las muestras óseas fueron recuperadas en excavaciones sistemáticas realizadas en la década del ′80 y se ubican temporalmente en el Holoceno medio y tardío (ca. 2500-6500 a os). El principal objetivo de este estudio es identificar las posibles variaciones existentes en el aprovechamiento de los recursos faunísticos con el fin de alcanzar un mayor entendimiento de las estrategias que implementaron las sociedades cazadoras recolectoras en torno a la utilización de los recursos de origen animal. Los resultados se alan al guanaco (Lama guanicoe) como la especie dominante si bien el huemul (Hippocamelus bisulcus) forma parte importante de la dieta. En ambos ungulados se observa un predominio del esqueleto apendicular por sobre el axial y una gran diversidad de marcas de procesamiento compatibles con situaciones de consumo. Sin embargo, a pesar de estas regularidades se han registrado también diferencias en el aprovechamiento de las presas a través del tiempo. This paper presents the results of a new analysis of bone collections from Cerro Casa de Piedra Cueva 5. The archaeological site is a large cave positioned on the north side of a volcanic hill located on the southern bank of Roble river (900 masl) in a transitional area between the forest and the shrubby Patagonian steppe within the Perito Moreno National Park, northwest of Santa Cruz, Argentina. The occupational sequence is formed by four stratigraphic layers radiocarbon dated between ca. 2500 and 6500 years BP. Bone samples had been recovered during the 1980s but have received no attention since. The main aim of this paper is to identify continuities and changes in faunal resource consumption to better understand hunter-gatherer strategies during the Middle and Late Holocene. The analyzed assemblages show several similarities. Guanaco (Lama guanicoe) is always the main food resource, although huemul (Hippocamelus bisulcus) is also important. The appendicular skeleton predominates for both ungulates, and there is a great diversity of processing marks compatible with consumption events. Despite these similarities, the assemblages also show variations in prey exploitation through time.
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