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Search Results: 1 - 10 of 1062 matches for " Pessoa "
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Emotion and Attention Effects: Is It All a Matter of Timing? Not Yet
Luiz Pessoa
Frontiers in Human Neuroscience , 2010, DOI: 10.3389/fnhum.2010.00172
Abstract: Controversy surrounds the relationship between emotion and attention in brain and behavior. Two recent studies acquired millisecond-level data to investigate the timing of emotion and attention effects in the amygdala (Luo et al., 2010; Pourtois et al., 2010). Both studies argued that the effects of emotional content temporally precede those of attention and that prior discrepancies in the literature may stem from the temporal characteristics of the functional MRI (fMRI) signal. Although both studies provide important insights about the temporal unfolding of affective responses in the brain, several issues are discussed here that qualify their results. Accordingly, it may not be yet time to accept the conclusion that “automaticity is a matter of timing”. Indeed, emotion and attention may be more closely linked than suggested in the two studies discussed here.
Understanding brain networks and brain organization
Luiz Pessoa
Quantitative Biology , 2014, DOI: 10.1016/j.plrev.2014.03.005
Abstract: What is the relationship between brain and behavior? The answer to this question necessitates characterizing the mapping between structure and function. The aim of this paper is to discuss broad issues surrounding the link between structure and function in the brain that will motivate a network perspective to understanding this question. As others in the past, I argue that a network perspective should supplant the common strategy of understanding the brain in terms of individual regions. Whereas this perspective is needed for a fuller characterization of the mind-brain, it should not be viewed as panacea. For one, the challenges posed by the many-to-many mapping between regions and functions is not dissolved by the network perspective. Although the problem is ameliorated, one should not anticipate a one-to-one mapping when the network approach is adopted. Furthermore, decomposition of the brain network in terms of meaningful clusters of regions, such as the ones generated by community-finding algorithms, does not by itself reveal 'true' subnetworks. Given the hierarchical and multi-relational relationship between regions, multiple decompositions will offer different 'slices' of a broader landscape of networks within the brain. Finally, I described how the function of brain regions can be characterized in a multidimensional manner via the idea of diversity profiles. The concept can also be used to describe the way different brain regions participate in networks.
An Innovative Approach for Attribute Reduction in Rough Set Theory  [PDF]
Alex Sandro Aguiar Pessoa, Stephan Stephany
Intelligent Information Management (IIM) , 2014, DOI: 10.4236/iim.2014.65022
Abstract:

The Rough Sets Theory is used in data mining with emphasis on the treatment of uncertain or vague information. In the case of classification, this theory implicitly calculates reducts of the full set of attributes, eliminating those that are redundant or meaningless. Such reducts may even serve as input to other classifiers other than Rough Sets. The typical high dimensionality of current databases precludes the use of greedy methods to find optimal or suboptimal reducts in the search space and requires the use of stochastic methods. In this context, the calculation of reducts is typically performed by a genetic algorithm, but other metaheuristics have been proposed with better performance. This work proposes the innovative use of two known metaheuristics for this calculation, the Variable Neighborhood Search, the Variable Neighborhood Descent, besides a third heuristic called Decrescent Cardinality Search. The last one is a new heuristic specifically proposed for reduct calculation. Considering some databases commonly found in the literature of the area, the reducts that have been obtained present lower cardinality, i.e., a lower number of attributes.

On the Omori-Yau Maximum Principle and Geometric Applications
Barnabe Pessoa LIma,Leandro De Freitas Pessoa
Mathematics , 2012,
Abstract: We introduce a version of the Omori-Yau maximum principle which generalizes the version obtained by Pigola-Rigoli-Setti 21. We apply our method to derive a non-trivial generalization Jorge-Koutrofiotis Theorem 15 for cylindrically bounded submanifolds due to Alias-Bessa-Montenegro 2, we extend results due to Alias-Dajczer 5, Alias-Bessa-Dajczer 1 and Alias-Impera-Rigoli 6.
Brincando com o espa?o: uma proposta para as Escolas Técnicas de Saúde do SUS
Pessoa, Luisa Regina;
História, Ciências, Saúde-Manguinhos , 2003, DOI: 10.1590/S0104-59702003000200011
Abstract: the present article is a report of an experience in architectural projects for building eight new technical health schools for sus (etsus) and remodeling seven existing schools. in order to do so, profae (project for the training of nursing professionals) organized the project and building bureau, related to project component ii and composed by four architects specialized in hospital architecture. besides, it engaged the technical staff in charge of remodeling and improving etsus and other participant schools. the project was developed from september 2001 and october 2002, when preliminary studies were carried out and the projects were concluded and submitted to legal approval. the development of the projects was based on the following principles: the creation of flexible spaces to cope with transformation in health services and with professional training both in high-cost technology and in activities related to basic health assistance, the choice of architectural emphasis on energy saving, the reinforcement of etsus identity and the creation of projects that would help technical schools sustainability.
Histórias contrafactuais: o surgimento da Física Quantica
Pessoa Jr., Osvaldo;
Estudos Avan?ados , 2000, DOI: 10.1590/S0103-40142000000200013
Abstract: in this paper, one attempts to develop a method for investigating counterfactual histories of science, that is, possibles histories that did not occur. we develop a theory of science based on the notion of "advance" (ideas, data etc.), which are units passed from scientist to scientist and which would be conserved in passing from one possible history to another. advances are connected to each other by nets of causal influence, and we distinguish strong and weak influences. around sixty types of advances are grouped in ten classes. as our case study, we examine the beginning of the old quantum theory (1850-1915), using computation to store and process historical information. based only on secondary literature, we describe four great possible histories and six small paths to the appearance of this theory. as continuation of the research, we will have to examine in greater detail the history of the period, especially of experimental science, and improve the strategies for postulation of counterfactual histories.
Flora da Usina S?o José, Igarassu, Pernambuco: Orchidaceae
Pessoa, Edlley;Alves, Marccus;
Rodriguésia , 2012, DOI: 10.1590/S2175-78602012000200009
Abstract: orchidaceae was recently pointed as the most representative family in atlantic forest. based on the lack of data and the fragmentation with lost of diversity, this paper provides a checklist of the orchids in some fragments of atlantic rainforest in usina s?o josé (usj), pernambuco, brazil. the study area includes six forest fragments in igarassu, pernambuco. fieldwork was carried out from december/2008 to march/2010. the vouchers were deposited at ufp herbarium. orchidaceae is represented by 27 species and 19 genera which epidendrum l. (4 spp.) and scaphyglottis poepp. & endl.(3 spp.) were the richest in number of species. this work increases 20 spp. to that recorded for usj in previous checklist. three species are recorded here for the first time for the atlantic rainflorest, and one is a new record to northeastern brazil. cattleya granulosa lindl. and zygostates bradei (schltr.) garay are considered threatened. the piedade remain is noteworthy for having 26 spp., which is a rppn. the data shows the importance of the area to conservation of the biodiversity in the state.
Mestres de caixa e viola
Pessoa, Jadir de Morais;
Cadernos CEDES , 2007, DOI: 10.1590/S0101-32622007000100005
Abstract: this text assumes that the greatest volume of writings on popular education derives from the effort of several researchers to analyze and reflect about the practices of individual and collective subjects, aiming mainly to make subordinate groups aware of the causes of their respective poverty and lack of assistance. such writings usually also seek to overcome this condition by sending adults and youths to school and promoting actions within the popular culture, political training and community mobilizations. that, in many ways, subjects and groups construct their own forms of social cohesion, which are essentially production of meaning and knowledge, has usually not been taken into account. this happens expressively in the dances, entertainments and collective manifestations of popular religiosity. an example proposed in this text is that of the folia de reis (folly of the kings), when the agents of the ritual communicate these meanings and knowledge, even from home to home, when they visit annually the devoted inhabitants.
Abuso sexual e sociometria: um estudo dos vínculos afetivos em famílias incestuosas
Matias, Delane Pessoa;
Psicologia em Estudo , 2006, DOI: 10.1590/S1413-73722006000200008
Abstract: the study described in this article had the purpose of studying the affective bonds in families where incestuous relations occurred. two families attended by núcleo de combate à violência e explora??o sexual - da secretaria de a??o social do estado do ceará, a center of combat to violence and sexual abuse supported by the secretariat of social action of the state were studied. the victims were females, one of them 07 years old and the other 14 years old, both sexually abused by the father and stepfather, respectively. the means for data collection was a sociometric test, which studies the social structures, through choices and rejections that occur within human groups. the results show the sociometric structure of the groups, as well as, the social status occupied by the participants. the analysis of data indicated that the victims show reduction of self-esteem and perception deficits. the study concludes that, the deep knowledge of the affective bonds within incestuous families allow more efficient therapeutics interventions, in order to recover the relations, considered essential to the coexistence of the individuals in the family group.
Modelo causal dos primórdios da ciência do magnetismo
Pessoa Júnior, Osvaldo;
Scientiae Studia , 2010, DOI: 10.1590/S1678-31662010000200003
Abstract: this article presents a brief history of the beginning of the science of magnetism, which took place independently in three different continents. the methodology of causal models in the history of science is applied to represent these independent paths, where the notion of "developmental bottleneck" appears. special attention is given to the definition of "generalized advances", which encompass different species of advances and simplify the causal diagrams. the historical survey covers the advances in magnetism in china and europe until 1600.
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