An ERP study of low and high relevance semantic features

It is believed that the N400 elicited by concepts belonging to Living is larger than N400 to Non-living. This is considered as evidence that concepts are organized, in the brain, on the basis of categories. We conducted a feature-verification experiment where Living and Non-living concepts were matched for relevance of semantic features. Relevance is a measure of the contribution of semantic features to the “core” meaning of a concept. We found that when relevance is low the N400 is large. In addition, we found that when the two categories of Living and Non-living are equated for relevance the seemingly category effect at behavioral and neural level disappeared. In sum, N400 is sensitive, rather than to categories, to semantic features, thus showing that previously reported effects of semantic categories may arise as a consequence of the differing relevance of concepts belonging to Living and Non-living categories

FEATURE TYPE EFFECTS IN SEMANTIC MEMORY: AN EVENT RELATED POTENTIALS STUDY

It is believed that the N400 elicited by concepts belonging to Living is larger than N400 to Objects. This is considered as evidence that concepts are organized, in the brain, on the basis of categories. Similarly, differential N400 to sensory and non-sensory semantic features was taken as evidence for a neural organisation of conceptual memory based on semantic features. We conducted a feature-verification experiment where Living and Non-Living concepts are described by sensory and non-sensory features were matched for age-of-acquisition, typicality and familiarity and for relevance of semantic features. Relevance is a measure of the contribution of semantic features to the “core” meaning of a concept. We found that when Relevance is low then N400 is larger. In addition, we found that when the two categories of Living and Non-Living concepts are matched for relevance the seemingly category effect at the neural level disappeared. Also no difference between sensory and non-sensory descriptions was detected when relevance was matched. In sum, N400 does not differ between categories or feature types. Previously reported effects of semantic categories and feature type may have arisen as a consequence of the differing Relevance of concepts belonging to Living and Non-Living categories

Resiting genre : a study of contemporary Italian travel writing in English translation

This thesis aims to highlight the presence of a large and varied production of contemporary Italian travel writing and to analyse the reasons for its 'invisibility' in the Italian literary system and critical tradition. Through the use of a comparative approach to genre and of current theories developed in the area of Translation Studies, the thesis will outline the different status attributed to travel writing in the Anglo-American and the Italian literary systems. Such a comparative approach allows the study to escape the narrow confines of a perspective based on the idea of national literature and to adopt a wider view, which, in turn, highlights the presence of phenomena otherwise easily overlooked or discarded as insignificant. The peculiar characteristics of travel writing, a genre mostly based on the representation of the Other for a home audience, are also analysed in order to point out their affinity with translation practices and, ultimately, to underline the 'double translation' implied by translated travel writing. The case studies which make up the remaining part of the thesis are intended to illustrate different aspects of the genre of travel writing; to provide scope for an analysis of its boundaries and connections with other genres (ranging from ethnography to autobiography, from journalism to fiction, from the essay to the novel); and to illustrate the way in which generic expectations influence both the selection of texts for translation and the strategies adopted when translating and marketing them for a new audience. The writings of twentieth-century Italian explorers to Tibet, and their translations into English, constitute a significant case of adaptation of foreign texts to the needs and expectations of a British audience (and to the British interests in the geographical area concerned). The works of Oriana Fallaci and their different reception in Italy with respect to the UK and the USA illustrate the way in which personal biography and generic choices can intersect, determining both the popular image and the critical success of an author and of her work. Calvino's choice to sublimate the genre of travel writing in the stylized fiction of Le citta invisibili is treated as an example of the way in which a text which is meant to provide an escape from a low-status genre can become an icon of that same genre once it is translated and read in a different cultural context. Finally, the case of Claudio Magris's Danubio and of its English-language translation provides evidence of the complex network of literary references which marks the reception of a text in different cultures, and of the way in which generic affiliation can both promote the recognition of a 'marginal' text and constrain its more idiosyncratic (and original) characteristics

Avaliação da condição de " tão bom quanto novo": uma aplicação envolvendo a manutenção de motores convencionais das aeronaves Universal T-5"

After a usual preventive maintenance routine it is usually assumed that a system returns to the condition of As Good As New" (AGAN). This work uses some statistical tools to propose a methodology able to test if a system returns to the Condition of AGAN and, in the cases in which the supposition cannot be validated, to determine a coefficient reliable tomeasure the system degradation. A real example related to the Universal aircraft of the Brazilian Air Force illustrates the proposed methodology. The data set considers information from 43 aircrafts. From the data set and the determination of the degradation coefficient it is possible to define Intervals Between Maintenances (TBO's) variables with the number of maintenances that the system has been submitted to, as well as, taking a series of practical conclusions for optimization of the maintenance routines.Keywords: Bootstrap, Maintenance, Time Between Overhaul (TBO), Maximum Likelihood Estimator. etc.Após uma rotina de manutenção preventiva costuma-se assumir que determinado sistema volta à condição de Tão Bom Quanto Novo(AGAN). Este trabalho utiliza algumas ferramentas estatísticas para propor uma metodologia capaz de testar se um sistema volta àCondição de AGAN e, nos casos em que a suposição de retorno não puder ser feita, determinar um coeficiente capaz de medir a degradação do sistema. Um exemplo real, relacionado à aeronave Universal da Força Aérea Brasileira, é analisado neste trabalho. O conjunto de dados envolve informações de 43 aeronaves. A partir dos dados e da determinação do coeficiente de degradação é possível definir Intervalos entre Manutenções (TBOs) variáveis de acordo com número de manutenções que o sistema já sofreu, assim como tirar uma série de conclusões práticas para otimização das rotinas de manutenção.Palavras chaves: Bootstrap, Manutenção, Tempo Entre Manutenção, Estimador de Máxima Verossimilhança

Differences in social decision-making between proposers and responders during the ultimatum game: an eeg study

The Ultimatum Game (UG) is a typical paradigm to investigate social decision-making. Although the behavior of humans in this task is already well established, the underlying brain processes remain poorly understood. Previous investigations using event-related potentials (ERPs) revealed three major components related to cognitive processes in participants engaged in the responder condition, the early ERP component P2, the feedback-related negativity (FRN) and a late positive wave (late positive component, LPC). However, the comparison of the ERP waveforms between the responder and proposer conditions has never been studied. Therefore, to investigate condition-related electrophysiological changes, we applied the UG paradigm and compared parameters of the P2, LPC and FRN components in twenty healthy participants. For the responder condition, we found a significantly decreased amplitude and delayed latency for the P2 component, whereas the mean amplitudes of the LPC and FRN increased compared to the proposer condition. Additionally, the proposer condition elicited an early component consisting of a negative deflection around 190 ms, in the upward slope of the P2, probably as a result of early conflict-related processing. Using independent component analysis (ICA), we extracted one functional component time-locked to this deflection, and with source reconstruction (LAURA) we found the anterior cingulate cortex (ACC) as one of the underlying sources. Overall, our findings indicate that intensity and time-course of neuronal systems engaged in the decision-making processes diverge between both UG conditions, suggesting differential cognitive processes. Understanding the electrophysiological bases of decision-making and social interactions in controls could be useful to further detect which steps are impaired in psychiatric patients in their ability to attribute mental states (such as beliefs, intents, or desires) to oneself and others. This ability is called mentalizing (also known as theory of mind)

Influence of Audiovisual Training on Horizontal Sound Localization and Its Related ERP Response

The objective was to investigate the influence of audiovisual training on horizontal sound localization and the underlying neurological mechanisms using a combination of psychoacoustic and electrophysiological (i.e., event-related potential, ERP) measurements on sound localization. Audiovisual stimuli were used in the training group, whilst the control group was trained using auditory stimuli only. Training sessions were undertaken once per day for three consecutive days. Sound localization accuracy was evaluated daily after training, using psychoacoustic tests. ERP responses were measured on the first and last day of tasks. Sound localization was significantly improved in the audiovisual training group when compared to the control group. Moreover, a significantly greater reduction in front-back confusion ratio for both trained and untrained angles was found between pre- and post-test in the audiovisual training group. ERP measurement showed a decrease in N1 amplitude and an increase in P2 amplitude in both groups. However, changes in late components were only found in the audiovisual training group, with an increase in P400 amplitude and decrease in N500 amplitude. These results suggest that the interactive effect of audiovisual localization training is likely to be mediated at a relatively late cognitive processing stage

Flutuação populacional de mosca-dos-chifres tratadas e não-tratadas com inseticidas em Cassilândia-MS

Este estudo foi realizado utilizando populações de Haematobia irritans provenientes de duas propriedades rurais (A e B) do município de Cassilândia-MS. Os animais nelores (grupo racial I) e mestiços (grupo racial II) foram submetidos a diferentes manejos (somente a propriedade A realizou controle da mosca-dos-chifres) e analisou-se a flutuação populacional deste inseto. De abril/2005 até junho/2006 foram avaliados quinzenalmente, pela manhã 10 vacas com 3 a 5 anos de idade de cada raça nessas propriedades. A maior população de H. irritans observada na propriedade A para o rebanho nelore ocorreu em dezembro de 2005 (69,2 m/a) enquanto o pico populacional no rebanho mestiço nessa propriedade foi pico foi observado no mês de janeiro de 2006 (154,9 m/a). No rebanho B os picos populacionais da moscas-dos-chifres ocorreram para ambos os grupos raciais no mesmo período, abril de 2005, o nelore com média de 89 m/a enquanto para os mestiços observa-se média de 140 m/a. Este levantamento demonstrou que o grupo mestiço foi mais susceptível que o nelore e que nos períodos de temperaturas elevadas e alta pluviosidade observou-se os maiores picos populacionais do referido inseto no período de estud

Time Course of the Neural Activity Related to Behavioral Decision-Making as Revealed by Event-Related Potentials

Objective: To study the time course of the electrocortical activity evoked by gains and losses in the Iowa Gambling Task (IGT), the brain sources of this electrical activity, and its association with behavioral parameters of task performance in order to achieve a better knowledge of decision-making processes. Method: Event-related potentials (ERPs) were obtained from a 64-channel EEG in 25 participants when performing the IGT. Brain source localization analyses of the ERP components were also assessed. Results: ERP amplitudes were sensitive to gains and losses. An early fronto-central negativity was elicited when feedback was provided for both gains and losses, and correlated with the number of gains at FCz and with the number of both gains and losses at Cz. The P200 component had larger amplitudes to losses and correlated positively with the number of losses. Feedback related negativity (FRN) was higher at frontal, temporal and occipital electrodes in trials with monetary losses. In addition, trials with monetary losses elicited larger P300 magnitudes than trials with monetary gains at all electrode localizations. Conclusions: All ERP components (except P300) were related to participants’ performance in the IGT. Amplitudes of P200 and P300 were associated with the conscious recognition of the error during the decision-making. Performance data and source analysis underline the importance of the medial prefrontal cortex when processing feedback about monetary losses in the IGT.This research was supported by grants from the Spanish Ministry of Science and Innovation (Ministerio de Ciencia y Tecnología), European Regional Development Funds (ERDF) and Ministry of Economy, Industry and Competitiveness (Ministerio de Economía, Industria y Competitividad, Gobierno de España). References: PSI2008-04394, PSI2017-88388-C4-1-R and PSI2017-88388-C4-3-R