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This is the first study to analyze variations in time estimation during 60 h of sleep deprivation and the relation between time estimation performance and the activation measures of skin resistance level, body temperature, and Stanford Sleepiness Scale (SSS) scores. Among 30 healthy participants 18 to 24 years of age, for a 10-s interval using the production method, we found a lengthening in time estimations that was modulated by circadian oscillations. No differences in gender were found in the time estimation task during sleep deprivation. The variations in time estimation correlated significantly with body temperature, skin resistance level, and SSS throughout the sleep deprivation period. When body temperature is elevated, indicating a high level of activation, the interval tends to be underestimated, and vice versa. When the skin resistance level or SSS is elevated (low activation), time estimation is lengthened, and vice versa. This lengthening is important because many everyday situations involve duration estimation under moderate to severe sleep loss. Actual or potential applications of this research include transportation systems, emergency response work, sporting activities, and industrial settings in which accuracy in anticipation or coincidence timing is important for safety or efficiency. 相似文献
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Gualberto Buela-Casal Izabela Zych Ana Medina María I. Viedma Del Jesus Susana Lozano Gloria Torres 《Scientometrics》2009,80(1):265-282
The study discusses the necessity to analyze the influence of theoretical and empirical types of journal articles on the citation
impact of Spanish psychology journals. Three of the most representative Spanish psychology journals were selected for the
purposes of this study: Papeles del Psicólogo, Análisis y Modificación de Conducta and Psicothema. Twenty-three psychology journals in Spanish were used as source journals. Altogether, there were sixty-seven issues reviewed
for the references and ninety-three issues for the articles. The bibliometricanalysis was conducted by six highly trained
psychologists. The results demonstrated differences regarding the percentages of empirical and theoretical articles published
in the three examined journals and the number of citations received by them based on the article type. When normalizing the
results according to the number of theoretical and empirical articles that were published, it becomes evident that the theoretical
articles receive on average twice as many references as the empirical ones. We discuss the importance of this effect on the
comparison of journals based on their citation impact and show the evidence that it is only valid to compare journals which
publish a similar percentage of theoretical and empirical articles. 相似文献
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Gualberto Buela-Casal Olga Gutiérrez-Martínez María Paz Bermúdez-Sánchez Oscar Vadillo-Muñoz 《Scientometrics》2007,71(3):349-365
International academic rankings that compare world universities have proliferated recently. In accordance with latter conceptual
and methodological advances in academic rankings approaches, five selection criteria are defined and four international university
rankings are selected. A comparative analysis of the four rankings is presented taking into account both the indicators frequency
and its weights. Results show that, although some indicators differ considerably across selected rankings and even many indicators
are unique, indicators referred to research and scientific productivity from university academic staff have a prominent role
across all approaches. The implications of obtained data for main rankings consumers are discussed. 相似文献
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Buela-Casal Gualberto Perakakis Pandelis Taylor Michael Checa Purificación 《Scientometrics》2006,67(1):45-65
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The impact factor is a highly polemic metric. It was designed to help scientists in searching for bibliographic references for their own works, enabling communication among researchers and helping librarians in deciding which journal they should purchase. Nevertheless, it has soon become the most important measure of scientific performance applied to journals, articles, scientists, universities, etc. Since then, some researchers argue that it is a useless and flawed measure, while others defend its utility. The current study is the first survey on the opinion on the topic of a broad sample of scientists from all over the world. The questionnaire was answered by 1,704 researchers from 86 different countries, all the continents and all the UNESCO major fields of knowledge. The results show that the opinion is slightly above the median which could be understood as ??neither positive nor negative??. Surprisingly, there is a negative correlation between the number of articles published by the respondents and their opinion on the impact factor. 相似文献
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JC Sierra G Luna-Villegas G Buela-Casal A Fernández-Guardiola 《Canadian Metallurgical Quarterly》1997,11(4):367-372
Patients with medically intractable trigeminal neuralgia characterized by paroxysmal, triggered, trigeminally distributed pain are excellent candidates for neurosurgical intervention, which can not only relieve the pain of trigeminal neuralgia, but also eliminate the unpleasant side effects of medicines used to treat it. The two major neurosurgical choices are percutaneous denervation and microvascular decompression (MVD). Percutaneous denervation is done best when the surgeon has available radiofrequency and glycerol and uses one, the other, or both depending on technical circumstances that pertain to each patient. The percutaneous denervation is less likely than MVD to cause death, stroke, facial weakness, or hearing loss, but more likely to be associated with recurrence or dysesthesias. Patients with multiple sclerosis, medical illness, or who are elderly are much better candidates for percutaneous denervation. For any patient, a number of other factors also must be considered before deciding on a particular procedure. These include response to previous interventions, ability to tolerate carbamazepine, risk tolerance for various complications, preference regarding duration of hospital stay and postoperative recovery, presence of pain outside the trigeminal distribution, and findings on a high resolution magnetic resonance imaging (MRI) scan. 相似文献
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