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Search Results: 1 - 10 of 465640 matches for " Andrew J.R. Simpson "
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The Dynamic Range Paradox: A Central Auditory Model of Intensity Change Detection
Andrew J.R. Simpson, Joshua D. Reiss
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0057497
Abstract: In this paper we use empirical loudness modeling to explore a perceptual sub-category of the dynamic range problem of auditory neuroscience. Humans are able to reliably report perceived intensity (loudness), and discriminate fine intensity differences, over a very large dynamic range. It is usually assumed that loudness and intensity change detection operate upon the same neural signal, and that intensity change detection may be predicted from loudness data and vice versa. However, while loudness grows as intensity is increased, improvement in intensity discrimination performance does not follow the same trend and so dynamic range estimations of the underlying neural signal from loudness data contradict estimations based on intensity just-noticeable difference (JND) data. In order to account for this apparent paradox we draw on recent advances in auditory neuroscience. We test the hypothesis that a central model, featuring central adaptation to the mean loudness level and operating on the detection of maximum central-loudness rate of change, can account for the paradoxical data. We use numerical optimization to find adaptation parameters that fit data for continuous-pedestal intensity change detection over a wide dynamic range. The optimized model is tested on a selection of equivalent pseudo-continuous intensity change detection data. We also report a supplementary experiment which confirms the modeling assumption that the detection process may be modeled as rate-of-change. Data are obtained from a listening test (N = 10) using linearly ramped increment-decrement envelopes applied to pseudo-continuous noise with an overall level of 33 dB SPL. Increments with half-ramp durations between 5 and 50,000 ms are used. The intensity JND is shown to increase towards long duration ramps (p<10?6). From the modeling, the following central adaptation parameters are derived; central dynamic range of 0.215 sones, 95% central normalization, and a central loudness JND constant of 5.5×10?5 sones per ms. Through our findings, we argue that loudness reflects peripheral neural coding, and the intensity JND reflects central neural coding.
Cáncer oral: Métodos de diagnóstico (screening) rápido en la consulta odontológica
Barbany,J.R.;
Avances en Odontoestomatología , 2008, DOI: 10.4321/S0213-12852008000100013
Abstract: different proceedings marketed for a quick diagnostic of oral mucosa lesions, suspicious of cancer at the dentistry cabinet, are reviewed. among the different methods proposed: colour staining, fluorescence light and optimized brush biopsy computer monitored and analyzed by a specially trained anatomopathological team, this one seems the most referenced with a better level of safety and confidence.
Impact of Socio-Economic Factors on the Performance of Small-Scale Enterprises in Osun State, Nigeria
J.R. Aworemi
International Business Management , 2012,
Abstract: This study examined the impact of socio-economic characteristics on the performance of small-scale enterprises in the study area. It also identified the salient impacts of socio-economic traits on the development and expansion of small-scale enterprises in the country; established the productive prospects of progressive small-scale enterprises in the study area. The study was carried out in Osogbo, Osun State, Nigeria where copies of structured questionnaire were purposively administered on selected respondents. Evidence from the study shows that socio-economic characteristics of small scale entrepreneurs tend to influence the performance and productivity of SSEs. Further analysis shows that gender, age and educational qualification had significant influence on the performance of the selected small-scale enterprises in the study area. The study suggests integrated approach to the development of individual entrepreneurial capacity and promotion of sustainable small-scale enterprises.
Las relaciones entre ciencia y sociedad: hacia una sociología histórica del conocimiento científico
J.R. Blanco
Política y Sociedad , 1993, DOI: -
Abstract: Sin resumen
Sobre sujetos virtuales y mundos digitales: el caso de las comunidades virtuales
J.R. Blanco
Política y Sociedad , 1999, DOI: -
Abstract: Sin resumen
El trabajo del sociólogo
J.R. Blanco
Política y Sociedad , 1996, DOI: -
Abstract: Sin resumen
The amelioration of British West Indian slavery, 1750-1834: technical change and the plough
J.R. Ward
Nieuwe West-Indische Gids , 1989,
Abstract: Discussion of technical adaption during the period of slavery, achieved through modified processing equipment, and greater attention to manuring, livestock, and fodder supplies. The author examines also the plough as a substitute for the hoe in cultivation.
Cáncer oral: Métodos de diagnóstico (screening) rápido en la consulta odontológica Oral cancer: Quick diagnostic screening in dentistry
J.R. Barbany
Avances en Odontoestomatología , 2008,
Abstract: Se analizan los procedimientos existentes en el mercado, destinados al diagnóstico rápido de lesiones de la mucosa oral sospechosas de malignidad, en la consulta odontológica. De entre los distintos métodos propuestos: tinción con colorantes, iluminación con luz fluorescente y biopsia optimizada con toma de muestras ("brush biopsy"), monitorizada por computadora y valorada por un equipo específico de anátomo-patólogos, éste último es el que más documentado y con un mayor nivel de garantía y seguridad. Different proceedings marketed for a quick diagnostic of oral mucosa lesions, suspicious of cancer at the dentistry cabinet, are reviewed. Among the different methods proposed: colour staining, fluorescence light and optimized brush biopsy computer monitored and analyzed by a specially trained anatomopathological team, this one seems the most referenced with a better level of safety and confidence.
DIE WAT WEN 'n Generaal se storie uit 'n era van oorlog en vrede
J.R. Dutton
Scientia Militaria : South African Journal of Military Studies , 2012, DOI: 10.5787/24-2-277
Abstract: The title of this book of General Jannie Geldenhuys he explains in his ultimate paragraph. Napoleon, when asked on an occasion, which soldiers were the best, replied : "Those who are victorious" - Die wat wen. Jannie Geldenhuys served during his last decade in the South African Defence Force as Chief of the Army and thereafter as Chief of the SADF. During those years he certainly exercised command over victorious South African soldiers, soldiers (or rather servicemen) who maintianed the record of those who served in the two World Wars of this 20th Century.
Review: Big Bear, by Rudy Wiebe
Miller, J.R.
Journal of Historical Biography , 2009,
Abstract:
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