Search results for "mathematics"
showing 10 items of 22031 documents
An optimal population code for global motion estimation in local direction-selective cells
2021
AbstractNervous systems allocate computational resources to match stimulus statistics. However, the physical information that needs to be processed depends on the animal’s own behavior. For example, visual motion patterns induced by self-motion provide essential information for navigation. How behavioral constraints affect neural processing is not known. Here we show that, at the population level, local direction-selective T4/T5 neurons in Drosophila represent optic flow fields generated by self-motion, reminiscent to a population code in retinal ganglion cells in vertebrates. Whereas in vertebrates four different cell types encode different optic flow fields, the four uniformly tuned T4/T5…
Oxidative stability of virgin olive oil: evaluation and prediction with an adaptive neuro-fuzzy inference system (ANFIS).
2019
Background An adaptive neuro-fuzzy inference system (ANFIS) was employed to predict the oxidative stability of virgin olive oil (VOO) during storage as a function of time, storage temperature, total polyphenol, α-tocopherol, fatty acid profile, ultraviolet (UV) extinction coefficient (K268 ), and diacylglycerols (DAGs). Results The mean total quantities of polyphenols and DAGs were 1.1 and 1.9 times lower in VOOs stored at 25 °C than in the initial samples, and the mean total quantities of polyphenols and DAGs were 1.3 and 2.26 times lower in VOOs stored at 37 °C than in the initial samples, respectively. In a single sample, α-tocopherol was reduced by between 0.52 and 0.91 times during sto…
Comparison of conventional descriptive analysis and a citation frequency-based descriptive method for odor profiling: An application to Burgundy Pino…
2010
International audience; The limitations of intensity scoring when describing the odor characteristics of a complex product have been documented in the literature. In the present work, the odor properties of 12 Burgundy Pinot noir wines were described by two independent panels performing, respectively, an intensity-based (conventional descriptive analysis) and a citation frequency-based method. Methods were compared according to three criteria: similarity of the sensory maps, control of panel performance and practical aspects. Intensity scoring and citation frequency data were analyzed, respectively, by Principal Components Analysis (PCA) and Correspondence Analysis (CA) followed by Hierarch…
A comparison between nine laboratories performing triangle tests
2012
WOS: 000299451400001; International audience; Fifteen groups of participants in nine laboratories performed triangle tests with two pairs of soft drinks. Groups differed in practice level with triangle tests: eight groups of 60 consumers who were not used to triangle test, three groups of qualified assessors who have already performed a few triangle tests, and four groups of trained assessors with a more extensive practice of triangle tests; qualified and trained groups included 9 or 18 assessors. The soft drinks were made from syrups at two levels of dilution in order to achieve about 55% of correct responses to test for difference and about 40% of correct responses to test for similarity.…
Neighbourhood socio-economic characteristics and the risk of preterm birth for migrant and non-migrant women: a study in a French district
2011
Neighbourhood-level deprivation is associated with preterm birth; preterm birth rates are also higher for some, but not all migrant groups. We studied the impact of neighbourhood characteristics (a deprivation score and the proportion of foreign-born residents) on singleton preterm birth in the French district of Seine-Saint-Denis for women born in France, North Africa, sub-Saharan Africa and other countries. Multilevel logistic regression models were adjusted for maternal demographic and health care characteristics. For women born in France, the preterm birth rate rose with neighbourhood deprivation quintile (3.8% in the first to 5.7% in the fifth, adjusted odds ratio: 1.40 [95% confidence…
Metaphor comprehension in children with and without autism spectrum disorder
2020
Abstract Metaphor comprehension was studied in three groups of children from 6 to 12 years old: a group with autism spectrum disorder with level 2 severity (ASD, n = 22) and two comparison groups with typical development: one matched with the ASD group on chronological age (TCD group, n = 22) and the other matched on linguistic age (TLD group, n = 22). The TCD group performed better than the TLD group, which performed better than the ASD group, on the comprehension of both conventional and novel metaphors, with better performance found on conventional metaphors than on novel ones. We suggest that both linguistic and extralinguistic competencies (usually limited in level 2 ASD) would be nece…
Teacher preparation for inclusion in Norway: a study of beliefs, skills, and intended practices
2017
ABSTRACTThe aim of this study was to examine the relationship between the educational experiences of teacher education students and their attitudes towards planning and making adaptations for children with learning disabilities in inclusive classrooms. Participants comprised pre-service teachers in the second and fourth years of teacher preparation at a major Norwegian university. Fourth-year students were completing a 1-year elective in special education (n = 34) or coursework in other subjects (n = 30). Second-year students were grouped based on their intention to take special education (n = 26) or other coursework (n = 62). Participants rated their beliefs, skills, and intended practices…
Learning about students in co-teaching teams
2021
Teachers are facing increasingly diverse classrooms globally. To support all students efficiently, teachers need to know their students. Drawing from the literature of teacher learning and inclusive education, we explored how teachers learn to know their students in a co-teaching context. Analysis of interviews and diaries of five co-teaching teams showed that teachers learned about their students in a co-taught classroom by observing students and by obtaining knowledge from and co-constructing knowledge with their co-teaching partner. Moreover, teachers’ learning led to shared responsibility for the student and a better understanding of student diversity. Thus, sharing knowledge of student…
Compound conditionals as random quantities and Boolean algebras
2022
Conditionals play a key role in different areas of logic and probabilistic reasoning, and they have been studied and formalised from different angles. In this paper we focus on the de Finetti's notion of conditional as a three-valued object, with betting-based semantics, and its related approach as random quantity as mainly developed by two of the authors. Compound conditionals have been studied in the literature, but not in full generality. In this paper we provide a natural procedure to explicitly attach conditional random quantities to arbitrary compound conditionals that also allows us to compute their previsions. By studying the properties of these random quantities, we show that, in f…
Systemic Risk in a Structural Model of Bank Default Linkages
2018
Abstract We study a structural model of individual bank defaults across the banking sector; banks are interconnected through their exposure to a common risk factor. The paper introduces a systemic risk measure based on the default frequency in the banking sector; this measure depends non-linearly on the factor's loadings, in contrast to previous systemic risk measures that depend linearly on loadings. We estimate loadings in the U.S. banking system over the course of the last 36 years; we find that they have considerably increased over time and identify four major regimes. Our measure shows that systemic risk became critical in the last of our four regimes, covering the most recent time per…