A study of exploratory behavior as an index of spatial knowledge in hamsters     

Bruno Poucet  Nicole Chapuis  Madeleine Durup  Catherine Thinus-Blanc 《Learning & behavior》1986,14(1):93-100

This experiment investigated the role of exploration in the formation of maps of the environment. The effects of spatial rearrangement of four familiar objects in an open field on subsequent exploratory behavior were studied in hamsters (Mesocricetus auratus). During two exploratory sessions, four groups of subjects were exposed to objects in a particular spatial relation to each other and to a distal pattern. During a testing session, the control group was exposed to the same situation as during the first two sessions, and the three experimental groups were exposed to various object rearrangements. The hamsters in the experimental groups, but not those in the control group, renewed their exploration of the objects during the testing session, as measured by the number of contacts with the objects and the time spent investigating them. Further analyses of the nature of the reinvestigated objects (i.e., displaced or nondisplaced) support the hypothesis that, through exploration, a long-lasting representation of the environment is built up on the basis of the topological relations among the objects, the overall geometric structure provided by the arrangement of the objects, and the relations between the objects and extra-apparatus landmarks.  相似文献   

School Mapping Restructure in China: What role for the small rural school?     

Dan Zhao  Bruno Parolin 《Frontiers of Education in China》2011,6(2):248-278

Despite significant progress over the past fifteen years associated with School Mapping Restructure (SMR) in Chinese rural schools, many small schools have been closed or have merged with larger primary schools. This has resulted, among other things, in difficulties for many students in rural areas who now have to travel longer distances to a central (primary) school and whose families generally have to bear greater expenses for schooling. This paper examines the role of small rural schools in the Chinese education system, looks at the context and impacts of SMR on these schools in terms of quality, cost and access indicators, and highlights some of the key difficulties faced by these schools in the restructured education system. We argue that small rural schools have a significant role to play in delivering education services in rural China and should therefore be retained, supported and equipped with the right levels of facilities and quality services for them to fulfill their role. The policy implications of these findings for education officials are discussed in the context of continuing SMR.  相似文献   

Effects of targeted interventions and of specific instructional time on reading ability in French children in grade 1     

Ecalle  Jean  Magnan  Annie  Auphan  Pauline  Gomes  Christophe  Cros  Laurent  Suchaut  Bruno 《European Journal of Psychology of Education - EJPE》2022,37(3):605-625

European Journal of Psychology of Education - The aim is to examine the impact of interventions on fluency and reading comprehension and how the effects of these interventions depend on the time...  相似文献   

Effects of Population Heterogeneity on Accuracy of DIF Detection     

María Elena Oliveri  Kadriye Ercikan  Bruno D. Zumbo 《教育实用测度》2014,27(4):286-300

Heterogeneity within English language learners (ELLs) groups has been documented. Previous research on differential item functioning (DIF) analyses suggests that accurate DIF detection rates are reduced greatly when groups are heterogeneous. In this simulation study, we investigated the effects of heterogeneity within linguistic (ELL) groups on the accuracy of DIF detection. Heterogeneity within such groups may occur for a myriad of reasons including differential lengths of time residing in English-speaking countries, degrees of exposure to English-speaking environments, and amounts of English instruction. Our findings revealed that at high levels of within-group heterogeneity, DIF detection is at the level of chance, implying that a large proportion of DIF items might remain undetected when assessing heterogeneous populations potentially leading to developing biased tests. Based on our findings, we urge test development organizations to consider heterogeneity within ELL and other heterogeneous focus groups in their routine DIF analyses.  相似文献   

Test–retest reliability of the 30–15 Intermittent Fitness Test: A systematic review     

Jozo Grgic  Bruno Lazinica  Zeljko Pedisic 《运动与健康科学(英文)》2021,10(4):413

PurposeThis review aimed to synthesize previous findings on the test–retest reliability of the 30–15 Intermittent Fitness Test (IFT).MethodsThe literature searches were performed in 8 databases. Studies that examined the test–retest reliability of the 30–15 IFT and presented the intraclass correlation coefficient (ICC) and/or the coefficient of variation (CV) for maximal velocity and/or peak heart rate were included. The consensus-based standards for the selection of health measurement instruments (COSMIN) checklist was used for the assessment of the methodological quality of the included studies.ResultsSeven studies, with a total of 10 study groups, explored reliability of maximal velocity assessed by the 30–15 IFT. ICCs ranged from 0.80 to 0.99, where 70% of ICCs were ≥0.90. CVs for maximal velocity ranged from 1.5% to 6.0%. Six studies, with a total of 7 study groups, explored reliability of peak heart rate as assessed by the 30–15 IFT. ICCs ranged from 0.90 to 0.97 (i.e., all ICCs were ≥0.90). CVs ranged from 0.6% to 4.8%. All included studies were of excellent methodological quality.ConclusionFrom the results of this systematic review, it can be concluded that the 30–15 IFT has excellent test–retest reliability for both maximal velocity and peak heart rate. The test may, therefore, be used as a reliable measure of fitness in research and sports practice.  相似文献   

Consequences of Vertical Separation and Monopoly: Evidence From the Telecom Privatizations     

Bruno E. Viani 《Journal of Media Economics》2013,26(2):70-97

Policy variation across countries on the use of mandatory vertical separation and statutory monopoly allows the assessment of their impact on basic telephone services (local, long distance, and international service). Panel data analysis from 56 countries during the 7-year period following the privatization of the main telephone provider indicates that vertical separation and monopoly harm the consumers that were supposed to benefit: the downstream users of international telephony and the upstream users of residential local telephony. Mandatory vertical separation reduces the usage of international telephone service and the number of fixed lines in service, whereas statutory monopoly reduces the amount of fixed lines in service and increases the price of local residential telephony.  相似文献   

Do Consonant Sonority and Status Influence Syllable-Based Segmentation Strategies in a Visual Letter Detection Task? Developmental Evidence in French Children     

Norbert Maïonchi-Pino  Bruno de Cara  Jean Écalle  Annie Magnan 《Scientific Studies of Reading》2013,17(6):550-562

This article queries whether consonant sonority (sonorant vs. obstruent) and status (coda vs. onset) within intervocalic clusters influence syllable-based segmentation strategies. We used a modified version of the illusory conjunction paradigm to test whether French beginning, intermediate, and advanced readers were sensitive to an optimal “sonorant coda–obstruent onset” sonority profile within the syllable boundaries as a cue for a syllable-based segmentation. Data showed that children used a syllable-based segmentation that improved with reading skills and age. The results are discussed to support that the visual letter detection within pseudowords primarily and early relies on acoustic-phonetic cues within the syllable boundaries, whereas the syllable effect seems to be developmentally constrained by reading skills and age.  相似文献   

Designing interaction metaphors for Web3D cultural dissemination     

Marcello Carrozzino  Nicoletta Bruno  Massimo Bergamasco 《Journal of Cultural Heritage》2013,14(2):146-155

In the last few years the improved performances of graphics hardware and the growing availability of broadband internet connections have eventually led to effectively adding a third dimension to web interfaces, achieving what is commonly referred to as Web3D. Nevertheless, these technologies are not yet widespread, especially in the cultural sector, for at least two factors: technological limitations, mostly in the lack of coherent and effective metaphors to visualize and interact with digital cultural assets using the third-dimension as an added value rather than as a stylish gadget, and communication issues, as, despite the principles stated in the London Charter aimed at ensuring technical and intellectual rigor for the digital visualization of cultural heritage, a proper way to deal with relevant and sustainable 3D information is not yet completely established. For this reason this paper focuses on identifying and analyzing the aspects that may contribute to a more efficient use of Web3D technologies to access cultural content, in order to set up a set of development standards aiming to encourage web-based learning and guaranteeing systems accessible and usable by the widest possible audience.  相似文献   

Microarray of non-connected gold pads used as high density electric traps for parallelized pairing and fusion of cells     

Feriel S. Hamdi  Olivier Fran?ais  Frederic Subra  Elisabeth Dufour-Gergam  Bruno Le Pioufle 《Biomicrofluidics》2013,7(4)

Cell fusion consists of inducing the formation of a hybridoma cell containing the genetic properties of the progenitor cells. Such an operation is usually performed chemically or electrically. The latter method, named electrofusion, is considered as having a strong potential, due to its efficiency and non-toxicity, but deserves further investigations prior to being applicable for key applications like antibody production and cancer immunotherapy. Indeed, to envision such applications, a high amount of hybrid cells is needed. In this context, we present in this paper a device for massive cell pairing and electrofusion, using a microarray of non-connected conductive pads. The electrofusion chamber––or channel––exposes cells to an inhomogeneous electric field, caused by the pads array, enabling the trapping and pairing of cells with dielectrophoresis (DEP) forces prior to electrofusion. Compared to a mechanical trapping, such electric trapping is fully reversible (on/off handling). The DEP force is contactless and thus eases the release of the produced hybridoma. Moreover, the absence of wire connections on the pads permits the high density trapping and electrofusion of cells. In this paper, the electric field mapping, the effect of metallic pads thickness, and the transmembrane potential of cells are studied based on a numerical model to optimize the device. Electric calculations and experiments were conducted to evaluate the trapping force. The structure was finally validated for cell pairing and electrofusion of arrays of cells. We believe that our approach of fully electric trapping with a simple structure is a promising method for massive production of electrofused hybridoma.  相似文献   

Effects of regular training at the same time of day on diurnal fluctuations in muscular performance     

Nizar Souissi  Antoine Gauthier  Bruno Sesboüé  Jacques Larue  Damien Davenne 《Journal of sports sciences》2013,31(11):929-937

The aim of this study was to determine whether there is an effect of time of day on the adaptation to strength training at maximal effort. Fourteen participants took part in this experiment. Their peak anaerobic power (Wingate anaerobic test) and peak knee extension torque at six angular velocities (1.05, 2.10, 3.14, 4.19, 5.24 and 6.29 rad · s -1 ) were recorded in the morning (between 07:00 and 08:00 h) and in the evening (between 17:00 and 18:00 h) just before and 2 weeks after a 6 week course of regular training. Seven of them trained only in the morning and seven only in the evening. Multivariate analysis of variance revealed a significant group 2 pre-/post-training 2 time of day interaction effect for peak torque and peak anaerobic power. Before training, in both groups, peak torque and peak anaerobic power were significantly higher in the evening than in the morning. After training, there was no significant difference in peak torque and peak anaerobic power between the morning and the evening for the morning training group. In contrast, in the evening training group, peak torque and peak anaerobic power were higher in the evening than in the morning. As a result of training, both peak torque and peak anaerobic power increased from their initial values as expected. The morning training group improved their peak anaerobic power significantly in the morning and in the evening, the absolute increase being larger in the morning than in the evening. The evening training group did not improve their peak anaerobic power in the morning, whereas it improved significantly in the evening. Although peak torque was significantly improved by training in the morning and evening in both groups, the absolute increase was greater in the morning than in the evening in the morning training group, whereas the opposite was the case for the evening training group. These results suggest that training twice a week at a specific hour increases the peak torque and the peak anaerobic power specifically at this hour and demonstrates that there is a temporal specificity to strength training.  相似文献