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  • Anikin, Andrey, et al. (författare)
  • Human Non-linguistic Vocal Repertoire : Call Types and Their Meaning
  • 2018
  • Ingår i: Journal of Nonverbal Behavior. - : Springer. - 1573-3653 .- 0191-5886. ; 42:1, s. 53-80
  • Tidskriftsartikel (refereegranskat)abstract
    • Recent research on human nonverbal vocalizations has led to considerable progress in our understanding of vocal communication of emotion. However, in contrast to studies of animal vocalizations, this research has focused mainly on the emotional interpretation of such signals. The repertoire of human nonverbal vocalizations as acoustic types, and the mapping between acoustic and emotional categories, thus remain underexplored. In a cross-linguistic naming task (Experiment 1), verbal categorization of 132 authentic (non-acted) human vocalizations by English-, Swedish- and Russian-speaking participants revealed the same major acoustic types: laugh, cry, scream, moan, and possibly roar and sigh. The association between call type and perceived emotion was systematic but non-redundant: listeners associated every call type with a limited, but in some cases relatively wide, range of emotions. The speed and consistency of naming the call type predicted the speed and consistency of inferring the caller's emotion, suggesting that acoustic and emotional categorizations are closely related. However, participants preferred to name the call type before naming the emotion. Furthermore, nonverbal categorization of the same stimuli in a triad classification task (Experiment 2) was more compatible with classification by call type than by emotion, indicating the former's greater perceptual salience. These results suggest that acoustic categorization may precede attribution of emotion, highlighting the need to distinguish between the overt form of nonverbal signals and their interpretation by the perceiver. Both within- and between-call acoustic variation can then be modeled explicitly, bringing research on human nonverbal vocalizations more in line with the work on animal communication.
  • Baird, Emily, et al. (författare)
  • X-ray micro computed-tomography
  • 2017
  • Ingår i: Current Biology. - : Elsevier. - 0960-9822. ; 27:8, s. 289-291
  • Tidskriftsartikel (refereegranskat)abstract
    • Emily Baird and Gavin Taylor describe how you can make three-dimensional models of biological samples using x-ray micro-computed tomography
  • Bexell, Göran, et al. (författare)
  • "Ge forskningen mer resurser"
  • 2003
  • Ingår i: Sydsvenska dagbladet. - : Sydsvenska Dagbladet. - 1104-0068.
  • Tidskriftsartikel (populärvet., debatt m.m.)
  • Bodnar, Taras, et al. (författare)
  • A linear test for the global minimum variance portfolio for small sample and singular covariance
  • 2015
  • Annan publikation (övrigt vetenskapligt)abstract
    • Bodnar and Schmid (2008) derived the distribution of the global minimum variance portfolio weights and obtained the distribution of the test statistics for the general linear hypothesis. Their results are obtained in the case when the number of observations n is bigger or equal than the size of portfolio k. In the present paper, we extend the result by analyzing the portfolio weights in a small sample case of n < k, with the singular covariance matrix. The results are illustrated using actual stock returns. A discussion of practical relevance of the model is presented.
  • Chakwizira, Arthur, et al. (författare)
  • Diffusion MRI with pulsed and free gradient waveforms : effects of restricted diffusion and exchange
  • 2023
  • Ingår i: NMR in Biomedicine. - : John Wiley & Sons Inc.. - 0952-3480 .- 1099-1492. ; 36:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Monitoring time-dependence with diffusion MRI yields observables sensitive to compartment sizes (restricted diffusion) and membrane permeability (water exchange). However, restricted diffusion and exchange have opposite effects on the diffusion-weighted signal, which can lead to errors in parameter estimates. In this work, we propose a signal representation that incorporates the effects of both restricted diffusion and exchange up to second order in b-value and is compatible with gradient waveforms of arbitrary shape. The representation features mappings from a gradient waveform to two scalars that separately control the sensitivity to restriction and exchange. We demonstrate that these scalars span a two-dimensional space that can be used to choose waveforms that selectively probe restricted diffusion or exchange, eliminating the correlation between the two phenomena. We found that waveforms with specific but unconventional shapes provide an advantage over conventional pulsed and oscillating gradient acquisitions. We also show that parametrisation of waveforms into a two-dimensional space can be used to understand protocols from other approaches that probe restricted diffusion and exchange. For example, we found that the variation of mixing time in filter-exchange imaging corresponds to variation of our exchange-weighting scalar at a fixed value of the restriction-weighting scalar. The proposed signal representation was evaluated using Monte Carlo simulations in identical parallel cylinders with hexagonal and random packing as well as parallel cylinders with gamma-distributed radii. Results showed that the approach is sensitive to sizes in the interval 4 - 12 μm and exchange rates in the simulated range of 0 to 20 s -1 , but also that there is a sensitivity to the extracellular geometry. The presented theory constitutes a simple and intuitive description of how restricted diffusion and exchange influence the signal as well as a guide to protocol design capable of separating the two effects.
  • Dunér, David, et al. (författare)
  • Perseverance
  • 2022. - 1
  • Ingår i: Pandemic Ponderings. - Uppsala : Swedish Collegium for Advanced Study. - 9789198194838 ; , s. 73-85
  • Bokkapitel (populärvet., debatt m.m.)
  • Dunér, David, et al. (författare)
  • Un café con… David Dunér
  • 2020
  • Ingår i: ¿Estamos solos? : En busca de otras vidas en el Cosmos - En busca de otras vidas en el Cosmos. - Barcelona : Critica. - 9788491992394
  • Bokkapitel (populärvet., debatt m.m.)
  • Fredriksson, Alexandra, et al. (författare)
  • Conceptual Blending Monitoring Students’ Use of Metaphorical Concepts to Further the Learning of Science
  • 2020
  • Ingår i: Research in Science Education. - : Springer. - 0157-244X .- 1573-1898. ; 50:3, s. 917-940
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this study is to explore how tertiary science students’ use of metaphors in their popular science article writing may influence their understanding of subject matter. For this purpose, six popular articles written by students in physics or geology were analysed by means of a close textual analysis and a metaphor analysis. In addition, semi-structured interviews were conducted with the students. The articles showed variation regarding the occurrence of active (non-conventional) metaphors, and metaphorical concepts, i.e. metaphors relating to a common theme. In addition, the interviews indicated that students using active metaphors and metaphorical concepts reflected more actively upon their use of metaphors. These students also discussed the possible relationship between subject understanding and creation of metaphors in terms of conceptual blending. The study suggests that students’ process of creating metaphorical concepts could be described and visualised through integrated networks of conceptual blending. Altogether, the study argues for using conceptual blending as a tool for monitoring and encouraging the use of adequate metaphorical concepts, thereby facilitating students’ opportunities of understanding and influencing the learning of science.
  • Hertog, Iris, et al. (författare)
  • Barriers to expanding continuous cover forestry in Sweden for delivering multiple ecosystem services
  • 2022
  • Ingår i: Ecosystem Services. - : Elsevier. - 2212-0416. ; 53
  • Tidskriftsartikel (refereegranskat)abstract
    • Sweden has the largest forest cover in the European Union, and for decades, Sweden's forest industry has pursued intensive forest management through tree plantations and clear-cutting in order to maximize wood production. The Swedish forestry sector is increasingly under pressure to transition away from intensive clear-cut forest management, but other forest management models are still a niche in Sweden’s forest management and face barriers in their wider uptake. We use transition theory and the multi-level perspective framework to analyse the dynamics within the Swedish forestry sector, and investigate the barriers that actors practicing and promoting Continuous Cover Forestry in Sweden face. We identify culture, forestry education, industrial networks and timber markets as domains where there is a mismatch between Continuous Cover Forestry and the current clear-cut forest management. Our analysis shows that the limited uptake of Continuous Cover Forestry in Sweden has explanations that go far beyond the lack of knowledge and ecological limitations that it is often associated with. Thus, we conclude that research and policy-making need to account for these diverse explanations and address the power and social dimensions associated with competing forest management models for building multi-functional forest ecosystems in the future.
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