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Université de Fribourg

Preferential out-of-plane conduction and quasi-one-dimensional electronic states in layered 1T-TaS 2

Martino, E. ; Pisoni, A. ; Ćirić, L. ; Arakcheeva, A. ; Berger, H. ; Akrap, Ana ; Putzke, C. ; Moll, P. J. W. ; Batistić, I. ; Tutiš, E. ; Forró, László ; Semeniuk, K.

In: npj 2D Materials and Applications, 2020, vol. 4, no. 1, p. 1–9

Layered transition metal dichalcogenides (TMDs) are commonly classified as quasi-two-dimensional materials, meaning that their electronic structure closely resembles that of an individual layer, which results in resistivity anisotropies reaching thousands. Here, we show that this rule does not hold for 1T-TaS2—a compound with the richest phase diagram among TMDs. Although the onset of ...

Université de Fribourg

Resting-state EEG topographies: Reliable and sensitive signatures of unilateral spatial neglect

Pirondini, Elvira ; Goldshuv-Ezra, Nurit ; Zinger, Nofya ; Britz, Juliane ; Soroker, Nachum ; Deouell, Leon Y. ; Van De\Ville, Dimitri

In: NeuroImage: Clinical, 2020, vol. 26, p. 102237

Theoretical advances in the neurosciences are leading to the development of an increasing number of proposed interventions for the enhancement of functional recovery after brain damage. Integration of these novel approaches in clinical practice depends on the availability of reliable, simple, and sensitive biomarkers of impairment level and extent of recovery, to enable an informed ...

Université de Fribourg

Soft, implantable bioelectronic interfaces for translational research

Schiavone, Giuseppe ; Fallegger, Florian ; Kang, Xiaoyang ; Barra, Beatrice ; Vachicouras, Nicolas ; Roussinova, Evgenia ; Furfaro, Ivan ; Jiguet, Sébastien ; Seáñez, Ismael ; Borgognon, Simon ; Rowald, Andreas ; Li, Qin ; Qin, Chuan ; Bézard, Erwan ; Bloch, Jocelyne ; Courtine, Grégoire ; Capogrosso, Marco ; Lacour, Stéphanie P.

In: Advanced Materials, 2020, vol. 32, no. 17, p. 1906512

The convergence of materials science, electronics, and biology, namely bioelectronic interfaces, leads novel and precise communication with biological tissue, particularly with the nervous system. However, the translation of lab‐ based innovation toward clinical use calls for further advances in materials, manufacturing and characterization paradigms, and design rules. Herein, a ...

Université de Fribourg

Striatal reactivity to reward under threat-of-shock and working memory load in adults at increased familial risk for major depression: A preliminary study

Gaillard, Claudie ; Guillod, Matthias ; Ernst, Monique ; Federspiel, Andrea ; Schoebi, Dominik ; Recabarren, Romina Evelyn ; Ouyang, Xinyi ; Mueller-Pfeiffer, Christoph ; Horschg, Antje ; Homan, Philipp ; Wiest, Roland ; Hasler, Gregor ; Martin-Soelch, Chantal

In: NeuroImage: Clinical, 2020, vol. 26, p. 102193

Introduction: Anhedonia, a core symptom of Major Depressive Disorder (MDD), manifests as a lack or loss of motivation as reflected by decreased reward responsiveness, at both behavioral and neural (i.e., striatum) levels. Exposure to stressful life events is another important risk factor for MDD. However, the mechanisms linking reward-deficit and stress to MDD remain poorly understood. Here,...

Université de Fribourg

Anatomic analysis of the internal and external aspects of the pterion

Uz, Aysun ; Korkmaz, Ali Can ; Filgueira, Luis ; Guner, Mehmet Ali ; Tubbs, Richard Shane ; Demirciler, Ayse Karatas

In: World Neurosurgery, 2020, vol. 137, p. 84–88

Objective: The pterion is an H-shaped suture complex. This study's goal was to determine the location of its external and internal surfaces and extension and emphasize and discuss its surgical importance.Methods: Fifty dried adult human skulls were obtained from the Department of Anatomy. A 2-mm drill bit was placed externally over the pterion, and the pterion was drilled through the bone...

Université de Fribourg

Dorronsoro’s theorem in Heisenberg groups

Fässler, Katrin ; Orponen, Tuomas

In: Bulletin of the London Mathematical Society, 2020, vol. 52, no. 3, p. 472–488

A theorem of Dorronsoro from the 1980s quantifies the fact that real‐valued Sobolev functions on Euclidean spaces can be approximated by affine functions almost everywhere, and at all sufficiently small scales. We prove a variant of Dorronsoro's theorem in Heisenberg groups: functions in horizontal Sobolev spaces can be approximated by affine functions which are independent of the last...

Université de Fribourg

Fundamental polytopes of metric trees via parallel connections of matroids

Delucchi, Emanuele ; Hoessly, Linard

In: European Journal of Combinatorics, 2020, vol. 87, p. 103098

We tackle the problem of a combinatorial classification of finite metric spaces via their fundamental polytopes, as suggested by Vershik (2010).In this paper we consider a hyperplane arrangement associated to every split pseudometric and, for tree-like metrics, we study the combinatorics of its underlying matroid.- We give explicit formulas for the face numbers of fundamental polytopes and ...

Université de Fribourg

Locally homogeneous aspherical Sasaki manifolds

Baues, Oliver ; Kamishima, Yoshinobu

In: Differential Geometry and its Applications, 2020, vol. 70, p. 101607

Université de Fribourg

The Dynamic Reorganization of Cortical Network Interactions during Visual Selective Attention

Pagnotta, Mattia ; Plomp, Gijs (Dir.)

Thèse de doctorat : Université de Fribourg, 2020.

Visual selective attention prioritizes the processing of behaviorally relevant over irrelevant information, to optimize the use of limited cognitive resources in the brain. These selective mechanisms preferentially route relevant neuronal representations through a network of distributed brain regions. Previous studies suggested that selective information routing in the attention network may...