• Measure profile surrogates: a method to validate the performance of epileptic seizure prediction algorithms

  Kreuz, Thomas; Andrzejak, Ralph Gregor; Mormann, Florian; Kraskov, Alexander; Stögbauer, Harald; Elger, Christian E.; Lehnertz, Klaus; Grassberger, Peter (American Physical Society, 2004)

  In a growing number of publications it is claimed that epileptic seizures can be predicted by analyzing the electroencephalogram (EEG) with different characterizing measures. However, many of these studies suffer from a ...
• Improved statistical test for nonstationarity using recurrence time statistics

  Rieke, Christoph; Andrzejak, Ralph Gregor; Mormann, Florian; Lehnertz, Klaus (American Physical Society, 2003)

  We have recently introduced a measure for nonstationarity using a recurrence time statistic to assess stationarity. In this paper we propose an extension of this method based on a detailed study of the statistics for ...
• Detection of weak directional coupling: phase-dynamics approach versus state-space approach

  Smirnov, Dmitry A.; Andrzejak, Ralph Gregor (American Physical Society, 2005)

  We compare two conceptually different approaches to the detection of weak directional couplings between two oscillatory systems from bivariate time series. The first approach is based on the analysis of the systems’ phase ...
• Independent delta/theta rhythms in the human hippocampus and entorhinal cortex

  Mormann, Florian; Osterhage, Hannes; Andrzejak, Ralph Gregor; Weber, Bernd; Fernández, Guillén; Fell, Juerguen; Elger, Christian E.; Lehnertz, Klaus (Frontiers, 2008)

  Theta oscillations in the medial temporal lobe (MTL) of mammals are involved in various functions such as spatial navigation, sensorimotor integration, and cognitive processing. While the theta rhythm was originally assumed ...
• Using bivariate signal analysis to characterize the epileptic focus: the benefit of surrogates

  Andrzejak, Ralph Gregor; Chicharro Raventós, Daniel; Lehnertz, Klaus; Mormann, Florian (American Physical Society, 2011)

  The disease epilepsy is related to hypersynchronous activity of networks of neurons. While acute epileptic seizures are the most extreme manifestation of this hypersynchronous activity, an elevated level of interdependence ...
• On the spectral formulation of Granger causality

  Chicharro Raventós, Daniel (Springer, 2011)

  Spectral measures of causality are used to explore the role of different rhythms in the causal connectivity between brain regions. We study several spectral measures related to Granger causality, comprising the bivariate ...
• Nonrandomness, nonlinear dependence, and nonstationarity of electroencephalographic recordings from epilepsy patients

  Andrzejak, Ralph Gregor; Schindler, Kaspar A.; Rummel, Christian (American Physiological Society, 2012)

  To derive tests for randomness, nonlinear-independence, and stationarity, we combine surrogates with a nonlinear prediction error, a nonlinear interdependence measure, and linear variability measures, respectively. We apply ...
• Methodological advances in brain connectivity

  Faes, Luca; Andrzejak, Ralph Gregor; Ding, Mingzhou; Kugiumtzis, Dimitris (Hindawi, 2012)

  Determining how distinct neurons or brain regions are connected and communicate with each other is a crucial point in neuroscience, as it allows to investigate how the functional integration of specialized neural populations ...
• Detecting determinism from point processes

  Andrzejak, Ralph Gregor; Mormann, Florian; Kreuz, Thomas (American Physical Society, 2014)

  The detection of a nonrandom structure from experimental data can be crucial for the classification, understanding, and interpretation of the generating process. We here introduce a rank-based nonlinear predictability ...
• An Analysis/synthesis framework for automatic F0 annotation of multitrack datasets

  Salamon, Justin; Bittner, Rachel M.; Bonada, Jordi, 1973-; Bosch, Juan J.; Gómez Gutiérrez, Emilia, 1975-; Bello, Juan Pablo (International Society for Music Information Retrieval (ISMIR), 2017)

  Generating continuous f0 annotations for tasks such as melody extraction and multiple f0 estimation typically involves running a monophonic pitch tracker on each track of a multitrack recording and manually correcting ...
• Gamut reduction through local saturation reduction

  Zamir, Syed Waqas; Vazquez-Corral, Javier; Bertalmío, Marcelo (Society for Imaging Science and Technology, 2017)
• Gamut mapping for visual attention retargeting

  Vazquez-Corral, Javier; Bertalmío, Marcelo (Society for Imaging Science and Technology, 2017)

  Visual attention retargeting attempts to modify an image such that the viewer’s attention is directed to specific regions. Goals include highlighting a particular object or hiding possible problems in the image. In this ...
• Atrial functional and geometrical remodeling in highly trained male athletes: for better or worse?

  Gabrielli, Luigi; Bijnens, Bart; Butakoff, Constantine; Duchateau, Nicolas; Montserrat, Silvia; Merino, Beatriz; Gutierrez, Josep; Paré, Carles; Mont, Lluís; Brugada, Josep; Sitges, Marta (Springer, 2014)

  Purpose Highly trained athletes have an increased risk of atrial arrhythmias. Atrial geometrical and functional remodeling may be the underlying substrate. We analyze and relate atrial size, deformation and performance ...
• Interatrial dyssynchrony may contribute to heart failure symptoms in patients with preserved ejection fraction

  Sanchis, Laura; Vannini, Luca; Gabrielli, Luigi; Duchateau, Nicolas; Falces, Carles; Andrea, Rut; Bijnens, Bart; Sitges, Marta (Wiley, 2015)

  Purpose Heart failure (HF) with preserved ejection fraction (HFPEF) is the most prevalent type of HF in nonhospitalized patients, but its pathophysiology remains poorly understood. The aim of our study was to assess the ...
• Co-creating a web-based visual representation model for authoring blended learning designs

  Albó, Laia; Hernández Leo, Davinia (Scuola IaD, 2019)

  This paper reports the co-creation process carried out during the development of a web-based visual representation model for authoring blended learning designs. The results of several participatory design workshops with ...
• Analysis of UAV communications in cell-free massive MIMO systems

  D’Andrea, Carmen; García Rodríguez, Adrián; Geraci, Giovanni; Galati Giordano, Lorenzo; Buzzi, Stefano (Institute of Electrical and Electronics Engineers (IEEE), 2020)

  We study support for unmanned aerial vehicle (UAV) communications through a cell-freemassive MIMO architecture, wherein a large number of access points (APs) is deployed in place of largeco-located massive MIMO arrays. We ...
• Cell-free massive MIMO for UAV communications

  D’Andrea, Carmen; García Rodríguez, Adrián; Geraci, Giovanni; Galati Giordano, Lorenzo; Buzzi, Stefano (Institute of Electrical and Electronics Engineers (IEEE), 2019)

  We study support for unmanned aerial vehicle (UAV) communications through a cell-free massive MIMO ar- chitecture. Under the general assumption that the propagation channel between the mobile stations, either UAVs or ...
• Cellular UAV-to-UAV communications

  Azari, M. Mahdi; Geraci, Giovanni; García Rodríguez, Adrián; Pollin, Sofie (Institute of Electrical and Electronics Engineers (IEEE), 2019)

  Reliable and direct communication between un-manned aerial vehicles (UAVs) could facilitate autonomous flight, collision avoidance, and cooperation in UAV swarms. In this paper, we consider UAV-to-UAV (U2U) communica-tions ...
• Photorealistic style transfer for cinema shoots

  Zabaleta, Itziar; Bertalmío, Marcelo (Institute of Electrical and Electronics Engineers (IEEE), 2018)

  Color grading is the process of subtly mixing andadjusting the color and tonal balance of a movie to achievea specific visuallook. This manual editing task may requirea significant amount of ...
• BAT: An open-source, web-based audio events annotation tool

  Meléndez Catalán, Blai; Molina, Emilio; Gómez Gutiérrez, Emilia, 1975- (2017)

  In this paper we present BAT (BMAT Annotation Tool), an open-source, web-based tool for the manual annotation of events in audio recordings developed at BMAT (Barcelona Music and Audio Technologies1). The main feature ...

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