• Modified conjugate beamforming for cell-free massive MIMO

  Attarifar, Masoud; Abbasfar, Aliazam; Lozano Solsona, Angel (Institute of Electrical and Electronics Engineers (IEEE), 2019)

  We present a modification of conjugate beamforming for the forward link of cell-free massive MIMO networks. This modification eliminates the self-interference and yields a performance that, without forward pilots, closely ...
• Distribution of the number of users per base station in cellular networks

  George, Geordie; Lozano Solsona, Angel; Haenggi, Martin (Institute of Electrical and Electronics Engineers (IEEE), 2019)

  We consider the number of users associating with each base station in a cellular network. Extending and unifying the characterizations for certain settings available in the literature, we derive a result that is asymptotic ...
• A Machine learning approach to discover rules for expressive performance actions in jazz guitar music

  Giraldo, Sergio; Ramírez, Rafael,1966- (Frontiers, 2016)

  Expert musicians introduce expression in their performances by manipulating sound properties such as timing, energy, pitch, and timbre. Here, we present a data driven computational approach to induce expressive performance ...
• Affine non-local means image denoising

  Fedorov, Vadim; Ballester, Coloma (Institute of Electrical and Electronics Engineers (IEEE), 2017)

  This work presents an extension of the Non-Local Means denoising method, that effectively exploits the affine invariant self-similarities present in images of real scenes. Our method provides a better image denoising ...
• Network events on multiple space and time scales in cultured neural networks and in a stochastic rate model

  Gigante, Guido; Deco, Gustavo; Marom, Shimon; Del Giudice, Paolo (Public Library of Science (PLoS), 2015)

  Cortical networks, in-vitro as well as in-vivo, can spontaneously generate a variety of collective dynamical events such as network spikes, UP and DOWN states, global oscillations, and avalanches. Though each of them has ...
• Increased stability and breakdown of brain effective connectivity during slow-wave sleep: mechanistic insights from whole-brain computational modelling

  Jobst, Beatrice M.; Hindriks, Rikkert; Laufs, Helmut; Tagliazucchi, Enzo; Hahn, Gerald; Ponce-Alvarez, Adrián; Stevner, Angus B. A.; Kringelbach, Morten L.; Deco, Gustavo (Nature Research, 2017)

  Recent research has found that the human sleep cycle is characterised by changes in spatiotemporal patterns of brain activity. Yet, we are still missing a mechanistic explanation of the local neuronal dynamics underlying ...
• Uncovering the underlying mechanisms and whole-brain dynamics of deep brain stimulation for Parkinson’s disease

  Saenger Amoore, Victor Manuel; Kahan, Joshua; Foltynie, Tom; Friston, Karl; Aziz, Tipu Z.; Green, Alex L.; Van Hartevelt, Tim J.; Cabral, Joana R. B.; Stevner, Angus B. A.; Fernandes, Henrique M.; Mancini, Laura; Thornton, John; Yousry, Tarek; Limousin, Patricia; Zrinzo, Ludvic; Hariz, Marwan; Marques, Paulo; Sousa, Nuno; Kringelbach, Morten L.; Deco, Gustavo (Nature Research, 2017)

  Deep brain stimulation (DBS) for Parkinson’s disease is a highly effective treatment in controlling otherwise debilitating symptoms. Yet the underlying brain mechanisms are currently not well understood. Whole-brain ...
• An analysis and speedup of the FALDOI method for Optical Flow estimation

  Gamonal, Ferran P.; Ballester, Coloma; Haro Ortega, Gloria; Meinhardt-Llopis, Enric; Palomares, Roberto P. (Editor Image Processing On Line, 2019)

  We present a detailed analysis of FALDOI, a large displacement optical flow method proposed by P. Palomares et al. This method requires a set of discrete matches, which can be extremely sparse, and an energy functional ...
• An affine invariant patch similarity

  Fedorov, Vadim; Ballester, Coloma (Image Processing On Line, 2018)

  Image and video comparison is often approached by comparing patches of visual information. In this work we present a detailed description and implementation of an affine invariant patch simi- larity measure that performs ...
• Automatic flare spot artifacts detection and removal in photographs

  Vitoria, Patricia; Ballester, Coloma (Springer, 2018)

  Flare spot is one type of are artifact caused by a number of conditions, frequently provoked by one or more high-luminance sources within or close to the camera field of view. When light rays coming from a high-luminance ...
• Lateral orbitofrontal cortex anticipates choices and integrates prior with current information

  Nogueira, Ramon; Abolafia, Juan M.; Drugowitsch, Jan; Balaguer-Ballester, Emili; Sanchez-Vives, Maria V.; Moreno Bote, Rubén (Nature Research, 2017)

  Adaptive behavior requires integrating prior with current information to anticipate upcoming events. Brain structures related to this computation should bring relevant signals from the recent past into the present. Here ...
• Inferring multi-scale neural mechanisms with brain network modelling

  Schirner, Michael; Randal McIntosh, Anthony; Jirsa, Viktor K.; Deco, Gustavo; Ritter, Petra (eLife, 2018)

  The neurophysiological processes underlying non-invasive brain activity measurements are incompletely understood. Here, we developed a connectome-based brain network model that integrates individual structural and functional ...
• Connectome-harmonic decomposition of human brain activity reveals dynamical repertoire re-organization under LSD

  Atasoy, Selen; Roseman, Leor; Kaelen, Mendel; Kringelbach, Morten L.; Deco, Gustavo; Carhart-Harris, Robin L. (Nature Research, 2017)

  Recent studies have started to elucidate the effects of lysergic acid diethylamide (LSD) on the human brain but the underlying dynamics are not yet fully understood. Here we used ’connectome-harmonic decomposition’, a novel ...
• Spontaneous cortical activity is transiently poised close to criticality

  Hahn, Gerald; Ponce-Alvarez, Adrián; Monier, Cyril; Benvenuti, Giacomo; Kumar, Arvind; Chavane, Frédéric; Deco, Gustavo; Frégnac, Yves (Public Library of Science (PLoS), 2017)

  Brain activity displays a large repertoire of dynamics across the sleep-wake cycle and even during anesthesia. It was suggested that criticality could serve as a unifying principle underlying the diversity of dynamics. ...
• Error-based learning and lexical competition in word production: evidence from multilingual naming

  Runnqvist, Elin; Strijkers, Kristof; Costa, Albert, 1970- (Public Library of Science (PLoS), 2019)

  We tested whether learning associated to lexical selection is error-based, and whether lexical selection is competitive by assessing the after-effects of producing words on subsequent production of semantic competitors ...
• Low-complexity MIMO precoding for finite-alphabet signals

  Wu, Yongpeng; Wing Kwan Ng, Derrick; Wen, Chao-Kai; Schober, Robert; Lozano Solsona, Angel (Institute of Electrical and Electronics Engineers (IEEE), 2017)

  This paper investigates the design of precoders for single-user multiple-input multiple-output (MIMO) channels, and, in particular, for finite-alphabet signals. Based on an asymptotic expression for the mutual information ...
• The quest for generalizations over consonants: asymmetries between consonants and vowels are not the by-product of acoustic differences

  Toro Soto, Juan Manuel, 1976-; Shukla, Mohinish; Nespor, Marina; Endress, Ansgar D. (Springer, 2008)

  Consonants and vowels may play different roles during language processing, consonants being preferentially involved in lexical processing, and vowels tending to mark syntactic constituency through prosodic cues. In support ...
• Effective reduced diffusion-models: a data driven approach to the analysis of neuronal dynamics

  Deco, Gustavo; Martí, Daniel; Ledberg, Anders; Reig, Ramon; Sanchez Vives, Maria V. (Public Library of Science (PLoS), 2009)

  We introduce in this paper a new method for reducing neurodynamical data to an effective diffusion equation, either experimentally or using simulations of biophysically detailed models. The dimensionality of the data is ...
• In silico optimization of left a trial appendage occluder implantation using interactive and modeling tools

  Aguado, Ainhoa M.; Olivares, Andy L.; Yagüe, Carlos; Silva, Etelvino; Nuñez-García, Marta; Fernandez-Quilez, Álvaro; Mill, Jordi; Genua, Ibai; Arzamendi, Dabit; De Potter, Tom; Freixa, Xavier; Camara, Oscar (Frontiers, 2019)

  According to clinical studies, around one third of patients with atrial fibrillation (AF) will suffer a stroke during their lifetime. Between 70 and 90% of these strokes are caused by thrombus formed in the left atrial ...
• Do you what I say? People reconstruct the syntax of anomalous utterances

  Ivanova, Iva; Branigan, Holly P.; McLean, Janet F.; Costa, Albert, 1970-; Pickering, Martin J. (Taylor & Francis, 2017)

  We frequently experience and successfully process anomalous utterances. Here we examine whether people do this by “correcting” syntactic anomalies to yield well-formed representations. In two structural priming experiments, ...

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