Browsing by Author "Sitaram, Ranganatha"
Now showing 1 - 20 of 25
Results Per Page
Sort Options
- ItemA subject-independent pattern-based Brain-Computer Interface(2015) Ray, Andreas M.; Sitaram, Ranganatha; Rana, Mohit; Pasqualotto, Emanuele; Buyukturkoglu, Korhan; Guan, Cuntai; Ang, Kai-Keng; Tejos Núñez, Cristián Andrés; Zamorano, Francisco; Ruiz Poblete, Sergio Marcelo; Birbaumer, Niels; Aboitiz, Francisco
- ItemAbnormal Neural Connectivity in Schizophrenia and fMRI-Brain-Computer Interface as a Potential Therapeutic Approach(2013) Ruiz, S.; Birbaumer, N.; Sitaram, RanganathaConsidering that single locations of structural and functional abnormalities are insufficient to explain the diverse psychopathology of schizophrenia, new models have postulated that the impairments associated with the disease arise from a failure to integrate the activity of local and distributed neural circuits: the “abnormal neural connectivity hypothesis.” In the last years, new evidence coming from neuroimaging have supported and expanded this theory. However, despite the increasing evidence that schizophrenia is a disorder of neural connectivity, so far there are no treatments that have shown to produce a significant change in brain connectivity, or that have been specifically designed to alleviate this problem. Brain-Computer Interfaces based on real-time functional Magnetic Resonance Imaging (fMRI-BCI) are novel techniques that have allowed subjects to achieve self-regulation of circumscribed brain regions. In recent studies, experiments with this technology have resulted in new findings suggesting that this methodology could be used to train subjects to enhance brain connectivity, and therefore could potentially be used as a therapeutic tool in mental disorders including schizophrenia. The present article summarizes the findings coming from hemodynamics-based neuroimaging that support the abnormal connectivity hypothesis in schizophrenia, and discusses a new approach that could address this problem.
- ItemAcquired self-control of insula cortex modulates emotion recognition and brain network connectivity in schizophrenia(2013) Ruiz Poblete, Sergio Marcelo; Lee, Sangkyun; Soekadar, Surjo R.; Caria, Andrea; Veit, Ralf; Kircher, Tilo; Birbaumer, Niels; Sitaram, Ranganatha
- ItemClosed-loop brain training : the science of neurofeedback(2017) Sitaram, Ranganatha; Ros, Tomas; Stoeckel, Luke; Haller, Sven; Scharnowski, Frank
- ItemConsensus on the reporting and experimental design of clinical and cognitive-behavioural neurofeedback studies (CRED-nf checklist)(2020) Ros, T.; Enriquez Geppert, S.; Zotev, V.; Young, K. D.; Wood, G.; Whitfield-Gabrieli, S.; Wan, F.; Vuilleumier, P.; Vialatte, F.; Sitaram, Ranganatha; Van de Ville, D.; Todder, D.; Surmeli, T.; Sulzer, J. S.; Strehl, U.; Sterman, M. B.; Steiner, N. J.; Sorger, B.; Soekadar, S. R.; Sherlin, L. H.; Schonenberg, M.; Scharnowski, F.; Schabus, M.; Rubia, K.; Rosa, A.; Reinel Pineda, Mahaira Catalina; Pineda, J. A.; Paret, C.; Ossadtchi, A.; Nicholson, A. A.; Nan, W. Y.; Minguez, J.; Micoulaud-Franchi, J. A.; Mehler, D. M. A.; Luhrs, M.; Lubar, J.; Lotte, F.; Linden, D. E. J.; Lewis-Peacock, J. A.; Lebedev, M. A.; Lanius, R. A.; Kubler, A.; Kranczioch, C.; Koush, Y.; Konicar, L.; Kohl, S. H.; Kober, S. E.; Klados, M. A.; Jeunet, C.; Janssen, T. W. P; Huster, R. J.; Hoedlmoser, K.; Hirshberg, L. M.; Heunis, S.
- ItemDetection of electrophysiological patterns of declarative memory reactivations during sleep(2021) Sánchez Corzo, Andrea del Pilar; Sitaram, Ranganatha; Pontificia Universidad Católica de Chile. Escuela de Medicina
- ItemDifferential frontal alpha oscillations and mechanisms underlying loss of consciousness : a comparison between slow and fast propofol infusion rates(2020) Sepúlveda, P.; Cortinez, L. I.; Irani, M.; Egaña, J. I.; Contreras, V.; Sánchez Corzo, A.; Acosta, I.; Sitaram, Ranganatha
- ItemEditorial : Learned Brain Self-Regulation for Emotional Processing and Attentional Modulation : From Theory to Clinical Applications(2016) Ruiz Poblete, Sergio Marcelo; Birbaumer, N.; Sitaram, Ranganatha
- ItemEnsemble Classification of Alzheimer's Disease and Mild Cognitive Impairment Based on Complex Graph Measures from Diffusion Tensor Images(2017) Ebadi, A.; Da Rocha, J.; Nagaraju, D.; Tovar, F.; Bramati, I.; Coutinho, G.; Sitaram, Ranganatha; Rashidi, P.
- ItemFunctional Connectivity of Language Regions of Stroke Patients with Expressive Aphasia During Real-Time Functional Magnetic Resonance Imaging Based Neurofeedback(2019) Sreedharan, S.; Arun, K.M.; Sylaja, P.N.; Kesavadas, C.; Sitaram, Ranganatha
- ItemHow feedback, motor imagery, and reward influence brain self‐regulation using real‐time fMRI(2016) Sepulveda, P.; Sitaram, Ranganatha; Rana, M.; Montalba, C.; Tejos Núñez, Cristián Andrés; Ruiz Poblete, Sergio Marcelo
- ItemImproving Motor Corticothalamic Communication After Stroke Using Real-Time fMRI. Connectivity-Based Neurofeedback(2016) Liew, S.; Rana, M.; Cornelsen, S.; De Barros, M.; Birbaumer, N.; Sitaram, Ranganatha; Cohen, L.; Soekadar, S.
- ItemInvolvement of top-down networks in the perception of facial emotions : A magnetoencephalographic investigation(2020) Kajal, D. S.; Fioravanti, C.; Elshahabi, A.; Ruíz Poblete, Sergio Marcelo; Sitaram, Ranganatha; Braun, C.
- ItemLearned Control of Inter-Hemispheric Connectivity: Effects on Bimanual Motor Performance(2017) Kajal, D.; Braun, C.; Mellinger, J.; Sacchet, M.; Ruiz Poblete, Sergio Marcelo; Fetz, E.; Birbaumer, N.; Sitaram, Ranganatha
- ItemMultilevel diffusion tensor imaging classification technique for characterizing neurobehavioral disorders(2020) da Rocha, J. L. D.; Coutinho, G.; Bramati, I.; Moll, F. T.; Sitaram, Ranganatha
- ItemReal-time fMRI brain computer interfaces : Self-regulation of single brain regions to networks(2014) Ruiz Poblete, Sergio Marcelo; Buyukturkoglu, Korhan; Rana, Mohit; Birbaumer, Niels; Sitaram, Ranganatha
- ItemReal-time fMRI neurofeedback training as a neurorehabilitation approach on depressive disorders : a systematic review of randomized control trials(2021) González Méndez, Pamela Patricia; Sitaram, Ranganatha; Pontificia Universidad Católica de Chile. Escuela de MedicinaQuestion: Real-time functional magnetic resonance imaging neurofeedback (rt-fMRI-nf) training is an emerging intervention with potential to neurorehabilitation. We aim to evaluate the evidence of randomized control trials on the clinical application of rt-fMRI-nf training on participants with clinical depression. Study selection and analysis: We searched in Pubmed, Embase, CENTRAL, rtFIN database, Epistemonikos, trial registers, reference lists, other systematic reviews, conference abstracts, and cross-citation in Google Scholar. Two reviewers independently selected studies, extracted data and assessed the risk of bias. The certainty of the evidence was judged using the GRADE recommendations, a Summary of Findings table is presented. This review complies with PRISMA guidelines and was submitted to PROSPERO registration. Findings: 435 results. After selection process, we included 11 reports corresponding to 4 RCTs. The effect of rtfMRI-nf on improving severity of depression clinical scores showed tendency to favors intervention; however the overall effect was not significant. At end of treatment, SMD(standardized mean difference): -0.32 (95%CI -0.73 to 0.10). At follow-up, SMD: -0.33 (95%CI -0.91, 1.25). All the studies demonstrated changes in BOLD fMRI activation after training; however, only one study demonstrated regulation success during a transfer run. Wholebrain analyses suggests that rt-fMRI nf alters activity patterns not only in a single brain region, but brain networks. More studies are needed to provide an estimated effect on quality of life, acceptability, adverse effects, cognitive tasks, and physiology measures. Conclusions: The current evidence of RCTs about the impact of rt-fMRI-nf training for decision-making outcomes in patients with clinical depression is still insufficient
- ItemReal-Time Subject-Independent Pattern Classification of Overt and Covert Movements from fNIRS. Signals(2016) Robinson, Neethu; Zaidi, Ali Danish; Rana, Mohit; Prasad, Vinod A.; Guan, Cuntai; Birbaumer, Niels; Sitaram, Ranganatha
- ItemSelf-regulation of anterior insula with real-time fMRI and its behavioral effects in obsessive-compulsive disorder : a feasibility study(2015) Buyukturkoglu, Korhan; Roettgers, Hans Sommer; Jens, Rana; Mohit, Dietzsch; Leonie, Arikan; Ezgi Belkis; Veit, Ralf; Malekshahi, Rahim; Kircher, Tilo; Ruiz, Sergio; Sitaram, Ranganatha; Birbaumer, Niels
- ItemSelf-Regulation of the Fusiform Face Area in Autism Spectrum: A Feasibility Study With Real-Time fMRI Neurofeedback(2019) Pereira Quezada, Jaime Andrés; Sepúlveda, P; Rana, M.; Montalba, C.; Tejos Núñez, Cristián Andrés; Torres Barrenechea, Rafael; Sitaram, Ranganatha; Ruiz Poblete, Sergio Marcelo