Research Interests: Neuroimaging, Neural oscillations, Biomedical signal processing, Causality

Projects: Brain Oscillatory Analysis of Short Term Auditory and Visual False Memories (Tübitak 3501)

Courses: Brain Dynamics and Oscillations; Methodology and Philosophy of Neuroscience;
Neural Networks for Biomedical Applications; Biological Signal Analysis;  Bio-inspired and Classical Optimization

Genel yazılar ve sunumlar:

• Günümüz nörobiliminin epistemolojik limitleri
  
  
• Beyin osilasyonlarının diyalektiği
  
  
• Beyinde karmaşık bir süreç olarak mizah ve gülme
  
  
• Zihin-beyin özdeşliği sorunsalı
  
  
• Zihin-beyin özdeşliği sorunsalı (video)
  
  
• Gerçekliği doğruya ne kadar yakın duyumsarız? (video)
  
  
• Nörobilimler bilincin zor problemini çözebilir mi? (video)
  
  
• Nedensellik ve Beyin (video)
  
  
• Beyinde ilintisel ve nedensel ilişkiler (video)
  
  
• Neural oscillations, circular causality and the implications for nature
  
  
• The problems of neurocentricism
  
  
• What are we measuring with MEG and EEG?

Recommendation Letter Policy

CV (pdf formatted)

Google Scholar profile

Publications

Journal:

• T.E. Özkurt, “Revisiting the earliest hyperscanning study: power and functional connectivity in the alpha band may link brains far apart”, Frontiers in Human Neuroscience, vol. 18, 2024. https://doi.org/10.3389/fnhum.2024.1476944
  
  
• T.E. Özkurt, “Abnormally low sensorimotor alpha band nonlinearity serves as an effective EEG biomarker of Parkinson’s Disease”, Journal of Neurophysiology, 2024. https://doi.org/10.1152/jn.00272.2023 (pdf & Matlab code)
  
  
• A. Oswal, B. Abdi-Sargezeh, A. Sharma, T.E. Özkurt, S. Taulu, N. Sarangmat, A.L Green, V. Litvak, “Spatiotemporal signal space separation for regions of interest: Application for extracting neuromagnetic responses evoked by deep brain stimulation”, Human Brain Mapping, 45(2), e26602, 2024. https://doi.org/10.1002/hbm.26602
  
  
• R. Yahyaei, T.E. Özkurt, "Mean curve length: An efficient feature for brainwave biometrics", Biomedical Signal Processing and Control, 2022. https://doi.org/10.1016/j.bspc.2022.103664 (pdf)
  
  
• T.E. Özkurt, "A Basic Nietzschean Model in Lieu of the Causal Maxim", Philosophia, https://doi.org/10.1007/s11406-021-00430-7, 2021.

• T.E. Özkurt, H. Akram, L. Zrinzo, P. Limousin, T. Foltynie, A. Oswal, V. Litvak, "Identification of nonlinear features in cortical and subcortical signals of Parkinson's disease patients", Neuroimage, 2020.
  
  
• H. Duzcu, T.E. Özkurt, I. Mapelli, A. Hohenberger, "N1 - P2: Neural markers of temporal expectation and response discrimination in interval timing", Acta Neurobiologiae Experimentali, vol. 79, 193-204, 2019.
  
  
• I. Mapelli, T.E. Özkurt, "Brain oscillatory correlates of visual short-term memory errors", Frontiers in Human Neuroscience, vol. 13 (33), 2019.
  
  
• O. Abbasi, J. Hirschmann, Storzer L., T.E. Özkurt, S. Elben, J. Vesper, L. Wojtecki, G. Schmitz, A. Schnitzler, M. Butz, "Unilateral deep brain stimulation suppresses alpha and beta oscillations in sensorimotor cortices", Neuroimage, vol. 174, pp. 201-207, 2018.
  
  
• N. Melnik, I. Mapelli, T. E. Özkurt, "Modulation of alpha oscillations is required for the suppression of semantic interference", Neurobiology of Learning and Memory, vol. 144, pp. 11-18, 2017.
  
  
• T. E. Özkurt, "Estimation of nonlinear neural source interactions via sliced bicoherence", Biomedical Signal Processing and Control, vol. 30, pp. 43-52, 2016. 

• J. Hirschmann, M. Butz, C. J. Hartmann, N. Hoogenboom, T. E. Özkurt, J. Vesper, L. Wojtecki, A. Schnitzler, "Parkinsonian rest tremor is associated with modulations of subthalamic high-frequency oscillations", Movement Disorders, vol. 31(10), pp. 1551-1559, 2016.
  
  
• J. Hirschmann, C. J. Hartmann, M. Butz, N. Hoogenboom, T. E. Özkurt, S. Elben, J. Vesper, L. Wojtecki, A. Schnitzler, "A direct relationship between oscillatory subthalamic nucleus-cortex coupling and rest tremor in Parkinson's disease", Brain, vol. 136(12), pp. 3659-3670, 2013.
  
  
• J. Hirschmann, T. E. Özkurt, M. Butz, M. Homburger, S. Elben, C. J. Hartmann, J. Vesper, L. Wojtecki, A. Schnitzler, "Differential modulation of STN-cortical and cortico-muscular coherence by movement and levodopa in Parkinson's disease", Neuroimage, vol. 68, pp. 203-213, 2013.
  
  
• T. E. Özkurt, "Statistically reliable and fast direct estimation of phase-amplitude cross-frequency coupling", IEEE Transactions on Biomedical Engineering, vol. 59. no. 7, pp. 1943-1950, 2012.
  
  
• T. E. Özkurt, A. Schnitzler, “A critical note on the definition of phase-amplitude cross-frequency coupling“, Journal of Neuroscience Methods, vol. 201, no. 2, pp. 438-443, 2011.

• T. E. Özkurt, M. Butz, M. Homburger, S. Elben, J. Vesper, L. Wojtecki, A. Schnitzler, "High frequency oscillations in the subthalamic nucleus: A neurophysiological marker of the motor state in Parkinson's disease", Experimental Neurology, vol. 229, no. 2, pp. 324-331, 2011.
  
  
• J. Hirschmann, T. E. Özkurt, M. Butz, M. Homburger, S. Elben, C. J. Hartmann, J. Vesper, L. Wojtecki, A. Schnitzler, “Distinct oscillatory STN-cortical loops revealed by simultaneous MEG and local field potential recordings in patients with Parkinson's disease”, Neuroimage, vol. 55, no. 3, pp. 1159-1168, 2011.
  
  
• T. E. Özkurt, M. Sun, W. Jia, R. Sclabassi, ”Spatial filtering of MEG signals for user-specified spherical regions”, IEEE Transactions on Biomedical Engineering, vol. 56, no. 10, pp. 2429-2438, 2009.
  
  
• T. E. Özkurt, M. Sun, R. Sclabassi, "Decomposition of magnetoencephalographic data into components corresponding to deep and superficial sources ", IEEE Transactions on Biomedical Engineering, vol. 55, no. 6,  pp. 1716-1727, 2008.

Book Chapter:

• T. E. Özkurt, M. Sun, R. Sclabassi, “Modified Beamspace Method for the Spatial Filtering of Magnetoencephalographic Data”, edited by: Nilmini Wickramasinghe, Illinois Institute of Technology, USA; Eliezer Geisler, Illinois Institute of Technology, USA, Encyclopedia of Healthcare Information Systems, IGI Publishing, July 2008.

International Conferences (full papers):

• E. K. Özay, T. E. Özkurt, “Efficient and Accurate Neural Fingerprints Obtained via Mean Curve Length of High Dimensional Model Representation of EEG Signals”, Proc. European Signal Processing Conference (EUSIPCO), Helsinki, Finland, September 4-8, 2023.

• A. L. Kandemir, T. E. Özkurt, "On the Most Informative Slice of Bicoherence that Characterizes Resting State Brain Activity", Proc. European Signal Processing Conference (EUSIPCO), Rome, Italy, September 3-7, 2018.
  
  
• T. E. Özkurt, M. Butz, J. Hirschmann, A. Schnitzler, "Adaptive Identification of Oscillatory Bands from Subcortical Neural Data", Proc. European Signal Processing Conference (EUSIPCO), Nice, France, pp. 2586-2590, August 31 - September 4, 2015.

• E. Y. Kanal, M. Sun, T. E. Özkurt, W. Jia, R. Sclabassi, “Magnetoencephalographic Imaging of Deep Corticostriatal Network Activity During a Rewards Paradigm”, Proc. International Conference of the IEEE Engineering in Medicine and Biology Society, Minneapolis, MN, pp. 2915-2918, September 3-6, 2009.

• E. Y. Kanal, T. E. Özkurt, R. Sclabassi, M. Sun, “Detecting Granger causality in the corticostriatal learning and rewards network using MEG”, Proc.  IEEE 35th Annual Northeast Biomedical Conference, Boston, USA, April 3-5, 2009.
  
  
• T. E. Özkurt, M. Sun, R. Sclabassi, “Spatial Filtering of MEG Signals for Spherical Regions in the Source Space”, Proc. IEEE 34th Annual Northeast Biomedical Conference, Providence, Rhodes Island, USA, April 4-6, 2008.
  
  
• U. Ulug, T. E. Özkurt, T. Akgül, “Bispectrum Mel-frequency Cepstrum Coefficients for Robust Speaker Identification”, Proc. Nonlinear Speech Processing (NOLISP) Workshop, Paris, France, May 22-25, 2007.
  
  
• T. E. Özkurt, M. Sun, R. Sclabassi, “Decomposition of MEG Signals with Sparse Representations”, Proc. IEEE 33rd Annual Northeast Biomedical Conference, Long Island, New York, USA, March 10-11, 2007.
  
  
• T. E. Özkurt, M. Sun, R. Sclabassi, “Beamspace Magnetoencephalographic Signal Decomposition in Spherical Harmonics Domain”, Proc. International Conference of the IEEE Engineering in Medicine and Biology Society, New York, USA, August 30 - September 3, 2006.
  
  
• T. E. Özkurt, M. Sun, T. Akgül, R. Sclabassi, “Optimal Feature Selection for Seizure Detection: A Subspace Based Approach” , Proc. International Conference of the IEEE Engineering in Medicine and Biology Society, New York, USA, August 30 - September 3, 2006.
  
  
• T. E.Özkurt, T. Akgül, S. Baykut, “Principal Component Analysis of the Fractional Brownian Motion for 0 < H < 0.5”, Proc. IEEE ICASSP 2006, Toulosse, France, May 14-19, 2006.
  
  
• J. Wenyan, R. Sclabassi, E. Kanal, T. E. Özkurt, M. Scheuer, M. Sun, "An intelligent userinterface system for diagnosis of epilepsy", Proc. IEEE 32nd Annual Northeast Biomedical Conference, Easton, PA, USA, April 01-02, 2006.
  
  
• T. E. Özkurt, T. Akgül, “Is PCA Reliable for The Analysis of Fractional Brownian Motion?”, Proc. European Signal Processing Conference (EUSIPCO), Antalya, Turkey, 2005.
  
  
• S. Baykut, T. E. Özkurt, M. Erol, T. Akgül, “The Influence of a Single Tone Sinusoid over Hurst Estimators”, Proc. European Signal Processing Conference (EUSIPCO), Antalya, Turkey, 2005.
  
  
• T. E. Özkurt, T. Akgül, ”Analysis of 1/f Nature of Sea-Wave Noise Data”, Proc. 3rd WSEAS Int. Conf. on Signal Processing, Computational Geometry & Artificial Vision (ISCGAV), Rhodes Island, Greece, 2003.

National Conferences (Turkish):

• E. Çağlayan, T. E. Özkurt, "Spectral features of heart rate variability obtained from a video camera",Proc. 23rd IEEE Signal Processing and Communication Applications Conference (SIU 2015), Malatya, Turkey, 2015.
  
  
• I. Mapelli, T. E. Özkurt, "Classification of living and non-living objects from MEG recordings", Proc. 21st IEEE Signal Processing and Communication Applications Conference (SIU 2013), Northern Cyprus, 2013.
  
  
• T. E. Özkurt, M. Butz, A. Schnitzler, “Adaptive Determination of Brain Oscillatory Activity”, Proc. 20th IEEE Signal Processing and Communication Applications Conference (SIU 2012), Mugla, Turkey, 2012.
  
  
• T. E. Özkurt, T. Akgül, “Cross-frequency Coupling Behavior of Underwater Data”, Proc. 20th IEEE Signal Processing and Communication Applications Conference (SIU 2012), Mugla, Turkey, 2012.
  
  
• S. Baykut, M. Erol, T. E. Özkurt, T. Akgül, “A Comparative Study on the Estimation of Hurst Parameter of Fractional Brownian Motion”, Proc. 13th IEEE Signal Processing and Communication Applications Conference (SIU 2005), Kayseri, Turkey, 2005.
  
  
• T. E. Özkurt, T. Akgül, “Robust Text-Independent Speaker Identification Using Bispectrum Slice”, Proc. 12th IEEE Signal Processing and Communication Applications Conference (SIU 2004), Kusadasi, Aydin, Turkey, pp. 418-421, 2004.
  
  
• T. E. Özkurt, N. S. Şengör, ”Time Series Predicting by Radial Basis Functions Neural Networks”, Proc. 11th IEEE Signal Processing and Communication Applications Conference (SIU 2003), Sariyer, Istanbul, Turkey, pp. 664-668, 2003.

International Abstracts:

• A. Oswal, S. Taulu, R. Seymour, P. Brown, T. E. Özkurt, V. Litvak, “Spatio-temporal signal separation approaches for artefact suppression and source leakage correction”, Live MEEG, October 5-9, 2020.
  
  
• T. E. Özkurt, "The problems of neurocentrism", 19th International Symposium on Disordered Systems, Istanbul, Turkey, November 15-17, 2019.
  
  
• T. E. Özkurt, "Neural oscillations, circular causality and the implications for nature", Causality in Neuro- and Psychological Sciences, Antwerp, Belgium, September 19-21, 2018.
  
  
• T. E. Özkurt, J. Hirschmann, M. Butz, A. Schnitzler, "Sliced cross-channel bicoherence between local field potentials for patients with Parkinson’s disease", Coupling and Causality in Complex Systems, Cologne, Germany, September 25-27, 2017.
  
  
• V. A. Özkan, T. E. Özkurt, "Modeling deep brain stimulation effects on amplitude and coupling behavior of beta and high-frequency oscillations", Coupling and Causality in Complex Systems, Cologne, Germany, September 25-27, 2017.
  
  
• G. Göktepe, I. Mapelli, T. E. Özkurt, "Would somatosensory stimuli increase LTM performance? A preliminary EEG study", International Conference for Cognitive Neuroscience, Amsterdam, Netherlands, August 5-8, 2017.
  
  
• I. Mapelli, T. E. Özkurt, "Alpha synchronization between occipital and frontal regions distinguishes errors in a visual working memory task”, BIOMAG 2016 - 20th International Conference on Biomagnetism, October 1-6, Seul, Korea, 2016.
  
  
• O. Abbasi, J. Hirschmann, L. Storzer, T. E. Özkurt, S. Elben, J. Vesper, L. Wojtecki, G. Schmitz, A. Schnitzler, M. Butz, "Deep Brain Stimulation Both at 130 Hz and 340 Hz Suppresses Cortical Alpha and Beta Band Activity", Human Brain Mapping Annual Meeting, June 26-30, Geneva, Switzerland, 2016.
  
  
• J. Hirschmann, M. Butz, C. J. Hartmann, N. Hoogenboom, T. E. Özkurt, J. Vesper, L. Wojtecki, A. Schnitzler, "DBS electrode recordings reveal distinct changes of STN high frequency oscillations during parkinsonian rest tremor",  19th NANS Annual Meeting, December 10-14, Las Vegas, NV, 2015.  
  
  
• I. Mapelli, N. Melnik, T. E. Özkurt, "Alpha Activity in the Posterior Regions Distinguishes Visual False Memories and Other Memory Errors", Human Brain Mapping Annual Meeting, Honolulu, Hawaii, USA, 2015.
  
  
• N. Melnik, I. Mapelli, T. E. Özkurt, "Alpha activity reflects semantic interference resolution in an auditory working memory task", Human Brain Mapping Annual Meeting, Honolulu, Hawaii, USA, 2015.
  
  
• I. Mapelli, S. Özer, T. E. Özkurt, “Brain oscillatory analysis of gist-based short-term false memory for visual stimuli: a preliminary study”, 1st Joint Turkish-German Symposium on Human Neuroscience, Berlin, Germany, 2014.


• I. Mapelli, T. E. Özkurt, "A Feature Extraction and Selection Procedure for an Efficient Classification of MEG Recordings", Frontiers Neuroinformatics Conference, Stockholm, Sweden,  August  27-29, 2013.
  
  
• T. E. Özkurt, I. Mapelli, A. Schnitzler, “Efficient estimation of cross-frequency coupling from Parkinson’s disease recordings”, BIOMAG 2012 - 18th International Conference on Biomagnetism, Paris, France, August 26-30, 2012.
  
  
• M. Butz, T. E. Özkurt, J. Hirschmann, S. Elben, M. Homburger, C. J. Vesper, L. Wojtecki, A. Schnitzler, “Simultaneous MEG-LFP recordings in PD patients treated with DBS”, Aarhus MEG Workshop, Denmark, 2012.
  
  
• T. E. Özkurt, M. Butz, M. Homburger, S. Elben, C. J. Vesper, L. Wojtecki, A. Schnitzler,"High frequency oscillations in the subthalamic nucleus: A neurophysiological marker of the motor state in Parkinson’s disease”, 15th International Conference on Parkinson’s Disease and Movement Disorders, Toronto, Canada, 2011.
  
  
• T. E. Özkurt, M. Butz, A. Schnitzler, "Identifying Oscillatory Activity in Parkinson’s Disease LFP and MEG Data by Adaptive Decomposition", Human Brain Mapping Annual Meeting, Quebec City, Canada, 2011.
  
  
• M. Butz, T. E. Özkurt, M. Homburger, S. Elben, C. J. Vesper, L. Wojtecki, A. Schnitzler,"“High Frequency Oscillations - a Neurophysiological Marker of the Motor State in Parkinson’s Disease”, Human Brain Mapping Annual Meeting, Quebec City, Canada, 2011.
  
  
• E. Y. Kanal, T. E. Özkurt, M. Sun, R. Sclabassi, ”MEG imaging of prefrontal and striatal activity during a gambling task”, Neuroscience Meeting Planner, Washington, DC, Society for Neuroscience, 2008.