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- Pedro A. Valdes-Sosa, J. M. Sanchez-Bornot, +5 authors Tohru Ozaki
- Human brain mapping
- 2009

This article reviews progress and challenges in model driven EEG/fMRI fusion with a focus on brain oscillations. Fusion is the combination of both imaging modalities based on a cascade of forward models from ensemble of post-synaptic potentials (ePSP) to net primary current densities (nPCD) to EEG; and from ePSP to vasomotor feed forward signal (VFFSS) to… (More)

- Jorge J. Riera, Jobu Watanabe, +4 authors Ryuta Kawashima
- NeuroImage
- 2004

In this paper, a new procedure is presented which allows the estimation of the states and parameters of the hemodynamic approach from blood oxygenation level dependent (BOLD) responses. The proposed method constitutes an alternative to the recently proposed Friston [Neuroimage 16 (2002) 513] method and has some advantages over it. The procedure is based on… (More)

- Isao Shoji, Tohru Ozaki
- 1998

This paper proposes a new local linearization method which approximates a nonlinear stochastic differential equation by a linear stochastic differential equation. Using this method, we can estimate parameters of the nonlinear stochastic differential equation from discrete observations by the maximum likelihood technique. We conduct the numerical experiments… (More)

- Andreas Galka, Okito Yamashita, Tohru Ozaki, Rolando J. Biscay, Pedro A. Valdes-Sosa
- NeuroImage
- 2004

We present a new approach for estimating solutions of the dynamical inverse problem of EEG generation. In contrast to previous approaches, we reinterpret this problem as a filtering problem in a state space framework; for the purpose of its solution, we propose a new extension of Kalman filtering to the case of spatiotemporal dynamics. The temporal… (More)

- Okito Yamashita, Andreas Galka, Tohru Ozaki, Rolando J. Biscay, Pedro A. Valdes-Sosa
- Human brain mapping
- 2004

In the dynamical inverse problem of electroencephalogram (EEG) generation where a specific dynamics for the electrical current distribution is assumed, we can impose general spatiotemporal constraints onto the solution by casting the problem into a state space representation and assuming a specific class of parametric models for the dynamics. The Akaike… (More)

- Okito Yamashita, Norihiro Sadato, Tomohisa Okada, Tohru Ozaki
- NeuroImage
- 2005

In this article, we propose a statistical method to evaluate directed interactions of functional magnetic-resonance imaging (fMRI) data. The multivariate autoregressive (MAR) model was combined with the relative power contribution (RPC) in this analysis. The MAR model was fitted to the data to specify the direction of connections, and the RPC quantifies the… (More)

- Matthew J. Barton, Peter A. Robinson, +4 authors Tohru Ozaki
- IEEE Trans. Biomed. Engineering
- 2009

Electroencephalographic (EEG) source localization is an important tool for noninvasive study of brain dynamics, due to its ability to probe neural activity more directly, with better temporal resolution than other imaging modalities. One promising technique for solving the EEG inverse problem is Kalman filtering, because it provides a natural framework for… (More)

- Hui Peng, Tohru Ozaki, Valerie Haggan-Ozaki, Yukihiro Toyoda
- IEEE Trans. Neural Networks
- 2003

This paper considers the nonlinear systems modeling problem for control. A structured nonlinear parameter optimization method (SNPOM) adapted to radial basis function (RBF) networks and an RBF network-style coefficients autoregressive model with exogenous variable model parameter estimation is presented. This is an off-line nonlinear model parameter… (More)

- Yohko Maki, Kin Foon Kevin Wong, Motoaki Sugiura, Tohru Ozaki, Norihiro Sadato
- NeuroImage
- 2008

Mirror-symmetrical bimanual movement is more stable than parallel bimanual movement. This is well established at the kinematic level. We used functional MRI (fMRI) to evaluate the neural substrates of the stability of mirror-symmetrical bimanual movement. Right-handed participants (n=17) rotated disks with their index fingers bimanually, both in… (More)

- Andrea D. Eckhart, Tohru Ozaki, Hendrik Tevaearai, Howard A . Rockman, W. Koch
- Molecular pharmacology
- 2002

Cardiovascular regulation is tightly controlled by signaling through G protein-coupled receptors (GPCRs). beta-Adrenergic receptors (ARs) are GPCRs that regulate inotropy and chronotropy in the heart and mediate vasodilation, which critically influences systemic vascular resistance. GPCR kinases (GRKs), including GRK2 (or betaARK1), phosphorylate and… (More)