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Kinoshita A, Takizawa R, Yahata N, Homae F, Hashimoto R, Sakakibara E, Kawasaki S, Nishimura Y, Koike S, Kasai K. Development of a neurofeedback protocol targeting the frontal pole using near-infrared spectroscopy. Psychiatry Clin Neurosci 2016; 70:507-516. [PMID: 27489230 DOI: 10.1111/pcn.12427] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 07/13/2016] [Accepted: 07/31/2016] [Indexed: 11/28/2022]
Abstract
AIM Neurofeedback has been studied with the aim of controlling cerebral activity. Near-infrared spectroscopy is a non-invasive neuroimaging technique used for measuring hemoglobin concentration changes in cortical surface areas with high temporal resolution. Thus, near-infrared spectroscopy may be useful for neurofeedback, which requires real-time feedback of repeated brain activation measurements. However, no study has specifically targeted neurofeedback, using near-infrared spectroscopy, in the frontal pole cortex. METHODS We developed an original near-infrared spectroscopy neurofeedback system targeting the frontal pole cortex. Over a single day of testing, each healthy participant (n = 24) received either correct or incorrect (Sham) feedback from near-infrared spectroscopy signals, based on a crossover design. RESULTS Under correct feedback conditions, significant activation was observed in the frontal pole cortex (P = 0.000073). Additionally, self-evaluation of control and metacognitive beliefs were associated with near-infrared spectroscopy signals (P = 0.006). CONCLUSION The neurofeedback system developed in this study might be useful for developing control of frontal pole cortex activation.
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Affiliation(s)
- Akihide Kinoshita
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, The University of Tokyo, Tokyo, Japan
| | - Ryu Takizawa
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, The University of Tokyo, Tokyo, Japan
| | - Noriaki Yahata
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, The University of Tokyo, Tokyo, Japan
| | - Fumitaka Homae
- Department of Language Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - Ryuichiro Hashimoto
- Department of Language Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - Eisuke Sakakibara
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, The University of Tokyo, Tokyo, Japan
| | - Shingo Kawasaki
- Healthcare Business Unit, Section 7, Product Solution Department, Hitachi, Ltd., Chiba, Japan
| | - Yukika Nishimura
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, The University of Tokyo, Tokyo, Japan
| | - Shinsuke Koike
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, The University of Tokyo, Tokyo, Japan.,University of Tokyo Institute for Diversity & Adaptation of Human Mind (UTIDAHM), The University of Tokyo, Tokyo, Japan.,Center for Evolutionary Cognitive Sciences, Graduate School of Art and Sciences, The University of Tokyo, Tokyo, Japan
| | - Kiyoto Kasai
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, The University of Tokyo, Tokyo, Japan
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Tabi CB, Bineli G, Mohamadou A. Energy patterns in twist-opening models of DNA with solvent interactions. J Biol Phys 2015; 41:391-408. [PMID: 26051121 PMCID: PMC4550623 DOI: 10.1007/s10867-015-9386-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Accepted: 04/23/2015] [Indexed: 11/28/2022] Open
Abstract
Energy localization, via modulation instability, is addressed in a modified twist-opening model of DNA with solvent interactions. The Fourier expansion method is used to reduce the complex roto-torsional equations of the system to a set of discrete coupled nonlinear Schrödinger equations, which are used to perform the analytical investigation of modulation instability. We find that the instability criterion is highly influenced by the solvent parameters. Direct numerical simulations, performed on the generic model, further confirm our analytical predictions, as solvent interactions bring about highly localized energy patterns. These patterns are also shown to be robust under thermal fluctuations.
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Affiliation(s)
- Conrad Bertrand Tabi
- Laboratory of Biophysics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon,
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Mvogo A, Ben-Bolie GH, Kofané TC. Energy transport in the three coupled α-polypeptide chains of collagen molecule with long-range interactions effect. CHAOS (WOODBURY, N.Y.) 2015; 25:063115. [PMID: 26117109 DOI: 10.1063/1.4922591] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The dynamics of three coupled α-polypeptide chains of a collagen molecule is investigated with the influence of power-law long-range exciton-exciton interactions. The continuum limit of the discrete equations reveal that the collagen dynamics is governed by a set of three coupled nonlinear Schrödinger equations, whose dispersive coefficient depends on the LRI parameter r. We construct the analytic symmetric and asymmetric (antisymmetric) soliton solutions, which match with the structural features of collagen related with the acupuncture channels. These solutions are used as initial conditions for the numerical simulations of the discrete equations, which reveal a coherent transport of energy in the molecule for r > 3. The results also indicate that the width of the solitons is a decreasing function of r, which help to stabilize the solitons propagating in the molecule. To confirm further the efficiency of energy transport in the molecule, the modulational instability of the system is performed and the numerical simulations show that the energy can flow from one polypeptide chain to another in the form of nonlinear waves.
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Affiliation(s)
- Alain Mvogo
- Laboratory of Biophysics, Department of Physics, University of Yaounde I, Yaounde, Cameroon
| | - G H Ben-Bolie
- Centre d'Excellence Africain en Technologies de l'Information et de la Communication, University of Yaounde I, Yaounde, Cameroon
| | - T C Kofané
- Centre d'Excellence Africain en Technologies de l'Information et de la Communication, University of Yaounde I, Yaounde, Cameroon
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Maïna I, Tabi CB, Ekobena Fouda HP, Mohamadou A, Kofané TC. Discrete impulses in ephaptically coupled nerve fibers. CHAOS (WOODBURY, N.Y.) 2015; 25:043118. [PMID: 25933666 DOI: 10.1063/1.4919077] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We exclusively analyze the condition for modulated waves to emerge in two ephaptically coupled nerve fibers. Through the multiple scale expansion, it is shown that a set of coupled cable-like Hodgkin-Huxley equations can be reduced to a single differential-difference nonlinear equation. The standard approach of linear stability analysis of a plane wave is used to predict regions of parameters where nonlinear structures can be observed. Instability features are shown to be importantly controlled not only by the ephaptic coupling parameter, but also by the discreteness parameter. Numerical simulations, to verify our analytical predictions, are performed, and we explore the longtime dynamics of slightly perturbed plane waves in the coupled nerve fibers. On initially exciting only one fiber, quasi-perfect interneuronal communication is discussed along with the possibility of recruiting damaged or non-myelinated nerve fibers, by myelinated ones, into conduction.
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Affiliation(s)
- I Maïna
- Laboratory of Biophysics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - C B Tabi
- Laboratory of Biophysics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - H P Ekobena Fouda
- Laboratory of Biophysics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
| | - A Mohamadou
- Department of Physics, Faculty of Science, University of Maroua, P. O. Box 814, Maroua, Cameroon
| | - T C Kofané
- Laboratory of Mechanics, Department of Physics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon
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