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Generalised Orthogonal Partial Directed Coherence as a Measure of Neural Information Flow During Meditation

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Advancements of Medical Electronics

Part of the book series: Lecture Notes in Bioengineering ((LNBE))

Abstract

Neural information flow in brain during meditation, can be addressed by brain connectivity studies. This work aims to obtain neural connectivity measures based on a strictly causal time varying Multi-Variate Auto-Regressive (MVAR) model, fitted to EEG signals obtained during meditation. The time varying Granger Causality based connectivity estimators as PDC (Partial Directed Coherence), g-PDC (generalized Partial Directed Coherence), OPDC (Orthogonalized Partial Directed Coherence) and g-OPDC (generalized Orthogonalized Partial Directed Coherence) are calculated using the adaptive autoregressive MVAR parameters. The MVAR model parameters have been estimated by Kalman Filter algorithm. In this work g-PDC and g-OPDC have been used to make the connectivity measures scale invariant. These connectivity estimators quantify the neural information flow between Electroencephalograph (EEG) channels. In addition g-OPDC is also immune to volume conduction artifact and gives better result compared to g-PDC. Finally, surrogate data statistics has been used to check the significance of the above connectivity estimators.

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Author information

Authors and Affiliations

  1. Silicon Institute of Technology, Bhubaneswar, India

    Laxmi Shaw

  2. Pune, India

    Subodh Mishra

  3. Indian Institute of Technology, Kharagpur, Kharagpur, India

    Aurobinda Routray

Authors
  1. Laxmi Shaw
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  2. Subodh Mishra
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  3. Aurobinda Routray
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Corresponding author

Correspondence to Laxmi Shaw .

Editor information

Editors and Affiliations

  1. Information Technology, JIS College of Engineering, Kalyani, West Bengal, India

    Somsubhra Gupta

  2. Biomedical Engineering, JIS College of Engineering, Kalyani, West Bengal, India

    Sandip Bag

  3. Biomedical Engineering, JIS College of Engineering, Kalyani, West Bengal, India

    Karabi Ganguly

  4. Electronics & Communication Engineering, JIS College of Engineering, Kalyani, West Bengal, India

    Indranath Sarkar

  5. Electrical Engineering, JIS College of Engineering, Kalyani, West Bengal, India

    Papun Biswas

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© 2015 Springer India

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Shaw, L., Mishra, S., Routray, A. (2015). Generalised Orthogonal Partial Directed Coherence as a Measure of Neural Information Flow During Meditation. In: Gupta, S., Bag, S., Ganguly, K., Sarkar, I., Biswas, P. (eds) Advancements of Medical Electronics. Lecture Notes in Bioengineering. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2256-9_13

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  • DOI: https://doi.org/10.1007/978-81-322-2256-9_13

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  • Publisher Name: Springer, New Delhi

  • Print ISBN: 978-81-322-2255-2

  • Online ISBN: 978-81-322-2256-9

  • eBook Packages: EngineeringEngineering (R0)

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