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File206 - Examination of brain coordination dynamics underlying hypnosis and volitional acts using intracranial electroencephalography2015-052017-06

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2014
Location: BF-GMS
Title:
2014 Grants
Start date: 2015-01

Reference code: PT/FB/BL-2014-206
Location: BF-GMS
Title:
206 - Examination of brain coordination dynamics underlying hypnosis and volitional acts using intracranial electroencephalography
Duration: 2015-05 - 2017-06
Researcher(s):
Jose Luis Perez Velazquez, Navinder Persaud, Taufik A. Valiante
Institution(s): Hospital for Sick Children, Neurology, Toronto (Canada); Toronto Western Hospital (Canada)
Contents: Contents:
Application form
Correspondence
Progress reports
Final report
Language: eng
Author:
Perez Velazquez, J. L.
Secondary author(s):
Persaud, N., Valiante, T. A.
Keywords:
Intracerebral recordings / Hypnosis / Volition / Brain coordination / Psychophysiology and Parapsychology

DocumentFinal report - Examination of brain coordination dynamics underlying hypnosis and volitional acts using intracranial electroencephalography2017

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2014
Location: BF-GMS
Title:
2014 Grants
Start date: 2015-01

Reference code: PT/FB/BL-2014-206
Location: BF-GMS
Title:
206 - Examination of brain coordination dynamics underlying hypnosis and volitional acts using intracranial electroencephalography
Duration: 2015-05 - 2017-06
Researcher(s):
Jose Luis Perez Velazquez, Navinder Persaud, Taufik A. Valiante
Institution(s): Hospital for Sick Children, Neurology, Toronto (Canada); Toronto Western Hospital (Canada)
Contents: Contents:
Application form
Correspondence
Progress reports
Final report
Language: eng
Author:
Perez Velazquez, J. L.
Secondary author(s):
Persaud, N., Valiante, T. A.
Keywords:
Intracerebral recordings / Hypnosis / Volition / Brain coordination / Psychophysiology and Parapsychology

Reference code: PT/FB/BL-2014-206.01
Location: BF-GMS
Title:
Final report - Examination of brain coordination dynamics underlying hypnosis and volitional acts using intracranial electroencephalography
Publication year: 2017
URL:
https://www.bial.com/imagem/Grant_20614.pdf
Abstract/Results: ABSTRACT:
Our main goals were to investigate the neurophysical mechanisms underlying hypnosis and to examine alterations in consciousness during hypnosis. A novelty of our project is that it investigates the neurophysiological mechanisms of hypnosis using intracranial electroencephalography (iEEG), as the majority of studies on this topic have used other non-invasive modalities. Based on the notion that the “connectivity” among brain regions is fundamental to understand how the brain manages to process information, we assess synchrony patterns and the complexity of those patterns.
A total of 18 patients participated in this study. Usable data were obtained from 11 of those patients. Hypnosis was induced and hypnotizability was assessed using a modified and extended version of the Stanford Hypnotic Susceptibility Scale. Continuous iEEG was recorded with an EEG software in the Epilepsy Unit of the Toronto Western Hospital. The hypnotic sessions were also video recorded.
On the dispute whether hypnosis is an altered state marked by a level of awareness associated with distinctive electrophysiological patterns, our preliminary results point towards a characterization of hypnosis as a state lacking an easily distinguishable pattern from other more “ordinary” mind states. The extensive network analysis here performed does not show a brain network pattern characteristic of the hypnotic condition. This result however may be affected by the limited sample (11 subjects) and the extremely challenging condition in which the practice of hypnosis was conducted in the patients at the Epilepsy Unit.
Accessibility: Document exists in file
Language:
eng
Author:
Perez Velazquez, J. L.
Secondary author(s):
Valiante, T., Persaud, N.
Document type:
Final report
Keywords:
Brain synchrony / Connectivity / Hypnosis

Final report - Examination of brain coordination dynamics underlying hypnosis and volitional acts using intracranial electroencephalography

Final report - Examination of brain coordination dynamics underlying hypnosis and volitional acts using intracranial electroencephalography

DocumentEyes closed or eyes open? Exploring the alpha desynchronization hypothesis in resting state functional connectivity networks with intracranial EEG2017

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2014
Location: BF-GMS
Title:
2014 Grants
Start date: 2015-01

Reference code: PT/FB/BL-2014-206
Location: BF-GMS
Title:
206 - Examination of brain coordination dynamics underlying hypnosis and volitional acts using intracranial electroencephalography
Duration: 2015-05 - 2017-06
Researcher(s):
Jose Luis Perez Velazquez, Navinder Persaud, Taufik A. Valiante
Institution(s): Hospital for Sick Children, Neurology, Toronto (Canada); Toronto Western Hospital (Canada)
Contents: Contents:
Application form
Correspondence
Progress reports
Final report
Language: eng
Author:
Perez Velazquez, J. L.
Secondary author(s):
Persaud, N., Valiante, T. A.
Keywords:
Intracerebral recordings / Hypnosis / Volition / Brain coordination / Psychophysiology and Parapsychology

Reference code: PT/FB/BL-2014-206.02
Location: BF-GMS
Title:
Eyes closed or eyes open? Exploring the alpha desynchronization hypothesis in resting state functional connectivity networks with intracranial EEG
Publication year: 2017
URL:
http://www.biorxiv.org/content/early/2017/03/18/118174
Abstract/Results: ABSTRACT:
This paper addresses a fundamental question, are eyes closed and eyes open resting states equivalent baseline conditions, or do they have consistently different electrophysiological signatures? We compare the functional connectivity patterns in an eyes closed resting state with an eyes open resting state, and show that functional connectivity in the alpha band decreases in the eyes open condition compared to eyes closed. This "alpha desynchronization" or reduction in the number of connections from eyes closed to eyes open, is here, for the first time, studied with intracranial recordings. We provide two calculations of the wiring cost, local and mesoscopic, defined in terms of the distance between the electrodes and the likelihood that they are functionally connected. We find that, in agreement with the "alpha desynchronization" hypothesis, the local wiring cost decreases going from eyes closed to eyes open. However, when the wiring cost calculation takes into account the connectivity pattern, the wiring cost variation from eyes closed to eyes open is not as consistent and shows regional specificity. The wiring cost measure defined here, provides a new avenue for understanding the electrophysiology of resting state.
Accessibility: Document exists in file
Language:
eng
Author:
Gomez Ramirez, J.
Secondary author(s):
Freedman, S., Mateos, D., Perez Velazquez, J. L., Valiante, T.
Document type:
Online paper
Reference:
Gomez Ramirez, J., Freedman, S., Mateos, D., Perez Velazquez, J. P., & Valiante, T. (2017). Eyes closed or eyes open? Exploring the alpha desynchronization hypothesis in resting state functional connectivity networks with intracranial EEG. BioRxiv. doi: https://doi.org/10.1101/118174
Indexed document: No
Keywords: Brain synchrony / Connectivity / Hypnosis

Eyes closed or eyes open? Exploring the alpha desynchronization hypothesis in resting state functional connectivity networks with intracranial EEG

Eyes closed or eyes open? Exploring the alpha desynchronization hypothesis in resting state functional connectivity networks with intracranial EEG

DocumentThe hypnotized brain: an examination of the iEEG correlates of neutral hypnosis2016

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2014
Location: BF-GMS
Title:
2014 Grants
Start date: 2015-01

Reference code: PT/FB/BL-2014-206
Location: BF-GMS
Title:
206 - Examination of brain coordination dynamics underlying hypnosis and volitional acts using intracranial electroencephalography
Duration: 2015-05 - 2017-06
Researcher(s):
Jose Luis Perez Velazquez, Navinder Persaud, Taufik A. Valiante
Institution(s): Hospital for Sick Children, Neurology, Toronto (Canada); Toronto Western Hospital (Canada)
Contents: Contents:
Application form
Correspondence
Progress reports
Final report
Language: eng
Author:
Perez Velazquez, J. L.
Secondary author(s):
Persaud, N., Valiante, T. A.
Keywords:
Intracerebral recordings / Hypnosis / Volition / Brain coordination / Psychophysiology and Parapsychology

Reference code: PT/FB/BL-2014-206.03
Location: BF-GMS
Title:
The hypnotized brain: an examination of the iEEG correlates of neutral hypnosis
Publication year: 2016
URL:
http://can-acn.org/documents/2016/AbstractBook2016.pdf
Abstract/Results: ABSTRACT:
This research investigates the neurophysiological mechanisms of hypnosis using intracranial electroencephalography. This methodology removes resolution problems associated with functional imaging. Patients with intractable epilepsy, and implanted as part of their diagnostic exam, were hypnotized. Neutral hypnosis was measured following a standard induction procedure, and before the administration of hypnotic suggestions. Patients with high and low hypnotizability were tested and compared. Phase based synchronization for connectivity analysis was calculated for three different conditions: prehypnotic state (eyes open and closed), neutral hypnosis (eyes closed) and posthypnotic state (eyes open and closed), across multiple frequency bands. The intersite phase clustering difference between all the intracranial electrodes across delta, theta, alpha, beta and gamma frequencies, was computed for all conditions. In high hypnotizable patients with bi-temporal burr holes, we found more intersite synchronization, for theta and alpha bands, in the hypnotic condition than in the eyes closed conditions, and a more modular organization (more partitionable) in both the hypnotic and the eyes closed conditions, compared to the eyes open conditions. Phase synchronization distribution distance for all bands between hypnotic and posthypnotic states was shorter in high than in low hypnotizable patients. Our results suggest that hypnosis represents a genuine brain state whose distinctiveness from states of deep relaxation is in need of clarification.
Accessibility: Document exists in file
Language:
eng
Author:
Freedman, S.
Secondary author(s):
Mateos, D., Perez Velazquez, J. L., Valiante, T., Gomez Ramirez, J.
Document type:
Abstract book
Reference:
Freedman, S., Mateos, D., Perez Velazquez, J. L., Valiante, T., & Gomez Ramirez, J. (2016). The hypnotized brain: an examination of the iEEG correlates of neutral hypnosis. Abstract book of the 10th Annual Canadian Neuroscience Meeting. Toronto, Ontario
Indexed document: No
Keywords: Hypnosis / Brain synchrony / Connectivity

The hypnotized brain: an examination of the iEEG correlates of neutral hypnosis

The hypnotized brain: an examination of the iEEG correlates of neutral hypnosis

DocumentExploring the alpha desynchronization hypothesis in resting state networks with intracranial electroencephalography and wiring cost estimates2017

Reference code: PT/FB
Entity holding: BIAL Foundation
Location: S. Mamede do Coronado
Title:
BIAL Foundation Archive
Start date: 1994
History:
The BIAL Foundation was created in 1994 by Laboratórios BIAL in conjunction with the Council of Rectors of Portuguese Universities. BIAL’s Foundation mission is to foster the scientific study of Man from both the physical and spiritual perspectives.
Along the years the BIAL Foundation has developed an important relationship with the scientific community, first in Portugal and after worldwide. Today it is an institution of reference which aims to stimulate new researches that may help people, promote more health and contribute to new milestones to gain access to knowledge.
Among its activities the BIAL Foundation manages the BIAL Award, created in 1984, one of the most important awards in the Health field in Europe. The BIAL Award rewards both the basic and the clinical research distinguishing works of major impact in medical research.
The BIAL Foundation also assigns Scientific Research Scholarships for the study of neurophysiological and mental health in people, arousing the interest of researchers in the areas of Psychophysiology and Parapsychology.
To date the BIAL Foundation has supported 461 projects, more than 1000 researchers, with research groups in twenty-seven countries, resulting, until April 2013, in about 600 full papers, out of which 172 published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Since 1996 the BIAL Foundation organizes the Symposia entitled "Behind and Beyond the Brain", a Forum that gathers well renowned neurosciences speakers and the BIAL Foundation Fellows which are spread around the world.
Classified as an institution of public utility, the BIAL Foundation includes among its patrons the Portuguese President, the Portuguese Universities Rectors' Council and the Portuguese Medical Association.
URL: http://www.bial.com/pt/
Accessibility: By permission

Reference code: PT/FB/BL
Entity holding: BIAL Foundation
Title: BIAL Grants
Start date: 1994
History:
In 1994 the BIAL Foundation launched a programme of science research grants with the aim of encouraging the research into Man’s physical and mental processes, namely in fields still largely unexplored but which warrant further scientific analysis, as Psychophysiology and Parapsychology.
Since its launch, applications to the BIAL grants have been increasing. Up to now 461 projects have been supported, involving more than 1000 researchers from 27 countries.
The approved applications have benefited from grants in amounts comprised between €5,000 and €50, 000. The amount to be granted is fixed by the Scientific board according to the needs of each project.
The supported projects have originated, until April 2013, in about 600 full papers, 172 out of which were published in indexed international journals with an average impact factor of 3.6 and a substantial number of citations (1665).
Among the BIAL Foundation fellows is worth highlighting the presence of scientists from prestigious universities from the United States, United Kingdom, Australia, Russia, Germany, Japan, France, Canada, and many others.
The BIAL grants are promoted biannually.

Reference code: PT/FB/BL-2014
Location: BF-GMS
Title:
2014 Grants
Start date: 2015-01

Reference code: PT/FB/BL-2014-206
Location: BF-GMS
Title:
206 - Examination of brain coordination dynamics underlying hypnosis and volitional acts using intracranial electroencephalography
Duration: 2015-05 - 2017-06
Researcher(s):
Jose Luis Perez Velazquez, Navinder Persaud, Taufik A. Valiante
Institution(s): Hospital for Sick Children, Neurology, Toronto (Canada); Toronto Western Hospital (Canada)
Contents: Contents:
Application form
Correspondence
Progress reports
Final report
Language: eng
Author:
Perez Velazquez, J. L.
Secondary author(s):
Persaud, N., Valiante, T. A.
Keywords:
Intracerebral recordings / Hypnosis / Volition / Brain coordination / Psychophysiology and Parapsychology

Reference code: PT/FB/BL-2014-206.04
Location: BF-GMS
Title:
Exploring the alpha desynchronization hypothesis in resting state networks with intracranial electroencephalography and wiring cost estimates
Publication year: 2017
URL:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5688079/
Abstract/Results: ABSTRACT:
This paper addresses a fundamental question, are eyes closed and eyes open resting states equivalent baseline conditions, or do they have consistently different electrophysiological signatures? We compare the functional connectivity patterns in an eyes closed resting state with an eyes open resting state to investigate the alpha desynchronization hypothesis. The change in functional connectivity from eyes closed to eyes open, is here, for the first time, studied with intracranial recordings. We perform network connectivity analysis in iEEG and we find that phase-based connectivity is sensitive to the transition from eyes closed to eyes open only in interhemispheral and frontal electrodes. Power based connectivity, on the other hand, consistently discriminates between the two conditions in temporal and interhemispheral electrodes. Additionally, we provide a calculation for the wiring cost, defined in terms of the connectivity between electrodes weighted by distance. We find that the wiring cost variation from eyes closed to eyes open is sensitive to the eyes closed and eyes open conditions. We extend the standard network-based approach using the filtration method from algebraic topology which does not rely on the threshold selection problem. Both the wiring cost measure defined here and this novel methodology provide a new avenue for understanding the electrophysiology of resting state.
Accessibility: Document exists in file
Language:
eng
Author:
Gómez-Ramírez, J.
Secondary author(s):
Freedman, S., Mateos, D., Perez Velazquez, J. L., Valiante, T.
Document type:
Article
Reference:
Gómez-Ramírez, J., Freedman, S., Mateos, D., Perez Velazquez, J. L., & Valiante, T. (2017). Exploring the alpha desynchronization hypothesis in resting state networks with intracranial electroencephalography and wiring cost estimates. Scientific Reports, 7(1):15670. doi: 10.1038/s41598-017-15659-0
2-year Impact Factor: 4.011|2018
Impact factor notes: Impact factor not available yet for 2019
Times cited: 5|2019-07-11
Indexed document: Yes
Quartile: Q1
Keywords: Brain synchrony / Connectivity / Intracranial electroencephalography (iEEG)

Exploring the alpha desynchronization hypothesis in resting state networks with intracranial electroencephalography and wiring cost estimates

Exploring the alpha desynchronization hypothesis in resting state networks with intracranial electroencephalography and wiring cost estimates