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Hinkley LBN, Marco EJ, Findlay AM, Honma S, Jeremy RJ, Strominger Z, Bukshpun P, Wakahiro M, Brown WS, Paul LK, Barkovich AJ, Mukherjee P, Nagarajan SS, Sherr EH. The role of corpus callosum development in functional connectivity and cognitive processing. PLoS One 2012; 7:e39804. [PMID: 22870191 PMCID: PMC3411722 DOI: 10.1371/journal.pone.0039804] [Citation(s) in RCA: 115] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2011] [Accepted: 05/29/2012] [Indexed: 12/17/2022] Open
Abstract
The corpus callosum is hypothesized to play a fundamental role in integrating information and mediating complex behaviors. Here, we demonstrate that lack of normal callosal development can lead to deficits in functional connectivity that are related to impairments in specific cognitive domains. We examined resting-state functional connectivity in individuals with agenesis of the corpus callosum (AgCC) and matched controls using magnetoencephalographic imaging (MEG-I) of coherence in the alpha (8-12 Hz), beta (12-30 Hz) and gamma (30-55 Hz) bands. Global connectivity (GC) was defined as synchronization between a region and the rest of the brain. In AgCC individuals, alpha band GC was significantly reduced in the dorsolateral pre-frontal (DLPFC), posterior parietal (PPC) and parieto-occipital cortices (PO). No significant differences in GC were seen in either the beta or gamma bands. We also explored the hypothesis that, in AgCC, this regional reduction in functional connectivity is explained primarily by a specific reduction in interhemispheric connectivity. However, our data suggest that reduced connectivity in these regions is driven by faulty coupling in both inter- and intrahemispheric connectivity. We also assessed whether the degree of connectivity correlated with behavioral performance, focusing on cognitive measures known to be impaired in AgCC individuals. Neuropsychological measures of verbal processing speed were significantly correlated with resting-state functional connectivity of the left medial and superior temporal lobe in AgCC participants. Connectivity of DLPFC correlated strongly with performance on the Tower of London in the AgCC cohort. These findings indicate that the abnormal callosal development produces salient but selective (alpha band only) resting-state functional connectivity disruptions that correlate with cognitive impairment. Understanding the relationship between impoverished functional connectivity and cognition is a key step in identifying the neural mechanisms of language and executive dysfunction in common neurodevelopmental and psychiatric disorders where disruptions of callosal development are consistently identified.
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Affiliation(s)
- Leighton B. N. Hinkley
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, United States of America
| | - Elysa J. Marco
- Department of Neurology, University of California San Francisco, San Francisco, California, United States of America
- Department of Pediatrics, University of California San Francisco, San Francisco, California, United States of America
| | - Anne M. Findlay
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, United States of America
| | - Susanne Honma
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, United States of America
| | - Rita J. Jeremy
- Department of Pediatrics, University of California San Francisco, San Francisco, California, United States of America
| | - Zoe Strominger
- Department of Neurology, University of California San Francisco, San Francisco, California, United States of America
| | - Polina Bukshpun
- Department of Neurology, University of California San Francisco, San Francisco, California, United States of America
| | - Mari Wakahiro
- Department of Neurology, University of California San Francisco, San Francisco, California, United States of America
| | - Warren S. Brown
- Travis Research Institute, Fuller Theological Seminary, Pasadena, California, United States of America
| | - Lynn K. Paul
- Travis Research Institute, Fuller Theological Seminary, Pasadena, California, United States of America
- Department of Neuroscience, Caltech, Pasadena, California, United States of America
| | - A. James Barkovich
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, United States of America
- Department of Neurology, University of California San Francisco, San Francisco, California, United States of America
- Department of Pediatrics, University of California San Francisco, San Francisco, California, United States of America
| | - Pratik Mukherjee
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, United States of America
| | - Srikantan S. Nagarajan
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, United States of America
| | - Elliott H. Sherr
- Department of Neurology, University of California San Francisco, San Francisco, California, United States of America
- Department of Pediatrics, University of California San Francisco, San Francisco, California, United States of America
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103
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Resting state α-band functional connectivity and recovery after stroke. Exp Neurol 2012; 237:160-9. [PMID: 22750324 DOI: 10.1016/j.expneurol.2012.06.020] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Revised: 06/08/2012] [Accepted: 06/20/2012] [Indexed: 11/23/2022]
Abstract
After cerebral ischemia, disruption and subsequent reorganization of functional connections occur both locally and remote to the lesion. However, the unpredictable timing and extent of sensorimotor recovery reflects a gap in understanding of these underlying neural mechanisms. We aimed to identify the plasticity of alpha-band functional neural connections within the perilesional area and the predictive value of functional connectivity with respect to motor recovery of the upper extremity after stroke. Our results show improvements in upper extremity motor recovery in relation to distributed changes in MEG-based alpha band functional connectivity, both in the perilesional area and contralesional cortex. Motor recovery was found to be predicted by increased connectivity at baseline in the ipsilesional somatosensory area, supplementary motor area, and cerebellum, contrasted with reduced connectivity of contralesional motor regions, after controlling for age, stroke onset-time and lesion size. These findings support plasticity within a widely distributed neural network and define brain regions in which the extent of network participation predicts post-stroke recovery potential.
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104
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Freyer F, Reinacher M, Nolte G, Dinse HR, Ritter P. Repetitive tactile stimulation changes resting-state functional connectivity-implications for treatment of sensorimotor decline. Front Hum Neurosci 2012; 6:144. [PMID: 22654748 PMCID: PMC3358755 DOI: 10.3389/fnhum.2012.00144] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2012] [Accepted: 05/08/2012] [Indexed: 11/13/2022] Open
Abstract
Neurological disorders and physiological aging can lead to a decline of perceptual abilities. In contrast to the conventional therapeutic approach that comprises intensive training and practicing, passive repetitive sensory stimulation (RSS) has recently gained increasing attention as an alternative to countervail the sensory decline by improving perceptual abilities without the need of active participation. A particularly effective type of high-frequency RSS, utilizing Hebbian learning principles, improves perceptual acuity as well as sensorimotor functions and has been successfully applied to treat chronic stroke patients and elderly subjects. High-frequency RSS has been shown to induce plastic changes of somatosensory cortex such as representational map reorganization, but its impact on the brain's ongoing network activity and resting-state functional connectivity has not been investigated so far. Here, we applied high-frequency RSS in healthy human subjects and analyzed resting state Electroencephalography (EEG) functional connectivity patterns before and after RSS by means of imaginary coherency (ImCoh), a frequency-specific connectivity measure which is known to reduce over-estimation biases due to volume conduction and common reference. Thirty minutes of passive high-frequency RSS lead to significant ImCoh-changes of the resting state mu-rhythm in the individual upper alpha frequency band within distributed sensory and motor cortical areas. These stimulation induced distributed functional connectivity changes likely underlie the previously observed improvement in sensorimotor integration.
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Affiliation(s)
- Frank Freyer
- Bernstein Focus State Dependencies of Learning and Bernstein Center for Computational NeuroscienceBerlin, Germany
- Department of Neurology, Charité University MedicineBerlin, Germany
- Institute for Neuroinformatics, Neural Plasticity Lab, Ruhr-University BochumGermany
| | - Matthias Reinacher
- Bernstein Focus State Dependencies of Learning and Bernstein Center for Computational NeuroscienceBerlin, Germany
- Department of Neurology, Charité University MedicineBerlin, Germany
| | - Guido Nolte
- Department of Neurophysiology and Pathophysiology, University Medical Center Hamburg-EppendorfHamburg, Germany
| | - Hubert R. Dinse
- Institute for Neuroinformatics, Neural Plasticity Lab, Ruhr-University BochumGermany
| | - Petra Ritter
- Bernstein Focus State Dependencies of Learning and Bernstein Center for Computational NeuroscienceBerlin, Germany
- Department of Neurology, Charité University MedicineBerlin, Germany
- Max Planck Institute for Human Cognitive and Brain SciencesLeipzig, Germany
- Berlin School of Mind and Brain and Mind and Brain Institute, Humboldt UniversityBerlin, Germany
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105
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Dubovik S, Pignat JM, Ptak R, Aboulafia T, Allet L, Gillabert N, Magnin C, Albert F, Momjian-Mayor I, Nahum L, Lascano AM, Michel CM, Schnider A, Guggisberg AG. The behavioral significance of coherent resting-state oscillations after stroke. Neuroimage 2012; 61:249-57. [PMID: 22440653 DOI: 10.1016/j.neuroimage.2012.03.024] [Citation(s) in RCA: 114] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 02/23/2012] [Accepted: 03/04/2012] [Indexed: 02/04/2023] Open
Abstract
Stroke lesions induce not only loss of local neural function, but disruptions in spatially distributed areas. However, it is unknown whether they affect the synchrony of electrical oscillations in neural networks and if changes in network coherence are associated with neurological deficits. This study assessed these questions in a population of patients with subacute, unilateral, ischemic stroke. Spontaneous cortical oscillations were reconstructed from high-resolution electroencephalograms (EEG) with adaptive spatial filters. Maps of functional connectivity (FC) between brain areas were created and correlated with patient performance in motor and cognitive scores. In comparison to age matched healthy controls, stroke patients showed a selective disruption of FC in the alpha frequency range. The spatial distribution of alpha band FC reflected the pattern of motor and cognitive deficits of the individual patient: network nodes that participate normally in the affected functions showed local decreases in FC with the rest of the brain. Interregional FC in the alpha band, but not in delta, theta, or beta frequencies, was highly correlated with motor and cognitive performance. In contrast, FC between contralesional areas and the rest of the brain was negatively associated with patient performance. Alpha oscillation synchrony at rest is a unique and specific marker of network function and linearly associated with behavioral performance. Maps of alpha synchrony computed from a single resting-state EEG recording provide a robust and convenient window into the functionality and organization of cortical networks with numerous potential applications.
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Affiliation(s)
- Sviatlana Dubovik
- Division of Neurorehabilitation, University Hospital of Geneva, Switzerland
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106
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van den Heuvel MP, Kahn RS. Abnormal brain wiring as a pathogenetic mechanism in schizophrenia. Biol Psychiatry 2011; 70:1107-8. [PMID: 22115412 DOI: 10.1016/j.biopsych.2011.10.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Accepted: 10/19/2011] [Indexed: 11/15/2022]
Affiliation(s)
- Martijn P van den Heuvel
- Department of Psychiatry, University Medical Center Utrecht, Rudolf Magnus Institute of Neuroscience, Utrecht, The Netherlands.
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