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Cheng CH, Chang CC, Chao YP, Lu H, Peng SW, Wang PN. Altered mismatch response precedes gray matter atrophy in subjective cognitive decline. Psychophysiology 2021; 58:e13820. [PMID: 33792049 DOI: 10.1111/psyp.13820] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 03/09/2021] [Accepted: 03/12/2021] [Indexed: 02/03/2023]
Abstract
The cross-sectional identification of subjective cognitive decline (SCD) in cognitively normal adults is particularly important for the early effective prevention or intervention of the future development of mild cognitive impairments (MCI) or Alzheimer's disease (AD). A pre-attentive neurophysiological signal that reflects the brain's ability to detect the changes of the environment is called mismatch negativity (MMN) or its magnetic counterpart (MMNm). It has been shown that patients with MCI or AD demonstrate reduced MMN/MMNm responses, while the exact profile of MMN/MMNm in SCD is substantially unknown. We applied magnetoencephalographic recordings to interrogate MMNm activities in healthy controls (HC, n = 29) and individuals with SCD (n = 26). Furthermore, we analyzed gray matter (GM) volumes in the MMNm-related regions through voxel-based morphometry and performed apolipoprotein E4 (APOE4) genotyping for all the participants. Our results showed that there were no significant differences in GM volume and proportions of APOE4 carriers between HC and SCD groups. However, individuals with SCD exhibited weakened z-corrected MMNm responses in the left inferior parietal lobule and right inferior frontal gyrus (IFG) as compared to HC. Based on the regions showing significant between-group differences, z-corrected MMNm amplitudes of the right IFG significantly correlated with the memory performance among the SCD participants. Our data suggest that neurophysiological changes of the brain, as indexed by MMNm, precede structural atrophy in the individuals with SCD compared to those without SCD.
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Affiliation(s)
- Chia-Hsiung Cheng
- Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, Chang Gung University, Taoyuan, Taiwan.,Laboratory of Brain Imaging and Neural Dynamics (BIND Lab), Chang Gung University, Taoyuan, Taiwan.,Healthy Aging Research Center, Chang Gung University, Taoyuan, Taiwan.,Department of Psychiatry, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - Chiung-Chih Chang
- Department of Neurology and Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Yi-Ping Chao
- Graduate Institute of Biomedical Engineering, Chang Gung University, Taoyuan, Taiwan.,Department of Neurology, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - Hsinjie Lu
- Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, Chang Gung University, Taoyuan, Taiwan.,Laboratory of Brain Imaging and Neural Dynamics (BIND Lab), Chang Gung University, Taoyuan, Taiwan
| | - Shih-Wei Peng
- Division of General Neurology, Department of Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan.,Department of Neurology, National Yang-Ming Chiao-Tung University, Taipei, Taiwan
| | - Pei-Ning Wang
- Division of General Neurology, Department of Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan.,Department of Neurology, National Yang-Ming Chiao-Tung University, Taipei, Taiwan.,Brain Research Center, National Yang-Ming Chiao-Tung University, Taipei, Taiwan
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Tai RY, Zhu JD, Cheng CH, Tseng YJ, Chen CC, Hsieh YW. Cortical neural activity evoked by bilateral and unilateral mirror therapy after stroke. Clin Neurophysiol 2020; 131:2333-2340. [PMID: 32828035 DOI: 10.1016/j.clinph.2020.06.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 06/05/2020] [Accepted: 06/18/2020] [Indexed: 10/23/2022]
Abstract
OBJECTIVE This study aimed to investigate the differential effects of bilateral and unilateral mirror therapy (MT) on motor cortical activations in stroke patients by magnetoencephalography (MEG). METHODS Sixteen stroke patients and 16 right-handed healthy volunteers were recruited. All participants were required to perform 4 conditions: resting, no mirror with bilateral hand movements (Bilateral-No mirror), mirror with bilateral hand movements (Bilateral-Mirror) and mirror with unilateral hand movements (Unilateral-Mirror). Beta oscillatory activities in the primary motor cortex (M1) were collected during each condition using MEG. The percentage change of beta oscillatory activity was calculated for each condition to correct the baseline differences. RESULTS In the stroke group, the percentage change of M1 beta oscillatory activity significantly decreased more in the Bilateral-Mirror condition than in the Bilateral-No mirror and Unilateral-Mirror conditions. In the healthy group, no significant differences in the percentage change of beta oscillatory activity were found among the 3 conditions. Further, a significant difference in the percentage change of beta oscillatory activity only in the Bilateral-Mirror condition was found between the 2 groups. CONCLUSIONS This study provides new information on the differential cortical activations modulated by bilateral and unilateral MT. SIGNIFICANCE Bilateral MT led to greater M1 neural activities than unilateral MT and bilateral movements without a mirror in stroke patients.
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Affiliation(s)
- Ruei-Yi Tai
- Department of Neurology, Taipei Medical University Hospital, Taipei, Taiwan; Taipei Neuroscience Institute, Taipei Medical University, Taipei, Taiwan
| | - Jun-Ding Zhu
- Institute of Brain Science, National Yang-Ming University, Taipei, Taiwan
| | - Chia-Hsiung Cheng
- Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan; Healthy Aging Research Center, Chang Gung University, Taoyuan, Taiwan; Department of Psychiatry, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - Yi-Jhan Tseng
- Department of Medical Research, Hsinchu MacKay Memorial Hospital, Hsinchu, Taiwan
| | - Chih-Chi Chen
- Department of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Linkou, Taiwan; School of Medicine, College of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Yu-Wei Hsieh
- Department of Occupational Therapy and Graduate Institute of Behavioral Sciences, College of Medicine, Chang Gung University, Taoyuan, Taiwan; Healthy Aging Research Center, Chang Gung University, Taoyuan, Taiwan; Department of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Linkou, Taiwan.
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Modulation of Motor Cortical Activities by Action Observation and Execution in Patients with Stroke: An MEG Study. Neural Plast 2019; 2019:8481371. [PMID: 31781183 PMCID: PMC6875039 DOI: 10.1155/2019/8481371] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 08/22/2019] [Accepted: 09/06/2019] [Indexed: 12/18/2022] Open
Abstract
Action observation therapy has recently attracted increasing attention; however, the mechanisms through which action observation and execution (AOE) modulate neural activity in stroke patients remain unclear. This study was aimed at investigating the effects of action observation and two types of AOE on motor cortical activations after stroke using magnetoencephalography. Twenty patients with stroke and 20 healthy controls were recruited for the collection of data on the beta oscillatory activity in the primary motor cortex (M1). All participants performed the conditions of resting, observation only, and video observation combined with execution (video AOE). Stroke patients performed one additional condition of affected hand observation combined with execution (affected hand AOE). The relative change index of beta oscillations was calculated, and nonparametric tests were used to examine the differences in conditions. In stroke patients, the relative change index of M1 beta oscillatory activity under the video AOE condition was significantly lower than that under the observation only and affected hand AOE conditions. Moreover, M1 cortical activity did not significantly differ under the observation only and affected hand AOE conditions. For healthy controls, the relative change index under the video AOE condition was significantly lower than that under the observation only condition. In addition, no significant differences in relative change indices were found under the observation only and video AOE conditions between the 2 groups. This study provides new insight into the neural mechanisms underlying AOE, which supports the use of observing videos of normal movements during action observation therapy in stroke rehabilitation.
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Yang SH, Wang PN, Cheng CH. Altered auditory repetition suppression and MMNm in relation to cognitive tests in older adults. Biol Psychol 2019; 146:107725. [DOI: 10.1016/j.biopsycho.2019.107725] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 06/06/2019] [Accepted: 06/29/2019] [Indexed: 10/26/2022]
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Age-related differences in Voice-Onset-Time in Polish language users: An ERP study. Acta Psychol (Amst) 2019; 193:18-29. [PMID: 30580059 DOI: 10.1016/j.actpsy.2018.12.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 11/15/2018] [Accepted: 12/06/2018] [Indexed: 11/23/2022] Open
Abstract
Using the Mismatch Negativity (MMN) paradigm we investigated for the first time cortical responses to consonant - vowel (CV) syllables differing in Voice-Onset-Time (VOT) for Polish, a member of the Slavic group of languages. The study aimed at testing age-related effects on different ERP responses in young (20-30 years of age) and elderly (60-68 years) native Polish speakers. Participants were presented with a sequence of voiced and voiceless stop CV syllables /to/ and /do/ with different VOT values (-100 ms, -70 ms, -30 ms, -20 ms, +20 ms, +50 ms). We analyzed MMN and P1, N1, N1', P2, N2 components. Our results showed an age-related decline in voicing perception in all tested ERP components. This decline could be explained in relation to a general slowing in neural processing with advancing age and may be associated with difficulties in temporal- and spectral-information processing in elderly people. Our findings revealed also that specific features of Slavic languages influence ERP morphology in a different way than reported in the literature for aspirating languages.
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Yoshimura Y, Kikuchi M, Hayashi N, Hiraishi H, Hasegawa C, Takahashi T, Oi M, Remijn GB, Ikeda T, Saito DN, Kumazaki H, Minabe Y. Altered human voice processing in the frontal cortex and a developmental language delay in 3- to 5-year-old children with autism spectrum disorder. Sci Rep 2017; 7:17116. [PMID: 29215027 PMCID: PMC5719344 DOI: 10.1038/s41598-017-17058-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 11/15/2017] [Indexed: 11/21/2022] Open
Abstract
The inferior frontal and superior temporal areas in the left hemisphere are crucial for human language processing. In the present study, we investigated the magnetic mismatch field (MMF) evoked by voice stimuli in 3- to 5-year-old typically developing (TD) children and children with autism spectrum disorder (ASD) using child-customized magnetoencephalography (MEG). The children with ASD exhibited significantly decreased activation in the left superior temporal gyrus compared with the TD children for the MMF amplitude. If we classified the children with ASD according to the presence of a speech onset delay (ASD - SOD and ASD - NoSOD, respectively) and compared them with the TD children, both ASD groups exhibited decreased activation in the left superior temporal gyrus compared with the TD children. In contrast, the ASD - SOD group exhibited increased activity in the left frontal cortex (i.e., pars orbitalis) compared with the other groups. For all children with ASD, there was a significant negative correlation between the MMF amplitude in the left pars orbitalis and language performance. This investigation is the first to show a significant difference in two distinct MMF regions in ASD – SOD children compared with TD children.
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Affiliation(s)
- Yuko Yoshimura
- Research Center for Child Mental Development, Kanazawa University, Kanazawa, 920-8640, Japan
| | - Mitsuru Kikuchi
- Research Center for Child Mental Development, Kanazawa University, Kanazawa, 920-8640, Japan.
| | - Norio Hayashi
- Gunma Prefectural College of Health Science, Maebashi, 371-0052, Japan
| | - Hirotoshi Hiraishi
- Research Center for Child Mental Development, Kanazawa University, Kanazawa, 920-8640, Japan
| | - Chiaki Hasegawa
- Research Center for Child Mental Development, Kanazawa University, Kanazawa, 920-8640, Japan
| | - Tetsuya Takahashi
- Health Administration Center, University of Fukui, Fukui, 910-1193, Japan
| | - Manabu Oi
- Research Center for Child Mental Development, Kanazawa University, Kanazawa, 920-8640, Japan
| | - Gerard B Remijn
- International Education Center, Kyushu University, Fukuoka, 815-8540, Japan
| | - Takashi Ikeda
- Research Center for Child Mental Development, Kanazawa University, Kanazawa, 920-8640, Japan
| | - Daisuke N Saito
- Research Center for Child Mental Development, Kanazawa University, Kanazawa, 920-8640, Japan
| | - Hirokazu Kumazaki
- Research Center for Child Mental Development, Kanazawa University, Kanazawa, 920-8640, Japan
| | - Yoshio Minabe
- Research Center for Child Mental Development, Kanazawa University, Kanazawa, 920-8640, Japan
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Cheng CH, Sun HH, Weng JQ, Tseng YJ. Differential motor cortex excitability during observation of normal and abnormal goal-directed movement patterns. Neurosci Res 2017; 123:36-42. [PMID: 28457959 DOI: 10.1016/j.neures.2017.04.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Revised: 04/10/2017] [Accepted: 04/24/2017] [Indexed: 10/19/2022]
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Abstract
Hearing-impaired patients often encounter obstacles in communication. Not all of them wear hearing aids, citing issues with usage difficulty and discomfort in wearing. To overcome these difficulties, a new endeavor was started to improve sound intelligibility from the speaker's side. The present study objectively evaluated an intelligible-hearing (IH) loudspeaker by means of magnetoencephalography. Magnetic counterparts of mismatch negativity (MMNm) to pronunciation ('mi' and 'ni') were recorded and compared when they were transmitted from the IH loudspeaker and from a normal-hearing loudspeaker. On using the IH loudspeaker, the peak latency was found to be significantly shortened. In the case of hearing-impaired participants, marked MMNm responses were observed only when the IH loudspeaker was used. These findings suggest that improving sound intelligibility may be a supportive and rehabilitative approach for hearing-impaired patients.
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Hincapié AS, Kujala J, Mattout J, Pascarella A, Daligault S, Delpuech C, Mery D, Cosmelli D, Jerbi K. The impact of MEG source reconstruction method on source-space connectivity estimation: A comparison between minimum-norm solution and beamforming. Neuroimage 2017; 156:29-42. [PMID: 28479475 DOI: 10.1016/j.neuroimage.2017.04.038] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 04/01/2017] [Accepted: 04/15/2017] [Indexed: 01/11/2023] Open
Abstract
Despite numerous important contributions, the investigation of brain connectivity with magnetoencephalography (MEG) still faces multiple challenges. One critical aspect of source-level connectivity, largely overlooked in the literature, is the putative effect of the choice of the inverse method on the subsequent cortico-cortical coupling analysis. We set out to investigate the impact of three inverse methods on source coherence detection using simulated MEG data. To this end, thousands of randomly located pairs of sources were created. Several parameters were manipulated, including inter- and intra-source correlation strength, source size and spatial configuration. The simulated pairs of sources were then used to generate sensor-level MEG measurements at varying signal-to-noise ratios (SNR). Next, the source level power and coherence maps were calculated using three methods (a) L2-Minimum-Norm Estimate (MNE), (b) Linearly Constrained Minimum Variance (LCMV) beamforming, and (c) Dynamic Imaging of Coherent Sources (DICS) beamforming. The performances of the methods were evaluated using Receiver Operating Characteristic (ROC) curves. The results indicate that beamformers perform better than MNE for coherence reconstructions if the interacting cortical sources consist of point-like sources. On the other hand, MNE provides better connectivity estimation than beamformers, if the interacting sources are simulated as extended cortical patches, where each patch consists of dipoles with identical time series (high intra-patch coherence). However, the performance of the beamformers for interacting patches improves substantially if each patch of active cortex is simulated with only partly coherent time series (partial intra-patch coherence). These results demonstrate that the choice of the inverse method impacts the results of MEG source-space coherence analysis, and that the optimal choice of the inverse solution depends on the spatial and synchronization profile of the interacting cortical sources. The insights revealed here can guide method selection and help improve data interpretation regarding MEG connectivity estimation.
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Affiliation(s)
- Ana-Sofía Hincapié
- Psychology Department, University of Montreal, Quebec, Canada; Lyon Neuroscience Research Center, CRNL, INSERM, U1028 - CNRS - UMR5292, University Lyon 1, Brain Dynamics and Cognition Team, Lyon, France; Department of Computer Science, Pontificia Universidad Católica de Chile, Santiago de Chile, Chile; Escuela de Psicología, Pontificia Universidad Católica de Chile and Interdisciplinary Center for Neurosciences, Pontificia Universidad Católica de Chile, Santiago de Chile, Chile.
| | - Jan Kujala
- Lyon Neuroscience Research Center, CRNL, INSERM, U1028 - CNRS - UMR5292, University Lyon 1, Brain Dynamics and Cognition Team, Lyon, France; Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland.
| | - Jérémie Mattout
- Lyon Neuroscience Research Center, CRNL, INSERM, U1028 - CNRS - UMR5292, University Lyon 1, Brain Dynamics and Cognition Team, Lyon, France.
| | - Annalisa Pascarella
- Consiglio Nazionale delle Ricerche (CNR - National Research Council), Rome, Italy.
| | | | - Claude Delpuech
- Lyon Neuroscience Research Center, CRNL, INSERM, U1028 - CNRS - UMR5292, University Lyon 1, Brain Dynamics and Cognition Team, Lyon, France; MEG Center, CERMEP, Lyon, France.
| | - Domingo Mery
- Department of Computer Science, Pontificia Universidad Católica de Chile, Santiago de Chile, Chile.
| | - Diego Cosmelli
- Escuela de Psicología, Pontificia Universidad Católica de Chile and Interdisciplinary Center for Neurosciences, Pontificia Universidad Católica de Chile, Santiago de Chile, Chile.
| | - Karim Jerbi
- Psychology Department, University of Montreal, Quebec, Canada; Lyon Neuroscience Research Center, CRNL, INSERM, U1028 - CNRS - UMR5292, University Lyon 1, Brain Dynamics and Cognition Team, Lyon, France.
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Wilson TW, Heinrichs-Graham E, Proskovec AL, McDermott TJ. Neuroimaging with magnetoencephalography: A dynamic view of brain pathophysiology. Transl Res 2016; 175:17-36. [PMID: 26874219 PMCID: PMC4959997 DOI: 10.1016/j.trsl.2016.01.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 01/15/2016] [Accepted: 01/18/2016] [Indexed: 01/12/2023]
Abstract
Magnetoencephalography (MEG) is a noninvasive, silent, and totally passive neurophysiological imaging method with excellent temporal resolution (∼1 ms) and good spatial precision (∼3-5 mm). In a typical experiment, MEG data are acquired as healthy controls or patients with neurologic or psychiatric disorders perform a specific cognitive task, or receive sensory stimulation. The resulting data are generally analyzed using standard electrophysiological methods, coupled with advanced image reconstruction algorithms. To date, the total number of MEG instruments and associated users is significantly smaller than comparable human neuroimaging techniques, although this is likely to change in the near future with advances in the technology. Despite this small base, MEG research has made a significant impact on several areas of translational neuroscience, largely through its unique capacity to quantify the oscillatory dynamics of activated brain circuits in humans. This review focuses on the clinical areas where MEG imaging has arguably had the greatest impact in regard to the identification of aberrant neural dynamics at the regional and network level, monitoring of disease progression, determining how efficacious pharmacologic and behavioral interventions modulate neural systems, and the development of neural markers of disease. Specifically, this review covers recent advances in understanding the abnormal neural oscillatory dynamics that underlie Parkinson's disease, autism spectrum disorders, human immunodeficiency virus (HIV)-associated neurocognitive disorders, cerebral palsy, attention-deficit hyperactivity disorder, cognitive aging, and post-traumatic stress disorder. MEG imaging has had a major impact on how clinical neuroscientists understand the brain basis of these disorders, and its translational influence is rapidly expanding with new discoveries and applications emerging continuously.
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Affiliation(s)
- Tony W Wilson
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center (UNMC), Omaha, Neb; Center for Magnetoencephalography, UNMC, Omaha, Neb; Department of Neurological Sciences, UNMC, Omaha, Neb.
| | - Elizabeth Heinrichs-Graham
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center (UNMC), Omaha, Neb; Center for Magnetoencephalography, UNMC, Omaha, Neb
| | - Amy L Proskovec
- Center for Magnetoencephalography, UNMC, Omaha, Neb; Department of Psychology, University of Nebraska - Omaha, Neb
| | - Timothy J McDermott
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center (UNMC), Omaha, Neb; Center for Magnetoencephalography, UNMC, Omaha, Neb
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Auditory perception in the aging brain: the role of inhibition and facilitation in early processing. Neurobiol Aging 2016; 47:23-34. [PMID: 27522518 PMCID: PMC5082767 DOI: 10.1016/j.neurobiolaging.2016.06.022] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 06/06/2016] [Accepted: 06/29/2016] [Indexed: 11/23/2022]
Abstract
Aging affects the interplay between peripheral and cortical auditory processing. Previous studies have demonstrated that older adults are less able to regulate afferent sensory information and are more sensitive to distracting information. Using auditory event-related potentials we investigated the role of cortical inhibition on auditory and audiovisual processing in younger and older adults. Across puretone, auditory and audiovisual speech paradigms older adults showed a consistent pattern of inhibitory deficits, manifested as increased P50 and/or N1 amplitudes and an absent or significantly reduced N2. Older adults were still able to use congruent visual articulatory information to aid auditory processing but appeared to require greater neural effort to resolve conflicts generated by incongruent visual information. In combination, the results provide support for the Inhibitory Deficit Hypothesis of aging. They extend previous findings into the audiovisual domain and highlight older adults' ability to benefit from congruent visual information during speech processing.
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MEG Connectivity and Power Detections with Minimum Norm Estimates Require Different Regularization Parameters. COMPUTATIONAL INTELLIGENCE AND NEUROSCIENCE 2016; 2016:3979547. [PMID: 27092179 PMCID: PMC4820599 DOI: 10.1155/2016/3979547] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 01/19/2016] [Accepted: 02/14/2016] [Indexed: 11/24/2022]
Abstract
Minimum Norm Estimation (MNE) is an inverse solution method widely used to reconstruct the source time series that underlie magnetoencephalography (MEG) data. MNE addresses the ill-posed nature of MEG source estimation through regularization (e.g., Tikhonov regularization). Selecting the best regularization parameter is a critical step. Generally, once set, it is common practice to keep the same coefficient throughout a study. However, it is yet to be known whether the optimal lambda for spectral power analysis of MEG source data coincides with the optimal regularization for source-level oscillatory coupling analysis. We addressed this question via extensive Monte-Carlo simulations of MEG data, where we generated 21,600 configurations of pairs of coupled sources with varying sizes, signal-to-noise ratio (SNR), and coupling strengths. Then, we searched for the Tikhonov regularization coefficients (lambda) that maximize detection performance for (a) power and (b) coherence. For coherence, the optimal lambda was two orders of magnitude smaller than the best lambda for power. Moreover, we found that the spatial extent of the interacting sources and SNR, but not the extent of coupling, were the main parameters affecting the best choice for lambda. Our findings suggest using less regularization when measuring oscillatory coupling compared to power estimation.
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Cheng CH, Tseng YJ, Chen RS, Lin YY. Reduced functional connectivity of somatosensory network in writer's cramp patients. Brain Behav 2016; 6:e00433. [PMID: 26839735 PMCID: PMC4726822 DOI: 10.1002/brb3.433] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 09/07/2015] [Accepted: 12/16/2015] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND The involvement of motor cortex and sensorimotor integration in patients with writer's cramp (WC) has been well documented. However, the exact neurophysiological profile within the somatosensory system, including primary somatosensory cortex (SI), contralateral (SIIc), and ipsilateral (SIIi) secondary somatosensory areas remains less understood. METHODS This study investigated the neuromagnetic cortical activities of median nerve stimulation in 10 patients with WC and 10 healthy controls (HC). To comprehensively explore all the aspects of somatosensory functioning, we analyzed our data with the minimum norm estimate (MNE), the time-frequency approach with evoked and induced activities, and functional connectivity between SI and SIIc (SI-SIIc), SI and SIIi (SI-SIIi), and SIIc and SIIi (SIIc-SIIi) from theta to gamma oscillations. RESULTS No significant between-group differences were found in the MNE cortical amplitudes of SI, SIIc, and SIIi. Power strengths of evoked gamma oscillation and induced beta synchronization were also equivalent between WC and HC groups. However, we found significantly reduced theta coherence of SI-SIIi, alpha coherence of SI-SIIi and SIIc-SIIi, as well as beta coherence of SIIc-SIIi in patients with WC. CONCLUSION Our results suggest the involvement of somatosensory abnormalities, primarily with the form of functional connectivity, in patients with WC.
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Affiliation(s)
- Chia-Hsiung Cheng
- Department of Occupational Therapy Graduate Institute of Behavioral Sciences Chang Gung University Taoyuan Taiwan; Healthy Aging Research Center Chang Gung University Taoyuan Taiwan; Department of Psychiatry Chang Gung Memorial Hospital Taoyuan Taiwan
| | - Yi-Jhan Tseng
- Institute of Physiology National Yang-Ming University Taipei Taiwan; Laboratory of Neurophysiology Taipei Veterans General Hospital Taipei Taiwan
| | - Rou-Shayn Chen
- Department of Neurology Chang Gung Memorial Hospital Taoyuan Taiwan; College of Medicine Chang Gung University Taoyuan Taiwan
| | - Yung-Yang Lin
- Institute of Physiology National Yang-Ming University Taipei Taiwan; Laboratory of Neurophysiology Taipei Veterans General Hospital Taipei Taiwan; Institute of Brain Science National Yang-Ming University Taipei Taiwan; Department of Neurology Taipei Veterans General Hospital Taipei Taiwan
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Region-specific reduction of auditory sensory gating in older adults. Brain Cogn 2015; 101:64-72. [DOI: 10.1016/j.bandc.2015.10.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 10/13/2015] [Accepted: 10/16/2015] [Indexed: 11/21/2022]
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A meta-analysis of mismatch negativity in children with attention deficit-hyperactivity disorders. Neurosci Lett 2015; 612:132-137. [PMID: 26628248 DOI: 10.1016/j.neulet.2015.11.033] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2015] [Revised: 11/17/2015] [Accepted: 11/22/2015] [Indexed: 12/14/2022]
Abstract
Mismatch negativity (MMN) is an optimal neurophysiological signal to assess the integrity of auditory sensory memory and involuntary attention switch. The generation of MMN is independent of overt behavioral requirements, concentration or motivation, and thus serves as a suitable tool to study the perceptual function in children with attention deficit-hyperactivity disorders (ADHD). It remains unclear whether ADHD children showed altered MMN responses. Therefore we performed a meta-analysis of peer-reviewed MMN studies that had targeted both typically developed and ADHD children to examine the pooled effect size. The published articles between 1990 and 2014 were searched in PubMed, Medline, Cochrane, and CINAHL. The mean effect size and a 95% confidence interval (CI) were estimated. Six studies, consisting of 10 individual investigations, were included in the final analysis. A significant effect size of 0.28 was found (p=0.028, 95% CI at 0.03-0.53). These results were also free from publication bias or heterogeneity. In conclusion, our meta-analysis results suggest ADHD children demonstrated a reduced MMN amplitude compared to healthy controls.
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Age-Related Reduced Somatosensory Gating Is Associated with Altered Alpha Frequency Desynchronization. Neural Plast 2015; 2015:302878. [PMID: 26417458 PMCID: PMC4568376 DOI: 10.1155/2015/302878] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 02/24/2015] [Accepted: 02/24/2015] [Indexed: 11/18/2022] Open
Abstract
Sensory gating (SG), referring to an attenuated neural response to the second identical stimulus, is considered as preattentive processing in the central nervous system to filter redundant sensory inputs. Insufficient somatosensory SG has been found in the aged adults, particularly in the secondary somatosensory cortex (SII). However, it remains unclear which variables leading to the age-related somatosensory SG decline. There has been evidence showing a relationship between brain oscillations and cortical evoked excitability. Thus, this study used whole-head magnetoencephalography to record responses to paired-pulse electrical stimulation to the left median nerve in healthy young and elderly participants to test whether insufficient stimulus 1- (S1-) induced event-related desynchronization (ERD) contributes to a less-suppressed stimulus 2- (S2-) evoked response. Our analysis revealed that the minimum norm estimates showed age-related reduction of SG in the bilateral SII regions. Spectral power analysis showed that the elderly demonstrated significantly reduced alpha ERD in the contralateral SII (SIIc). Moreover, it was striking to note that lower S1-induced alpha ERD was associated with higher S2-evoked amplitudes in the SIIc among the aged adults. Conclusively, our findings suggest that age-related decline of somatosensory SG is partially attributed to the altered S1-induced oscillatory activity.
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