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Zhang W, Jiang M, Teo KAC, Bhuvanakantham R, Fong L, Sim WKJ, Guo Z, Foo CHV, Chua RHJ, Padmanabhan P, Leong V, Lu J, Gulyás B, Guan C. Revealing the spatiotemporal brain dynamics of covert speech compared with overt speech: A simultaneous EEG-fMRI study. Neuroimage 2024; 293:120629. [PMID: 38697588 DOI: 10.1016/j.neuroimage.2024.120629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 04/17/2024] [Accepted: 04/29/2024] [Indexed: 05/05/2024] Open
Abstract
Covert speech (CS) refers to speaking internally to oneself without producing any sound or movement. CS is involved in multiple cognitive functions and disorders. Reconstructing CS content by brain-computer interface (BCI) is also an emerging technique. However, it is still controversial whether CS is a truncated neural process of overt speech (OS) or involves independent patterns. Here, we performed a word-speaking experiment with simultaneous EEG-fMRI. It involved 32 participants, who generated words both overtly and covertly. By integrating spatial constraints from fMRI into EEG source localization, we precisely estimated the spatiotemporal dynamics of neural activity. During CS, EEG source activity was localized in three regions: the left precentral gyrus, the left supplementary motor area, and the left putamen. Although OS involved more brain regions with stronger activations, CS was characterized by an earlier event-locked activation in the left putamen (peak at 262 ms versus 1170 ms). The left putamen was also identified as the only hub node within the functional connectivity (FC) networks of both OS and CS, while showing weaker FC strength towards speech-related regions in the dominant hemisphere during CS. Path analysis revealed significant multivariate associations, indicating an indirect association between the earlier activation in the left putamen and CS, which was mediated by reduced FC towards speech-related regions. These findings revealed the specific spatiotemporal dynamics of CS, offering insights into CS mechanisms that are potentially relevant for future treatment of self-regulation deficits, speech disorders, and development of BCI speech applications.
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Affiliation(s)
- Wei Zhang
- Cognitive Neuroimaging Centre, Nanyang Technological University, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore
| | - Muyun Jiang
- School of Computer Science and Engineering, Nanyang Technological University, Singapore
| | - Kok Ann Colin Teo
- Cognitive Neuroimaging Centre, Nanyang Technological University, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore; IGP-Neuroscience, Interdisciplinary Graduate Programme, Nanyang Technological University, Singapore; Division of Neurosurgery, National University Health System, Singapore
| | - Raghavan Bhuvanakantham
- Cognitive Neuroimaging Centre, Nanyang Technological University, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore
| | - LaiGuan Fong
- Cognitive Neuroimaging Centre, Nanyang Technological University, Singapore
| | - Wei Khang Jeremy Sim
- Cognitive Neuroimaging Centre, Nanyang Technological University, Singapore; IGP-Neuroscience, Interdisciplinary Graduate Programme, Nanyang Technological University, Singapore
| | - Zhiwei Guo
- School of Computer Science and Engineering, Nanyang Technological University, Singapore
| | | | | | - Parasuraman Padmanabhan
- Cognitive Neuroimaging Centre, Nanyang Technological University, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore
| | - Victoria Leong
- Division of Psychology, Nanyang Technological University, Singapore; Department of Pediatrics, University of Cambridge, United Kingdom
| | - Jia Lu
- Cognitive Neuroimaging Centre, Nanyang Technological University, Singapore; DSO National Laboratories, Singapore; Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Balázs Gulyás
- Cognitive Neuroimaging Centre, Nanyang Technological University, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore; Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
| | - Cuntai Guan
- School of Computer Science and Engineering, Nanyang Technological University, Singapore.
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Matsuzaki J, Kagitani-Shimono K, Aoki S, Hanaie R, Kato Y, Nakanishi M, Tatsumi A, Tominaga K, Yamamoto T, Nagai Y, Mohri I, Taniike M. Abnormal cortical responses elicited by audiovisual movies in patients with autism spectrum disorder with atypical sensory behavior: A magnetoencephalographic study. Brain Dev 2022; 44:81-94. [PMID: 34563417 DOI: 10.1016/j.braindev.2021.08.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 08/09/2021] [Accepted: 08/30/2021] [Indexed: 12/23/2022]
Abstract
BACKGROUND Atypical sensory behavior disrupts behavioral adaptation in children with autism spectrum disorder (ASD); however, neural correlates of sensory dysfunction using magnetoencephalography (MEG) remain unclear. METHOD We used MEG to measure the cortical activation elicited by visual (uni)/audiovisual (multisensory) movies in 46 children (7-14 years) were included in final analysis: 13 boys with atypical audiovisual behavior in ASD (AAV+), 10 without this condition, and 23 age-matched typically developing boys. RESULTS The AAV+ group demonstrated an increase in the cortical activation in the bilateral insula in response to unisensory movies and in the left occipital, right superior temporal sulcus (rSTS), and temporal regions to multisensory movies. These increased responses were correlated with severity of the sensory impairment. Increased theta-low gamma oscillations were observed in the rSTS in AAV+. CONCLUSION The findings suggest that AAV is attributed to atypical neural networks centered on the rSTS.
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Affiliation(s)
- Junko Matsuzaki
- Division of Developmental Neuroscience, Department of Child Development, United Graduate School of Child Development, Osaka University, Osaka, Japan; Molecular Research Center for Children's Mental Development, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Kuriko Kagitani-Shimono
- Division of Developmental Neuroscience, Department of Child Development, United Graduate School of Child Development, Osaka University, Osaka, Japan; Molecular Research Center for Children's Mental Development, Osaka University Graduate School of Medicine, Osaka, Japan; Department of Pediatrics, Osaka University Graduate School of Medicine, Osaka, Japan.
| | - Sho Aoki
- Division of Developmental Neuroscience, Department of Child Development, United Graduate School of Child Development, Osaka University, Osaka, Japan
| | - Ryuzo Hanaie
- Molecular Research Center for Children's Mental Development, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yoko Kato
- Division of Developmental Neuroscience, Department of Child Development, United Graduate School of Child Development, Osaka University, Osaka, Japan
| | - Mariko Nakanishi
- Molecular Research Center for Children's Mental Development, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Aika Tatsumi
- Molecular Research Center for Children's Mental Development, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Koji Tominaga
- Division of Developmental Neuroscience, Department of Child Development, United Graduate School of Child Development, Osaka University, Osaka, Japan; Department of Pediatrics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Tomoka Yamamoto
- Molecular Research Center for Children's Mental Development, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yukie Nagai
- International Research Center for Neurointelligence, The University of Tokyo, Tokyo, Japan
| | - Ikuko Mohri
- Division of Developmental Neuroscience, Department of Child Development, United Graduate School of Child Development, Osaka University, Osaka, Japan; Molecular Research Center for Children's Mental Development, Osaka University Graduate School of Medicine, Osaka, Japan; Department of Pediatrics, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Masako Taniike
- Division of Developmental Neuroscience, Department of Child Development, United Graduate School of Child Development, Osaka University, Osaka, Japan; Molecular Research Center for Children's Mental Development, Osaka University Graduate School of Medicine, Osaka, Japan; Department of Pediatrics, Osaka University Graduate School of Medicine, Osaka, Japan
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3
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Left hemispheric α band cerebral oscillatory changes correlate with verbal memory. Sci Rep 2020; 10:14993. [PMID: 32929146 PMCID: PMC7490359 DOI: 10.1038/s41598-020-72087-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Accepted: 08/25/2020] [Indexed: 11/12/2022] Open
Abstract
Event-related synchronisation (ERS) and event-related desynchronisation (ERD) have been observed via magnetoencephalography (MEG) in the language-dominant hemisphere. However, the relationship between ERS/ERD and clinical language indices is unclear. Therefore, the present study evaluated brain activity utilising MEG during a verb generation task in 36 subjects and determined ERS/ERD power values in θ, α, β, low γ and high γ frequency bands. To measure clinical language indices, we adopted Wechsler Memory Scale-revised. We observed ERD in the α band from the bilateral occipital to the left central brain region, in the β band from the bilateral occipital to the left frontal region and in the low γ band a high-power signal in the left frontal region. We also observed ERS in the θ band in bilateral frontal region and in the high γ band in bilateral occipital region. Furthermore, we found a significant negative correlation between α-band ERD power at the left postcentral gyrus and medial superior frontal gyrus and verbal memory score (correlation coefficients = − 0.574 and − 0.597, respectively). These results suggest that individuals with lower linguistic memory have less desynchronised α-band ERD power and α-band ERD power in the left hemisphere may be a neurophysiological biomarker for verbal memory.
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Coolen T, Wens V, Vander Ghinst M, Mary A, Bourguignon M, Naeije G, Peigneux P, Sadeghi N, Goldman S, De Tiège X. Frequency-Dependent Intrinsic Electrophysiological Functional Architecture of the Human Verbal Language Network. Front Integr Neurosci 2020; 14:27. [PMID: 32528258 PMCID: PMC7264165 DOI: 10.3389/fnint.2020.00027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 04/16/2020] [Indexed: 11/13/2022] Open
Abstract
Functional magnetic resonance imaging (fMRI) allowed the spatial characterization of the resting-state verbal language network (vLN). While other resting-state networks (RSNs) were matched with their electrophysiological equivalents at rest and could be spectrally defined, such correspondence is lacking for the vLN. This magnetoencephalography (MEG) study aimed at defining the spatio-spectral characteristics of the neuromagnetic intrinsic functional architecture of the vLN. Neuromagnetic activity was recorded at rest in 100 right-handed healthy adults (age range: 18-41 years). Band-limited power envelope correlations were performed within and across frequency bands (θ, α, β, and low γ) from a seed region placed in the left Broca's area, using static orthogonalization as leakage correction. K-means clustering was used to segregate spatio-spectral clusters of resting-state functional connectivity (rsFC). Remarkably, unlike other RSNs, within-frequency long-range rsFC from the left Broca's area was not driven by one main carrying frequency but was characterized by a specific spatio-spectral pattern segregated along the ventral (predominantly θ and α) and dorsal (β and low-γ bands) vLN streams. In contrast, spatial patterns of cross-frequency vLN functional integration were spectrally more widespread and involved multiple frequency bands. Moreover, the static intrinsic functional architecture of the neuromagnetic human vLN involved clearly left-hemisphere-dominant vLN interactions as well as cross-network interactions with the executive control network and postero-medial nodes of the DMN. Overall, this study highlighted the involvement of multiple modes of within and cross-frequency power envelope couplings at the basis of long-range electrophysiological vLN functional integration. As such, it lays the foundation for future works aimed at understanding the pathophysiology of language-related disorders.
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Affiliation(s)
- Tim Coolen
- Laboratoire de Cartographie fonctionnelle du Cerveau, ULB Neuroscience Institute (UNI), Université libre de Bruxelles (ULB), Brussels, Belgium.,Department of Radiology, CUB-Hôpital Erasme, Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Vincent Wens
- Laboratoire de Cartographie fonctionnelle du Cerveau, ULB Neuroscience Institute (UNI), Université libre de Bruxelles (ULB), Brussels, Belgium.,Magnetoencenphalography Unit, Department of Functional Neuroimaging, Service of Nuclear Medicine, CUB-Hôpital Erasme, Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Marc Vander Ghinst
- Laboratoire de Cartographie fonctionnelle du Cerveau, ULB Neuroscience Institute (UNI), Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Alison Mary
- Neuropsychology & Functional Neuroimaging Research Unit (UR2NF), Center for Research in Cognition and Neurosciences, ULB-Neuroscience Institute (UNI), Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Mathieu Bourguignon
- Laboratoire de Cartographie fonctionnelle du Cerveau, ULB Neuroscience Institute (UNI), Université libre de Bruxelles (ULB), Brussels, Belgium.,BCBL-Basque Center on Cognition, Brain and Language, San Sebastian, Spain.,Laboratoire Cognition Langage et Développement, ULB Neuroscience Institute (UNI), Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Gilles Naeije
- Laboratoire de Cartographie fonctionnelle du Cerveau, ULB Neuroscience Institute (UNI), Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Philippe Peigneux
- Neuropsychology & Functional Neuroimaging Research Unit (UR2NF), Center for Research in Cognition and Neurosciences, ULB-Neuroscience Institute (UNI), Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Niloufar Sadeghi
- Department of Radiology, CUB-Hôpital Erasme, Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Serge Goldman
- Laboratoire de Cartographie fonctionnelle du Cerveau, ULB Neuroscience Institute (UNI), Université libre de Bruxelles (ULB), Brussels, Belgium.,Magnetoencenphalography Unit, Department of Functional Neuroimaging, Service of Nuclear Medicine, CUB-Hôpital Erasme, Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Xavier De Tiège
- Laboratoire de Cartographie fonctionnelle du Cerveau, ULB Neuroscience Institute (UNI), Université libre de Bruxelles (ULB), Brussels, Belgium.,Magnetoencenphalography Unit, Department of Functional Neuroimaging, Service of Nuclear Medicine, CUB-Hôpital Erasme, Université libre de Bruxelles (ULB), Brussels, Belgium
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Borghesani V, Buiatti M, Eger E, Piazza M. Conceptual and Perceptual Dimensions of Word Meaning Are Recovered Rapidly and in Parallel during Reading. J Cogn Neurosci 2019; 31:95-108. [DOI: 10.1162/jocn_a_01328] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
A single word (the noun “ elephant”) encapsulates a complex multidimensional meaning, including both perceptual (“ big”, “ gray”, “ trumpeting”) and conceptual (“ mammal”, “ can be found in India”) features. Opposing theories make different predictions as to whether different features (also conceivable as dimensions of the semantic space) are stored in similar neural regions and recovered with similar temporal dynamics during word reading. In this magnetoencephalography study, we tracked the brain activity of healthy human participants while reading single words varying orthogonally across three semantic dimensions: two perceptual ones (i.e., the average implied real-world size and the average strength of association with a prototypical sound) and a conceptual one (i.e., the semantic category). The results indicate that perceptual and conceptual representations are supported by partially segregated neural networks: Whereas visual and auditory dimensions are encoded in the phase coherence of low-frequency oscillations of occipital and superior temporal regions, respectively, semantic features are encoded in the power of low-frequency oscillations of anterior temporal and inferior parietal areas. However, despite the differences, these representations appear to emerge at the same latency: around 200 msec after stimulus onset. Taken together, these findings suggest that perceptual and conceptual dimensions of the semantic space are recovered automatically, rapidly, and in parallel during word reading.
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Affiliation(s)
- Valentina Borghesani
- Université Pierre et Marie Curie, Paris, France
- Institut National de la Santé et de la Recherche Médicale, Gif/Yvette, France
- University of California, San Francisco
- Center for Mind/Brain Sciences, University of Trento, Rovereto, Italy
| | - Marco Buiatti
- Institut National de la Santé et de la Recherche Médicale, Gif/Yvette, France
- Center for Mind/Brain Sciences, University of Trento, Rovereto, Italy
| | - Evelyn Eger
- Institut National de la Santé et de la Recherche Médicale, Gif/Yvette, France
| | - Manuela Piazza
- Institut National de la Santé et de la Recherche Médicale, Gif/Yvette, France
- Center for Mind/Brain Sciences, University of Trento, Rovereto, Italy
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Cooney C, Folli R, Coyle D. Neurolinguistics Research Advancing Development of a Direct-Speech Brain-Computer Interface. iScience 2018; 8:103-125. [PMID: 30296666 PMCID: PMC6174918 DOI: 10.1016/j.isci.2018.09.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Revised: 09/04/2018] [Accepted: 09/18/2018] [Indexed: 01/09/2023] Open
Abstract
A direct-speech brain-computer interface (DS-BCI) acquires neural signals corresponding to imagined speech, then processes and decodes these signals to produce a linguistic output in the form of phonemes, words, or sentences. Recent research has shown the potential of neurolinguistics to enhance decoding approaches to imagined speech with the inclusion of semantics and phonology in experimental procedures. As neurolinguistics research findings are beginning to be incorporated within the scope of DS-BCI research, it is our view that a thorough understanding of imagined speech, and its relationship with overt speech, must be considered an integral feature of research in this field. With a focus on imagined speech, we provide a review of the most important neurolinguistics research informing the field of DS-BCI and suggest how this research may be utilized to improve current experimental protocols and decoding techniques. Our review of the literature supports a cross-disciplinary approach to DS-BCI research, in which neurolinguistics concepts and methods are utilized to aid development of a naturalistic mode of communication.
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Affiliation(s)
- Ciaran Cooney
- Intelligent Systems Research Centre, Ulster University, Derry, UK.
| | - Raffaella Folli
- Institute for Research in Social Sciences, Ulster University, Jordanstown, UK
| | - Damien Coyle
- Intelligent Systems Research Centre, Ulster University, Derry, UK
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7
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Kagitani-Shimono K, Kato Y, Hanaie R, Matsuzaki J, Tanigawa J, Iwatani Y, Azuma J, Taniike M. Abnormal cortical activation during an auditory word comprehension task in benign childhood epilepsy with centrotemporal spikes: A magnetoencephalographic study. Epilepsy Behav 2018; 87:159-166. [PMID: 30120072 DOI: 10.1016/j.yebeh.2018.05.035] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 05/06/2018] [Accepted: 05/20/2018] [Indexed: 12/23/2022]
Abstract
OBJECTIVE Benign childhood epilepsy with centrotemporal spikes (BECTS), also known as rolandic epilepsy, has recently been reported to be associated with variable degrees of cognitive dysfunction. Many studies reported poor language ability in children with BECTS compared with healthy control children. To elucidate the harmful effects of BECTS on language cognition, we studied the magnetoencephalographic activity elicited by an auditory language comprehension task. METHODS The participants (N = 20) included 10 children diagnosed with BECTS (aged 10.8 ± 2.8 years) and 10 age-matched healthy children (control) (aged 10.6 ± 1.6 years). Cognitive function was assessed using general intellectual function and language ability. In patients with BECTS, we reviewed the clinical course and electroencephalogram (EEG) findings. We recorded the cortical responses elicited by an auditory language comprehension task using magnetoencephalography (MEG). We compared those results between groups and analyzed the correlation with cognitive scores and frequency of spikes. RESULTS The full-scale intelligence quotient (FSIQ) by the Wechsler Intelligence Scale for Children-4th edition was significantly reduced in the group with BECTS (96.4 ± 12.3) compared with the control group (110.0 ± 7.4). In half of the group with BECTS, the auditory comprehension score fell below the age-standard level. In the group with BECTS, the cortical activation during the task showed reduced intensity in language-associated areas such as the bilateral primary auditory cortex, left superior and mid-temporal areas, and inferior frontal area compared with those in the control group. In addition, the cortical activation in the left superior temporal area was negatively correlated with spike frequency and positively correlated with FSIQ in the group with BECTS. Conversely, the right inferior frontal and mid-temporal areas had increased the activations in the group with BECTS. From the time frequency analysis, low gamma band event-related desynchronization was reduced in the group with BECTS. CONCLUSION Epileptic spikes negatively influenced responsiveness to the auditory language comprehension task in the language-associated cortices. These findings suggest that epileptic spikes could have a negative impact on the functional activity in rolandic areas and become a reason to change the functional development of the language network.
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Affiliation(s)
- Kuriko Kagitani-Shimono
- Division of Developmental Neuroscience, United Graduate School of Child Development, Osaka University, Suita, Osaka, Japan; Department of Pediatrics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan; Epilepsy center, Osaka University Hospital, Suita, Osaka, Japan.
| | - Yoko Kato
- Division of Developmental Neuroscience, United Graduate School of Child Development, Osaka University, Suita, Osaka, Japan
| | - Ryuzo Hanaie
- Division of Developmental Neuroscience, United Graduate School of Child Development, Osaka University, Suita, Osaka, Japan
| | - Junko Matsuzaki
- Division of Developmental Neuroscience, United Graduate School of Child Development, Osaka University, Suita, Osaka, Japan
| | - Junpei Tanigawa
- Department of Pediatrics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Yoshiko Iwatani
- Division of Developmental Neuroscience, United Graduate School of Child Development, Osaka University, Suita, Osaka, Japan; Department of Pediatrics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan; Epilepsy center, Osaka University Hospital, Suita, Osaka, Japan
| | | | - Masako Taniike
- Division of Developmental Neuroscience, United Graduate School of Child Development, Osaka University, Suita, Osaka, Japan; Department of Pediatrics, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
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Global field synchronization of 40 Hz auditory steady-state response: Does it change with attentional demands? Neurosci Lett 2018; 674:127-131. [PMID: 29559420 DOI: 10.1016/j.neulet.2018.03.033] [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: 12/22/2017] [Revised: 03/15/2018] [Accepted: 03/16/2018] [Indexed: 11/23/2022]
Abstract
Auditory steady-state responses (ASSRs) are increasingly used in research of neuropsychiatric disorders and for brain-computer interface applications. However, results on attentional modulation of ASSRs are inconclusive. The evaluation of large-scale effects of task-related modulation on ASSRs might give better estimation of the induced changes. The aim of the study was to test global field synchronization - a reference-independent evaluation of the amount of phase-locking among all active regions at a given frequency - during tasks differing in attentional demands to 40 Hz auditory stimulation. Twenty seven healthy young males participated in the EEG study with concurrent 40 Hz binaural click stimulation and three experimental tasks: 1) to count presented stimuli (focused attention); 2) to silently read a text (distraction); 3) to stay awake with closed eyes (resting). We showed that during auditory 40 Hz stimulation, the global field synchronization of the EEG increased as compared to the silent baseline period and the largest increase was observed when subjects counted stimuli or rested with closed eyes. Our results provide insights that depending on the method of assessment, the 40 Hz ASSR might be an indicator of both local and complex synchronization processes that are affected by the state (task performed or psychopathology) of the participants.
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10
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Non-invasive detection of language-related prefrontal high gamma band activity with beamforming MEG. Sci Rep 2017; 7:14262. [PMID: 29079768 PMCID: PMC5660237 DOI: 10.1038/s41598-017-14452-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 10/11/2017] [Indexed: 12/14/2022] Open
Abstract
High gamma band (>50 Hz) activity is a key oscillatory phenomenon of brain activation. However, there has not been a non-invasive method established to detect language-related high gamma band activity. We used a 160-channel whole-head magnetoencephalography (MEG) system equipped with superconducting quantum interference device (SQUID) gradiometers to non-invasively investigate neuromagnetic activities during silent reading and verb generation tasks in 15 healthy participants. Individual data were divided into alpha (8–13 Hz), beta (13–25 Hz), low gamma (25–50 Hz), and high gamma (50–100 Hz) bands and analysed with the beamformer method. The time window was consecutively moved. Group analysis was performed to delineate common areas of brain activation. In the verb generation task, transient power increases in the high gamma band appeared in the left middle frontal gyrus (MFG) at the 550–750 ms post-stimulus window. We set a virtual sensor on the left MFG for time-frequency analysis, and high gamma event-related synchronization (ERS) induced by a verb generation task was demonstrated at 650 ms. In contrast, ERS in the high gamma band was not detected in the silent reading task. Thus, our study successfully non-invasively measured language-related prefrontal high gamma band activity.
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11
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Sugata H, Hirata M, Tamura Y, Onishi H, Goto T, Araki T, Yorifuji S. Frequency-dependent oscillatory neural profiles during imitation. Sci Rep 2017; 7:45806. [PMID: 28393878 PMCID: PMC5385530 DOI: 10.1038/srep45806] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 03/06/2017] [Indexed: 11/21/2022] Open
Abstract
Imitation is a complex process that includes higher-order cognitive and motor function. This process requires an observation-execution matching system that transforms an observed action into an identical movement. Although the low-gamma band is thought to reflect higher cognitive processes, no studies have focused on it. Here, we used magnetoencephalography (MEG) to examine the neural oscillatory changes including the low-gamma band during imitation. Twelve healthy, right-handed participants performed a finger task consisting of four conditions (imitation, execution, observation, and rest). During the imitation and execution conditions, significant event-related desynchronizations (ERDs) were observed at the left frontal, central, and parietal MEG sensors in the alpha, beta, and low-gamma bands. Functional connectivity analysis at the sensor level revealed an imitation-related connectivity between a group of frontal sensors and a group of parietal sensors in the low-gamma band. Furthermore, source reconstruction with synthetic aperture magnetometry showed significant ERDs in the low-gamma band in the left sensorimotor area and the middle frontal gyrus (MFG) during the imitation condition when compared with the other three conditions. Our results suggest that the oscillatory neural activities of the low-gamma band at the sensorimotor area and MFG play an important role in the observation-execution matching system related to imitation.
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Affiliation(s)
- Hisato Sugata
- Department of Neurosurgery, Osaka University Medical School, 2-2 E6 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Faculty of Welfare and Health Science, Oita University, 700 Dannoharu, Oita, 870-1192, Japan
| | - Masayuki Hirata
- Department of Neurosurgery, Osaka University Medical School, 2-2 E6 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Endowed Research Department of Clinical Neuroengineering, Global Center for Medical Engineering and Informatics, Osaka University, Suita, Osaka, Japan
| | - Yuichi Tamura
- Division of Functional Diagnostic Science, Osaka University Graduate School of Medicine, 1-7 Yamadaka, Suita, Osaka, 565-0871, Japan
| | - Hisao Onishi
- Department of Occupational Therapy, Osaka Prefecture University, 3-7-30 Habikino, Habikino, Osaka, 583-8555, Japan
| | - Tetsu Goto
- Department of Neurosurgery, Osaka University Medical School, 2-2 E6 Yamadaoka, Suita, Osaka, 565-0871, Japan.,Division of Functional Diagnostic Science, Osaka University Graduate School of Medicine, 1-7 Yamadaka, Suita, Osaka, 565-0871, Japan
| | - Toshihiko Araki
- Division of Functional Diagnostic Science, Osaka University Graduate School of Medicine, 1-7 Yamadaka, Suita, Osaka, 565-0871, Japan
| | - Shiro Yorifuji
- Division of Functional Diagnostic Science, Osaka University Graduate School of Medicine, 1-7 Yamadaka, Suita, Osaka, 565-0871, Japan
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Araki T, Hirata M, Yanagisawa T, Sugata H, Onishi M, Watanabe Y, Ogata S, Honda C, Hayakawa K, Yorifuji S. Language-related cerebral oscillatory changes are influenced equally by genetic and environmental factors. Neuroimage 2016; 142:241-247. [PMID: 27241483 DOI: 10.1016/j.neuroimage.2016.05.066] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Revised: 05/14/2016] [Accepted: 05/26/2016] [Indexed: 12/12/2022] Open
Abstract
Twin studies have suggested that there are genetic influences on inter-individual variation in terms of verbal abilities, and candidate genes have been identified by genome-wide association studies. However, the brain activities under genetic influence during linguistic processing remain unclear. In this study, we investigated neuromagnetic activities during a language task in a group of 28 monozygotic (MZ) and 12 dizygotic (DZ) adult twin pairs. We examined the spatio-temporal distribution of the event-related desynchronizations (ERDs) in the low gamma band (25-50Hz) using beamformer analyses and time-frequency analyses. Heritability was evaluated by comparing the respective MZ and DZ correlations. The genetic and environmental contributions were then estimated by structural equation modeling (SEM). We found that the peaks of the low gamma ERDs were localized to the left frontal area. The power of low gamma ERDs in this area exhibited higher similarity between MZ twins than that between DZ twins. SEM estimated the genetic contribution as approximately 50%. In addition, these powers were negatively correlated with the behavioral verbal scores. These results improve our understanding of how genetic and environmental factors influence cerebral activities during linguistic processes.
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Affiliation(s)
- Toshihiko Araki
- Division of Health Sciences, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan; Department of Medical Technology, Osaka University Hospital, Suita, Osaka 565-0871, Japan
| | - Masayuki Hirata
- Division of Health Sciences, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan; Department of Neurosurgery, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan.
| | - Takufumi Yanagisawa
- Division of Health Sciences, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan; Department of Neurosurgery, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
| | - Hisato Sugata
- Department of Neurosurgery, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan; Faculty of Welfare and Health Science, Oita University, Dannoharu, Oita, Japan
| | - Mai Onishi
- Division of Health Sciences, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
| | - Yoshiyuki Watanabe
- Department of Diagnostic and Interventional Radiology, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
| | - Soshiro Ogata
- Department of Health Promotion Science, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan; Research Fellow of Japan Society for the Promotion of Science, Japan
| | - Chika Honda
- Center for Twin Research, Osaka University Medical School, Suita, Osaka 565-0871, Japan
| | - Kazuo Hayakawa
- Mie Prefectural College of Nursing, Tsu, Mie 514-0116, Japan
| | - Shiro Yorifuji
- Division of Health Sciences, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
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13
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Hasegawa C, Ikeda T, Yoshimura Y, Hiraishi H, Takahashi T, Furutani N, Hayashi N, Minabe Y, Hirata M, Asada M, Kikuchi M. Mu rhythm suppression reflects mother-child face-to-face interactions: a pilot study with simultaneous MEG recording. Sci Rep 2016; 6:34977. [PMID: 27721481 PMCID: PMC5056356 DOI: 10.1038/srep34977] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 09/21/2016] [Indexed: 11/09/2022] Open
Abstract
Spontaneous face-to-face interactions between mothers and their children play crucial roles in the development of social minds; however, these inter-brain dynamics are still unclear. In this pilot study, we measured MEG mu suppression during face-to-face spontaneous non-linguistic interactions between mothers and their children with autism spectrum disorder (ASD) using the MEG hyperscanning system (i.e., simultaneous recording). The results demonstrated significant correlations between the index of mu suppression (IMS) in the right precentral area and the traits (or severity) of ASD in 13 mothers and 8 children (MEG data from 5 of the children could not be obtained due to motion noise). In addition, higher IMS values (i.e., strong mu suppression) in mothers were associated with higher IMS values in their children. To evaluate the behavioral contingency between mothers and their children, we calculated cross correlations between the magnitude of the mother and child head-motion during MEG recordings. As a result, in mothers whose head motions tended to follow her child's head motion, the magnitudes of mu suppression in the mother's precentral area were large. Further studies with larger sample sizes, including typically developing children, are necessary to generalize this result to typical interactions between mothers and their children.
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Affiliation(s)
- Chiaki Hasegawa
- Research Center for Child Mental Development, Kanazawa University, Kanazawa 920-8640, Japan
| | - Takashi Ikeda
- Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, Suita, 565-0871, Japan.,Department of Neurosurgery, Osaka University Medical School, Suita, 565-0871, Japan
| | - Yuko Yoshimura
- Research Center for Child Mental Development, Kanazawa University, Kanazawa 920-8640, Japan
| | - Hirotoshi Hiraishi
- Research Center for Child Mental Development, Kanazawa University, Kanazawa 920-8640, Japan
| | - Tetsuya Takahashi
- Research Center for Child Mental Development, Kanazawa University, Kanazawa 920-8640, Japan.,Department of Psychiatry and Neurobiology, Graduate School of Medical Science, Kanazawa University, Kanazawa 920-8641, Japan
| | - Naoki Furutani
- Department of Psychiatry and Neurobiology, Graduate School of Medical Science, Kanazawa University, Kanazawa 920-8641, Japan
| | - Norio Hayashi
- School of Radiological Technology, Gunma Prefectural College of Health Sciences, Maebashi, 371-0052, Japan
| | - Yoshio Minabe
- Research Center for Child Mental Development, Kanazawa University, Kanazawa 920-8640, Japan.,Department of Psychiatry and Neurobiology, Graduate School of Medical Science, Kanazawa University, Kanazawa 920-8641, Japan
| | - Masayuki Hirata
- Department of Neurosurgery, Osaka University Medical School, Suita, 565-0871, Japan
| | - Minoru Asada
- Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, Suita, 565-0871, Japan
| | - Mitsuru Kikuchi
- Research Center for Child Mental Development, Kanazawa University, Kanazawa 920-8640, Japan.,Department of Psychiatry and Neurobiology, Graduate School of Medical Science, Kanazawa University, Kanazawa 920-8641, Japan
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14
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Combining Different Tools for EEG Analysis to Study the Distributed Character of Language Processing. COMPUTATIONAL INTELLIGENCE AND NEUROSCIENCE 2015; 2015:865974. [PMID: 26713089 PMCID: PMC4680108 DOI: 10.1155/2015/865974] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 08/02/2015] [Accepted: 08/16/2015] [Indexed: 11/23/2022]
Abstract
Recent studies on language processing indicate that language cognition is better understood if assumed to be supported by a distributed intelligent processing system enrolling neurons located all over the cortex, in contrast to reductionism that proposes to localize cognitive functions to specific cortical structures. Here, brain activity was recorded using electroencephalogram while volunteers were listening or reading small texts and had to select pictures that translate meaning of these texts. Several techniques for EEG analysis were used to show this distributed character of neuronal enrollment associated with the comprehension of oral and written descriptive texts. Low Resolution Tomography identified the many different sets (si) of neurons activated in several distinct cortical areas by text understanding. Linear correlation was used to calculate the information H(ei) provided by each electrode of the 10/20 system about the identified si. H(ei) Principal Component Analysis (PCA) was used to study the temporal and spatial activation of these sources si. This analysis evidenced 4 different patterns of H(ei) covariation that are generated by neurons located at different cortical locations. These results clearly show that the distributed character of language processing is clearly evidenced by combining available EEG technologies.
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15
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Shinshi M, Yanagisawa T, Hirata M, Goto T, Sugata H, Araki T, Okamura Y, Hasegawa Y, Ihara AS, Yorifuji S. Temporospatial identification of language-related cortical function by a combination of transcranial magnetic stimulation and magnetoencephalography. Brain Behav 2015; 5:e00317. [PMID: 25642395 PMCID: PMC4309891 DOI: 10.1002/brb3.317] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 12/15/2014] [Accepted: 12/20/2014] [Indexed: 11/26/2022] Open
Abstract
INTRODUCTION Identification of language-related cortical functions can be carried out noninvasively by transcranial magnetic stimulation (TMS) and magnetoencephalography (MEG), which allow for lesion-based interrogation and global temporospatial investigation of cortices, respectively. Combining these two modalities can improve the accuracy of the identification, but the relationships between them remain unclear. We compared TMS and MEG responses during the same language task to elucidate their temporospatial relationships and used the results to develop a novel method to identify language-related cortical functions. METHODS Twelve healthy right-handed volunteers performed a picture-naming task during TMS and MEG. TMS was applied on the right or left inferior frontal gyrus (IFG) at five time points, and the reaction times (RTs) for naming the pictures were measured. The temporospatial oscillatory changes measured by MEG during the same task were then compared with the TMS results. RESULTS Transcranial magnetic stimulation of the left IFG significantly lengthened RTs at 300 and 375 msec after picture presentation, whereas TMS of the right IFG did not change RTs significantly. Interestingly, the stimulus time point at which RTs increased significantly for each individual was correlated with when the low gamma event-related desynchronizations (ERDs) peaked in the left IFG. Moreover, combining the results of TMS and MEG improved the detection rate for identifying the laterality of language function. CONCLUSIONS These results suggest that the low gamma ERDs measured by MEG strongly relate to the language function of picture naming in the left IFG. Finally, we propose a novel method to identify language-related cortical functions by combining TMS and MEG.
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Affiliation(s)
- Misako Shinshi
- Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine Osaka, Japan
| | - Takufumi Yanagisawa
- Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine Osaka, Japan ; Department of Neurosurgery, Osaka University Graduate School of Medicine Suita, Japan
| | - Masayuki Hirata
- Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine Osaka, Japan ; Department of Neurosurgery, Osaka University Graduate School of Medicine Suita, Japan
| | - Tetsu Goto
- Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine Osaka, Japan ; Department of Neurosurgery, Osaka University Graduate School of Medicine Suita, Japan
| | - Hisato Sugata
- Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine Osaka, Japan ; Department of Neurosurgery, Osaka University Graduate School of Medicine Suita, Japan
| | - Toshihiko Araki
- Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine Osaka, Japan
| | - Yumiko Okamura
- Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine Osaka, Japan
| | - Yuka Hasegawa
- Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine Osaka, Japan
| | - Aya S Ihara
- Center for Information and Neural Networks (CiNet), National Institute of Information and Communications Technology, and Osaka University Kobe, Japan
| | - Shiro Yorifuji
- Department of Functional Diagnostic Science, Osaka University Graduate School of Medicine Osaka, Japan
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16
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Resnik K, Bradbury D, Barnes GR, Leff AP. Between Thought and Expression, a Magnetoencephalography Study of the “Tip-of-the-Tongue” Phenomenon. J Cogn Neurosci 2014; 26:2210-23. [DOI: 10.1162/jocn_a_00611] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Abstract
“Tip-of-the-tongue” (TOT) is the phenomenon associated with the inaccessibility of a known word from memory. It is universally experienced, increases in frequency with age, and is most common for proper nouns. It is a good model for the symptom of anomia experienced much more frequently by some aphasic patients following brain injury. Here, we induced the TOT state in older participants while they underwent brain scanning with magnetoencephalography to investigate the changes in oscillatory brain activity associated with failed retrieval of known words. Using confrontation naming of pictures of celebrities, we successfully induced the TOT state in 29% of trials and contrasted it with two other states: “Know” where the participants both correctly recognized the celebrity's face and retrieved their name and “Don't Know” when the participants did not recognize the celebrity. We wished to test Levelt's influential model of speech output by carrying out two analyses, one epoching the data to the point in time when the picture was displayed and the other looking back in time from when the participants first articulated their responses. Our main findings supported the components of Levelt's model, but not their serial activation over time as both semantic and motor areas were identified in both analyses. We also found enduring decreases in the alpha frequency band in the left ventral temporal region during the TOT state, suggesting ongoing semantic search. Finally, we identified reduced beta power in classical peri-sylvian language areas for the TOT condition, suggesting that brain regions that encode linguistic memories are also involved in their attempted retrieval.
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17
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Oh A, Vidal J, Taylor MJ, Pang EW. Neuromagnetic correlates of intra- and extra-dimensional set-shifting. Brain Cogn 2014; 86:90-7. [DOI: 10.1016/j.bandc.2014.02.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 01/22/2014] [Accepted: 02/12/2014] [Indexed: 11/28/2022]
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18
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Ikeda S, Shibata T, Nakano N, Okada R, Tsuyuguchi N, Ikeda K, Kato A. Neural decoding of single vowels during covert articulation using electrocorticography. Front Hum Neurosci 2014; 8:125. [PMID: 24639642 PMCID: PMC3945950 DOI: 10.3389/fnhum.2014.00125] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Accepted: 02/19/2014] [Indexed: 11/13/2022] Open
Abstract
The human brain has important abilities for manipulating phonemes, the basic building blocks of speech; these abilities represent phonological processing. Previous studies have shown change in the activation levels of broad cortical areas such as the premotor cortex, the inferior frontal gyrus, and the superior temporal gyrus during phonological processing. However, whether these areas actually convey signals to representations related to individual phonemes remains unclear. This study focused on single vowels and investigated cortical areas important for representing single vowels using electrocorticography (ECoG) during covert articulation. To identify such cortical areas, we used a neural decoding approach in which machine learning models identify vowels. A decoding model was trained on the ECoG signals from individual electrodes placed on the subjects' cortices. We then statistically evaluated whether each decoding model showed accurate identification of vowels, and we found cortical areas such as the premotor cortex and the superior temporal gyrus. These cortical areas were consistent with previous findings. On the other hand, no electrodes over Broca's area showed significant decoding accuracies. This was inconsistent with findings from a previous study showing that vowels within the phonemic sequence of words can be decoded using ECoG signals from Broca's area. Our results therefore suggest that Broca's area is involved in the processing of vowels within phonemic sequences, but not in the processing of single vowels.
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Affiliation(s)
- Shigeyuki Ikeda
- Graduate School of Information Science, Nara Institute of Science and Technology Ikoma, Japan
| | - Tomohiro Shibata
- Graduate School of Information Science, Nara Institute of Science and Technology Ikoma, Japan ; Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology Kitakyushu, Japan
| | - Naoki Nakano
- Department of Neurosurgery, Kinki University Faculty of Medicine Sayama, Japan
| | - Rieko Okada
- Department of Neurosurgery, Kinki University Faculty of Medicine Sayama, Japan
| | - Naohiro Tsuyuguchi
- Department of Neurosurgery, Graduate School of Medicine, Osaka City University Osaka, Japan
| | - Kazushi Ikeda
- Graduate School of Information Science, Nara Institute of Science and Technology Ikoma, Japan
| | - Amami Kato
- Department of Neurosurgery, Kinki University Faculty of Medicine Sayama, Japan ; Core Research for Evolutionary Science and Technology, Japan Science and Technology Agency Kawaguchi, Japan
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19
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Hirata M, Ikeda T, Kikuchi M, Kimura T, Hiraishi H, Yoshimura Y, Asada M. Hyperscanning MEG for understanding mother-child cerebral interactions. Front Hum Neurosci 2014; 8:118. [PMID: 24624076 PMCID: PMC3941301 DOI: 10.3389/fnhum.2014.00118] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Accepted: 02/17/2014] [Indexed: 11/13/2022] Open
Abstract
Child development is seriously affected by social interactions with caregivers, which may lead to forming social minds in our daily life afterward. However, the underlying neural mechanism for such interactions has not yet been revealed. This article introduces a magnetoencephalographic (MEG) hyperscanning system to examine brain-to-brain interactions between a mother and her child. We used two whole-head MEG systems placed in the same magnetically-shielded room. One is a 160-channel gradiometer system for an adult and the other is a 151-channel gradiometer system for a child. We developed an audio-visual presentation system, which enabled a mother and her child to look at each other in real time. In each MEG system, a video camera was placed behind a half-mirror screen for visual presentation to obtain the subjects' facial expressions. The visual presentation system is capable of displaying not only real-time facial expression but also processed facial expression such as a still face or delayed facial expressions. A projector system displays the side-by-side face images of the mother and child, and the images are divided into each face using splitting mirrors and each face is displayed on the half-mirror screen in front of the other subject. To the best of our knowledge, our system is the first MEG hyperscanning system in a single shielded room, and may contribute to elucidating brain-to-brain interactions not only between a mother and her child but also in general inter-individual, brain-to-brain interactions.
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Affiliation(s)
- Masayuki Hirata
- Department of Neurosurgery, Osaka University Medical School Suita, Japan
| | - Takashi Ikeda
- Department of Neurosurgery, Osaka University Medical School Suita, Japan ; Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University Suita, Japan
| | - Mitsuru Kikuchi
- Research Center for Child Mental Development, Graduate School of Medical Science, Kanazawa University Kanazawa, Japan
| | | | - Hirotoshi Hiraishi
- Research Center for Child Mental Development, Graduate School of Medical Science, Kanazawa University Kanazawa, Japan
| | - Yuko Yoshimura
- Research Center for Child Mental Development, Graduate School of Medical Science, Kanazawa University Kanazawa, Japan
| | - Minoru Asada
- Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University Suita, Japan
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20
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Pammer K. Temporal sampling in vision and the implications for dyslexia. Front Hum Neurosci 2014; 7:933. [PMID: 24596549 PMCID: PMC3925989 DOI: 10.3389/fnhum.2013.00933] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 12/23/2013] [Indexed: 11/17/2022] Open
Abstract
It has recently been suggested that dyslexia may manifest as a deficit in the neural synchrony underlying language-based codes (Goswami, 2011), such that the phonological deficits apparent in dyslexia occur as a consequence of poor synchronisation of oscillatory brain signals to the sounds of language. There is compelling evidence to support this suggestion, and it provides an intriguing new development in understanding the aetiology of dyslexia. It is undeniable that dyslexia is associated with poor phonological coding, however, reading is also a visual task, and dyslexia has also been associated with poor visual coding, particularly visuo-spatial sensitivity. It has been hypothesized for some time that specific frequency oscillations underlie visual perception. Although little research has been done looking specifically at dyslexia and cortical frequency oscillations, it is possible to draw on converging evidence from visual tasks to speculate that similar deficits could occur in temporal frequency oscillations in the visual domain in dyslexia. Thus, here the plausibility of a visual correlate of the Temporal Sampling Framework is considered, leading to specific hypotheses and predictions for future research. A common underlying neural mechanism in dyslexia, may subsume qualitatively different manifestations of reading difficulty, which is consistent with the heterogeneity of the disorder, and may open the door for a new generation of exciting research.
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Affiliation(s)
- Kristen Pammer
- The Research School of Psychology, The Australian National University Canberra, ACT, Australia
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21
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Park JY, Lee KS, An SK, Lee J, Kim JJ, Kim KH, Namkoong K. Gamma oscillatory activity in relation to memory ability in older adults. Int J Psychophysiol 2012; 86:58-65. [PMID: 22906816 DOI: 10.1016/j.ijpsycho.2012.08.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Revised: 07/05/2012] [Accepted: 08/06/2012] [Indexed: 10/28/2022]
Abstract
Human gamma-band activity (GBA) is widely reported to reflect memory processing. Recent studies suggest that GBA is associated with behavioral performance in memory tasks, but it is not clear whether gamma oscillations are related to individual differences in memory ability. To examine this issue, we recruited participants with low memory ability (mild cognitive impairment, or MCI; n=16) as well as age-, education-, and sex-matched controls (n=19) for a study involving a spatial delayed match to sample (DMTS) task. We recorded EEG during task performance and analyzed gamma oscillation changes during the memory maintenance phase of the task. Gamma event-related desynchronization was stronger in the control group than in the MCI group in the mid-frontal area, and mean GBA in this area correlated with clinical memory measures as well as behavioral performance on the DMTS task. These findings suggest that gamma oscillations not only reflect brain activity related to memory processes, but also vary with the memory ability of individuals.
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Affiliation(s)
- Jin Young Park
- Department of Psychiatry, Yonsei University, College of Medicine, Seoul, Republic of Korea
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22
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Fujimoto T, Okumura E, Takeuchi K, Kodabashi A, Tanaka H, Otsubo T, Nakamura K, Sekine M, Kamiya S, Higashi Y, Tsuji M, Shimooki S, Tamura T. Changes in Event-Related Desynchronization and Synchronization during the Auditory Oddball Task in Schizophrenia Patients. Open Neuroimag J 2012; 6:26-36. [PMID: 22870167 PMCID: PMC3409351 DOI: 10.2174/1874440001206010026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Revised: 03/28/2012] [Accepted: 04/13/2012] [Indexed: 11/22/2022] Open
Abstract
Objective: We studied differences in the spatiotemporal dynamics of cortical oscillation across brain regions of patients with schizophrenia and normal subjects during the auditory oddball task using magnetoencephalography (MEG) and electroencephalography (EEG). Methods: Ten right-handed male schizophrenia patients were studied. We used a newly developed adaptive spatial filtering algorithm optimized for robust source time-frequency reconstruction of MEG and EEG data, and obtained consecutive images in functional maps of event-related desynchronization (ERD) and synchronization (ERS) in theta, lower alpha (8–10 Hz), upper alpha (10–13 Hz), and beta bands. Results: Beta ERD power at 750–1000 ms in patients was significantly increased in large right upper temporal and parietal regions and small upper portions of bilateral dorsal frontal and dorsal-medial parietal regions. Theta ERS power in schizophrenic patients during the oddball task was significantly increased in the left temporal pole at 250–500 ms, and was significantly increased in dorsal, medial frontal, and anterior portions of the anterior cingulate cortex in both hemispheres, and the left portion of lateral temporal regions at 500–750 ms, compared to the control group (family-wise error correction p<0.05). Lower alpha ERS power was significantly decreased in the right occipital region at 500–750 ms and in the right midline parietal and bilateral occipital regions at 750–1000 ms. Upper alpha ERS power was significantly decreased in right midline parietal and left occipital regions at 750–1000 ms. Conclusions: ERD/ERS changes were noted in the left temporal pole and midline frontal and anterior cingulate cortex in theta ERS, occipital lobe in alpha ERS, and right temporal-frontal-parietal, midline frontal, and anterior cingulate cortex in beta ERD. These findings may reflect disturbances in interaction among active large neuronal groups and their communication with each other that may be related to abnormal cognitive and psychopathological function. Significance: Study of ERD and ERS by time-frequency analyses using MEG is useful to clarify data processing dysfunction in schizophrenia.
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Affiliation(s)
- Toshiro Fujimoto
- Fujimoto Hayasuzu Hospital, Yokakai Association, Miyazaki, Japan
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