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Gonzalez JE, Nieto N, Brusco P, Gravano A, Kamienkowski JE. Speech-induced suppression during natural dialogues. Commun Biol 2024; 7:291. [PMID: 38459110 PMCID: PMC10923813 DOI: 10.1038/s42003-024-05945-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 02/21/2024] [Indexed: 03/10/2024] Open
Abstract
When engaged in a conversation, one receives auditory information from the other's speech but also from their own speech. However, this information is processed differently by an effect called Speech-Induced Suppression. Here, we studied brain representation of acoustic properties of speech in natural unscripted dialogues, using electroencephalography (EEG) and high-quality speech recordings from both participants. Using encoding techniques, we were able to reproduce a broad range of previous findings on listening to another's speech, and achieving even better performances when predicting EEG signal in this complex scenario. Furthermore, we found no response when listening to oneself, using different acoustic features (spectrogram, envelope, etc.) and frequency bands, evidencing a strong effect of SIS. The present work shows that this mechanism is present, and even stronger, during natural dialogues. Moreover, the methodology presented here opens the possibility of a deeper understanding of the related mechanisms in a wider range of contexts.
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Affiliation(s)
- Joaquin E Gonzalez
- Laboratorio de Inteligencia Artificial Aplicada, Instituto de Ciencias de la Computación (Universidad de Buenos Aires - Consejo Nacional de Investigaciones Cientificas y Tecnicas), Buenos Aires, Argentina.
| | - Nicolás Nieto
- Instituto de Investigación en Señales, Sistemas e Inteligencia Computacional, sinc(i) (Universidad Nacional del Litoral - Consejo Nacional de Investigaciones Cientificas y Tecnicas), Santa Fe, Argentina
- Instituto de Matemática Aplicada del Litoral, IMAL-UNL/CONICET, Santa Fe, Argentina
| | - Pablo Brusco
- Departamento de Computación, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Agustín Gravano
- Laboratorio de Inteligencia Artificial, Universidad Torcuato Di Tella, Buenos Aires, Argentina
- Escuela de Negocios, Universidad Torcuato Di Tella, Buenos Aires, Argentina
- Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Juan E Kamienkowski
- Laboratorio de Inteligencia Artificial Aplicada, Instituto de Ciencias de la Computación (Universidad de Buenos Aires - Consejo Nacional de Investigaciones Cientificas y Tecnicas), Buenos Aires, Argentina
- Departamento de Computación, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
- Maestria de Explotación de Datos y Descubrimiento del Conocimiento, Facultad de Ciencias Exactas y Naturales - Facultad de Ingenieria, Universidad de Buenos Aires, Buenos Aires, Argentina
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Moaveninejad S, D'Onofrio V, Tecchio F, Ferracuti F, Iarlori S, Monteriù A, Porcaro C. Fractal Dimension as a discriminative feature for high accuracy classification in motor imagery EEG-based brain-computer interface. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2024; 244:107944. [PMID: 38064955 DOI: 10.1016/j.cmpb.2023.107944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/31/2023] [Accepted: 11/24/2023] [Indexed: 01/26/2024]
Abstract
BACKGROUND AND OBJECTIVE The brain-computer interface (BCI) technology acquires human brain electrical signals, which can be effectively and successfully used to control external devices, potentially supporting subjects suffering from motor impairments in the interaction with the environment. To this aim, BCI systems must correctly decode and interpret neurophysiological signals reflecting the intention of the subjects to move. Therefore, the accurate classification of single events in motor tasks represents a fundamental challenge in ensuring efficient communication and control between users and BCIs. Movement-associated changes in electroencephalographic (EEG) sensorimotor rhythms, such as event-related desynchronization (ERD), are well-known features of discriminating motor tasks. Fractal dimension (FD) can be used to evaluate the complexity and self-similarity in brain signals, potentially providing complementary information to frequency-based signal features. METHODS In the present work, we introduce FD as a novel feature for subject-independent event classification, and we test several machine learning (ML) models in behavioural tasks of motor imagery (MI) and motor execution (ME). RESULTS Our results show that FD improves the classification accuracy of ML compared to ERD. Furthermore, unilateral hand movements have higher classification accuracy than bilateral movements in both MI and ME tasks. CONCLUSIONS These results provide further insights into subject-independent event classification in BCI systems and demonstrate the potential of FD as a discriminative feature for EEG signals.
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Affiliation(s)
| | | | - Franca Tecchio
- Institute of Cognitive Sciences and Technologies (ISCT) - National Research Council (CNR), 00185 Rome, Italy
| | - Francesco Ferracuti
- Department of Information Engineering, Università Politecnica delle Marche, 60131 Ancona, Italy
| | - Sabrina Iarlori
- Department of Information Engineering, Università Politecnica delle Marche, 60131 Ancona, Italy
| | - Andrea Monteriù
- Department of Information Engineering, Università Politecnica delle Marche, 60131 Ancona, Italy
| | - Camillo Porcaro
- Department of Neuroscience, University of Padova, 35128 Padua, Italy; Padova Neuroscience Center (PNC), University of Padova, 35131 Padua, Italy; Institute of Cognitive Sciences and Technologies (ISCT) - National Research Council (CNR), 00185 Rome, Italy; Centre for Human Brain Health, School of Psychology, University of Birmingham, Birmingham B15 2TT, UK.
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3
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Xie X, Chen L, Qin S, Zha F, Fan X. Bidirectional feature pyramid attention-based temporal convolutional network model for motor imagery electroencephalogram classification. Front Neurorobot 2024; 18:1343249. [PMID: 38352723 PMCID: PMC10861766 DOI: 10.3389/fnbot.2024.1343249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 01/15/2024] [Indexed: 02/16/2024] Open
Abstract
Introduction As an interactive method gaining popularity, brain-computer interfaces (BCIs) aim to facilitate communication between the brain and external devices. Among the various research topics in BCIs, the classification of motor imagery using electroencephalography (EEG) signals has the potential to greatly improve the quality of life for people with disabilities. Methods This technology assists them in controlling computers or other devices like prosthetic limbs, wheelchairs, and drones. However, the current performance of EEG signal decoding is not sufficient for real-world applications based on Motor Imagery EEG (MI-EEG). To address this issue, this study proposes an attention-based bidirectional feature pyramid temporal convolutional network model for the classification task of MI-EEG. The model incorporates a multi-head self-attention mechanism to weigh significant features in the MI-EEG signals. It also utilizes a temporal convolution network (TCN) to separate high-level temporal features. The signals are enhanced using the sliding-window technique, and channel and time-domain information of the MI-EEG signals is extracted through convolution. Results Additionally, a bidirectional feature pyramid structure is employed to implement attention mechanisms across different scales and multiple frequency bands of the MI-EEG signals. The performance of our model is evaluated on the BCI Competition IV-2a dataset and the BCI Competition IV-2b dataset, and the results showed that our model outperformed the state-of-the-art baseline model, with an accuracy of 87.5 and 86.3% for the subject-dependent, respectively. Discussion In conclusion, the BFATCNet model offers a novel approach for EEG-based motor imagery classification in BCIs, effectively capturing relevant features through attention mechanisms and temporal convolutional networks. Its superior performance on the BCI Competition IV-2a and IV-2b datasets highlights its potential for real-world applications. However, its performance on other datasets may vary, necessitating further research on data augmentation techniques and integration with multiple modalities to enhance interpretability and generalization. Additionally, reducing computational complexity for real-time applications is an important area for future work.
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Affiliation(s)
- Xinghe Xie
- Shenzhen Academy of Robotics, Shenzhen, Guangdong Province, China
- Faculty of Applied Science, Macao Polytechnic University, Macau, Macao SAR, China
| | - Liyan Chen
- Shenzhen Academy of Robotics, Shenzhen, Guangdong Province, China
| | - Shujia Qin
- Shenzhen Academy of Robotics, Shenzhen, Guangdong Province, China
| | - Fusheng Zha
- Harbin Institute of Technology, Harbin, Heilongjiang Province, China
| | - Xinggang Fan
- Information Engineering College, Zhijiang College of Zhejiang University of Technology, Shaoxing, China
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4
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Tecchio F, Giambattistelli F, Porcaro C, Cottone C, Mutanen TP, Pizzella V, Marzetti L, Ilmoniemi RJ, Vernieri F, Rossini PM. Effective Intracerebral Connectivity in Acute Stroke: A TMS-EEG Study. Brain Sci 2023; 13:brainsci13020233. [PMID: 36831776 PMCID: PMC9954230 DOI: 10.3390/brainsci13020233] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 01/19/2023] [Accepted: 01/21/2023] [Indexed: 01/31/2023] Open
Abstract
Stroke is a major cause of disability because of its motor and cognitive sequelae even when the acute phase of stabilization of vital parameters is overcome. The most important improvements occur in the first 8-12 weeks after stroke, indicating that it is crucial to improve our understanding of the dynamics of phenomena occurring in this time window to prospectively target rehabilitation procedures from the earliest stages after the event. Here, we studied the intracortical excitability properties of delivering transcranial magnetic stimulation (TMS) to the primary motor cortex (M1) of left and right hemispheres in 17 stroke patients who suffered a mono-lateral left hemispheric stroke, excluding pure cortical damage. All patients were studied within 10 days of symptom onset. TMS-evoked potentials (TEPs) were collected via a TMS-compatible electroencephalogram system (TMS-EEG) concurrently with motor-evoked responses (MEPs) induced in the contralateral first dorsal interosseous muscle. Comparison with age-matched healthy volunteers was made by collecting the same bilateral-stimulation data in nine healthy volunteers as controls. Excitability in the acute phase revealed relevant changes in the relationship between left lesioned and contralesionally right hemispheric homologous areas both for TEPs and MEPs. While the paretic hand displayed reduced MEPs compared to the non-paretic hand and to healthy volunteers, TEPs revealed an overexcitable lesioned hemisphere with respect to both healthy volunteers and the contra-lesion side. Our quantitative results advance the understanding of the impairment of intracortical inhibitory networks. The neuronal dysfunction most probably changes the excitatory/inhibitory on-center off-surround organization that supports already acquired learning and reorganization phenomena that support recovery from stroke sequelae.
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Affiliation(s)
- Franca Tecchio
- Laboratory of Electrophysiology for Translational Neuroscience (LET’S), Institute for Cognitive Sciences and Technologies (ISTC), National Research Council of Italy (CNR), 00185 Rome, Italy
- Correspondence: ; Fax: +39-339-490-1971
| | | | - Camillo Porcaro
- Laboratory of Electrophysiology for Translational Neuroscience (LET’S), Institute for Cognitive Sciences and Technologies (ISTC), National Research Council of Italy (CNR), 00185 Rome, Italy
- Department of Neuroscience and Padova Neuroscience Center (PNC), University of Padova, 35128 Padova, Italy
- Centre for Human Brain Health, School of Psychology, University of Birmingham, Birmingham B15 2TT, UK
| | - Carlo Cottone
- Laboratory of Electrophysiology for Translational Neuroscience (LET’S), Institute for Cognitive Sciences and Technologies (ISTC), National Research Council of Italy (CNR), 00185 Rome, Italy
| | - Tuomas P. Mutanen
- Laboratory of Electrophysiology for Translational Neuroscience (LET’S), Institute for Cognitive Sciences and Technologies (ISTC), National Research Council of Italy (CNR), 00185 Rome, Italy
- Department of Neuroscience and Biomedical Engineering, Aalto University School of Science, 00076 Espoo, Finland
- BioMag Laboratory, Helsinki University Hospital Medical Imaging Center, Helsinki University Hospital, Helsinki University and Aalto University School of Science, P.O. Box 340, FI-00029 HUS Helsinki, Finland
| | - Vittorio Pizzella
- Department of Neuroscience, Imaging and Clinical Sciences, University ‘G. d’Annunzio’ of Chieti-Pescara, 66100 Chieti, Italy
- Institute for Advanced Biomedical Technologies, University ‘G. d’Annunzio’ of Chieti-Pescara, 66100 Chieti, Italy
| | - Laura Marzetti
- Department of Neuroscience, Imaging and Clinical Sciences, University ‘G. d’Annunzio’ of Chieti-Pescara, 66100 Chieti, Italy
- Institute for Advanced Biomedical Technologies, University ‘G. d’Annunzio’ of Chieti-Pescara, 66100 Chieti, Italy
| | - Risto J. Ilmoniemi
- Department of Neuroscience and Biomedical Engineering, Aalto University School of Science, 00076 Espoo, Finland
- BioMag Laboratory, Helsinki University Hospital Medical Imaging Center, Helsinki University Hospital, Helsinki University and Aalto University School of Science, P.O. Box 340, FI-00029 HUS Helsinki, Finland
| | - Fabrizio Vernieri
- Department of Clinical Neurology, University Campus Bio-Medico, 00128 Rome, Italy
| | - Paolo Maria Rossini
- Laboratory of Brain Connectivity, Department of Neuroscience & Neurorehabilitation, IRCCS San Raffaele-Roma, 00163 Rome, Italy
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Piazza G, Martin CD, Kalashnikova M. The Acoustic Features and Didactic Function of Foreigner-Directed Speech: A Scoping Review. JOURNAL OF SPEECH, LANGUAGE, AND HEARING RESEARCH : JSLHR 2022; 65:2896-2918. [PMID: 35914012 DOI: 10.1044/2022_jslhr-21-00609] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
PURPOSE This scoping review considers the acoustic features of a clear speech register directed to nonnative listeners known as foreigner-directed speech (FDS). We identify vowel hyperarticulation and low speech rate as the most representative acoustic features of FDS; other features, including wide pitch range and high intensity, are still under debate. We also discuss factors that may influence the outcomes and characteristics of FDS. We start by examining accommodation theories, outlining the reasons why FDS is likely to serve a didactic function by helping listeners acquire a second language (L2). We examine how this speech register adapts to listeners' identities and linguistic needs, suggesting that FDS also takes listeners' L2 proficiency into account. To confirm the didactic function of FDS, we compare it to other clear speech registers, specifically infant-directed speech and Lombard speech. CONCLUSIONS Our review reveals that research has not yet established whether FDS succeeds as a didactic tool that supports L2 acquisition. Moreover, a complex set of factors determines specific realizations of FDS, which need further exploration. We conclude by summarizing open questions and indicating directions and recommendations for future research.
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Affiliation(s)
- Giorgio Piazza
- Basque Center on Cognition, Brain and Language (BCBL), Donostia-San Sebastián, Spain
- Department of Social Sciences and Law, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Donostia-San Sebastián, Spain
| | - Clara D Martin
- Basque Center on Cognition, Brain and Language (BCBL), Donostia-San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, Spain
| | - Marina Kalashnikova
- Basque Center on Cognition, Brain and Language (BCBL), Donostia-San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, Spain
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Egurtzegi A, Blasi DE, Bornkessel-Schlesewsky I, Laka I, Meyer M, Bickel B, Sauppe S. Cross-linguistic differences in case marking shape neural power dynamics and gaze behavior during sentence planning. BRAIN AND LANGUAGE 2022; 230:105127. [PMID: 35605312 DOI: 10.1016/j.bandl.2022.105127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 04/07/2022] [Accepted: 04/21/2022] [Indexed: 06/15/2023]
Abstract
Languages differ in how they mark the dependencies between verbs and arguments, e.g., by case. An eye tracking and EEG picture description study examined the influence of case marking on the time course of sentence planning in Basque and Swiss German. While German assigns an unmarked (nominative) case to subjects, Basque specifically marks agent arguments through ergative case. Fixations to agents and event-related synchronization (ERS) in the theta and alpha frequency bands, as well as desynchronization (ERD) in the alpha and beta bands revealed multiple effects of case marking on the time course of early sentence planning. Speakers decided on case marking under planning early when preparing sentences with ergative-marked agents in Basque, whereas sentences with unmarked agents allowed delaying structural commitment across languages. These findings support hierarchically incremental accounts of sentence planning and highlight how cross-linguistic differences shape the neural dynamics underpinning language use.
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Affiliation(s)
- Aitor Egurtzegi
- Department of Comparative Language Science, University of Zurich, Switzerland; Center for the Interdisciplinary Study of Language Evolution, University of Zurich, Switzerland; English Department, University of Zurich, Switzerland
| | - Damián E Blasi
- Department of Human Evolutionary Biology, Harvard University, United States; Department of Linguistic and Cultural Evolution, Max Planck Institute for Evolutionary Anthropology, Germany
| | - Ina Bornkessel-Schlesewsky
- School of Psychology, Social Work and Social Policy, University of South Australia, Australia; Cognitive and Systems Neuroscience Research Hub, University of South Australia, Australia
| | - Itziar Laka
- Department of Linguistics and Basque Studies, University of the Basque Country (UPV/EHU), Spain
| | - Martin Meyer
- Department of Comparative Language Science, University of Zurich, Switzerland; Center for the Interdisciplinary Study of Language Evolution, University of Zurich, Switzerland; Cognitive Psychology Unit, Psychological Institute, University of Klagenfurt, Austria
| | - Balthasar Bickel
- Department of Comparative Language Science, University of Zurich, Switzerland; Center for the Interdisciplinary Study of Language Evolution, University of Zurich, Switzerland
| | - Sebastian Sauppe
- Department of Comparative Language Science, University of Zurich, Switzerland; Center for the Interdisciplinary Study of Language Evolution, University of Zurich, Switzerland.
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Porcaro C, Marino M, Carozzo S, Russo M, Ursino M, Valentinaruggiero, Ragno C, Proto S, Tonin P. Fractal Dimension Feature as a Signature of Severity in Disorders of Consciousness: An EEG Study. Int J Neural Syst 2022; 32:2250031. [DOI: 10.1142/s0129065722500319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Porcaro C, Vecchio F, Miraglia F, Zito G, Rossini PM. Dynamics of the "Cognitive" Brain Wave P3b at Rest for Alzheimer Dementia Prediction in Mild Cognitive Impairment. Int J Neural Syst 2022; 32:2250022. [PMID: 35435134 DOI: 10.1142/s0129065722500228] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Alzheimer's disease (AD) is the most common cause of dementia that involves a progressive and irrevocable decline in cognitive abilities and social behavior, thus annihilating the patient's autonomy. The theoretical assumption that disease-modifying drugs are most effective in the early stages hopefully in the prodromal stage called mild cognitive impairment (MCI) urgently pushes toward the identification of robust and individualized markers of cognitive decline to establish an early pharmacological intervention. This requires the combination of well-established neural mechanisms and the development of increasingly sensitive methodologies. Among the neurophysiological markers of attention and cognition, one of the sub-components of the 'cognitive brain wave' P300 recordable in an odd-ball paradigm -namely the P3b- is extensively regarded as a sensitive indicator of cognitive performance. Several studies have reliably shown that changes in the amplitude and latency of the P3b are strongly related to cognitive decline and aging both healthy and pathological. Here, we used a P3b spatial filter to enhance the electroencephalographic (EEG) characteristics underlying 175 subjects divided into 135 MCI subjects, 20 elderly controls (EC), and 20 young volunteers (Y). The Y group served to extract the P3b spatial filter from EEG data, which was later applied to the other groups during resting conditions with eyes open and without being asked to perform any task. The group of 135 MCI subjects could be divided into two subgroups at the end of a month follow-up: 75 with stable MCI (MCI-S, not converted to AD), 60 converted to AD (MCI-C). The P3b spatial filter was built by means of a signal processing method called Functional Source Separation (FSS), which increases signal-to-noise ratio by using a weighted sum of all EEG recording channels rather than relying on a single, or a small sub-set, of channels. A clear difference was observed for the P3b dynamics at rest between groups. Moreover, a machine learning approach showed that P3b at rest could correctly distinguish MCI from EC (80.6% accuracy) and MCI-S from MCI-C (74.1% accuracy), with an accuracy as high as 93.8% in discriminating between MCI-C and EC. Finally, a comparison of the Bayes factor revealed that the group differences among MCI-S and MCI-C were 138 times more likely to be detected using the P3b dynamics compared with the best performing single electrode (Pz) approach. In conclusion, we propose that P3b as measured through spatial filters can be safely regarded as a simple and sensitive marker to predict the conversion from an MCI to AD status eventually combined with other non-neurophysiological biomarkers for a more precise definition of dementia having neuropathological Alzheimer characteristics.
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Affiliation(s)
- Camillo Porcaro
- Department of Neuroscience and Padova Neuroscience Center (PNC), University of Padova, Padova, Italy.,Institute of Cognitive Sciences and Technologies, (ISTC) - National Research Council (CNR), Rome, Italy.,Centre for Human Brain Health and School of Psychology, University of Birmingham, Birmingham, UK
| | - Fabrizio Vecchio
- Brain Connectivity Laboratory, Department of Neurosciences & Neurorehabilitation, IRCCS San Raffaele-Roma, Rome, Italy.,Department of Theoretical and Applied Sciences, eCampus University, Novedrate (Como), Italy
| | - Francesca Miraglia
- Department of Theoretical and Applied Sciences, eCampus University, Novedrate (Como), Italy.,Department of Neurology, Neurovascular Treatment Unit, San Camillo de Lellis Hospital, Rieti, Italy
| | - Giancarlo Zito
- Brain Connectivity Laboratory, Department of Neurosciences & Neurorehabilitation, IRCCS San Raffaele-Roma, Rome, Italy.,Department of Neurology, Neurovascular Treatment Unit, San Camillo de Lellis Hospital, Rieti, Italy
| | - Paolo Maria Rossini
- Brain Connectivity Laboratory, Department of Neurosciences & Neurorehabilitation, IRCCS San Raffaele-Roma, Rome, Italy
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Thinking out loud, an open-access EEG-based BCI dataset for inner speech recognition. Sci Data 2022; 9:52. [PMID: 35165308 PMCID: PMC8844234 DOI: 10.1038/s41597-022-01147-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 12/23/2021] [Indexed: 12/11/2022] Open
Abstract
Surface electroencephalography is a standard and noninvasive way to measure electrical brain activity. Recent advances in artificial intelligence led to significant improvements in the automatic detection of brain patterns, allowing increasingly faster, more reliable and accessible Brain-Computer Interfaces. Different paradigms have been used to enable the human-machine interaction and the last few years have broad a mark increase in the interest for interpreting and characterizing the “inner voice” phenomenon. This paradigm, called inner speech, raises the possibility of executing an order just by thinking about it, allowing a “natural” way of controlling external devices. Unfortunately, the lack of publicly available electroencephalography datasets, restricts the development of new techniques for inner speech recognition. A ten-participant dataset acquired under this and two others related paradigms, recorded with an acquisition system of 136 channels, is presented. The main purpose of this work is to provide the scientific community with an open-access multiclass electroencephalography database of inner speech commands that could be used for better understanding of the related brain mechanisms. Measurement(s) | brain activity • inner speech command | Technology Type(s) | electroencephalography | Sample Characteristic - Organism | Homo sapiens |
Machine-accessible metadata file describing the reported data: 10.6084/m9.figshare.16783987
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Ferracuti F, Iarlori S, Mansour Z, Monteriù A, Porcaro C. Comparing between Different Sets of Preprocessing, Classifiers, and Channels Selection Techniques to Optimise Motor Imagery Pattern Classification System from EEG Pattern Recognition. Brain Sci 2021; 12:57. [PMID: 35053801 PMCID: PMC8774038 DOI: 10.3390/brainsci12010057] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 12/21/2021] [Accepted: 12/23/2021] [Indexed: 12/02/2022] Open
Abstract
The ability to control external devices through thought is increasingly becoming a reality. Human beings can use the electrical signals of their brain to interact or change the surrounding environment and more. The development of this technology called brain-computer interface (BCI) will increasingly allow people with motor disabilities to communicate or use assistive devices to walk, manipulate objects and communicate. Using data from the PhysioNet database, this study implemented a pattern classification system for use in a BCI on 109 healthy volunteers during real movement activities and motor imagery recorded by 64-channels electroencephalography (EEG) system. Different classifiers such as Support Vector Machine (SVM), K-Nearest Neighbors (KNN), and Decision Trees (TREE) were applied on different combinations of EEG channels. Starting from two channels (C3, C4 and CP3 and CP4) positioned on the contralateral and ipsilateral sensorimotor cortex, the Region of Interest (RoI) centred on C3/Cp3 and C4/Cp4 and, finally, a data-driven automatic channels selection was tested to explore the best channel combination able to increase the classification accuracy. The results showed that the proposed automatic channels selection was able to significantly improve the performance of each classifier achieving 98% of accuracy for classification of real and imagined hand movement (sensitivity = 97%, specificity = 99%, AUC = 0.99) by SVM. While the accuracy of the classification between the imagery of hand and foot movements was 91% (sensitivity = 87%, specificity = 86%, AUC = 0.93) also with SVM. In the proposed approach, the data-driven automatic channels selection outperforms classical a priori channel selection models such as C3/C4, Cp3/Cp4, or RoIs around those channels with the utmost accuracy to help remove the boundaries of human communication and improve the quality of life of people with disabilities.
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Affiliation(s)
- Francesco Ferracuti
- Department of Information Engineering, Università Politecnica delle Marche, 60131 Ancona, Italy; (F.F.); (S.I.); (Z.M.); (A.M.)
| | - Sabrina Iarlori
- Department of Information Engineering, Università Politecnica delle Marche, 60131 Ancona, Italy; (F.F.); (S.I.); (Z.M.); (A.M.)
| | - Zahra Mansour
- Department of Information Engineering, Università Politecnica delle Marche, 60131 Ancona, Italy; (F.F.); (S.I.); (Z.M.); (A.M.)
| | - Andrea Monteriù
- Department of Information Engineering, Università Politecnica delle Marche, 60131 Ancona, Italy; (F.F.); (S.I.); (Z.M.); (A.M.)
| | - Camillo Porcaro
- Department of Neuroscience and Padova Neuroscience Center (PNC), University of Padova, 35128 Padova, Italy
- Institute of Cognitive Sciences and Technologies (ISCT)—National Research Council (CNR), 00185 Rome, Italy
- Centre for Human Brain Health, School of Psychology, University of Birmingham, Birmingham B15 2TT, UK
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11
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Mattioli F, Porcaro C, Baldassarre G. A 1D CNN for high accuracy classification and transfer learning in motor imagery EEG-based brain-computer interface. J Neural Eng 2021; 18. [PMID: 34920443 DOI: 10.1088/1741-2552/ac4430] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Accepted: 12/17/2021] [Indexed: 11/11/2022]
Abstract
OBJECTIVE Brain-computer interface (BCI) aims to establish communication paths between the brain processes and external devices. Different methods have been used to extract human intentions from electroencephalography (EEG) recordings. Those based on motor imagery (MI) seem to have a great potential for future applications. These approaches rely on the extraction of EEG distinctive patterns during imagined movements. Techniques able to extract patterns from raw signals represent an important target for BCI as they do not need labor-intensive data pre-processing. APPROACH We propose a new approach based on a 10-layer one-dimensional convolution neural network (1D-CNN) to classify five brain states (four MI classes plus a 'baseline' class) using a data augmentation algorithm and a limited number of EEG channels. In addition, we present a transfer learning method used to extract critical features from the EEG group dataset and then to customize the model to the single individual by training its outer layers with only 12-minute individual-related data. MAIN RESULTS The model tested with the 'EEG Motor Movement/Imagery Dataset' outperforms the current state-of-the-art models by achieving a 99.38% accuracy at the group level. In addition, the transfer learning approach we present achieves an average accuracy of 99.46%. SIGNIFICANCE The proposed methods could foster future BCI applications relying on few-channel portable recording devices and individual-based training.
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Affiliation(s)
- Francesco Mattioli
- Institute of Cognitive Sciences and Technologies (ISTC), CNR, Via San Martino della Battaglia, Roma, Lazio, 00185, ITALY
| | - Camillo Porcaro
- Istituto di Scienze e Tecnologie della Cognizione Consiglio Nazionale delle Ricerche, Via S. Martino della Battaglia, 44, Roma, 00185, ITALY
| | - Gianluca Baldassarre
- Istituto di Scienze e Tecnologie della Cognizione Consiglio Nazionale delle Ricerche, Via S. Martino della Battaglia, 44, Roma, 00185, ITALY
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12
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von Grebmer Zu Wolfsthurn S, Pablos L, Schiller NO. Noun-phrase production as a window to language selection: An ERP study. Neuropsychologia 2021; 162:108055. [PMID: 34626618 DOI: 10.1016/j.neuropsychologia.2021.108055] [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: 05/28/2021] [Revised: 09/09/2021] [Accepted: 10/05/2021] [Indexed: 12/01/2022]
Abstract
Characterising the time course of non-native language production is critical in understanding the mechanisms behind successful communication. Yet, little is known about the modulating role of cross-linguistic influence (CLI) on the temporal unfolding of non-native production and the locus of target language selection. In this study, we explored CLI effects on non-native noun phrase production with behavioural and neural methods. We were particularly interested in the modulation of the P300 as an index for inhibitory control, and the N400 as an index for co-activation and CLI. German late learners of Spanish overtly named pictures while their EEG was monitored. Our results indicate traceable CLI effects at the behavioural and neural level in both early and late production stages. This suggests that speakers faced competition between the target and non-target language until advanced production stages. Our findings add important behavioural and neural evidence to the underpinnings of non-native production processes, in particular for late learners.
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Affiliation(s)
- Sarah von Grebmer Zu Wolfsthurn
- Leiden University Centre for Linguistics (LUCL), Reuvensplaats 3-4, 2311, BE Leiden, the Netherlands; Leiden Institute for Brain and Cognition (LIBC), LUMC, PO Box 9600, 2300, RC Leiden, the Netherlands.
| | - Leticia Pablos
- Leiden University Centre for Linguistics (LUCL), Reuvensplaats 3-4, 2311, BE Leiden, the Netherlands; Leiden Institute for Brain and Cognition (LIBC), LUMC, PO Box 9600, 2300, RC Leiden, the Netherlands
| | - Niels O Schiller
- Leiden University Centre for Linguistics (LUCL), Reuvensplaats 3-4, 2311, BE Leiden, the Netherlands; Leiden Institute for Brain and Cognition (LIBC), LUMC, PO Box 9600, 2300, RC Leiden, the Netherlands
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13
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Jeong H, van den Hoven E, Madec S, Bürki A. Behavioral and Brain Responses Highlight the Role of Usage in the Preparation of Multiword Utterances for Production. J Cogn Neurosci 2021; 33:2231-2264. [PMID: 34272953 DOI: 10.1162/jocn_a_01757] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Usage-based theories assume that all aspects of language processing are shaped by the distributional properties of the language. The frequency not only of words but also of larger chunks plays a major role in language processing. These theories predict that the frequency of phrases influences the time needed to prepare these phrases for production and their acoustic duration. By contrast, dominant psycholinguistic models of utterance production predict no such effects. In these models, the system keeps track of the frequency of individual words but not of co-occurrences. This study investigates the extent to which the frequency of phrases impacts naming latencies and acoustic duration with a balanced design, where the same words are recombined to build high- and low-frequency phrases. The brain signal of participants is recorded so as to obtain information on the electrophysiological bases and functional locus of frequency effects. Forty-seven participants named pictures using high- and low-frequency adjective-noun phrases. Naming latencies were shorter for high-frequency than low-frequency phrases. There was no evidence that phrase frequency impacted acoustic duration. The electrophysiological signal differed between high- and low-frequency phrases in time windows that do not overlap with conceptualization or articulation processes. These findings suggest that phrase frequency influences the preparation of phrases for production, irrespective of the lexical properties of the constituents, and that this effect originates at least partly when speakers access and encode linguistic representations. Moreover, this study provides information on how the brain signal recorded during the preparation of utterances changes with the frequency of word combinations.
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14
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Padalino M, Scardino C, Zito G, Cancelli A, Cottone C, Bertoli M, Gianni E, L'Abbate T, Trombetta E, Porcaro C, Bini F, Marinozzi F, Filippi MM, Tecchio F. Effects on Motor Control of Personalized Neuromodulation Against Multiple Sclerosis Fatigue. Brain Topogr 2021; 34:363-372. [PMID: 33656622 DOI: 10.1007/s10548-021-00820-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 01/06/2021] [Indexed: 10/22/2022]
Abstract
Fatigue is a hidden symptom of Multiple Sclerosis (MS) disease that nevertheless impacts severely on patients' everyday life. Evidence indicates the involvement of the sensorimotor network and its inter-nodes communication at the basis of this symptom. Two randomized controlled trials (RCTs) showed that the personalized neuromodulation called Fatigue Relief in Multiple Sclerosis (FaReMuS) efficaciously fights multiple sclerosis (MS) fatigue. By this Proof of Concept study, we tested whether FaReMuS reverts the alteration of the brain-muscular synchronization previously observed occurring with fatigue. The cortico muscular coherence (CMC) was studied in 11 patients before and after FaReMuS, a 5-day tDCS (1.5 mA, 15 min per day) anodal over the whole body's somatosensory representation (S1) via a personalized MRI-based electrode (35 cm2) against the occipital cathode (70 cm2). Before FaReMuS, the CMC was observed at a mean frequency of 31.5 ± 1.6 Hz (gamma-band) and positively correlated with the level of fatigue (p = .027). After FaReMuS, fatigue reduced in average of 28% ± 33% the baseline level, and the CMC frequency reduced to 26.6 ± 1.5 Hz (p = .022), thus forthcoming the physiological beta-band as observed in healthy people. The personalized S1 neuromodulation treatment, ameliorating the central-peripheral communication that subtends simple everyday movements, supports the appropriateness of neuromodulations aiming at increasing the parietal excitability in fighting MS fatigue. The relationship between central-peripheral features and fatigue profile strengthens a central more than peripheral origin of the symptom.
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Affiliation(s)
| | - Carla Scardino
- LET'S-ISTC-CNR, via Palestro 32, 00185, Rome, Italy.,Department of Mechanical and Aerospace Engineering, "Sapienza" University of Rome, Rome, Italy
| | - Giancarlo Zito
- Complex Operative Unit of Neurology, Emergency Department, San Camillo de Lellis Hospital, Viale Kennedy, Rieti, 02100, RI, Italy.,Diagnostic and Clinical Assessment Unit, Istituto di Ortofonologia, Via Salaria, 30, Rome, 00198, RM, Italy
| | | | | | - Massimo Bertoli
- LET'S-ISTC-CNR, via Palestro 32, 00185, Rome, Italy.,Department of Imaging and Neuroscience and Clinical Sciences, University 'G. D'Annunzio' of Chieti-Pescara, Chieti, Italy
| | - Eugenia Gianni
- LET'S-ISTC-CNR, via Palestro 32, 00185, Rome, Italy.,Unit of Neurology, Neurophysiology, Neurobiology, Department of Medicine, Università Campus Bio-Medico di Roma, Rome, Italy
| | | | | | - Camillo Porcaro
- LET'S-ISTC-CNR, via Palestro 32, 00185, Rome, Italy.,Centre for Human Brain Health and School of Psychology, University of Birmingham, Birmingham, UK.,Department of Information Engineering, Università Politecnica Delle Marche, Ancona, Italy.,S. Anna Institute and Research in Advanced Neurorehabilitation (RAN), Crotone, Italy
| | - Fabiano Bini
- Department of Mechanical and Aerospace Engineering, "Sapienza" University of Rome, Rome, Italy
| | - Franco Marinozzi
- Department of Mechanical and Aerospace Engineering, "Sapienza" University of Rome, Rome, Italy
| | - Maria Maddalena Filippi
- Complex Operative Unit of Neurology, Emergency Department, San Camillo de Lellis Hospital, Viale Kennedy, Rieti, 02100, RI, Italy
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15
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Porcaro C, Mayhew SD, Bagshaw AP. Role of the Ipsilateral Primary Motor Cortex in the Visuo-Motor Network During Fine Contractions and Accurate Performance. Int J Neural Syst 2021; 31:2150011. [PMID: 33622198 DOI: 10.1142/s0129065721500118] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
It is widely recognized that continuous sensory feedback plays a crucial role in accurate motor control in everyday life. Feedback information is used to adapt force output and to correct errors. While primary motor cortex contralateral to the movement (cM1) plays a dominant role in this control, converging evidence supports the idea that ipsilateral primary motor cortex (iM1) also directly contributes to hand and finger movements. Similarly, when visual feedback is available, primary visual cortex (V1) and its interactions with the motor network also become important for accurate motor performance. To elucidate this issue, we performed and integrated behavioral and electroencephalography (EEG) measurements during isometric compression of a compliant rubber bulb, at 10% and 30% of maximum voluntary contraction, both with and without visual feedback. We used a semi-blind approach (functional source separation (FSS)) to identify separate functional sources of mu-frequency (8-13[Formula: see text]Hz) EEG responses in cM1, iM1 and V1. Here for the first time, we have used orthogonal FSS to extract multiple sources, by using the same functional constraint, providing the ability to extract different sources that oscillate in the same frequency range but that have different topographic distributions. We analyzed the single-trial timecourses of mu power event-related desynchronization (ERD) in these sources and linked them with force measurements to understand which aspects are most important for good task performance. Whilst the amplitude of mu power was not related to contraction force in any of the sources, it was able to provide information on performance quality. We observed stronger ERDs in both contralateral and ipsilateral motor sources during trials where contraction force was most consistently maintained. This effect was most prominent in the ipsilateral source, suggesting the importance of iM1 to accurate performance. This ERD effect was sustained throughout the duration of visual feedback trials, but only present at the start of no feedback trials, consistent with more variable performance in the absence of feedback. Overall, we found that the behavior of the ERD in iM1 was the most informative aspect concerning the accuracy of the contraction performance, and the ability to maintain a steady level of contraction. This new approach of using FSS to extract multiple orthogonal sources provides the ability to investigate both contralateral and ipsilateral nodes of the motor network without the need for additional information (e.g. electromyography). The enhanced signal-to-noise ratio provided by FSS opens the possibility of extracting complex EEG features on an individual trial basis, which is crucial for a more nuanced understanding of fine motor performance, as well as for applications in brain-computer interfacing.
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Affiliation(s)
- Camillo Porcaro
- Institute of Cognitive Sciences and Technologies, (ISTC) - National Research Council (CNR), Rome, Italy.,Centre for Human Brain Health and School of Psychology, University of Birmingham, Birmingham, UK.,S. Anna Institute and Research in Advanced Neurorehabilitation (RAN), Crotone, Italy.,Department of Information Engineering - Università Politecnica delle Marche, Ancona, Italy.,Research Center for Motor Control and Neuroplasticity, KU Leuven, Leuven, Belgium
| | - Stephen D Mayhew
- Centre for Human Brain Health and School of Psychology, University of Birmingham, Birmingham, UK
| | - Andrew P Bagshaw
- Centre for Human Brain Health and School of Psychology, University of Birmingham, Birmingham, UK
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16
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Lorenz A, Zwitserlood P, Bürki A, Regel S, Ouyang G, Abdel Rahman R. Morphological facilitation and semantic interference in compound production: An ERP study. Cognition 2021; 209:104518. [PMID: 33545513 DOI: 10.1016/j.cognition.2020.104518] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 10/28/2020] [Accepted: 11/11/2020] [Indexed: 11/18/2022]
Abstract
This study investigates the production of nominal compounds (Experiment 1) and simple nouns (Experiment 2) in a picture-word interference (PWI) paradigm to test models of morpho-lexical representation and processing. The continuous electroencephalogram (EEG) was registered and event-related brain potentials [ERPs] were analyzed in addition to picture-naming latencies. Experiment 1 used morphologically and semantically related distractor words to tap into different pre-articulatory planning stages during compound production. Relative to unrelated distractors, naming was speeded when distractors corresponded to morphemes of the compound (sun or flower for the target sunflower), but slowed when distractors were from the same semantic category as the compound (tulip ➔ sunflower). Distractors from the same category as the compound's first constituent (moon ➔ sunflower) had no influence. The diverging effects for semantic and morphological distractors replicate results from earlier studies. ERPs revealed different effects of morphological and semantic distractors with an interesting time course: morphological effects had an earlier onset. Comparable to the naming latencies, no ERP effects were obtained for distractors from the same semantic category as the compound's first constituent. Experiment 2 investigated the effectiveness of the latter distractors, presenting them with pictures of the compounds' first constituents (e.g., moon ➔ sun). Interference was confirmed both behaviorally and in the ERPs, showing that the absence of an effect in Experiment 1 was not due to the materials used. Considering current models of speech production, the data are best explained by a cascading flow of activation throughout semantic, lexical and morpho-phonological steps of speech planning.
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Affiliation(s)
- Antje Lorenz
- Department of Psychology, Neurocognitive Psychology, Humboldt-Universität zu Berlin, Germany.
| | - Pienie Zwitserlood
- Department of Psychology and Otto Creutzfeldt Center for Cognitive and Behavioral Neuroscience, University of Münster, Germany
| | - Audrey Bürki
- Department of Linguistics, University of Potsdam, Germany
| | - Stefanie Regel
- Department of Psychology, Neurocognitive Psychology, Humboldt-Universität zu Berlin, Germany
| | - Guang Ouyang
- Faculty of Education, University of Hong Kong, China
| | - Rasha Abdel Rahman
- Department of Psychology, Neurocognitive Psychology, Humboldt-Universität zu Berlin, Germany
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17
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Alzahab NA, Apollonio L, Di Iorio A, Alshalak M, Iarlori S, Ferracuti F, Monteriù A, Porcaro C. Hybrid Deep Learning (hDL)-Based Brain-Computer Interface (BCI) Systems: A Systematic Review. Brain Sci 2021; 11:75. [PMID: 33429938 PMCID: PMC7827826 DOI: 10.3390/brainsci11010075] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/12/2020] [Accepted: 01/04/2021] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND Brain-Computer Interface (BCI) is becoming more reliable, thanks to the advantages of Artificial Intelligence (AI). Recently, hybrid Deep Learning (hDL), which combines different DL algorithms, has gained momentum over the past five years. In this work, we proposed a review on hDL-based BCI starting from the seminal studies in 2015. OBJECTIVES We have reviewed 47 papers that apply hDL to the BCI system published between 2015 and 2020 extracting trends and highlighting relevant aspects to the topic. METHODS We have queried four scientific search engines (Google Scholar, PubMed, IEEE Xplore and Elsevier Science Direct) and different data items were extracted from each paper such as the database used, kind of application, online/offline training, tasks used for the BCI, pre-processing methodology adopted, type of normalization used, which kind of features were extracted, type of DL architecture used, number of layers implemented and which optimization approach were used as well. All these items were then investigated one by one to uncover trends. RESULTS Our investigation reveals that Electroencephalography (EEG) has been the most used technique. Interestingly, despite the lower Signal-to-Noise Ratio (SNR) of the EEG data that makes pre-processing of that data mandatory, we have found that the pre-processing has only been used in 21.28% of the cases by showing that hDL seems to be able to overcome this intrinsic drawback of the EEG data. Temporal-features seem to be the most effective with 93.94% accuracy, while spatial-temporal features are the most used with 33.33% of the cases investigated. The most used architecture has been Convolutional Neural Network-Recurrent Neural Network CNN-RNN with 47% of the cases. Moreover, half of the studies have used a low number of layers to achieve a good compromise between the complexity of the network and computational efficiency. SIGNIFICANCE To give useful information to the scientific community, we make our summary table of hDL-based BCI papers available and invite the community to published work to contribute to it directly. We have indicated a list of open challenges, emphasizing the need to use neuroimaging techniques other than EEG, such as functional Near-Infrared Spectroscopy (fNIRS), deeper investigate the advantages and disadvantages of using pre-processing and the relationship with the accuracy obtained. To implement new combinations of architectures, such as RNN-based and Deep Belief Network DBN-based, it is necessary to better explore the frequency and temporal-frequency features of the data at hand.
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Affiliation(s)
- Nibras Abo Alzahab
- Department of Information Engineering, Università Politecnica delle Marche, Via Brecce Bianche 12, 60131 Ancona, Italy; (N.A.A.); (L.A.); (A.D.I.); (M.A.); (S.I.); (F.F.); (A.M.)
| | - Luca Apollonio
- Department of Information Engineering, Università Politecnica delle Marche, Via Brecce Bianche 12, 60131 Ancona, Italy; (N.A.A.); (L.A.); (A.D.I.); (M.A.); (S.I.); (F.F.); (A.M.)
| | - Angelo Di Iorio
- Department of Information Engineering, Università Politecnica delle Marche, Via Brecce Bianche 12, 60131 Ancona, Italy; (N.A.A.); (L.A.); (A.D.I.); (M.A.); (S.I.); (F.F.); (A.M.)
| | - Muaaz Alshalak
- Department of Information Engineering, Università Politecnica delle Marche, Via Brecce Bianche 12, 60131 Ancona, Italy; (N.A.A.); (L.A.); (A.D.I.); (M.A.); (S.I.); (F.F.); (A.M.)
| | - Sabrina Iarlori
- Department of Information Engineering, Università Politecnica delle Marche, Via Brecce Bianche 12, 60131 Ancona, Italy; (N.A.A.); (L.A.); (A.D.I.); (M.A.); (S.I.); (F.F.); (A.M.)
| | - Francesco Ferracuti
- Department of Information Engineering, Università Politecnica delle Marche, Via Brecce Bianche 12, 60131 Ancona, Italy; (N.A.A.); (L.A.); (A.D.I.); (M.A.); (S.I.); (F.F.); (A.M.)
| | - Andrea Monteriù
- Department of Information Engineering, Università Politecnica delle Marche, Via Brecce Bianche 12, 60131 Ancona, Italy; (N.A.A.); (L.A.); (A.D.I.); (M.A.); (S.I.); (F.F.); (A.M.)
| | - Camillo Porcaro
- Department of Information Engineering, Università Politecnica delle Marche, Via Brecce Bianche 12, 60131 Ancona, Italy; (N.A.A.); (L.A.); (A.D.I.); (M.A.); (S.I.); (F.F.); (A.M.)
- Institute of Cognitive Sciences and Technologies (ISTC)—National Research Council (CNR), 00185 Rome, Italy
- S. Anna Institute and Research in Advanced Neurorehabilitation (RAN), 88900 Crotone, Italy
- Centre for Human Brain Health, School of Psychology, University of Birmingham, Birmingham B15 2TT, UK
- Research Center for Motor Control and Neuroplasticity, KU Leuven, 3000 Leuven, Belgium
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18
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Miraglia F, Tomino C, Vecchio F, Alù F, Orticoni A, Judica E, Cotelli M, Rossini PM. Assessing the dependence of the number of EEG channels in the brain networks' modulations. Brain Res Bull 2020; 167:33-36. [PMID: 33242521 DOI: 10.1016/j.brainresbull.2020.11.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 11/04/2020] [Accepted: 11/19/2020] [Indexed: 10/22/2022]
Abstract
Aim of the study was to evaluate the influence of the EEG channels number on the brain networks' analysis, to establish whether and how much higher density EEG actually contributes to add supplementary information to brain networks analyses. 59 electrodes EEGs were recorded in 20 healthy subjects in eyes open and closed condition. For each condition, we analyzed the recording dataset of 59 channels, and three sub-datasets obtained by the selection of 44, 30, 19 channels from the 59 ones. Then we computed the EEG sources of current density and evaluated the SW index in the four EEGs data montages. Results showed that in the eyes open condition the number of recording channels influences more the SW index modulation respect that in the eyes closed condition. Conversely, in the eyes closed condition the brain activity is less affected by specific brain regions' activations and the signal's generators produced not significant variations on EEG data and consequently the small world network measure is not affected by the recording channels number. We can conclude that in the eyes closed condition, the 19 EEG channels is an acceptable montage to study brain networks' modulations, to both detect the higher and the lower brain waves' frequencies.
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Affiliation(s)
- Francesca Miraglia
- Brain Connectivity Laboratory, Department of Neuroscience and Neurorehabilitation, IRCCS San Raffaele Pisana, Rome, Italy.
| | - Carlo Tomino
- Scientific Directorate, IRCCS San Raffaele Pisana, Rome, Italy
| | - Fabrizio Vecchio
- Brain Connectivity Laboratory, Department of Neuroscience and Neurorehabilitation, IRCCS San Raffaele Pisana, Rome, Italy
| | - Francesca Alù
- Brain Connectivity Laboratory, Department of Neuroscience and Neurorehabilitation, IRCCS San Raffaele Pisana, Rome, Italy
| | - Alessandro Orticoni
- Brain Connectivity Laboratory, Department of Neuroscience and Neurorehabilitation, IRCCS San Raffaele Pisana, Rome, Italy
| | - Elda Judica
- Department of Neurorehabilitation Sciences, Casa Cura Policlinico, Milano, Italy
| | - Maria Cotelli
- Neuropsychology Unit, IRCCS Istituto Centro San Giovanni di Dio Fatebenefratelli, Brescia, Italy
| | - Paolo Maria Rossini
- Brain Connectivity Laboratory, Department of Neuroscience and Neurorehabilitation, IRCCS San Raffaele Pisana, Rome, Italy
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19
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Jouen AL, Lancheros M, Laganaro M. Microstate ERP Analyses to Pinpoint the Articulatory Onset in Speech Production. Brain Topogr 2020; 34:29-40. [PMID: 33161471 PMCID: PMC7803690 DOI: 10.1007/s10548-020-00803-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 10/23/2020] [Indexed: 11/29/2022]
Abstract
The use of electroencephalography (EEG) to study overt speech production has increased substantially in the past 15 years and the alignment of evoked potential (ERPs) on the response onset has become an extremely useful method to target “latest” stages of speech production. Yet, response-locked ERPs raise a methodological issue: on which event should the point of alignment be placed? Response-locked ERPs are usually aligned to the vocal (acoustic) onset, although it is well known that articulatory movements may start up to a hundred milliseconds prior to the acoustic onset and that this “articulatory onset to acoustic onset interval” (AAI) depends on the phoneme properties. Given the previously reported difficulties to measure the AAI, the purpose of this study was to determine if the AAI could be reliably detected with EEG-microstates. High-density EEG was recorded during delayed speech production of monosyllabic pseudowords with four different onset consonants. Whereas the acoustic response onsets varied depending on the onset consonant, the response-locked spatiotemporal EEG analysis revealed a clear asynchrony of the same sequence of microstates across onset consonants. A specific microstate, the latest observed in the ERPs locked to the vocal onset, presented longer duration for phonemes with longer acoustic response onsets. Converging evidences seemed to confirm that this microstate may be related to the articulatory onset of motor execution: its scalp topography corresponded to those previously associated with muscle activity and source localization highlighted the involvement of motor areas. Finally, the analyses on the duration of such microstate in single trials further fit with the AAI intervals for specific phonemes reported in previous studies. These results thus suggest that a particular ERP-microstate is a reliable index of articulation onset and of the AAI.
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Affiliation(s)
- Anne-Lise Jouen
- Faculty of Psychology and Educational Science (FPSE), University of Geneva, 28 Boulevard du Pont d'Arve, 1205, Geneva, Switzerland.
| | - Monica Lancheros
- Faculty of Psychology and Educational Science (FPSE), University of Geneva, 28 Boulevard du Pont d'Arve, 1205, Geneva, Switzerland
| | - Marina Laganaro
- Faculty of Psychology and Educational Science (FPSE), University of Geneva, 28 Boulevard du Pont d'Arve, 1205, Geneva, Switzerland
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20
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Ferracuti F, Casadei V, Marcantoni I, Iarlori S, Burattini L, Monteriù A, Porcaro C. A functional source separation algorithm to enhance error-related potentials monitoring in noninvasive brain-computer interface. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2020; 191:105419. [PMID: 32151908 DOI: 10.1016/j.cmpb.2020.105419] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 02/11/2020] [Accepted: 02/26/2020] [Indexed: 06/10/2023]
Abstract
BACKGROUND AND OBJECTIVES An Error related Potential (ErrP) can be noninvasively and directly measured from the scalp through electroencephalography (EEG), as response, when a person realizes they are making an error during a task (as a consequence of a cognitive error performed from the user). It has been shown that ErrPs can be automatically detected with time-discrete feedback tasks, which are widely applied in the Brain-Computer Interface (BCI) field for error correction or adaptation. In this work, a semi-supervised algorithm, namely the Functional Source Separation (FSS), is proposed to estimate a spatial filter for learning the ErrPs and to enhance the evoked potentials. METHODS EEG data recorded on six subjects were used to evaluate the proposed method based on FFS algorithm in comparison with the xDAWN algorithm. FSS- and xDAWN-based methods were compared also to the Cz and FCz single channel. Single-trial classification was considered to evaluate the performances of the approaches. (Both the approaches were evaluated on single-trial classification of EEGs.) RESULTS: The results presented using the Bayesian Linear Discriminant Analysis (BLDA) classifier, show that FSS (accuracy 0.92, sensitivity 0.95, specificity 0.81, F1-score 0.95) overcomes the other methods (Cz - accuracy 0.72, sensitivity 0.74, specificity 0.63, F1-score 0.74; FCz - accuracy 0.72, sensitivity 0.75, specificity 0.61, F1-score 0.75; xDAWN - accuracy 0.75, sensitivity 0.79, specificity 0.61, F1-score 0.79) in terms of single-trial classification. CONCLUSIONS The proposed FSS-based method increases the single-trial detection accuracy of ErrPs with respect to both single channel (Cz, FCz) and xDAWN spatial filter.
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Affiliation(s)
- Francesco Ferracuti
- Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy.
| | - Valentina Casadei
- Department of Electrical Engineering & Electronics, University of Liverpool, Liverpool, United Kingdom.
| | - Ilaria Marcantoni
- Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy.
| | - Sabrina Iarlori
- Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy.
| | - Laura Burattini
- Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy.
| | - Andrea Monteriù
- Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy.
| | - Camillo Porcaro
- Institute of Cognitive Sciences and Technologies (ISTC) - National Research Council (CNR), Rome, Italy; Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy; Research Center for Motor Control and Neuroplasticity, KU Leuven, Leuven, Belgium; S. Anna Institute and Research in Advanced Neurorehabilitation (RAN) Crotone, Italy; Centre for Human Brain Health, School of Psychology, University of Birmingham, Birmingham, United Kingdom.
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21
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Janssen N, Meij MVD, López-Pérez PJ, Barber HA. Exploring the temporal dynamics of speech production with EEG and group ICA. Sci Rep 2020; 10:3667. [PMID: 32111868 PMCID: PMC7048769 DOI: 10.1038/s41598-020-60301-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 02/11/2020] [Indexed: 12/22/2022] Open
Abstract
Speech production is a complex skill whose neural implementation relies on a large number of different regions in the brain. How neural activity in these different regions varies as a function of time during the production of speech remains poorly understood. Previous MEG studies on this topic have concluded that activity proceeds from posterior to anterior regions of the brain in a sequential manner. Here we tested this claim using the EEG technique. Specifically, participants performed a picture naming task while their naming latencies and scalp potentials were recorded. We performed group temporal Independent Component Analysis (group tICA) to obtain temporally independent component timecourses and their corresponding topographic maps. We identified fifteen components whose estimated neural sources were located in various areas of the brain. The trial-by-trial component timecourses were predictive of the naming latency, implying their involvement in the task. Crucially, we computed the degree of concurrent activity of each component timecourse to test whether activity was sequential or parallel. Our results revealed that these fifteen distinct neural sources exhibit largely concurrent activity during speech production. These results suggest that speech production relies on neural activity that takes place in parallel networks of distributed neural sources.
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Affiliation(s)
- Niels Janssen
- Departamento de Psicología, Universidad de la Laguna, La Laguna, Spain. .,Instituto de Tecnologías Biomedicas, Universidad de la Laguna, La Laguna, Spain. .,Instituto de Neurociencias, Universidad de la Laguna, La Laguna, Spain.
| | | | | | - Horacio A Barber
- Departamento de Psicología, Universidad de la Laguna, La Laguna, Spain.,Instituto de Tecnologías Biomedicas, Universidad de la Laguna, La Laguna, Spain.,Instituto de Neurociencias, Universidad de la Laguna, La Laguna, Spain.,Basque Center on Cognition, Brain and Language (BCBL), Donostia, Spain
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22
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Peeters D. Bilingual switching between languages and listeners: Insights from immersive virtual reality. Cognition 2020; 195:104107. [DOI: 10.1016/j.cognition.2019.104107] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 08/28/2019] [Accepted: 10/11/2019] [Indexed: 01/08/2023]
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23
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Low Complexity Automatic Stationary Wavelet Transform for Elimination of Eye Blinks from EEG. Brain Sci 2019; 9:brainsci9120352. [PMID: 31810263 PMCID: PMC6955982 DOI: 10.3390/brainsci9120352] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 11/27/2019] [Indexed: 12/20/2022] Open
Abstract
The electroencephalogram signal (EEG) often suffers from various artifacts and noises that have physiological and non-physiological origins. Among these artifacts, eye blink, due to its amplitude is considered to have the most influence on EEG analysis. In this paper, a low complexity approach based on Stationary Wavelet Transform (SWT) and skewness is proposed to remove eye blink artifacts from EEG signals. The proposed method is compared against Automatic Wavelet Independent Components Analysis (AWICA) and Enhanced AWICA. Normalized Root Mean Square Error (NRMSE), Peak Signal-to-Noise Ratio (PSNR), and correlation coefficient ( ρ ) between filtered and pure EEG signals are utilized to quantify artifact removal performance. The proposed approach shows smaller NRMSE, larger PSNR, and larger correlation coefficient values compared to the other methods. Furthermore, the speed of execution of the proposed method is considerably faster than other methods, which makes it more suitable for real-time processing.
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Krott A, Medaglia MT, Porcaro C. Early and Late Effects of Semantic Distractors on Electroencephalographic Responses During Overt Picture Naming. Front Psychol 2019; 10:696. [PMID: 30984085 PMCID: PMC6447652 DOI: 10.3389/fpsyg.2019.00696] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 03/12/2019] [Indexed: 11/17/2022] Open
Abstract
This study investigated the nature of the interference effect of semantically related distractors in the picture-word interference paradigm, which has been claimed to be caused by either competition between lexical representations of target and distractor or by a late response exclusion mechanism that removes the distractor from a response buffer. EEG was recorded while participants overtly named pictures accompanied by categorically related versus unrelated written distractor words. In contrast to previous studies, stimuli were presented for only 250 ms to avoid any re-processing. ERP effects of relatedness were found around 290, 470, 540, and 660 ms post stimulus onset. In addition, related distractors led to an increase in midfrontal theta power, especially from about 440 to 540 ms, as well as to decreased high beta power between 40 and 110 ms and increased high beta power between 275 and 340 ms post stimulus onset. Response-locked analyses showed no differences in ERPs, however increased low and high beta power for related distractors in various time windows, most importantly a high beta power increase between -175 and -155 ms before speech onset. These results suggest that the semantic distractor effect is a combination of various effects and that the lexical competition account and the response exclusion account each capture a part, but not all aspects of the effect.
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Affiliation(s)
- Andrea Krott
- Centre for Human Brain Health, School of Psychology, University of Birmingham, Birmingham, United Kingdom
| | - Maria Teresa Medaglia
- Institute of Cognitive Sciences and Technologies (ISTC) – National Research Council (CNR), Rome, Italy
| | - Camillo Porcaro
- Centre for Human Brain Health, School of Psychology, University of Birmingham, Birmingham, United Kingdom
- Institute of Cognitive Sciences and Technologies (ISTC) – National Research Council (CNR), Rome, Italy
- S. Anna Institute and Research in Advanced Neurorehabilitation (RAN), Crotone, Italy
- Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy
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25
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Porcaro C, Balsters JH, Mantini D, Robertson IH, Wenderoth N. P3b amplitude as a signature of cognitive decline in the older population: An EEG study enhanced by Functional Source Separation. Neuroimage 2019; 184:535-546. [DOI: 10.1016/j.neuroimage.2018.09.057] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 09/03/2018] [Accepted: 09/20/2018] [Indexed: 10/28/2022] Open
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26
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Carletto S, Porcaro C, Settanta C, Vizzari V, Stanizzo MR, Oliva F, Torta R, Fernandez I, Coletti Moja M, Pagani M, Ostacoli L. Neurobiological features and response to eye movement desensitization and reprocessing treatment of posttraumatic stress disorder in patients with breast cancer. Eur J Psychotraumatol 2019; 10:1600832. [PMID: 31073391 PMCID: PMC6495116 DOI: 10.1080/20008198.2019.1600832] [Citation(s) in RCA: 9] [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: 08/07/2018] [Revised: 03/14/2019] [Accepted: 03/14/2019] [Indexed: 11/16/2022] Open
Abstract
Background: Breast cancer (BC) is one of the most common invasive types of cancer among women, with important consequences on both physical and psychological functioning. Patients with BC have a great risk of developing posttraumatic stress disorder (PTSD), but few studies have evaluated the efficacy of psychological interventions to treat it. Furthermore, no neuroimaging studies have evaluated the neurobiological effects of psychotherapeutic treatment for BC-related PTSD. Objective: The study aimed to evaluate the efficacy of Eye Movement Desensitization and Reprocessing therapy (EMDR) as compared to Treatment as Usual (TAU) in BC patients with PTSD, identifying by electroencephalography (EEG) the neurophysiological changes underlying treatments effect and their correlation with clinical symptoms. Method: Thirty patients with BC and PTSD diagnosis were included, receiving either EMDR (n = 15) or TAU (n = 15). Patients were assessed before and after treatments with clinical questionnaires and EEG. The proportion of patients who no longer meet criteria for PTSD after the intervention and changes in clinical scores, both between and within groups, were evaluated. Two-sample permutation t-tests among EEG channels were performed to investigate differences in power spectral density between groups. Pearson correlation analysis was carried out between power bands and clinical scores. Results: At post-treatment, all patients treated with EMDR no longer met criteria for PTSD, while all patients treated with TAU maintained the diagnosis. A significant decrease in depressive symptoms was found only in the EMDR group, while anxiety remained stable in all patients. EEG results corroborated these findings, showing significant differences in delta and theta bands in left angular and right fusiform gyri only in the EMDR group. Conclusions: It is essential to detect PTSD symptoms in patients with BC, in order to offer proper interventions. The efficacy of EMDR therapy in reducing cancer-related PTSD is supported by both clinical and neurobiological findings.
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Affiliation(s)
- Sara Carletto
- Department of Clinical and Biological Sciences, University of Turin, Turin, Italy
| | - Camillo Porcaro
- Institute of Cognitive Sciences and Technologies, Consiglio Nazionale delle Ricerche, Rome, Italy.,S. Anna Institute and Research in Advanced Neurorehabilitation (RAN), Crotone, Italy.,Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy.,Centre for Human Brain Health and School of Psychology, University of Birmingham, Birmingham, UK
| | - Carmen Settanta
- Department of Clinical and Biological Sciences, University of Turin, Turin, Italy
| | | | - Maria Rosa Stanizzo
- Clinical and Oncological Psychology, Città della Salute e della Scienza Hospital of Turin, Turin, Italy
| | - Francesco Oliva
- Department of Clinical and Biological Sciences, University of Turin, Turin, Italy
| | - Riccardo Torta
- Department of Neurosciences, University of Turin, Turin, Italy.,Clinical and Oncological Psychology, Città della Salute e della Scienza Hospital of Turin, Turin, Italy
| | | | | | - Marco Pagani
- Institute of Cognitive Sciences and Technologies, Consiglio Nazionale delle Ricerche, Rome, Italy
| | - Luca Ostacoli
- Department of Clinical and Biological Sciences, University of Turin, Turin, Italy.,Clinical and Oncological Psychology, Città della Salute e della Scienza Hospital of Turin, Turin, Italy
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27
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Migliore S, Curcio G, Porcaro C, Cottone C, Simonelli I, D'aurizio G, Landi D, Palmieri M, Ghazaryan A, Squitieri F, Filippi M, Vernieri F. Emotional processing in RRMS patients: Dissociation between behavioural and neurophysiological response. Mult Scler Relat Disord 2019; 27:344-349. [DOI: 10.1016/j.msard.2018.11.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 11/13/2018] [Accepted: 11/17/2018] [Indexed: 10/27/2022]
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28
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Jahangiri A, Sepulveda F. The Relative Contribution of High-Gamma Linguistic Processing Stages of Word Production, and Motor Imagery of Articulation in Class Separability of Covert Speech Tasks in EEG Data. J Med Syst 2018; 43:20. [PMID: 30564961 PMCID: PMC6299054 DOI: 10.1007/s10916-018-1137-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Accepted: 12/06/2018] [Indexed: 02/08/2023]
Abstract
Word production begins with high-Gamma automatic linguistic processing functions followed by speech motor planning and articulation. Phonetic properties are processed in both linguistic and motor stages of word production. Four phonetically dissimilar phonemic structures “BA”, “FO”, “LE”, and “RY” were chosen as covert speech tasks. Ten neurologically healthy volunteers with the age range of 21–33 participated in this experiment. Participants were asked to covertly speak a phonemic structure when they heard an auditory cue. EEG was recorded with 64 electrodes at 2048 samples/s. Initially, one-second trials were used, which contained linguistic and motor imagery activities. The four-class true positive rate was calculated. In the next stage, 312 ms trials were used to exclude covert articulation from analysis. By eliminating the covert articulation stage, the four-class grand average classification accuracy dropped from 96.4% to 94.5%. The most valuable features emerge after Auditory cue recognition (~100 ms post onset), and within the 70–128 Hz frequency range. The most significant identified brain regions were the Prefrontal Cortex (linked to stimulus driven executive control), Wernicke’s area (linked to Phonological code retrieval), the right IFG, and Broca’s area (linked to syllabification). Alpha and Beta band oscillations associated with motor imagery do not contain enough information to fully reflect the complexity of speech movements. Over 90% of the most class-dependent features were in the 30-128 Hz range, even during the covert articulation stage. As a result, compared to linguistic functions, the contribution of motor imagery of articulation in class separability of covert speech tasks from EEG data is negligible.
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Affiliation(s)
- Amir Jahangiri
- BCI+NE Laboratory, School of Computer Science and Electronic Engineering, University of Essex, Colchester, UK.
| | - Francisco Sepulveda
- BCI+NE Laboratory, School of Computer Science and Electronic Engineering, University of Essex, Colchester, UK
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29
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Saltuklaroglu T, Bowers A, Harkrider AW, Casenhiser D, Reilly KJ, Jenson DE, Thornton D. EEG mu rhythms: Rich sources of sensorimotor information in speech processing. BRAIN AND LANGUAGE 2018; 187:41-61. [PMID: 30509381 DOI: 10.1016/j.bandl.2018.09.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 09/27/2017] [Accepted: 09/23/2018] [Indexed: 06/09/2023]
Affiliation(s)
- Tim Saltuklaroglu
- Department of Audiology and Speech-Language Pathology, University of Tennessee Health Sciences, Knoxville, TN 37996, USA.
| | - Andrew Bowers
- University of Arkansas, Epley Center for Health Professions, 606 N. Razorback Road, Fayetteville, AR 72701, USA
| | - Ashley W Harkrider
- Department of Audiology and Speech-Language Pathology, University of Tennessee Health Sciences, Knoxville, TN 37996, USA
| | - Devin Casenhiser
- Department of Audiology and Speech-Language Pathology, University of Tennessee Health Sciences, Knoxville, TN 37996, USA
| | - Kevin J Reilly
- Department of Audiology and Speech-Language Pathology, University of Tennessee Health Sciences, Knoxville, TN 37996, USA
| | - David E Jenson
- Department of Speech and Hearing Sciences, Elson S. Floyd College of Medicine, Spokane, WA 99210-1495, USA
| | - David Thornton
- Department of Hearing, Speech, and Language Sciences, Gallaudet University, 800 Florida Avenue NE, Washington, DC 20002, USA
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30
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Marino M, Liu Q, Samogin J, Tecchio F, Cottone C, Mantini D, Porcaro C. Neuronal dynamics enable the functional differentiation of resting state networks in the human brain. Hum Brain Mapp 2018; 40:1445-1457. [PMID: 30430697 DOI: 10.1002/hbm.24458] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Accepted: 10/22/2018] [Indexed: 12/11/2022] Open
Abstract
Intrinsic brain activity is organized in spatial-temporal patterns, called resting-state networks (RSNs), exhibiting specific structural-functional architecture. These networks presumably reflect complex neurophysiological processes and have a central role in distinct perceptual and cognitive functions. In this work, we propose an innovative approach for characterizing RSNs according to their underlying neural oscillations. We investigated specific electrophysiological properties, including spectral features, fractal dimension, and entropy, associated with eight core RSNs derived from high-density electroencephalography (EEG) source-reconstructed signals. Specifically, we found higher synchronization of the gamma-band activity and higher fractal dimension values in perceptual (PNs) compared with higher cognitive (HCNs) networks. The inspection of this underlying rapid activity becomes of utmost importance for assessing possible alterations related to specific brain disorders. The disruption of the coordinated activity of RSNs may result in altered behavioral and perceptual states. Thus, this approach could potentially be used for the early detection and treatment of neurological disorders.
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Affiliation(s)
- Marco Marino
- Research Center for Motor Control and Neuroplasticity, KU Leuven, Leuven, Belgium.,Department of Experimental Psychology, University of Oxford, Oxford, United Kingdom
| | - Quanying Liu
- Research Center for Motor Control and Neuroplasticity, KU Leuven, Leuven, Belgium.,Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California.,Neurosciences, Huntington Medical Research Institutes, Pasadena, California
| | - Jessica Samogin
- Research Center for Motor Control and Neuroplasticity, KU Leuven, Leuven, Belgium
| | - Franca Tecchio
- ISTC-CNR, Rome, Italy.,Fondazione Policlinico Gemelli IRCCS, Rome, Italy
| | | | - Dante Mantini
- Research Center for Motor Control and Neuroplasticity, KU Leuven, Leuven, Belgium.,Functional Neuroimaging Laboratory, Fondazione Ospedale San Camillo, IRCCS, Venezia, Italy
| | - Camillo Porcaro
- Research Center for Motor Control and Neuroplasticity, KU Leuven, Leuven, Belgium.,ISTC-CNR, Rome, Italy.,Centre for Human Brain Health and School of Psychology, University of Birmingham, Birmingham, United Kingdom.,Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy.,S. Anna Institute and Research in Advanced Neurorehabilitation (RAN) Crotone, Italy
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31
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Emotional language production: Time course, behavioral and electrophysiological correlates. Neuropsychologia 2018; 117:241-252. [DOI: 10.1016/j.neuropsychologia.2018.05.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Revised: 05/27/2018] [Accepted: 05/28/2018] [Indexed: 11/15/2022]
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32
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Porcaro C, Cottone C, Cancelli A, Salustri C, Tecchio F. Functional Semi-Blind Source Separation Identifies Primary Motor Area Without Active Motor Execution. Int J Neural Syst 2018; 28:1750047. [DOI: 10.1142/s0129065717500472] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
High time resolution techniques are crucial for investigating the brain in action. Here, we propose a method to identify a section of the upper-limb motor area representation (FS_M1) by means of electroencephalographic (EEG) signals recorded during a completely passive condition (FS_M1bySS). We delivered a galvanic stimulation to the median nerve and we applied to EEG the semi-Blind Source Separation (s-BSS) algorithm named Functional Source Separation (FSS). In order to prove that FS_M1bySS is part of FS_M1, we also collected EEG in a motor condition, i.e. during a voluntary movement task (isometric handgrip) and in a rest condition, i.e. at rest with eyes open and closed. In motor condition, we show that the cortico-muscular coherence (CMC) of FS_M1bySS does not differ from FS_ M1 CMC (0.04 for both sources). Moreover, we show that the FS_M1bySS’s ongoing whole band activity during Motor and both rest conditions displays high mutual information and time correlation with FS_M1 (above 0.900 and 0.800, respectively) whereas much smaller ones with the primary somatosensory cortex [Formula: see text] (about 0.300 and 0.500, [Formula: see text]). FS_M1bySS as a marker of the upper-limb FS_M1 representation obtainable without the execution of an active motor task is a great achievement of the FSS algorithm, relevant in most experimental, neurological and psychiatric protocols.
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Affiliation(s)
- Camillo Porcaro
- LET’S - ISTC - CNR, Rome 00185, Italy
- Movement Control and Neuroplasticity Research Group, Department of Kinesiology, KU Leuven, Leuven 3001, Belgium
- Birmingham University Imaging Centre (BUIC), School of Psychology, University of Birmingham, Birmingham B15 2TT, UK
- Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy
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Variation in the speech signal as a window into the cognitive architecture of language production. Psychon Bull Rev 2018; 25:1973-2004. [PMID: 29383571 DOI: 10.3758/s13423-017-1423-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The pronunciation of words is highly variable. This variation provides crucial information about the cognitive architecture of the language production system. This review summarizes key empirical findings about variation phenomena, integrating corpus, acoustic, articulatory, and chronometric data from phonetic and psycholinguistic studies. It examines how these data constrain our current understanding of word production processes and highlights major challenges and open issues that should be addressed in future research.
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34
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Kuperberg GR, Delaney-Busch N, Fanucci K, Blackford T. Priming production: Neural evidence for enhanced automatic semantic activity preceding language production in schizophrenia. NEUROIMAGE-CLINICAL 2017; 18:74-85. [PMID: 29387525 PMCID: PMC5789757 DOI: 10.1016/j.nicl.2017.12.026] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Revised: 11/27/2017] [Accepted: 12/19/2017] [Indexed: 10/25/2022]
Abstract
Introduction Lexico-semantic disturbances are considered central to schizophrenia. Clinically, their clearest manifestation is in language production. However, most studies probing their underlying mechanisms have used comprehension or categorization tasks. Here, we probed automatic semantic activity prior to language production in schizophrenia using event-related potentials (ERPs). Methods 19 people with schizophrenia and 16 demographically-matched healthy controls named target pictures that were very quickly preceded by masked prime words. To probe automatic semantic activity prior to production, we measured the N400 ERP component evoked by these targets. To determine the origin of any automatic semantic abnormalities, we manipulated the type of relationship between prime and target such that they overlapped in (a) their semantic features (semantically related, e.g. "cake" preceding a < picture of a pie >, (b) their initial phonemes (phonemically related, e.g. "stomach" preceding a < picture of a starfish >), or (c) both their semantic features and their orthographic/phonological word form (identity related, e.g. "socks" preceding a < picture of socks >). For each of these three types of relationship, the same targets were paired with unrelated prime words (counterbalanced across lists). We contrasted ERPs and naming times to each type of related target with its corresponding unrelated target. Results People with schizophrenia showed abnormal N400 modulation prior to naming identity related (versus unrelated) targets: whereas healthy control participants produced a smaller amplitude N400 to identity related than unrelated targets, patients showed the opposite pattern, producing a larger N400 to identity related than unrelated targets. This abnormality was specific to the identity related targets. Just like healthy control participants, people with schizophrenia produced a smaller N400 to semantically related than to unrelated targets, and showed no difference in the N400 evoked by phonemically related and unrelated targets. There were no differences between the two groups in the pattern of naming times across conditions. Conclusion People with schizophrenia can show abnormal neural activity associated with automatic semantic processing prior to language production. The specificity of this abnormality to the identity related targets suggests that that, rather than arising from abnormalities of either semantic features or lexical form alone, it may stem from disruptions of mappings (connections) between the meaning of words and their form.
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Affiliation(s)
- Gina R Kuperberg
- Department of Psychology, Tufts University, United States; Department of Psychiatry and the Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, United States.
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35
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Blanco-Elorrieta E, Ferreira VS, Del Prato P, Pylkkänen L. The priming of basic combinatory responses in MEG. Cognition 2017; 170:49-63. [PMID: 28942354 DOI: 10.1016/j.cognition.2017.09.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 09/14/2017] [Accepted: 09/15/2017] [Indexed: 10/18/2022]
Abstract
Priming has been a powerful tool for the study of human memory and especially the memory representations relevant for language. However, although it is well established that lexical access can be primed, we do not know exactly what types of computations can be primed above the word level. This work took a neurobiological approach and assessed the ways in which the complex representation of a minimal combinatory phrase, such as red boat, can be primed, as evidenced by the spatiotemporal profiles of magnetoencephalography (MEG) signals. Specifically, we built upon recent progress on the neural signatures of phrasal composition and tested whether the brain activities implicated for the basic combination of two words could be primed. In two experiments, MEG was recorded during a picture naming task where the prime trials were designed to replicate previously reported combinatory effects and the target trials to test whether those combinatory effects could be primed. The manipulation of the primes was successful in eliciting larger activity for adjective-noun combinations than single nouns in left anterior temporal and ventromedial prefrontal cortices, replicating prior MEG studies on parallel contrasts. Priming of similarly timed activity was observed during target trials in anterior temporal cortex, but only when the prime and target shared an adjective. No priming in temporal cortex was observed for single word repetition and two control tasks showed that the priming effect was not elicited if the prime pictures were simply viewed but not named. In sum, this work provides evidence that very basic combinatory operations can be primed, with the necessity for some lexical overlap between prime and target suggesting combinatory conceptual, as opposed to syntactic processing. Both our combinatory and priming effects were early, onsetting between 100 and 150ms after picture onset and thus are likely to reflect the very earliest planning stages of a combinatory message. Thus our findings suggest that at the earliest stages of combinatory planning in production, a combinatory memory representation is formed that affects the planning of a relevantly similar combination on a subsequent trial.
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Affiliation(s)
- Esti Blanco-Elorrieta
- Department of Psychology, New York University, New York, NY 10003, USA; NYUAD Institute, New York University Abu Dhabi, Abu Dhabi, P.O. Box 129188, United Arab Emirates
| | - Victor S Ferreira
- Department of Psychology, University of California, San Diego, La Jolla, CA 92093-0109, USA
| | - Paul Del Prato
- Department of Psychology, New York University, New York, NY 10003, USA
| | - Liina Pylkkänen
- Department of Psychology, New York University, New York, NY 10003, USA; NYUAD Institute, New York University Abu Dhabi, Abu Dhabi, P.O. Box 129188, United Arab Emirates; Department of Linguistics, New York University, New York, NY 10003, USA.
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36
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Fargier R, Bürki A, Pinet S, Alario FX, Laganaro M. Word onset phonetic properties and motor artifacts in speech production EEG recordings. Psychophysiology 2017; 55. [DOI: 10.1111/psyp.12982] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 06/27/2017] [Accepted: 07/18/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Raphaël Fargier
- Faculty of Psychology and Educational Sciences (FPSE); University of Geneva; Geneva Switzerland
| | - Audrey Bürki
- Faculty of Psychology and Educational Sciences (FPSE); University of Geneva; Geneva Switzerland
- Cognitive Sciences, Department of Linguistics; University of Potsdam; Potsdam Germany
| | - Svetlana Pinet
- Department of Neurology, School of Medicine; Johns Hopkins University; Baltimore Maryland USA
- Aix-Marseille Université, CNRS, LPC; Marseille France
| | | | - Marina Laganaro
- Faculty of Psychology and Educational Sciences (FPSE); University of Geneva; Geneva Switzerland
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37
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Inter-study and inter-Individual Consistency and Variability of EEG/ERP Microstate Sequences in Referential Word Production. Brain Topogr 2017; 30:785-796. [DOI: 10.1007/s10548-017-0580-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 07/21/2017] [Indexed: 10/19/2022]
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Wang J, Wong AWK, Wang S, Chen HC. Primary phonological planning units in spoken word production are language-specific: Evidence from an ERP study. Sci Rep 2017; 7:5815. [PMID: 28724982 PMCID: PMC5517664 DOI: 10.1038/s41598-017-06186-z] [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: 03/03/2017] [Accepted: 05/25/2017] [Indexed: 11/24/2022] Open
Abstract
It is widely acknowledged in Germanic languages that segments are the primary planning units at the phonological encoding stage of spoken word production. Mixed results, however, have been found in Chinese, and it is still unclear what roles syllables and segments play in planning Chinese spoken word production. In the current study, participants were asked to first prepare and later produce disyllabic Mandarin words upon picture prompts and a response cue while electroencephalogram (EEG) signals were recorded. Each two consecutive pictures implicitly formed a pair of prime and target, whose names shared the same word-initial atonal syllable or the same word-initial segments, or were unrelated in the control conditions. Only syllable repetition induced significant effects on event-related brain potentials (ERPs) after target onset: a widely distributed positivity in the 200- to 400-ms interval and an anterior positivity in the 400- to 600-ms interval. We interpret these to reflect syllable-size representations at the phonological encoding and phonetic encoding stages. Our results provide the first electrophysiological evidence for the distinct role of syllables in producing Mandarin spoken words, supporting a language specificity hypothesis about the primary phonological units in spoken word production.
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Affiliation(s)
- Jie Wang
- Department of Psychology, The Chinese University of Hong Kong, Hong Kong S.A.R., China
| | - Andus Wing-Kuen Wong
- Nam Shan Psychology Laboratory, Department of Applied Social Sciences, City University of Hong Kong, Hong Kong S.A.R., China
| | - Suiping Wang
- Department of Psychology, South China Normal University, Guangzhou, 510631, China
| | - Hsuan-Chih Chen
- Department of Psychology, The Chinese University of Hong Kong, Hong Kong S.A.R., China.
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Bürki A. Electrophysiological characterization of facilitation and interference in the picture-word interference paradigm. Psychophysiology 2017; 54:1370-1392. [PMID: 28470728 DOI: 10.1111/psyp.12885] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 03/30/2017] [Accepted: 03/30/2017] [Indexed: 11/28/2022]
Abstract
The picture-word interference paradigm is often used to investigate the processes underlying word production. In this paradigm, participants name pictures while ignoring distractor words. The aim of this study is to investigate the processes underlying this task and how/when they differ from those involved in simple picture naming. It examines the electrophysiological signature of general interference (longer response times with than without distractors) and facilitation (shorter response times for distractor-word stimuli overlapping in phonemes/orthography) effects. Mass univariate analyses are used to determine the temporal boundaries and spatial distribution of these effects without a priori restrictions in the time/space dimensions. Topographic pattern analyses complement this information by indicating whether (and when) the neural networks differ across conditions. Results suggest that the general interference effect has two loci, the grammatical encoding and the phonological encoding of the target word, with different neural networks involved in the two tasks during part of the grammatical encoding process. Furthermore, the electrophysiological signature of interference and facilitation effects in the time window of phonological encoding is highly similar, suggesting that the two effects could result from the same underlying mechanism. These findings are discussed in the light of existing accounts of interference and facilitation effects.
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Affiliation(s)
- Audrey Bürki
- Methodology and Data Analysis/Psycholinguistics, Faculté de Psychologie et des Sciences de l'Education, University of Geneva, Geneva, Switzerland.,Cognitive Sciences, University of Potsdam, Potsdam, Germany
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Buyukturkoglu K, Porcaro C, Cottone C, Cancelli A, Inglese M, Tecchio F. Simple index of functional connectivity at rest in Multiple Sclerosis fatigue. Clin Neurophysiol 2017; 128:807-813. [DOI: 10.1016/j.clinph.2017.02.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 02/02/2017] [Accepted: 02/14/2017] [Indexed: 11/28/2022]
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Exploiting the intra-subject latency variability from single-trial event-related potentials in the P3 time range: A review and comparative evaluation of methods. Neurosci Biobehav Rev 2017; 75:1-21. [DOI: 10.1016/j.neubiorev.2017.01.023] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2016] [Revised: 01/13/2017] [Accepted: 01/19/2017] [Indexed: 11/17/2022]
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Minguillon J, Lopez-Gordo MA, Pelayo F. Trends in EEG-BCI for daily-life: Requirements for artifact removal. Biomed Signal Process Control 2017. [DOI: 10.1016/j.bspc.2016.09.005] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Shapira-Lichter I, Klovatch I, Nathan D, Oren N, Hendler T. Task-specific Aspects of Goal-directed Word Generation Identified via Simultaneous EEG–fMRI. J Cogn Neurosci 2016; 28:1406-18. [DOI: 10.1162/jocn_a_00976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Abstract
Generating words according to a given rule relies on retrieval-related search and postretrieval control processes. Using fMRI, we recently characterized neural patterns of word generation in response to episodic, semantic, and phonemic cues by comparing free recall of wordlists, category fluency, and letter fluency [Shapira-Lichter, I., Oren, N., Jacob, Y., Gruberger, M., & Hendler, T. Portraying the unique contribution of the default mode network to internally driven mnemonic processes. Proceedings of the National Academy of Sciences, U.S.A., 110, 4950–4955, 2013]. Distinct selectivity for each condition was evident, representing discrete aspects of word generation-related memory retrieval. For example, the precuneus, implicated in processing spatiotemporal information, emerged as a key contributor to the episodic condition, which uniquely requires this information. Gamma band is known to play a central role in memory, and increased gamma power has been observed before word generation. Yet, gamma modulation in response to task demands has not been investigated. To capture the task-specific modulation of gamma power, we analyzed the EEG data recorded simultaneously with the aforementioned fMRI, focusing on the activity locked to and immediately preceding word articulation. Transient increases in gamma power were identified in a parietal electrode immediately before episodic and semantic word generation, however, within a different time frame relative to articulation. Gamma increases were followed by an alpha-theta decrease in the episodic condition, a gamma decrease in the semantic condition. This pattern indicates a task-specific modulation of the gamma signal corresponding to the specific demands of each word generation task. The gamma power and fMRI signal from the precuneus were correlated during the episodic condition, implying the existence of a common cognitive construct uniquely required for this task, possibly the reactivation or processing of spatiotemporal information.
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Affiliation(s)
| | | | | | - Noga Oren
- 1Tel-Aviv Sourasky Medical Center
- 2Tel-Aviv University
| | - Talma Hendler
- 1Tel-Aviv Sourasky Medical Center
- 2Tel-Aviv University
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Ouyang G, Sommer W, Zhou C, Aristei S, Pinkpank T, Abdel Rahman R. Articulation Artifacts During Overt Language Production in Event-Related Brain Potentials: Description and Correction. Brain Topogr 2016; 29:791-813. [DOI: 10.1007/s10548-016-0515-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2016] [Accepted: 08/03/2016] [Indexed: 10/21/2022]
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Wakui E, Thoma V, de Fockert JW. View-sensitive ERP repetition effects indicate automatic holistic processing of spatially unattended objects. Neuropsychologia 2016; 89:426-436. [DOI: 10.1016/j.neuropsychologia.2016.07.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 06/17/2016] [Accepted: 07/19/2016] [Indexed: 11/24/2022]
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Cancelli A, Cottone C, Tecchio F, Truong DQ, Dmochowski J, Bikson M. A simple method for EEG guided transcranial electrical stimulation without models. J Neural Eng 2016; 13:036022. [PMID: 27172063 DOI: 10.1088/1741-2560/13/3/036022] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVE There is longstanding interest in using EEG measurements to inform transcranial Electrical Stimulation (tES) but adoption is lacking because users need a simple and adaptable recipe. The conventional approach is to use anatomical head-models for both source localization (the EEG inverse problem) and current flow modeling (the tES forward model), but this approach is computationally demanding, requires an anatomical MRI, and strict assumptions about the target brain regions. We evaluate techniques whereby tES dose is derived from EEG without the need for an anatomical head model, target assumptions, difficult case-by-case conjecture, or many stimulation electrodes. APPROACH We developed a simple two-step approach to EEG-guided tES that based on the topography of the EEG: (1) selects locations to be used for stimulation; (2) determines current applied to each electrode. Each step is performed based solely on the EEG with no need for head models or source localization. Cortical dipoles represent idealized brain targets. EEG-guided tES strategies are verified using a finite element method simulation of the EEG generated by a dipole, oriented either tangential or radial to the scalp surface, and then simulating the tES-generated electric field produced by each model-free technique. These model-free approaches are compared to a 'gold standard' numerically optimized dose of tES that assumes perfect understanding of the dipole location and head anatomy. We vary the number of electrodes from a few to over three hundred, with focality or intensity as optimization criterion. MAIN RESULTS Model-free approaches evaluated include (1) voltage-to-voltage, (2) voltage-to-current; (3) Laplacian; and two Ad-Hoc techniques (4) dipole sink-to-sink; and (5) sink to concentric. Our results demonstrate that simple ad hoc approaches can achieve reasonable targeting for the case of a cortical dipole, remarkably with only 2-8 electrodes and no need for a model of the head. SIGNIFICANCE Our approach is verified directly only for a theoretically localized source, but may be potentially applied to an arbitrary EEG topography. For its simplicity and linearity, our recipe for model-free EEG guided tES lends itself to broad adoption and can be applied to static (tDCS), time-variant (e.g., tACS, tRNS, tPCS), or closed-loop tES.
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Affiliation(s)
- Andrea Cancelli
- Laboratory of Electrophysiology for Translational neuroScience (LET'S)-ISTC-CNR, Italy. Institute of Neurology, Catholic University, Rome, Italy
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Smits FM, Porcaro C, Cottone C, Cancelli A, Rossini PM, Tecchio F. Electroencephalographic Fractal Dimension in Healthy Ageing and Alzheimer's Disease. PLoS One 2016; 11:e0149587. [PMID: 26872349 PMCID: PMC4752290 DOI: 10.1371/journal.pone.0149587] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 02/01/2016] [Indexed: 11/18/2022] Open
Abstract
Brain activity is complex; a reflection of its structural and functional organization. Among other measures of complexity, the fractal dimension is emerging as being sensitive to neuronal damage secondary to neurological and psychiatric diseases. Here, we calculated Higuchi’s fractal dimension (HFD) in resting-state eyes-closed electroencephalography (EEG) recordings from 41 healthy controls (age: 20–89 years) and 67 Alzheimer’s Disease (AD) patients (age: 50–88 years), to investigate whether HFD is sensitive to brain activity changes typical in healthy aging and in AD. Additionally, we considered whether AD-accelerating effects of the copper fraction not bound to ceruloplasmin (also called “free” copper) are reflected in HFD fluctuations. The HFD measure showed an inverted U-shaped relationship with age in healthy people (R2 = .575, p < .001). Onset of HFD decline appeared around the age of 60, and was most evident in central-parietal regions. In this region, HFD decreased with aging stronger in the right than in the left hemisphere (p = .006). AD patients demonstrated reduced HFD compared to age- and education-matched healthy controls, especially in temporal-occipital regions. This was associated with decreasing cognitive status as assessed by mini-mental state examination, and with higher levels of non-ceruloplasmin copper. Taken together, our findings show that resting-state EEG complexity increases from youth to maturity and declines in healthy, aging individuals. In AD, brain activity complexity is further reduced in correlation with cognitive impairment. In addition, elevated levels of non-ceruloplasmin copper appear to accelerate the reduction of neural activity complexity. Overall, HDF appears to be a proper indicator for monitoring EEG-derived brain activity complexity in healthy and pathological aging.
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Affiliation(s)
- Fenne Margreeth Smits
- LET’S—ISTC—CNR, Ospedale Fatebenefratelli, Isola Tiberina, Rome, Italy
- University of Amsterdam, Amsterdam, The Netherlands
| | - Camillo Porcaro
- LET’S—ISTC—CNR, Ospedale Fatebenefratelli, Isola Tiberina, Rome, Italy
- Institute of Neuroscience, Newcastle University, Medical School, Newcastle upon Tyne, United Kingdom
- Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy
| | - Carlo Cottone
- LET’S—ISTC—CNR, Ospedale Fatebenefratelli, Isola Tiberina, Rome, Italy
| | - Andrea Cancelli
- LET’S—ISTC—CNR, Ospedale Fatebenefratelli, Isola Tiberina, Rome, Italy
- Institute of Neurology, Cattolica del Sacro Cuore University, Rome, Italy
| | - Paolo Maria Rossini
- Institute of Neurology, Cattolica del Sacro Cuore University, Rome, Italy
- Unit of Neuroimaging, IRCCS San Raffaele Pisana, Rome, Italy
| | - Franca Tecchio
- LET’S—ISTC—CNR, Ospedale Fatebenefratelli, Isola Tiberina, Rome, Italy
- Unit of Neuroimaging, IRCCS San Raffaele Pisana, Rome, Italy
- * E-mail:
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