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Del Vecchio M, Bontemps B, Lance F, Gannerie A, Sipp F, Albertini D, Cassani CM, Chatard B, Dupin M, Lachaux JP. Introducing HiBoP: a Unity-based visualization software for large iEEG datasets. J Neurosci Methods 2024; 409:110179. [PMID: 38823595 DOI: 10.1016/j.jneumeth.2024.110179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 05/02/2024] [Accepted: 05/22/2024] [Indexed: 06/03/2024]
Abstract
BACKGROUND Intracranial EEG data offer a unique spatio-temporal precision to investigate human brain functions. Large datasets have become recently accessible thanks to new iEEG data-sharing practices and tighter collaboration with clinicians. Yet, the complexity of such datasets poses new challenges, especially regarding the visualization and anatomical display of iEEG. NEW METHOD We introduce HiBoP, a multi-modal visualization software specifically designed for large groups of patients and multiple experiments. Its main features include the dynamic display of iEEG responses induced by tasks/stimulations, the definition of Regions and electrodes Of Interest, and the shift between group-level and individual-level 3D anatomo-functional data. RESULTS We provide a use-case with data from 36 patients to reveal the global cortical dynamics following tactile stimulation. We used HiBoP to visualize high-gamma responses [50-150 Hz], and define three major response components in primary somatosensory and premotor cortices and parietal operculum. COMPARISON WITH EXISTING METHODS(S) Several iEEG softwares are now publicly available with outstanding analysis features. Yet, most were developed in languages (Python/Matlab) chosen to facilitate the inclusion of new analysis by users, rather than the quality of the visualization. HiBoP represents a visualization tool developed with videogame standards (Unity/C#), and performs detailed anatomical analysis rapidly, across multiple conditions, patients, and modalities with an easy export toward third-party softwares. CONCLUSION HiBoP provides a user-friendly environment that greatly facilitates the exploration of large iEEG datasets, and helps users decipher subtle structure/function relationships.
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Affiliation(s)
- Maria Del Vecchio
- Istituto di Neuroscienze, Consiglio Nazionale delle Ricerche, Parma 43125, Italy
| | - Benjamin Bontemps
- Lyon Neuroscience Research Center, EDUWELL team, INSERM UMRS 1028, CNRS UMR 5292, Université Claude Bernard Lyon 1, Université de Lyon, Lyon F-69000, France
| | - Florian Lance
- Lyon Neuroscience Research Center, EDUWELL team, INSERM UMRS 1028, CNRS UMR 5292, Université Claude Bernard Lyon 1, Université de Lyon, Lyon F-69000, France
| | - Adrien Gannerie
- Lyon Neuroscience Research Center, EDUWELL team, INSERM UMRS 1028, CNRS UMR 5292, Université Claude Bernard Lyon 1, Université de Lyon, Lyon F-69000, France
| | - Florian Sipp
- Lyon Neuroscience Research Center, EDUWELL team, INSERM UMRS 1028, CNRS UMR 5292, Université Claude Bernard Lyon 1, Université de Lyon, Lyon F-69000, France
| | - Davide Albertini
- Dipartimento di Medicina e Chirurgia, Università di Parma, Via Volturno 39, Parma 43125, Italy
| | - Chiara Maria Cassani
- Istituto di Neuroscienze, Consiglio Nazionale delle Ricerche, Parma 43125, Italy; Department of School of Advanced Studies, University of Camerino, Italy
| | - Benoit Chatard
- Lyon Neuroscience Research Center, EDUWELL team, INSERM UMRS 1028, CNRS UMR 5292, Université Claude Bernard Lyon 1, Université de Lyon, Lyon F-69000, France
| | - Maryne Dupin
- Lyon Neuroscience Research Center, EDUWELL team, INSERM UMRS 1028, CNRS UMR 5292, Université Claude Bernard Lyon 1, Université de Lyon, Lyon F-69000, France
| | - Jean-Philippe Lachaux
- Lyon Neuroscience Research Center, EDUWELL team, INSERM UMRS 1028, CNRS UMR 5292, Université Claude Bernard Lyon 1, Université de Lyon, Lyon F-69000, France.
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Combrisson E, Di Rienzo F, Saive AL, Perrone-Bertolotti M, Soto JLP, Kahane P, Lachaux JP, Guillot A, Jerbi K. Human local field potentials in motor and non-motor brain areas encode upcoming movement direction. Commun Biol 2024; 7:506. [PMID: 38678058 PMCID: PMC11055917 DOI: 10.1038/s42003-024-06151-3] [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: 09/15/2023] [Accepted: 04/05/2024] [Indexed: 04/29/2024] Open
Abstract
Limb movement direction can be inferred from local field potentials in motor cortex during movement execution. Yet, it remains unclear to what extent intended hand movements can be predicted from brain activity recorded during movement planning. Here, we set out to probe the directional-tuning of oscillatory features during motor planning and execution, using a machine learning framework on multi-site local field potentials (LFPs) in humans. We recorded intracranial EEG data from implanted epilepsy patients as they performed a four-direction delayed center-out motor task. Fronto-parietal LFP low-frequency power predicted hand-movement direction during planning while execution was largely mediated by higher frequency power and low-frequency phase in motor areas. By contrast, Phase-Amplitude Coupling showed uniform modulations across directions. Finally, multivariate classification led to an increase in overall decoding accuracy (>80%). The novel insights revealed here extend our understanding of the role of neural oscillations in encoding motor plans.
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Affiliation(s)
- Etienne Combrisson
- Psychology Department, University of Montreal, Montreal, QC, Canada.
- University of Lyon, UCBL-Lyon 1, Laboratoire Interuniversitaire de Biologie de la Motricité UR 7424, F-69622, Villeurbanne, France.
- Institut de Neurosciences de la Timone, Aix Marseille Université, UMR 7289 CNRS, 13005, Marseille, France.
| | - Franck Di Rienzo
- University of Lyon, UCBL-Lyon 1, Laboratoire Interuniversitaire de Biologie de la Motricité UR 7424, F-69622, Villeurbanne, France
| | - Anne-Lise Saive
- Psychology Department, University of Montreal, Montreal, QC, Canada
- Cognitive Science Department, Lyfe Research and Innovation Center, Ecully, France
| | | | - Juan L P Soto
- Telecommunications and Control Engineering Department, University of Sao Paulo, Sao Paulo, Brazil
| | - Philippe Kahane
- Université Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Grenoble Institut Neurosciences, GIN, Grenoble, France
| | - Jean-Philippe Lachaux
- Lyon Neuroscience Research Center, EDUWELL team, INSERM UMRS 1028, CNRS UMR 5292, Université Claude Bernard Lyon 1, Université de Lyon, F-69000, Lyon, France
| | - Aymeric Guillot
- University of Lyon, UCBL-Lyon 1, Laboratoire Interuniversitaire de Biologie de la Motricité UR 7424, F-69622, Villeurbanne, France
| | - Karim Jerbi
- Psychology Department, University of Montreal, Montreal, QC, Canada.
- Mila (Quebec AI Institute), montreal, QC, Canada.
- UNIQUE Centre (Quebec Neuro-AI research Center), Montreal, QC, Canada.
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3
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Kujala J, Mäkelä S, Ojala P, Hyönä J, Salmelin R. Beta- and gamma-band cortico-cortical interactions support naturalistic reading of continuous text. Eur J Neurosci 2024; 59:238-251. [PMID: 38062542 DOI: 10.1111/ejn.16212] [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: 05/08/2023] [Revised: 11/06/2023] [Accepted: 11/15/2023] [Indexed: 01/23/2024]
Abstract
Large-scale integration of information across cortical structures, building on neural connectivity, has been proposed to be a key element in supporting human cognitive processing. In electrophysiological neuroimaging studies of reading, quantification of neural interactions has been limited to the level of isolated words or sentences due to artefacts induced by eye movements. Here, we combined magnetoencephalography recording with advanced artefact rejection tools to investigate both cortico-cortical coherence and directed neural interactions during naturalistic reading of full-page texts. Our results show that reading versus visual scanning of text was associated with wide-spread increases of cortico-cortical coherence in the beta and gamma bands. We further show that the reading task was linked to increased directed neural interactions compared to the scanning task across a sparse set of connections within a wide range of frequencies. Together, the results demonstrate that neural connectivity flexibly builds on different frequency bands to support continuous natural reading.
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Affiliation(s)
- Jan Kujala
- Department of Psychology, University of Jyväskylä, Jyväskylä, Finland
- Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland
| | - Sasu Mäkelä
- Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland
| | - Pauliina Ojala
- Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland
- Aalto NeuroImaging, Aalto University, Espoo, Finland
| | - Jukka Hyönä
- Department of Psychology and Speech-Language Pathology, University of Turku, Turku, Finland
| | - Riitta Salmelin
- Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland
- Aalto NeuroImaging, Aalto University, Espoo, Finland
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Mercier MR, Dubarry AS, Tadel F, Avanzini P, Axmacher N, Cellier D, Vecchio MD, Hamilton LS, Hermes D, Kahana MJ, Knight RT, Llorens A, Megevand P, Melloni L, Miller KJ, Piai V, Puce A, Ramsey NF, Schwiedrzik CM, Smith SE, Stolk A, Swann NC, Vansteensel MJ, Voytek B, Wang L, Lachaux JP, Oostenveld R. Advances in human intracranial electroencephalography research, guidelines and good practices. Neuroimage 2022; 260:119438. [PMID: 35792291 DOI: 10.1016/j.neuroimage.2022.119438] [Citation(s) in RCA: 41] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 05/23/2022] [Accepted: 06/30/2022] [Indexed: 12/11/2022] Open
Abstract
Since the second-half of the twentieth century, intracranial electroencephalography (iEEG), including both electrocorticography (ECoG) and stereo-electroencephalography (sEEG), has provided an intimate view into the human brain. At the interface between fundamental research and the clinic, iEEG provides both high temporal resolution and high spatial specificity but comes with constraints, such as the individual's tailored sparsity of electrode sampling. Over the years, researchers in neuroscience developed their practices to make the most of the iEEG approach. Here we offer a critical review of iEEG research practices in a didactic framework for newcomers, as well addressing issues encountered by proficient researchers. The scope is threefold: (i) review common practices in iEEG research, (ii) suggest potential guidelines for working with iEEG data and answer frequently asked questions based on the most widespread practices, and (iii) based on current neurophysiological knowledge and methodologies, pave the way to good practice standards in iEEG research. The organization of this paper follows the steps of iEEG data processing. The first section contextualizes iEEG data collection. The second section focuses on localization of intracranial electrodes. The third section highlights the main pre-processing steps. The fourth section presents iEEG signal analysis methods. The fifth section discusses statistical approaches. The sixth section draws some unique perspectives on iEEG research. Finally, to ensure a consistent nomenclature throughout the manuscript and to align with other guidelines, e.g., Brain Imaging Data Structure (BIDS) and the OHBM Committee on Best Practices in Data Analysis and Sharing (COBIDAS), we provide a glossary to disambiguate terms related to iEEG research.
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Khan S, Hashmi JA, Mamashli F, Hämäläinen MS, Kenet T. Functional Significance of Human Resting-State Networks Hubs Identified Using MEG During the Transition From Childhood to Adulthood. Front Neurol 2022; 13:814940. [PMID: 35812111 PMCID: PMC9259855 DOI: 10.3389/fneur.2022.814940] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Accepted: 05/10/2022] [Indexed: 11/25/2022] Open
Abstract
Cortical hubs identified within resting-state networks (RSNs), areas of the cortex that have a higher-than-average number of connections, are known to be critical to typical cognitive functioning and are often implicated in disorders leading to abnormal cognitive functioning. Functionally defined cortical hubs are also known to change with age in the developing, maturing brain, mostly based on studies carried out using fMRI. We have recently used magnetoencephalography (MEG) to study the maturation trajectories of RSNs and their hubs from age 7 to 29 in 131 healthy participants with high temporal resolution. We found that maturation trajectories diverge as a function of the underlying cortical rhythm. Specifically, we found the beta band (13–30 Hz)-mediated RSNs became more locally efficient with maturation, i.e., more organized into clusters and connected with nearby regions, while gamma (31–80 Hz)-mediated RSNs became more globally efficient with maturation, i.e., prioritizing faster signal transmission between distant cortical regions. We also found that different sets of hubs were associated with each of these networks. To better understand the functional significance of this divergence, we wanted to examine the cortical functions associated with the identified hubs that grew or shrunk with maturation within each of these networks. To that end, we analyzed the results of the prior study using Neurosynth, a platform for large-scale, automated synthesis of fMRI data that links brain coordinates with their probabilistically associated terms. By mapping the Neurosynth terms associated with each of these hubs, we found that maturing hubs identified in the gamma band RSNs were more likely to be associated with bottom-up processes while maturing hubs identified in the beta band RSNs were more likely to be associated with top-down functions. The results were consistent with the idea that beta band-mediated networks preferentially support the maturation of top-down processing, while the gamma band-mediated networks preferentially support the maturation of bottom-up processing.
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Affiliation(s)
- Sheraz Khan
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States
- *Correspondence: Sheraz Khan
| | - Javeria Ali Hashmi
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States
- Department of Anesthesia, Pain Management, and Perioperative Medicine, Dalhousie University, Halifax, NS, Canada
| | - Fahimeh Mamashli
- Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States
| | - Matti S. Hämäläinen
- Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States
| | - Tal Kenet
- Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, United States
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States
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Dubarry AS, Liégeois-Chauvel C, Trébuchon A, Bénar C, Alario FX. An open-source toolbox for Multi-patient Intracranial EEG Analysis (MIA). Neuroimage 2022; 257:119251. [PMID: 35568349 DOI: 10.1016/j.neuroimage.2022.119251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 03/31/2022] [Accepted: 04/26/2022] [Indexed: 10/18/2022] Open
Abstract
Intracranial EEG (iEEG) performed during the pre-surgical evaluation of refractory epilepsy provides a great opportunity to investigate the neurophysiology of human cognitive functions with exceptional spatial and temporal precisions. A difficulty of the iEEG approach for cognitive neuroscience, however, is the potential variability across patients in the anatomical location of implantations and in the functional responses therein recorded. In this context, we designed, implemented, and tested a user-friendly and efficient open-source toolbox for Multi-Patient Intracranial data Analysis (MIA), which can be used as standalone program or as a Brainstorm plugin. MIA helps analyzing event related iEEG signals while following good scientific practice recommendations, such as building reproducible analysis pipelines and applying robust statistics. The signals can be analyzed in the temporal and time-frequency domains, and the similarity of time courses across patients or contacts can be assessed within anatomical regions. MIA allows visualizing all these results in a variety of formats at every step of the analysis. Here, we present the toolbox architecture and illustrate the different steps and features of the analysis pipeline using a group dataset collected during a language task.
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Affiliation(s)
- A-Sophie Dubarry
- Aix Marseille Univ, CNRS, LPL, Aix-en-Provence, France; Aix Marseille Univ, CNRS, LPC, Aix-en-Provence, France.
| | - Catherine Liégeois-Chauvel
- Cortical Systems Laboratory, University of Pittsburgh, Pennsylvania, USA; Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France
| | - Agnès Trébuchon
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France; APHM, Hôpital la Timone, Service Épileptologie et Rythmologie Cérébrale, Marseille, France
| | - Christian Bénar
- Aix Marseille Univ, INSERM, INS, Inst Neurosci Syst, Marseille, France
| | - F-Xavier Alario
- Aix Marseille Univ, CNRS, LPC, Aix-en-Provence, France; Cortical Systems Laboratory, University of Pittsburgh, Pennsylvania, USA
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7
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Mitsuhashi T, Sonoda M, Firestone E, Sakakura K, Jeong JW, Luat AF, Sood S, Asano E. Temporally and functionally distinct large-scale brain network dynamics supporting task switching. Neuroimage 2022; 254:119126. [PMID: 35331870 PMCID: PMC9173207 DOI: 10.1016/j.neuroimage.2022.119126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 02/25/2022] [Accepted: 03/20/2022] [Indexed: 11/04/2022] Open
Abstract
Objective: Our daily activities require frequent switches among competing responses at the millisecond time scale. We determined the spatiotemporal characteristics and functional significance of rapid, large-scale brain network dynamics during task switching. Methods: This cross-sectional study investigated patients with drug-resistant focal epilepsy who played a Lumosity cognitive flexibility training game during intracranial electroencephalography (iEEG) recording. According to a given task rule, unpredictably switching across trials, participants had to swipe the screen in the direction the stimulus was pointing or moving. Using this data, we described the spatiotemporal characteristics of iEEG high-gamma augmentation occurring more intensely during switch than repeat trials, unattributable to the effect of task rule (pointing or moving), within-stimulus congruence (the direction of stimulus pointing and moving was same or different in a given trial), or accuracy of an immediately preceding response. Diffusion-weighted imaging (DWI) tractography determined whether distant cortical regions showing enhanced activation during task switch trials were directly connected by white matter tracts. Trial-by-trial iEEG analysis deduced whether the intensity of task switch-related high-gamma augmentation was altered through practice and whether high-gamma amplitude predicted the accuracy of an upcoming response among switch trials. Results: The average number of completed trials during five-minute gameplay was 221.4 per patient (range: 171–285). Task switch trials increased the response times, whereas later trials reduced them. Analysis of iEEG signals sampled from 860 brain sites effectively elucidated the distinct spatiotemporal characteristics of task switch, task rule, and post-error-specific high-gamma modulations. Post-cue, task switch-related high-gamma augmentation was initiated in the right calcarine cortex after 260 ms, right precuneus after 330 ms, right entorhinal after 420 ms, and bilateral anterior middle-frontal gyri after 450 ms. DWI tractography successfully showed the presence of direct white matter tracts connecting the right visual areas to the precuneus and anterior middle-frontal regions but not between the right precuneus and anterior middle-frontal regions. Task-related high-gamma amplitudes in later trials were reduced in the calcarine, entorhinal and anterior middle-frontal regions, but increased in the precuneus. Functionally, enhanced post-cue precuneus high-gamma augmentation improved the accuracy of subsequent responses among switch trials. Conclusions: Our multimodal analysis uncovered two temporally and functionally distinct network dynamics supporting task switching. High-gamma augmentation in the visual-precuneus pathway may reflect the neural process facilitating an attentional shift to a given updated task rule. High-gamma activity in the visual-dorsolateral prefrontal pathway, rapidly reduced through practice, may reflect the cost of executing appropriate stimulus-response translation.
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Affiliation(s)
- Takumi Mitsuhashi
- Department of Pediatrics, Children's Hospital of Michigan, Detroit Medical Center, Wayne State University, Detroit, MI, 48201, USA; Department of Neurosurgery, Juntendo University, Tokyo, 1138421, Japan
| | - Masaki Sonoda
- Department of Pediatrics, Children's Hospital of Michigan, Detroit Medical Center, Wayne State University, Detroit, MI, 48201, USA; Department of Neurosurgery, Yokohama City University, Yokohama, 2360004, Japan
| | - Ethan Firestone
- Department of Pediatrics, Children's Hospital of Michigan, Detroit Medical Center, Wayne State University, Detroit, MI, 48201, USA; Department of Physiology, Wayne State University, Detroit, MI 48201, USA
| | - Kazuki Sakakura
- Department of Pediatrics, Children's Hospital of Michigan, Detroit Medical Center, Wayne State University, Detroit, MI, 48201, USA; Department of Neurosurgery, University of Tsukuba, Tsukuba, 3058575, Japan
| | - Jeong-Won Jeong
- Department of Pediatrics, Children's Hospital of Michigan, Detroit Medical Center, Wayne State University, Detroit, MI, 48201, USA; Department of Neurology, Children's Hospital of Michigan, Detroit Medical Center, Wayne State University, Detroit, MI, 48201, USA
| | - Aimee F Luat
- Department of Pediatrics, Children's Hospital of Michigan, Detroit Medical Center, Wayne State University, Detroit, MI, 48201, USA; Department of Neurology, Children's Hospital of Michigan, Detroit Medical Center, Wayne State University, Detroit, MI, 48201, USA; Department of Pediatrics, Central Michigan University, Mount Pleasant, MI, 48858, USA
| | - Sandeep Sood
- Department of Neurosurgery, Children's Hospital of Michigan, Detroit Medical Center, Wayne State University, Detroit, MI, 48201, USA
| | - Eishi Asano
- Department of Pediatrics, Children's Hospital of Michigan, Detroit Medical Center, Wayne State University, Detroit, MI, 48201, USA; Department of Neurology, Children's Hospital of Michigan, Detroit Medical Center, Wayne State University, Detroit, MI, 48201, USA.
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Bauer PR, Sabourdy C, Chatard B, Rheims S, Lachaux JP, Vidal JR, Lutz A. Neural dynamics of mindfulness meditation and hypnosis explored with intracranial EEG: A feasibility study. Neurosci Lett 2022; 766:136345. [PMID: 34785313 DOI: 10.1016/j.neulet.2021.136345] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 10/26/2021] [Accepted: 11/09/2021] [Indexed: 12/17/2022]
Abstract
PURPOSE Intracranial electroencephalography (iEEG) offers a unique window on brain dynamics with excellent temporal and spatial resolution and is less prone to recording artefacts than surface EEG. This study used a within-subject design to explore the feasibility to compare iEEG data during mind wandering, mindfulness meditation and hypnosis. RESULTS Three patients who had iEEG for clinical monitoring and who were new to mindfulness meditation and hypnosis were able to enter these states. We found non-specific and wide-spread amplitude modulations. Data-driven connectivity analysis revealed widespread connectivity patterns that were common across the three conditions. These were predominant in the low frequencies (delta, theta and alpha) and characterised by positively correlated activity. Connectivity patterns that were unique to the three conditions predominated in the gamma band, one third of the correlations in these patterns were negative. CONCLUSIONS This study is the first to support the feasibility of a direct comparison of the neural correlates of mindfulness meditation and hypnosis using iEEG. These modulations may reflect the complex interplay between different known brain networks, and warrant further functional investigations in particular in the gamma band.
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Affiliation(s)
- Prisca R Bauer
- Lyon Neuroscience Research Center, INSERM U1028 - CNRS UMR5292 -Lyon 1 University, Centre Hospitalier Le Vinatier (Bât. 462) - Neurocampus, 95 Bd Pinel, 69675 Bron cédex, France; Department of Psychosomatic Medicine and Psychotherapy University Medical Center Freiburg, Faculty of Medicine, University of Freiburg Freiburg, Germany.
| | - Cécile Sabourdy
- Neurophysiology Unit, Division of Neurology, Grenoble Alpes University, Grenoble, France
| | - Benoît Chatard
- Lyon Neuroscience Research Center, INSERM U1028 - CNRS UMR5292 -Lyon 1 University, Centre Hospitalier Le Vinatier (Bât. 462) - Neurocampus, 95 Bd Pinel, 69675 Bron cédex, France
| | - Sylvain Rheims
- Lyon Neuroscience Research Center, INSERM U1028 - CNRS UMR5292 -Lyon 1 University, Centre Hospitalier Le Vinatier (Bât. 462) - Neurocampus, 95 Bd Pinel, 69675 Bron cédex, France; Department of Functional Neurology and Epileptology, Hospices Civils de Lyon and Lyon 1 University, Lyon, France
| | - Jean-Philippe Lachaux
- Lyon Neuroscience Research Center, INSERM U1028 - CNRS UMR5292 -Lyon 1 University, Centre Hospitalier Le Vinatier (Bât. 462) - Neurocampus, 95 Bd Pinel, 69675 Bron cédex, France
| | - Juan R Vidal
- Catholic University of Lyon, Sciences and Humanities Confluence Research Center, 2 Place des Archives, 69002 Lyon, France
| | - Antoine Lutz
- Lyon Neuroscience Research Center, INSERM U1028 - CNRS UMR5292 -Lyon 1 University, Centre Hospitalier Le Vinatier (Bât. 462) - Neurocampus, 95 Bd Pinel, 69675 Bron cédex, France
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9
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Liu S, Li G, Jiang S, Wu X, Hu J, Zhang D, Chen L. Investigating Data Cleaning Methods to Improve Performance of Brain-Computer Interfaces Based on Stereo-Electroencephalography. Front Neurosci 2021; 15:725384. [PMID: 34690673 PMCID: PMC8528199 DOI: 10.3389/fnins.2021.725384] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 09/01/2021] [Indexed: 11/13/2022] Open
Abstract
Stereo-electroencephalography (SEEG) utilizes localized and penetrating depth electrodes to directly measure electrophysiological brain activity. The implanted electrodes generally provide a sparse sampling of multiple brain regions, including both cortical and subcortical structures, making the SEEG neural recordings a potential source for the brain–computer interface (BCI) purpose in recent years. For SEEG signals, data cleaning is an essential preprocessing step in removing excessive noises for further analysis. However, little is known about what kinds of effect that different data cleaning methods may exert on BCI decoding performance and, moreover, what are the reasons causing the differentiated effects. To address these questions, we adopted five different data cleaning methods, including common average reference, gray–white matter reference, electrode shaft reference, bipolar reference, and Laplacian reference, to process the SEEG data and evaluated the effect of these methods on improving BCI decoding performance. Additionally, we also comparatively investigated the changes of SEEG signals induced by these different methods from multiple-domain (e.g., spatial, spectral, and temporal domain). The results showed that data cleaning methods could improve the accuracy of gesture decoding, where the Laplacian reference produced the best performance. Further analysis revealed that the superiority of the data cleaning method with excellent performance might be attributed to the increased distinguishability in the low-frequency band. The findings of this work highlighted the importance of applying proper data clean methods for SEEG signals and proposed the application of Laplacian reference for SEEG-based BCI.
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Affiliation(s)
- Shengjie Liu
- State Key Laboratory of Mechanical Systems and Vibrations, Institute of Robotics, Shanghai Jiao Tong University, Shanghai, China
| | - Guangye Li
- State Key Laboratory of Mechanical Systems and Vibrations, Institute of Robotics, Shanghai Jiao Tong University, Shanghai, China
| | - Shize Jiang
- Department of Neurosurgery of Huashan Hospital, Fudan University, Shanghai, China
| | - Xiaolong Wu
- Department of Electronic and Electrical Engineering, University of Bath, Bath, United Kingdom
| | - Jie Hu
- Department of Neurosurgery of Huashan Hospital, Fudan University, Shanghai, China
| | - Dingguo Zhang
- Department of Electronic and Electrical Engineering, University of Bath, Bath, United Kingdom
| | - Liang Chen
- Department of Neurosurgery of Huashan Hospital, Fudan University, Shanghai, China
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Li G, Jiang S, Paraskevopoulou SE, Chai G, Wei Z, Liu S, Wang M, Xu Y, Fan Z, Wu Z, Chen L, Zhang D, Zhu X. Detection of human white matter activation and evaluation of its function in movement decoding using stereo-electroencephalography (SEEG). J Neural Eng 2021; 18. [PMID: 34284361 DOI: 10.1088/1741-2552/ac160e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 07/20/2021] [Indexed: 11/11/2022]
Abstract
Objective. White matter tissue takes up approximately 50% of the human brain volume and it is widely known as a messenger conducting information between areas of the central nervous system. However, the characteristics of white matter neural activity and whether white matter neural recordings can contribute to movement decoding are often ignored and still remain largely unknown. In this work, we make quantitative analyses to investigate these two important questions using invasive neural recordings.Approach. We recorded stereo-electroencephalography (SEEG) data from 32 human subjects during a visually-cued motor task, where SEEG recordings can tap into gray and white matter electrical activity simultaneously. Using the proximal tissue density method, we identified the location (i.e. gray or white matter) of each SEEG contact. Focusing on alpha oscillatory and high gamma activities, we compared the activation patterns between gray matter and white matter. Then, we evaluated the performance of such white matter activation in movement decoding.Main results. The results show that white matter also presents activation under the task, in a similar way with the gray matter but at a significantly lower amplitude. Additionally, this work also demonstrates that combing white matter neural activities together with that of gray matter significantly promotes the movement decoding accuracy than using gray matter signals only.Significance. Taking advantage of SEEG recordings from a large number of subjects, we reveal the response characteristics of white matter neural signals under the task and demonstrate its enhancing function in movement decoding. This study highlights the importance of taking white matter activities into consideration in further scientific research and translational applications.
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Affiliation(s)
- Guangye Li
- State Key Laboratory of Mechanical Systems and Vibrations, Institute of Robotics, Shanghai Jiao Tong University, Shanghai, People's Republic of China.,These authors contributed to this paper equally and should be considered as co-first authors
| | - Shize Jiang
- Department of Neurosurgery of Huashan Hospital, Fudan University, Shanghai, People's Republic of China.,These authors contributed to this paper equally and should be considered as co-first authors
| | - Sivylla E Paraskevopoulou
- National Center for Adaptive Neurotechnologies, Wadsworth Center, New York State Department of Health, Albany, NY, United States of America.,These authors contributed to this paper equally and should be considered as co-first authors
| | - Guohong Chai
- State Key Laboratory of Mechanical Systems and Vibrations, Institute of Robotics, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Zixuan Wei
- Department of Neurosurgery of Huashan Hospital, Fudan University, Shanghai, People's Republic of China
| | - Shengjie Liu
- State Key Laboratory of Mechanical Systems and Vibrations, Institute of Robotics, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Meng Wang
- State Key Laboratory of Mechanical Systems and Vibrations, Institute of Robotics, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Yang Xu
- State Key Laboratory of Mechanical Systems and Vibrations, Institute of Robotics, Shanghai Jiao Tong University, Shanghai, People's Republic of China
| | - Zhen Fan
- Department of Neurosurgery of Huashan Hospital, Fudan University, Shanghai, People's Republic of China
| | - Zehan Wu
- Department of Neurosurgery of Huashan Hospital, Fudan University, Shanghai, People's Republic of China
| | - Liang Chen
- Department of Neurosurgery of Huashan Hospital, Fudan University, Shanghai, People's Republic of China
| | - Dingguo Zhang
- Department of Electronic and Electrical Engineering, University of Bath, Bath, United Kingdom
| | - Xiangyang Zhu
- State Key Laboratory of Mechanical Systems and Vibrations, Institute of Robotics, Shanghai Jiao Tong University, Shanghai, People's Republic of China
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11
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Long-range phase synchronization of high-frequency oscillations in human cortex. Nat Commun 2020; 11:5363. [PMID: 33097714 PMCID: PMC7584610 DOI: 10.1038/s41467-020-18975-8] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 09/03/2020] [Indexed: 02/06/2023] Open
Abstract
Inter-areal synchronization of neuronal oscillations at frequencies below ~100 Hz is a pervasive feature of neuronal activity and is thought to regulate communication in neuronal circuits. In contrast, faster activities and oscillations have been considered to be largely local-circuit-level phenomena without large-scale synchronization between brain regions. We show, using human intracerebral recordings, that 100–400 Hz high-frequency oscillations (HFOs) may be synchronized between widely distributed brain regions. HFO synchronization expresses individual frequency peaks and exhibits reliable connectivity patterns that show stable community structuring. HFO synchronization is also characterized by a laminar profile opposite to that of lower frequencies. Importantly, HFO synchronization is both transiently enhanced and suppressed in separate frequency bands during a response-inhibition task. These findings show that HFO synchronization constitutes a functionally significant form of neuronal spike-timing relationships in brain activity and thus a mesoscopic indication of neuronal communication per se. High-frequency oscillations (HFOs) are common in mammalian brains and have been assumed to be strictly local. Using human intracerebral recordings, the authors find that HFOs can be phase synchronized across long distances between active cortical sites during resting and task states, which may reflect neuronal communication.
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12
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Eichenlaub JB, Biswal S, Peled N, Rivilis N, Golby AJ, Lee JW, Westover MB, Halgren E, Cash SS. Reactivation of Motor-Related Gamma Activity in Human NREM Sleep. Front Neurosci 2020; 14:449. [PMID: 32477056 PMCID: PMC7235414 DOI: 10.3389/fnins.2020.00449] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Accepted: 04/14/2020] [Indexed: 12/26/2022] Open
Abstract
Models of memory consolidation posit a central role for reactivation of brain activity patterns during sleep, especially in non-Rapid Eye Movement (NREM) sleep. While such "replay" of recent waking experiences has been well-demonstrated in rodents, electrophysiological evidence of reactivation in human sleep is still largely lacking. In this intracranial study in patients with epilepsy (N = 9) we explored the spontaneous electroencephalographic reactivation during sleep of spatial patterns of brain activity evoked by motor learning. We first extracted the gamma-band (60-140 Hz) patterns underlying finger movements during a tapping task and underlying no-movement during a short rest period just prior to the task, and trained a binary classifier to discriminate between motor movements vs. rest. We then used the trained model on NREM sleep data immediately after the task and on NREM sleep during a control sleep period preceding the task. Compared with the control sleep period, we found, at the subject level, an increase in the detection rate of motor-related patterns during sleep following the task, but without association with performance changes. These data provide electrophysiological support for the reoccurrence in NREM sleep of the neural activity related to previous waking experience, i.e. that a basic tenet of the reactivation theory does occur in human sleep.
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Affiliation(s)
- Jean-Baptiste Eichenlaub
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Siddharth Biswal
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Noam Peled
- Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Nicole Rivilis
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Alexandra J. Golby
- Department of Neurosurgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, United States
| | - Jong Woo Lee
- Department of Neurology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, United States
| | - M. Brandon Westover
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
| | - Eric Halgren
- Departments of Radiology and Neuroscience, Kavli Institute for Brain and Mind, University of California, San Diego, San Diego, CA, United States
| | - Sydney S. Cash
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
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13
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Li M, Xu Y, Luo X, Zeng J, Han Z. Linguistic experience acquisition for novel stimuli selectively activates the neural network of the visual word form area. Neuroimage 2020; 215:116838. [PMID: 32298792 DOI: 10.1016/j.neuroimage.2020.116838] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/24/2020] [Accepted: 04/06/2020] [Indexed: 10/24/2022] Open
Abstract
The human ventral visual cortex is functionally organized into different domains that sensitively respond to different categories, such as words and objects. There is heated debate over what principle constrains the locations of those domains. Taking the visual word form area (VWFA) as an example, we tested whether the word preference in this area originates from the bottom-up processes related to word shape (the shape hypothesis) or top-down connectivity of higher-order language regions (the connectivity hypothesis). We trained subjects to associate identical, meaningless, non-word-like figures with high-level features of either words or objects. We found that the word-feature learning for the figures elicited the neural activation change in the VWFA, and learning performance effectively predicted the activation strength of this area after learning. Word-learning effects were also observed in other language areas (i.e., the left posterior superior temporal gyrus, postcentral gyrus, and supplementary motor area), with increased functional connectivity between the VWFA and the language regions. In contrast, object-feature learning was not associated with obvious activation changes in the language regions. These results indicate that high-level language features of stimuli can modulate the activation of the VWFA, providing supportive evidence for the connectivity hypothesis of words processing in the ventral occipitotemporal cortex.
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Affiliation(s)
- Mingyang Li
- State Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing, 100875, China
| | - Yangwen Xu
- Center for Mind/Brain Sciences (CIMeC), University of Trento, Trento, 38123, Italy; International School for Advanced Studies (SISSA), Trieste, 34136, Italy
| | - Xiangqi Luo
- State Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing, 100875, China
| | - Jiahong Zeng
- State Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing, 100875, China
| | - Zaizhu Han
- State Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing, 100875, China.
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14
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Perrone-Bertolotti M, El Bouzaïdi Tiali S, Vidal JR, Petton M, Croize AC, Deman P, Rheims S, Minotti L, Bhattacharjee M, Baciu M, Kahane P, Lachaux JP. A real-time marker of object-based attention in the human brain. A possible component of a "gate-keeping mechanism" performing late attentional selection in the Ventro-Lateral Prefrontal Cortex. Neuroimage 2020; 210:116574. [PMID: 31981780 DOI: 10.1016/j.neuroimage.2020.116574] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 12/20/2019] [Accepted: 01/18/2020] [Indexed: 10/25/2022] Open
Abstract
The decision to process an incoming stimulus attentively - and to trigger a follow-up cascade of high-level processes - is strategic for the human brain as it becomes transiently unavailable to subsequent stimulus processing. In this study, we set to identify brain networks that carry out such evaluations. We therefore assessed the time-course of neural responses with intracerebral EEG in human patients during an attentional reading task, contrasting to-be-attended vs. to-be-ignored items. We measured High-Frequency Activity [50-150 Hz] as a proxy of population-level spiking activity and we identified a crucial component of a Gate-Keeping Mechanism bilateral in the mid-Ventro-Lateral Prefrontal Cortex (VLPFC), at the interplay of the Ventral and Dorsal Attention Networks, that selectively reacts before domain specialized cortical regions that engage in full stimulus analysis according to task demands.
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Affiliation(s)
- M Perrone-Bertolotti
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LPNC, 38000, Grenoble, France; Institut Universitaire de France (IUF), France.
| | - S El Bouzaïdi Tiali
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LPNC, 38000, Grenoble, France
| | - J R Vidal
- UMRS 449, Université Catholique de Lyon, Ecole Pratique des Hautes Etudes, 69002, Lyon, France
| | - M Petton
- INSERM, U1028, CNRS, UMR5292, Lyon Neuroscience Research Center, Brain Dynamics and Cognition Team, DYCOG, Lyon, F-69000, France; University of Lyon, Lyon, France
| | - A C Croize
- INSERM, U836, F-38000, Grenoble, France; Univ. Grenoble Alpes, Institut des Neurosciences, GIN, 38000, Grenoble, France
| | - P Deman
- INSERM, U836, F-38000, Grenoble, France; Univ. Grenoble Alpes, Institut des Neurosciences, GIN, 38000, Grenoble, France
| | - S Rheims
- University of Lyon, Lyon, France; INSERM U1028, CNRS UMR 5292, Lyon's Neuroscience Research Center, Translational and Integrative Research in Epilepsy, TIGER, Lyon, F-69000, France; Department of Functional Neurology and Epileptology, Hospices Civils de Lyon, Lyon, France
| | - L Minotti
- Univ. Grenoble Alpes, Institut des Neurosciences, GIN, 38000, Grenoble, France; CHU Grenoble Alpes, Pôle Neurologie Psychiatrie, 38000, Grenoble, France; Inserm, U1216, F-38000, Grenoble, France
| | - M Bhattacharjee
- INSERM, U836, F-38000, Grenoble, France; Univ. Grenoble Alpes, Institut des Neurosciences, GIN, 38000, Grenoble, France
| | - M Baciu
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, LPNC, 38000, Grenoble, France; Institut Universitaire de France (IUF), France
| | - P Kahane
- Univ. Grenoble Alpes, Institut des Neurosciences, GIN, 38000, Grenoble, France; CHU Grenoble Alpes, Pôle Neurologie Psychiatrie, 38000, Grenoble, France; Inserm, U1216, F-38000, Grenoble, France
| | - J P Lachaux
- INSERM, U1028, CNRS, UMR5292, Lyon Neuroscience Research Center, Brain Dynamics and Cognition Team, DYCOG, Lyon, F-69000, France; University of Lyon, Lyon, France
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15
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Madhavan R, Bansal AK, Madsen JR, Golby AJ, Tierney TS, Eskandar EN, Anderson WS, Kreiman G. Neural Interactions Underlying Visuomotor Associations in the Human Brain. Cereb Cortex 2019; 29:4551-4567. [PMID: 30590542 DOI: 10.1093/cercor/bhy333] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 10/30/2018] [Accepted: 12/03/2018] [Indexed: 11/13/2022] Open
Abstract
Rapid and flexible learning during behavioral choices is critical to our daily endeavors and constitutes a hallmark of dynamic reasoning. An important paradigm to examine flexible behavior involves learning new arbitrary associations mapping visual inputs to motor outputs. We conjectured that visuomotor rules are instantiated by translating visual signals into actions through dynamic interactions between visual, frontal and motor cortex. We evaluated the neural representation of such visuomotor rules by performing intracranial field potential recordings in epilepsy subjects during a rule-learning delayed match-to-behavior task. Learning new visuomotor mappings led to the emergence of specific responses associating visual signals with motor outputs in 3 anatomical clusters in frontal, anteroventral temporal and posterior parietal cortex. After learning, mapping selective signals during the delay period showed interactions with visual and motor signals. These observations provide initial steps towards elucidating the dynamic circuits underlying flexible behavior and how communication between subregions of frontal, temporal, and parietal cortex leads to rapid learning of task-relevant choices.
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Affiliation(s)
- Radhika Madhavan
- Departments of Ophthalmology and Neurosurgery, Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA, US
| | - Arjun K Bansal
- Departments of Ophthalmology and Neurosurgery, Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA, US.,Current affiliation: Nervana Systems, Inc., 12220 Scripps Summit Dr, San Diego, CA, US
| | - Joseph R Madsen
- Departments of Ophthalmology and Neurosurgery, Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA, US
| | - Alexandra J Golby
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA, US
| | - Travis S Tierney
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA, US
| | - Emad N Eskandar
- Department of Neurosurgery, Massachusetts General Hospital, 55 Fruit St, Boston, MA, US
| | - William S Anderson
- Department of Neurosurgery, Johns Hopkins Medical School, 733 N Broadway, Baltimore, MD, US
| | - Gabriel Kreiman
- Departments of Ophthalmology and Neurosurgery, Children's Hospital, Harvard Medical School, 300 Longwood Avenue, Boston, MA, US.,Center for Brain Science, Harvard University, 52 Oxford St, Cambridge, MA, US
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16
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Gabriel PG, Chen KJ, Alasfour A, Pailla T, Doyle WK, Devinsky O, Friedman D, Dugan P, Melloni L, Thesen T, Gonda D, Sattar S, Wang SG, Gilja V. Neural correlates of unstructured motor behaviors. J Neural Eng 2019; 16:066026. [DOI: 10.1088/1741-2552/ab355c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Himmelstoss NA, Schuster S, Hutzler F, Moran R, Hawelka S. Co-registration of eye movements and neuroimaging for studying contextual predictions in natural reading. LANGUAGE, COGNITION AND NEUROSCIENCE 2019; 35:595-612. [PMID: 32656295 PMCID: PMC7324136 DOI: 10.1080/23273798.2019.1616102] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 04/26/2019] [Indexed: 06/11/2023]
Abstract
Sixteen years ago, Sereno and Rayner (2003. Measuring word recognition in reading: eye movements and event-related potentials. Trends in Cognitive Sciences, 7(11), 489-493) illustrated how "by means of review and comparison" eye movement (EM) and event-related potential (ERP) studies may advance our understanding of visual word recognition. Attempts to simultaneously record EMs and ERPs soon followed. Recently, this co-registration approach has also been transferred to fMRI and oscillatory EEG. With experimental settings close to natural reading, co-registration enables us to directly integrate insights from EM and neuroimaging studies. This should extend current experimental paradigms by moving the field towards studying sentence-level processing including effects of context and parafoveal preview. This article will introduce the basic principles and applications of co-registration and selectively review how this approach may shed light on one of the most controversially discussed issues in reading research, contextual predictions in online language processing.
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Affiliation(s)
| | - Sarah Schuster
- Centre for Cognitive Neuroscience, University of Salzburg, Salzburg, Austria
| | - Florian Hutzler
- Centre for Cognitive Neuroscience, University of Salzburg, Salzburg, Austria
| | - Rosalyn Moran
- Department of Neuroimaging, Institute of Psychiatry, Psychology & Neuroscience, King’s College London, London, UK
| | - Stefan Hawelka
- Centre for Cognitive Neuroscience, University of Salzburg, Salzburg, Austria
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18
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Hesse E, Mikulan E, Sitt JD, Garcia MDC, Silva W, Ciraolo C, Vaucheret E, Raimondo F, Baglivo F, Adolfi F, Herrera E, Bekinschtein TA, Petroni A, Lew S, Sedeno L, Garcia AM, Ibanez A. Consistent Gradient of Performance and Decoding of Stimulus Type and Valence From Local and Network Activity. IEEE Trans Neural Syst Rehabil Eng 2019; 27:619-629. [PMID: 30869625 DOI: 10.1109/tnsre.2019.2903921] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The individual differences approach focuses on the variation of behavioral and neural signatures across subjects. In this context, we searched for intracranial neural markers of performance in three individuals with distinct behavioral patterns (efficient, borderline, and inefficient) in a dual-valence task assessing facial and lexical emotion recognition. First, we performed a preliminary study to replicate well-established evoked responses in relevant brain regions. Then, we examined time series data and network connectivity, combined with multivariate pattern analyses and machine learning, to explore electrophysiological differences in resting-state versus task-related activity across subjects. Next, using the same methodological approach, we assessed the neural decoding of performance for different dimensions of the task. The classification of time series data mirrored the behavioral gradient across subjects for stimulus type but not for valence. However, network-based measures reflected the subjects' hierarchical profiles for both stimulus types and valence. Therefore, this measure serves as a sensitive marker for capturing distributed processes such as emotional valence discrimination, which relies on an extended set of regions. Network measures combined with classification methods may offer useful insights to study single subjects and understand inter-individual performance variability. Promisingly, this approach could eventually be extrapolated to other neuroscientific techniques.
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19
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Human Verbal Memory Encoding Is Hierarchically Distributed in a Continuous Processing Stream. eNeuro 2019; 6:eN-NWR-0214-18. [PMID: 30847390 PMCID: PMC6402539 DOI: 10.1523/eneuro.0214-18.2018] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 11/28/2018] [Accepted: 12/10/2018] [Indexed: 12/16/2022] Open
Abstract
Processing of memory is supported by coordinated activity in a network of sensory, association, and motor brain regions. It remains a major challenge to determine where memory is encoded for later retrieval. Here, we used direct intracranial brain recordings from epilepsy patients performing free recall tasks to determine the temporal pattern and anatomical distribution of verbal memory encoding across the entire human cortex. High γ frequency activity (65–115 Hz) showed consistent power responses during encoding of subsequently recalled and forgotten words on a subset of electrodes localized in 16 distinct cortical areas activated in the tasks. More of the high γ power during word encoding, and less power before and after the word presentation, was characteristic of successful recall and observed across multiple brain regions. Latencies of the induced power changes and this subsequent memory effect (SME) between the recalled and forgotten words followed an anatomical sequence from visual to prefrontal cortical areas. Finally, the magnitude of the memory effect was unexpectedly found to be the largest in selected brain regions both at the top and at the bottom of the processing stream. These included the language processing areas of the prefrontal cortex and the early visual areas at the junction of the occipital and temporal lobes. Our results provide evidence for distributed encoding of verbal memory organized along a hierarchical posterior-to-anterior processing stream.
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20
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Optimal referencing for stereo-electroencephalographic (SEEG) recordings. Neuroimage 2018; 183:327-335. [PMID: 30121338 DOI: 10.1016/j.neuroimage.2018.08.020] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 07/24/2018] [Accepted: 08/10/2018] [Indexed: 12/12/2022] Open
Abstract
Stereo-electroencephalography (SEEG) is an intracranial recording technique in which depth electrodes are inserted in the brain as part of presurgical assessments for invasive brain surgery. SEEG recordings can tap into neural signals across the entire brain and thereby sample both cortical and subcortical sites. However, even though signal referencing is important for proper assessment of SEEG signals, no previous study has comprehensively evaluated the optimal referencing method for SEEG. In our study, we recorded SEEG data from 15 human subjects during a motor task, referencing them against the average of two white matter contacts (monopolar reference). We then subjected these signals to 5 different re-referencing approaches: common average reference (CAR), gray-white matter reference (GWR), electrode shaft reference (ESR), bipolar reference, and Laplacian reference. The results from three different signal quality metrics suggest the use of the Laplacian re-reference for study of local population-level activity and low-frequency oscillatory activity.
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21
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Large-scale functional networks connect differently for processing words and symbol strings. PLoS One 2018; 13:e0196773. [PMID: 29718993 PMCID: PMC5931649 DOI: 10.1371/journal.pone.0196773] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 04/19/2018] [Indexed: 11/19/2022] Open
Abstract
Reconfigurations of synchronized large-scale networks are thought to be central neural mechanisms that support cognition and behavior in the human brain. Magnetoencephalography (MEG) recordings together with recent advances in network analysis now allow for sub-second snapshots of such networks. In the present study, we compared frequency-resolved functional connectivity patterns underlying reading of single words and visual recognition of symbol strings. Word reading emphasized coherence in a left-lateralized network with nodes in classical perisylvian language regions, whereas symbol processing recruited a bilateral network, including connections between frontal and parietal regions previously associated with spatial attention and visual working memory. Our results illustrate the flexible nature of functional networks, whereby processing of different form categories, written words vs. symbol strings, leads to the formation of large-scale functional networks that operate at distinct oscillatory frequencies and incorporate task-relevant regions. These results suggest that category-specific processing should be viewed not so much as a local process but as a distributed neural process implemented in signature networks. For words, increased coherence was detected particularly in the alpha (8-13 Hz) and high gamma (60-90 Hz) frequency bands, whereas increased coherence for symbol strings was observed in the high beta (21-29 Hz) and low gamma (30-45 Hz) frequency range. These findings attest to the role of coherence in specific frequency bands as a general mechanism for integrating stimulus-dependent information across brain regions.
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22
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Khan S, Hashmi JA, Mamashli F, Michmizos K, Kitzbichler MG, Bharadwaj H, Bekhti Y, Ganesan S, Garel KLA, Whitfield-Gabrieli S, Gollub RL, Kong J, Vaina LM, Rana KD, Stufflebeam SM, Hämäläinen MS, Kenet T. Maturation trajectories of cortical resting-state networks depend on the mediating frequency band. Neuroimage 2018; 174:57-68. [PMID: 29462724 DOI: 10.1016/j.neuroimage.2018.02.018] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 02/07/2018] [Accepted: 02/10/2018] [Indexed: 12/11/2022] Open
Abstract
The functional significance of resting state networks and their abnormal manifestations in psychiatric disorders are firmly established, as is the importance of the cortical rhythms in mediating these networks. Resting state networks are known to undergo substantial reorganization from childhood to adulthood, but whether distinct cortical rhythms, which are generated by separable neural mechanisms and are often manifested abnormally in psychiatric conditions, mediate maturation differentially, remains unknown. Using magnetoencephalography (MEG) to map frequency band specific maturation of resting state networks from age 7 to 29 in 162 participants (31 independent), we found significant changes with age in networks mediated by the beta (13-30 Hz) and gamma (31-80 Hz) bands. More specifically, gamma band mediated networks followed an expected asymptotic trajectory, but beta band mediated networks followed a linear trajectory. Network integration increased with age in gamma band mediated networks, while local segregation increased with age in beta band mediated networks. Spatially, the hubs that changed in importance with age in the beta band mediated networks had relatively little overlap with those that showed the greatest changes in the gamma band mediated networks. These findings are relevant for our understanding of the neural mechanisms of cortical maturation, in both typical and atypical development.
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Affiliation(s)
- Sheraz Khan
- Department of Neurology, MGH, Harvard Medical School, Boston, USA; Department of Radiology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA; McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, USA.
| | - Javeria A Hashmi
- Department of Neurology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | - Fahimeh Mamashli
- Department of Neurology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | - Konstantinos Michmizos
- Department of Neurology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | - Manfred G Kitzbichler
- Department of Neurology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | - Hari Bharadwaj
- Department of Neurology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | - Yousra Bekhti
- Department of Neurology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | - Santosh Ganesan
- Department of Neurology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | - Keri-Lee A Garel
- Department of Neurology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | | | - Randy L Gollub
- Department of Psychiatry MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | - Jian Kong
- Department of Psychiatry MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | - Lucia M Vaina
- Department of Neurology, MGH, Harvard Medical School, Boston, USA; Department of Biomedical Engineering, Boston University, Boston, USA
| | - Kunjan D Rana
- Department of Biomedical Engineering, Boston University, Boston, USA
| | - Steven M Stufflebeam
- Department of Radiology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | - Matti S Hämäläinen
- Department of Radiology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
| | - Tal Kenet
- Department of Neurology, MGH, Harvard Medical School, Boston, USA; Athinoula A. Martinos Center for Biomedical Imaging, MGH/HST, Charlestown, USA
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23
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Kadipasaoglu CM, Conner CR, Baboyan VG, Rollo M, Pieters TA, Tandon N. Network dynamics of human face perception. PLoS One 2017; 12:e0188834. [PMID: 29190811 PMCID: PMC5708727 DOI: 10.1371/journal.pone.0188834] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Accepted: 11/14/2017] [Indexed: 11/19/2022] Open
Abstract
Prevailing theories suggests that cortical regions responsible for face perception operate in a serial, feed-forward fashion. Here, we utilize invasive human electrophysiology to evaluate serial models of face-processing via measurements of cortical activation, functional connectivity, and cortico-cortical evoked potentials. We find that task-dependent changes in functional connectivity between face-selective regions in the inferior occipital (f-IOG) and fusiform gyrus (f-FG) are bidirectional, not feed-forward, and emerge following feed-forward input from early visual cortex (EVC) to both of these regions. Cortico-cortical evoked potentials similarly reveal independent signal propagations between EVC and both f-IOG and f-FG. These findings are incompatible with serial models, and support a parallel, distributed network underpinning face perception in humans.
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Affiliation(s)
- Cihan Mehmet Kadipasaoglu
- Vivian Smith Department of Neurosurgery, Univ. of Texas Medical School at Houston, Houston, Texas, United States of America
| | - Christopher Richard Conner
- Vivian Smith Department of Neurosurgery, Univ. of Texas Medical School at Houston, Houston, Texas, United States of America
| | - Vatche George Baboyan
- Vivian Smith Department of Neurosurgery, Univ. of Texas Medical School at Houston, Houston, Texas, United States of America
| | - Matthew Rollo
- Vivian Smith Department of Neurosurgery, Univ. of Texas Medical School at Houston, Houston, Texas, United States of America
| | - Thomas Allyn Pieters
- Vivian Smith Department of Neurosurgery, Univ. of Texas Medical School at Houston, Houston, Texas, United States of America
| | - Nitin Tandon
- Vivian Smith Department of Neurosurgery, Univ. of Texas Medical School at Houston, Houston, Texas, United States of America
- Memorial Hermann Hospital, Texas Medical Center, Houston, Texas, United States of America
- * E-mail:
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24
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Bocquelet F, Hueber T, Girin L, Chabardès S, Yvert B. Key considerations in designing a speech brain-computer interface. ACTA ACUST UNITED AC 2017; 110:392-401. [PMID: 28756027 DOI: 10.1016/j.jphysparis.2017.07.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 06/21/2017] [Accepted: 07/19/2017] [Indexed: 01/08/2023]
Abstract
Restoring communication in case of aphasia is a key challenge for neurotechnologies. To this end, brain-computer strategies can be envisioned to allow artificial speech synthesis from the continuous decoding of neural signals underlying speech imagination. Such speech brain-computer interfaces do not exist yet and their design should consider three key choices that need to be made: the choice of appropriate brain regions to record neural activity from, the choice of an appropriate recording technique, and the choice of a neural decoding scheme in association with an appropriate speech synthesis method. These key considerations are discussed here in light of (1) the current understanding of the functional neuroanatomy of cortical areas underlying overt and covert speech production, (2) the available literature making use of a variety of brain recording techniques to better characterize and address the challenge of decoding cortical speech signals, and (3) the different speech synthesis approaches that can be considered depending on the level of speech representation (phonetic, acoustic or articulatory) envisioned to be decoded at the core of a speech BCI paradigm.
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Affiliation(s)
- Florent Bocquelet
- INSERM, BrainTech Laboratory U1205, F-38000 Grenoble, France; Univ. Grenoble Alpes, BrainTech Laboratory U1205, F-38000 Grenoble, France
| | - Thomas Hueber
- Univ. Grenoble Alpes, CNRS, Grenoble INP, GIPSA-lab, 38000 Grenoble, France
| | - Laurent Girin
- Univ. Grenoble Alpes, CNRS, Grenoble INP, GIPSA-lab, 38000 Grenoble, France
| | | | - Blaise Yvert
- INSERM, BrainTech Laboratory U1205, F-38000 Grenoble, France; Univ. Grenoble Alpes, BrainTech Laboratory U1205, F-38000 Grenoble, France.
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25
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Perrone-Bertolotti M, Kauffmann L, Pichat C, Vidal JR, Baciu M. Effective Connectivity between Ventral Occipito-Temporal and Ventral Inferior Frontal Cortex during Lexico-Semantic Processing. A Dynamic Causal Modeling Study. Front Hum Neurosci 2017; 11:325. [PMID: 28690506 PMCID: PMC5480016 DOI: 10.3389/fnhum.2017.00325] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Accepted: 06/06/2017] [Indexed: 11/13/2022] Open
Abstract
It has been suggested that dorsal and ventral pathways support distinct aspects of language processing. Yet, the full extent of their involvement and their inter-regional connectivity in visual word recognition is still unknown. Studies suggest that they might reflect the dual-route model of reading, with the dorsal pathway more involved in grapho-phonological conversion during phonological tasks, and the ventral pathway performing lexico-semantic access during semantic tasks. Furthermore, this subdivision is also suggested at the level of the inferior frontal cortex, involving ventral and dorsal parts for lexico-semantic and phonological processing, respectively. In the present study, we assessed inter-regional brain connectivity and task-induced modulations of brain activity during a phoneme detection and semantic categorization tasks, using fMRI in healthy subject. We used a dynamic causal modeling approach to assess inter-regional connectivity and task demand modulation within the dorsal and ventral pathways, including the following network components: the ventral occipito-temporal cortex (vOTC; dorsal and ventral), the superior temporal gyrus (STG; dorsal), the dorsal inferior frontal gyrus (dIFG; dorsal), and the ventral IFG (vIFG; ventral). We report three distinct inter-regional interactions supporting orthographic information transfer from vOTC to other language regions (vOTC -> STG, vOTC -> vIFG and vOTC -> dIFG) regardless of task demands. Moreover, we found that (a) during semantic processing (direct ventral pathway) the vOTC -> vIFG connection strength specifically increased and (b) a lack of modulation of the vOTC -> dIFG connection strength by the task that could suggest a more general involvement of the dorsal pathway during visual word recognition. Results are discussed in terms of anatomo-functional connectivity of visual word recognition network.
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Affiliation(s)
| | - Louise Kauffmann
- Department of Psychology, Université Grenoble Alpes, CNRS, LPNC UMR 51055105Grenoble, France.,Neural Mechanisms of Human Communication Research group, Max Planck Institute for Human Cognitive and Brain SciencesLeipzig, Germany
| | - Cédric Pichat
- Department of Psychology, Université Grenoble Alpes, CNRS, LPNC UMR 51055105Grenoble, France
| | - Juan R Vidal
- Department of Psychology, Université Grenoble Alpes, CNRS, LPNC UMR 51055105Grenoble, France
| | - Monica Baciu
- Department of Psychology, Université Grenoble Alpes, CNRS, LPNC UMR 51055105Grenoble, France
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26
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Vallat R, Lajnef T, Eichenlaub JB, Berthomier C, Jerbi K, Morlet D, Ruby PM. Increased Evoked Potentials to Arousing Auditory Stimuli during Sleep: Implication for the Understanding of Dream Recall. Front Hum Neurosci 2017; 11:132. [PMID: 28377708 PMCID: PMC5360011 DOI: 10.3389/fnhum.2017.00132] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 03/07/2017] [Indexed: 11/13/2022] Open
Abstract
High dream recallers (HR) show a larger brain reactivity to auditory stimuli during wakefulness and sleep as compared to low dream recallers (LR) and also more intra-sleep wakefulness (ISW), but no other modification of the sleep macrostructure. To further understand the possible causal link between brain responses, ISW and dream recall, we investigated the sleep microstructure of HR and LR, and tested whether the amplitude of auditory evoked potentials (AEPs) was predictive of arousing reactions during sleep. Participants (18 HR, 18 LR) were presented with sounds during a whole night of sleep in the lab and polysomnographic data were recorded. Sleep microstructure (arousals, rapid eye movements (REMs), muscle twitches (MTs), spindles, KCs) was assessed using visual, semi-automatic and automatic validated methods. AEPs to arousing (awakenings or arousals) and non-arousing stimuli were subsequently computed. No between-group difference in the microstructure of sleep was found. In N2 sleep, auditory arousing stimuli elicited a larger parieto-occipital positivity and an increased late frontal negativity as compared to non-arousing stimuli. As compared to LR, HR showed more arousing stimuli and more long awakenings, regardless of the sleep stage but did not show more numerous or longer arousals. These results suggest that the amplitude of the brain response to stimuli during sleep determine subsequent awakening and that awakening duration (and not arousal) is the critical parameter for dream recall. Notably, our results led us to propose that the minimum necessary duration of an awakening during sleep for a successful encoding of dreams into long-term memory is approximately 2 min.
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Affiliation(s)
- Raphael Vallat
- Brain Dynamics and Cognition Team-Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR 5292, Centre Hospitalier Le Vinatier (Bat. 452)Bron, France; Lyon 1 UniversityLyon, France
| | - Tarek Lajnef
- LETI Lab, Sfax National Engineering School, University of SfaxSfax, Tunisia; Department of Psychology, Université de MontréalMontréal, QC, Canada
| | | | | | - Karim Jerbi
- Brain Dynamics and Cognition Team-Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR 5292, Centre Hospitalier Le Vinatier (Bat. 452)Bron, France; Department of Psychology, Université de MontréalMontréal, QC, Canada
| | - Dominique Morlet
- Brain Dynamics and Cognition Team-Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR 5292, Centre Hospitalier Le Vinatier (Bat. 452)Bron, France; Lyon 1 UniversityLyon, France
| | - Perrine M Ruby
- Brain Dynamics and Cognition Team-Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR 5292, Centre Hospitalier Le Vinatier (Bat. 452)Bron, France; Lyon 1 UniversityLyon, France
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27
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From intentions to actions: Neural oscillations encode motor processes through phase, amplitude and phase-amplitude coupling. Neuroimage 2016; 147:473-487. [PMID: 27915117 DOI: 10.1016/j.neuroimage.2016.11.042] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 09/19/2016] [Accepted: 11/16/2016] [Indexed: 12/24/2022] Open
Abstract
Goal-directed motor behavior is associated with changes in patterns of rhythmic neuronal activity across widely distributed brain areas. In particular, movement initiation and execution are mediated by patterns of synchronization and desynchronization that occur concurrently across distinct frequency bands and across multiple motor cortical areas. To date, motor-related local oscillatory modulations have been predominantly examined by quantifying increases or suppressions in spectral power. However, beyond signal power, spectral properties such as phase and phase-amplitude coupling (PAC) have also been shown to carry information with regards to the oscillatory dynamics underlying motor processes. Yet, the distinct functional roles of phase, amplitude and PAC across the planning and execution of goal-directed motor behavior remain largely elusive. Here, we address this question with unprecedented resolution thanks to multi-site intracerebral EEG recordings in human subjects while they performed a delayed motor task. To compare the roles of phase, amplitude and PAC, we monitored intracranial brain signals from 748 sites across six medically intractable epilepsy patients at movement execution, and during the delay period where motor intention is present but execution is withheld. In particular, we used a machine-learning framework to identify the key contributions of various neuronal responses. We found a high degree of overlap between brain network patterns observed during planning and those present during execution. Prominent amplitude increases in the delta (2-4Hz) and high gamma (60-200Hz) bands were observed during both planning and execution. In contrast, motor alpha (8-13Hz) and beta (13-30Hz) power were suppressed during execution, but enhanced during the delay period. Interestingly, single-trial classification revealed that low-frequency phase information, rather than spectral power change, was the most discriminant feature in dissociating action from intention. Additionally, despite providing weaker decoding, PAC features led to statistically significant classification of motor states, particularly in anterior cingulate cortex and premotor brain areas. These results advance our understanding of the distinct and partly overlapping involvement of phase, amplitude and the coupling between them, in the neuronal mechanisms underlying motor intentions and executions.
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28
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Saignavongs M, Ciumas C, Petton M, Bouet R, Boulogne S, Rheims S, Carmichael DW, Lachaux JP, Ryvlin P. Neural Activity Elicited by a Cognitive Task can be Detected in Single-Trials with Simultaneous Intracerebral EEG-fMRI Recordings. Int J Neural Syst 2016; 27:1750001. [PMID: 27718767 DOI: 10.1142/s0129065717500010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Recent studies have shown that it is feasible to record simultaneously intracerebral EEG (icEEG) and functional magnetic resonance imaging (fMRI) in patients with epilepsy. While it has mainly been used to explore the hemodynamic changes associated with epileptic spikes, this approach could also provide new insight into human cognition. However, the first step is to ensure that cognitive EEG components, that have lower amplitudes than epileptic spikes, can be appropriately detected under fMRI. We compared the high frequency activities (HFA, 50-150[Formula: see text]Hz) elicited by a reading task in icEEG-only and subsequent icEEG-fMRI in the same patients ([Formula: see text]), implanted with depth electrodes. Comparable responses were obtained, with 71% of the recording sites that responded during the icEEG-only session also responding during the icEEG-fMRI session. For all the remaining sites, nearby clusters (distant of 7[Formula: see text]mm or less) also demonstrated significant HFA increase during the icEEG-fMRI session. Significant HFA increases were also observable at the single-trial level in icEEG-fMRI recordings. Our results show that low-amplitude icEEG signal components such as cognitive-induced HFAs can be reliably recorded with simultaneous fMRI. This paves the way for the use of icEEG-fMRI to address various fundamental and clinical issues, notably the identification of the neural correlates of the BOLD signal.
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Affiliation(s)
- Mani Saignavongs
- * Lyon Neuroscience Research Center, INSERM U1028 / CNRS UMR 5292 Lyon, France.,† Epilepsy Institute IDEE, Lyon, France
| | - Carolina Ciumas
- * Lyon Neuroscience Research Center, INSERM U1028 / CNRS UMR 5292 Lyon, France.,† Epilepsy Institute IDEE, Lyon, France.,‡ Department of Clinical Neurosciences, Centre Hospitalo-Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland
| | - Mathilde Petton
- * Lyon Neuroscience Research Center, INSERM U1028 / CNRS UMR 5292 Lyon, France
| | - Romain Bouet
- * Lyon Neuroscience Research Center, INSERM U1028 / CNRS UMR 5292 Lyon, France
| | - Sébastien Boulogne
- * Lyon Neuroscience Research Center, INSERM U1028 / CNRS UMR 5292 Lyon, France.,† Epilepsy Institute IDEE, Lyon, France.,§ Department of Functional Neurology and Epileptology, Hospices Civils de Lyon, France
| | - Sylvain Rheims
- * Lyon Neuroscience Research Center, INSERM U1028 / CNRS UMR 5292 Lyon, France.,† Epilepsy Institute IDEE, Lyon, France.,§ Department of Functional Neurology and Epileptology, Hospices Civils de Lyon, France
| | - David W Carmichael
- ¶ Developmental Imaging and Biophysics, UCL Institute of Child Health, University College London, UK
| | | | - Philippe Ryvlin
- † Epilepsy Institute IDEE, Lyon, France.,‡ Department of Clinical Neurosciences, Centre Hospitalo-Universitaire Vaudois and University of Lausanne, Lausanne, Switzerland
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29
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Soto JLP, Lachaux JP, Baillet S, Jerbi K. A multivariate method for estimating cross-frequency neuronal interactions and correcting linear mixing in MEG data, using canonical correlations. J Neurosci Methods 2016; 271:169-81. [PMID: 27468679 DOI: 10.1016/j.jneumeth.2016.07.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 07/22/2016] [Accepted: 07/24/2016] [Indexed: 11/26/2022]
Abstract
BACKGROUND Cross-frequency interactions between distinct brain areas have been observed in connection with a variety of cognitive tasks. With electro- and magnetoencephalography (EEG/MEG) data, typical connectivity measures between two brain regions analyze a single quantity from each region within a specific frequency band; given the wideband nature of EEG/MEG signals, many statistical tests may be required to identify true coupling. Furthermore, because of the poor spatial resolution of activity reconstructed from EEG/MEG, some interactions may actually be due to the linear mixing of brain sources. NEW METHOD In the present work, a method for the detection of cross-frequency functional connectivity in MEG data using canonical correlation analysis (CCA) is described. We demonstrate that CCA identifies correlated signals and also the frequencies that cause the correlation. We also implement a procedure to deal with linear mixing based on symmetry properties of cross-covariance matrices. RESULTS Our tests with both simulated and real MEG data demonstrate that CCA is able to detect interacting locations and the frequencies that cause them, while accurately discarding spurious coupling. COMPARISON WITH EXISTING METHODS Recent techniques look at time delays in the activity between two locations to discard spurious interactions, while we propose a linear mixing model and demonstrate its relationship with symmetry aspects of cross-covariance matrices. CONCLUSIONS Our tests indicate the benefits of the CCA approach in connectivity studies, as it allows the simultaneous evaluation of several possible combinations of cross-frequency interactions in a single statistical test.
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Affiliation(s)
- Juan L P Soto
- Department of Telecommunications and Control Engineering, University of São Paulo, São Paulo, Brazil.
| | - Jean-Philippe Lachaux
- Brain Dynamics and Cognition Team, Lyon Neuroscience Research Center, INSERM U1028 - CNRS UMR5292 - Lyon University, Lyon, France
| | - Sylvain Baillet
- McConnell Brain Imaging Centre, Montreal Neurological Institute, McGill University, Montreal, Canada
| | - Karim Jerbi
- Department of Psychology, University of Montreal, Montreal, Canada
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30
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Abstract
UNLABELLED Opinions are divided on whether word reading processes occur in a hierarchical, feedforward fashion or within an interactive framework. To critically evaluate these competing theories, we recorded electrocorticographic (ECoG) data from 15 human patients with intractable epilepsy during a word completion task and evaluated brain network dynamics across individuals. We used a novel technique of analyzing multihuman ECoG recordings to identify cortical regions most relevant to processing lexical information. The mid fusiform gyrus showed the strongest, earliest response after stimulus onset, whereas activity was maximal in frontal, dorsal lateral prefrontal, and sensorimotor regions toward articulation onset. To evaluate interregional functional connectivity, ECoG data from electrodes situated over specific cortical regions of interest were fit into linear multivariate autoregressive (MVAR) models. Spectral characteristics of the MVAR models were used to precisely reveal the timing and the magnitude of information flow between localized brain regions. This is the first application of MVAR for developing a comprehensive account of interregional interactions from a word reading ECoG dataset. Our comprehensive findings revealed both top-down and bottom-up influences between higher-level language areas and the mid fusiform gyrus. Our findings thus challenge strictly hierarchical, feedforward views of word reading and suggest that orthographic processes are modulated by prefrontal and sensorimotor regions via an interactive framework. SIGNIFICANCE STATEMENT Word reading is a critical part of everyday life. When the ability to read is disrupted, it can lead to learning disorders, as well as emotional and academic difficulties. The neural mechanisms underlying word reading are not well understood due to limitations in the spatial and temporal specificity of prior word reading studies. Our research analyzed data recorded from sensors implanted directly from surface of human brains while these individuals performed a word reading task. Our research analyzed these recordings to infer how brain regions communicate during word reading. Our original results improve upon current models of word reading and can be used to develop treatment plans for individuals with reading disabilities.
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31
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Bastos AM, Schoffelen JM. A Tutorial Review of Functional Connectivity Analysis Methods and Their Interpretational Pitfalls. Front Syst Neurosci 2016; 9:175. [PMID: 26778976 PMCID: PMC4705224 DOI: 10.3389/fnsys.2015.00175] [Citation(s) in RCA: 539] [Impact Index Per Article: 67.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 11/30/2015] [Indexed: 12/30/2022] Open
Abstract
Oscillatory neuronal activity may provide a mechanism for dynamic network coordination. Rhythmic neuronal interactions can be quantified using multiple metrics, each with their own advantages and disadvantages. This tutorial will review and summarize current analysis methods used in the field of invasive and non-invasive electrophysiology to study the dynamic connections between neuronal populations. First, we review metrics for functional connectivity, including coherence, phase synchronization, phase-slope index, and Granger causality, with the specific aim to provide an intuition for how these metrics work, as well as their quantitative definition. Next, we highlight a number of interpretational caveats and common pitfalls that can arise when performing functional connectivity analysis, including the common reference problem, the signal to noise ratio problem, the volume conduction problem, the common input problem, and the sample size bias problem. These pitfalls will be illustrated by presenting a set of MATLAB-scripts, which can be executed by the reader to simulate each of these potential problems. We discuss how these issues can be addressed using current methods.
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Affiliation(s)
- André M Bastos
- Department of Brain and Cognitive Sciences, The Picower Institute for Learning and Memory, Massachusetts Institute of Technology Cambridge, MA, USA
| | - Jan-Mathijs Schoffelen
- Neurobiology of Language Department, Max Planck Institute for PsycholinguisticsNijmegen, Netherlands; Donders Centre for Cognitive Neuroimaging, Donders Institute for Brain, Cognition and Behaviour, Radboud University NijmegenNijmegen, Netherlands
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32
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Kadipasaoglu CM, Forseth K, Whaley M, Conner CR, Rollo MJ, Baboyan VG, Tandon N. Development of grouped icEEG for the study of cognitive processing. Front Psychol 2015; 6:1008. [PMID: 26257673 PMCID: PMC4508923 DOI: 10.3389/fpsyg.2015.01008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2015] [Accepted: 07/06/2015] [Indexed: 11/21/2022] Open
Abstract
Invasive intracranial EEG (icEEG) offers a unique opportunity to study human cognitive networks at an unmatched spatiotemporal resolution. To date, the contributions of icEEG have been limited to the individual-level analyses or cohorts whose data are not integrated in any way. Here we discuss how grouped approaches to icEEG overcome challenges related to sparse-sampling, correct for individual variations in response and provide statistically valid models of brain activity in a population. By the generation of whole-brain activity maps, grouped icEEG enables the study of intra and interregional dynamics between distributed cortical substrates exhibiting task-dependent activity. In this fashion, grouped icEEG analyses can provide significant advances in understanding the mechanisms by which cortical networks give rise to cognitive functions.
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Affiliation(s)
- Cihan M Kadipasaoglu
- Vivian Smith Department of Neurosurgery, University of Texas Health Science Center at Houston Houston, TX, USA
| | - Kiefer Forseth
- Vivian Smith Department of Neurosurgery, University of Texas Health Science Center at Houston Houston, TX, USA
| | - Meagan Whaley
- Vivian Smith Department of Neurosurgery, University of Texas Health Science Center at Houston Houston, TX, USA ; Department of Computational and Applied Mathematics, Rice University Houston, TX, USA
| | - Christopher R Conner
- Vivian Smith Department of Neurosurgery, University of Texas Health Science Center at Houston Houston, TX, USA
| | - Matthew J Rollo
- Vivian Smith Department of Neurosurgery, University of Texas Health Science Center at Houston Houston, TX, USA
| | - Vatche G Baboyan
- Vivian Smith Department of Neurosurgery, University of Texas Health Science Center at Houston Houston, TX, USA
| | - Nitin Tandon
- Vivian Smith Department of Neurosurgery, University of Texas Health Science Center at Houston Houston, TX, USA ; Texas Medical Center, Mischer Neuroscience Institute, Memorial Hermann Hospital Houston, TX, USA
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33
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Arnulfo G, Hirvonen J, Nobili L, Palva S, Palva JM. Phase and amplitude correlations in resting-state activity in human stereotactical EEG recordings. Neuroimage 2015; 112:114-127. [PMID: 25721426 DOI: 10.1016/j.neuroimage.2015.02.031] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 02/14/2015] [Indexed: 10/24/2022] Open
Abstract
Inter-areal interactions of neuronal oscillations may be a key mechanism in the coordination of anatomically distributed neuronal processing. In humans, invasive stereo-electroencephalography (SEEG) is emerging as a reference method for electrophysiological recordings because of its excellent spatial and temporal resolution. It could thus be also considered an optimal method for mapping neuronal inter-areal interactions. However, the common bipolar (BP) referencing of SEEG data may both confuse signals from distinct sources and suppress true neuronal interactions whereas the alternative monopolar (MP) reference yields data contaminated by volume conduction. We advance here a novel referencing scheme for SEEG data where electrodes in grey matter are referenced to closest white-matter (CW) electrodes. Using a 22 subject cohort and these three referencing schemes, we observed that both inter-areal phase and amplitude correlations decayed as function of distance and frequency but remained significant and stable across distances up to 10cm. Furthermore, we found that deep and superficial cortical laminae exhibit distinct spectral profiles of oscillation power as well as distinct patterns of inter-areal phase and amplitude interactions. These effects were qualitatively similar in MP and CW but distorted with BP referencing. Importantly CW was not influenced by the apparent large-scale volume conduction inherent to MP. We thus demonstrate here that with CW referencing, the superior anatomical accuracy of SEEG can be leveraged to yield accurate quantification and qualitatively novel insight into phase and amplitude interactions in human brain activity.
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Affiliation(s)
| | | | - Lino Nobili
- Claudio Munari Epilepsy Surgery Centre, Niguarda Hospital, Italy
| | - Satu Palva
- Neuroscience Center, University of Helsinki, Finland
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34
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Vidal JR, Perrone-Bertolotti M, Kahane P, Lachaux JP. Intracranial spectral amplitude dynamics of perceptual suppression in fronto-insular, occipito-temporal, and primary visual cortex. Front Psychol 2015; 5:1545. [PMID: 25642199 PMCID: PMC4295601 DOI: 10.3389/fpsyg.2014.01545] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Accepted: 12/14/2014] [Indexed: 12/13/2022] Open
Abstract
If conscious perception requires global information integration across active distant brain networks, how does the loss of conscious perception affect neural processing in these distant networks? Pioneering studies on perceptual suppression (PS) described specific local neural network responses in primary visual cortex, thalamus and lateral prefrontal cortex of the macaque brain. Yet the neural effects of PS have rarely been studied with intracerebral recordings outside these cortices and simultaneously across distant brain areas. Here, we combined (1) a novel experimental paradigm in which we produced a similar perceptual disappearance and also re-appearance by using visual adaptation with transient contrast changes, with (2) electrophysiological observations from human intracranial electrodes sampling wide brain areas. We focused on broadband high-frequency (50–150 Hz, i.e., gamma) and low-frequency (8–24 Hz) neural activity amplitude modulations related to target visibility and invisibility. We report that low-frequency amplitude modulations reflected stimulus visibility in a larger ensemble of recording sites as compared to broadband gamma responses, across distinct brain regions including occipital, temporal and frontal cortices. Moreover, the dynamics of the broadband gamma response distinguished stimulus visibility from stimulus invisibility earlier in anterior insula and inferior frontal gyrus than in temporal regions, suggesting a possible role of fronto-insular cortices in top–down processing for conscious perception. Finally, we report that in primary visual cortex only low-frequency amplitude modulations correlated directly with perceptual status. Interestingly, in this sensory area broadband gamma was not modulated during PS but became positively modulated after 300 ms when stimuli were rendered visible again, suggesting that local networks could be ignited by top–down influences during conscious perception.
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Affiliation(s)
- Juan R Vidal
- INSERM U1028, CNRS UMR5292, Lyon Neuroscience Research Center, Brain Dynamics and Cognition Team, Lyon - Université Claude Bernard Lyon 1, Lyon, France ; University Grenoble Alpes, LPNC, F -38040 Grenoble France ; CNRS, LPNC, UMR 5105, F -38040 Grenoble France
| | - Marcela Perrone-Bertolotti
- University Grenoble Alpes, LPNC, F -38040 Grenoble France ; CNRS, LPNC, UMR 5105, F -38040 Grenoble France
| | - Philippe Kahane
- CHU Grenoble and Department of Neurology, INSERM U704, F -38043 Grenoble France
| | - Jean-Philippe Lachaux
- INSERM U1028, CNRS UMR5292, Lyon Neuroscience Research Center, Brain Dynamics and Cognition Team, Lyon - Université Claude Bernard Lyon 1, Lyon, France
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35
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Mazaheri A, Fassbender C, Coffey-Corina S, Hartanto TA, Schweitzer JB, Mangun GR. Differential oscillatory electroencephalogram between attention-deficit/hyperactivity disorder subtypes and typically developing adolescents. Biol Psychiatry 2014; 76:422-9. [PMID: 24120092 PMCID: PMC3972379 DOI: 10.1016/j.biopsych.2013.08.023] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Revised: 08/15/2013] [Accepted: 08/22/2013] [Indexed: 11/27/2022]
Abstract
BACKGROUND A neurobiological-based classification of attention-deficit/hyperactivity disorder (ADHD) subtypes has thus far remained elusive. The aim of this study was to use oscillatory changes in the electroencephalogram (EEG) related to informative cue processing, motor preparation, and top-down control to investigate neurophysiological differences between typically developing (TD) adolescents, and those diagnosed with predominantly inattentive (IA) or combined (CB) (associated with symptoms of inattention as well as impulsivity/hyperactivity) subtypes of ADHD. METHODS The EEG was recorded from 57 rigorously screened adolescents (12 to 17 years of age; 23 TD, 17 IA, and 17 CB), while they performed a cued flanker task. We examined the oscillatory changes in theta (3-5 Hz), alpha (8-12 Hz), and beta (22-25 Hz) EEG bands after cues that informed participants with which hand they would subsequently be required to respond. RESULTS Relative to TD adolescents, the IA group showed significantly less postcue alpha suppression, suggesting diminished processing of the cue in the visual cortex, whereas the CB group showed significantly less beta suppression at the electrode contralateral to the cued response hand, suggesting poor motor planning. Finally, both ADHD subtypes showed weak functional connectivity between frontal theta and posterior alpha, suggesting common top-down control impairment. CONCLUSIONS We found both distinct and common task-related neurophysiological impairments in ADHD subtypes. Our results suggest that task-induced changes in EEG oscillations provide an objective measure, which in conjunction with other sources of information might help distinguish between ADHD subtypes and therefore aid in diagnoses and evaluation of treatment.
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Affiliation(s)
- Ali Mazaheri
- Academic Medical Center, Department of Psychiatry, University of Amsterdam, The Netherlands.
| | - Catherine Fassbender
- M.I.N.D. Institute, University of California, Davis, CA, USA,Department of Psychiatry and Behavioral Sciences, University of California, Davis, CA, USA,Imaging Research Center, University of California, Davis, CA, USA,Center for Mind and Brain, University of California, Davis, CA, USA
| | | | | | - Julie B. Schweitzer
- M.I.N.D. Institute, University of California, Davis, CA, USA,Department of Psychiatry and Behavioral Sciences, University of California, Davis, CA, USA
| | - George R. Mangun
- Center for Mind and Brain, University of California, Davis, CA, USA,Department of Psychology, University of California, Davis, CA, USA,Department of Neurology, University of California, Davis, CA, USA
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Hamamé CM, Alario FX, Llorens A, Liégeois-Chauvel C, Trébuchon-Da Fonseca A. High frequency gamma activity in the left hippocampus predicts visual object naming performance. BRAIN AND LANGUAGE 2014; 135:104-114. [PMID: 25016093 DOI: 10.1016/j.bandl.2014.05.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 04/14/2014] [Accepted: 05/26/2014] [Indexed: 06/03/2023]
Abstract
Access to an object's name requires the retrieval of an arbitrary association between it's identity and a word-label. The hippocampus is essential in retrieving arbitrary associations, and thus could be involved in retrieving the link between an object and its name. To test this hypothesis we recorded the iEEG signal from epileptic patients, directly implanted in the hippocampus, while they performed a picture naming task. High-frequency broadband gamma (50-150 Hz) responses were computed as an index of population-level spiking activity. Our results show, for the first time, single-trial hippocampal dynamics between visual confrontation and naming. Remarkably, the latency of the hippocampal response predicts naming latency, while inefficient hippocampal activation is associated with "tip-of-the-tongue" states (a failure to retrieve the name of a recognized object) suggesting that the hippocampus is an active component of the naming network and that its dynamics are closely related to efficient word production.
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Affiliation(s)
- Carlos M Hamamé
- Aix-Marseille Université, CNRS, LPC UMR 7290, Marseille 13001, France.
| | - F-Xavier Alario
- Aix-Marseille Université, CNRS, LPC UMR 7290, Marseille 13001, France
| | - Anais Llorens
- Aix-Marseille Université, CNRS, LPC UMR 7290, Marseille 13001, France; Aix-Marseille Université, Inserm, INS UMR_S 1106, Marseille 13005, France
| | | | - Agnés Trébuchon-Da Fonseca
- Aix-Marseille Université, Inserm, INS UMR_S 1106, Marseille 13005, France; APHM, Centre Hospitalier de la Timone, Marseille 13005, France
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Levy J, Hagoort P, Démonet JF. A neuronal gamma oscillatory signature during morphological unification in the left occipitotemporal junction. Hum Brain Mapp 2014; 35:5847-60. [PMID: 25044125 DOI: 10.1002/hbm.22589] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Revised: 07/04/2014] [Accepted: 07/09/2014] [Indexed: 11/09/2022] Open
Abstract
Morphology is the aspect of language concerned with the internal structure of words. In the past decades, a large body of masked priming (behavioral and neuroimaging) data has suggested that the visual word recognition system automatically decomposes any morphologically complex word into a stem and its constituent morphemes. Yet the reliance of morphology on other reading processes (e.g., orthography and semantics), as well as its underlying neuronal mechanisms are yet to be determined. In the current magnetoencephalography study, we addressed morphology from the perspective of the unification framework, that is, by applying the Hold/Release paradigm, morphological unification was simulated via the assembly of internal morphemic units into a whole word. Trials representing real words were divided into words with a transparent (true) or a nontransparent (pseudo) morphological relationship. Morphological unification of truly suffixed words was faster and more accurate and additionally enhanced induced oscillations in the narrow gamma band (60-85 Hz, 260-440 ms) in the left posterior occipitotemporal junction. This neural signature could not be explained by a mere automatic lexical processing (i.e., stem perception), but more likely it related to a semantic access step during the morphological unification process. By demonstrating the validity of unification at the morphological level, this study contributes to the vast empirical evidence on unification across other language processes. Furthermore, we point out that morphological unification relies on the retrieval of lexical semantic associations via induced gamma band oscillations in a cerebral hub region for visual word form processing.
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Affiliation(s)
- Jonathan Levy
- The Gonda Multidisciplinary Brain Research Center, Bar Ilan University, Ramat Gan, Israel; Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, Nijmegen, The Netherlands; Inserm UMR825, Imagerie cerebrale et handicaps neurologiques, Toulouse, France; Université de Toulouse, UPS, Toulouse, France
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Functional selectivity in the human occipitotemporal cortex during natural vision: Evidence from combined intracranial EEG and eye-tracking. Neuroimage 2014; 95:276-86. [DOI: 10.1016/j.neuroimage.2014.03.025] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Revised: 02/12/2014] [Accepted: 03/10/2014] [Indexed: 11/20/2022] Open
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Vidal JR, Perrone-Bertolotti M, Levy J, De Palma L, Minotti L, Kahane P, Bertrand O, Lutz A, Jerbi K, Lachaux JP. Neural repetition suppression in ventral occipito-temporal cortex occurs during conscious and unconscious processing of frequent stimuli. Neuroimage 2014; 95:129-35. [PMID: 24667455 DOI: 10.1016/j.neuroimage.2014.03.049] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 03/16/2014] [Accepted: 03/17/2014] [Indexed: 01/21/2023] Open
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40
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Abstract
Sensory signals must be interpreted in the context of goals and tasks. To detect a target in an image, the brain compares input signals and goals to elicit the correct behavior. We examined how target detection modulates visual recognition signals by recording intracranial field potential responses from 776 electrodes in 10 epileptic human subjects. We observed reliable differences in the physiological responses to stimuli when a cued target was present versus absent. Goal-related modulation was particularly strong in the inferior temporal and fusiform gyri, two areas important for object recognition. Target modulation started after 250 ms post stimulus, considerably after the onset of visual recognition signals. While broadband signals exhibited increased or decreased power, gamma frequency power showed predominantly increases during target presence. These observations support models where task goals interact with sensory inputs via top-down signals that influence the highest echelons of visual processing after the onset of selective responses.
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Fast dynamics of cortical functional and effective connectivity during word reading. PLoS One 2014; 9:e88940. [PMID: 24551193 PMCID: PMC3925174 DOI: 10.1371/journal.pone.0088940] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Accepted: 01/13/2014] [Indexed: 11/19/2022] Open
Abstract
We describe for the first time the fast dynamics of functional and effective (causal) connectivity during word reading. Independent component analysis of high-density EEG recorded during a word reading task recovered multiple sources of electrical brain activity previously identified by fMRI and PET. Results confirmed the ventral occipito-temporal cortex (vOT) as a central hub for word reading, showing a progression of theta-band (3–7 Hz) and gamma-band (30–50 Hz) phase synchronization and directed theta-band and gamma-band information flow with both early visual areas and high-level language-processing areas. These results highlight the interplay between local and long-distance neural dynamics involved at each stage of the reading process. Moreover, these measures of functional and causal connectivity dynamics may be used as a benchmark for comparison with clinical populations (e.g. individuals with developmental dyslexia), such that disturbances in connectivity dynamics may provide insight as to underlying neurological problems with language processing, and their potential remediation.
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42
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Caruana F, Sartori I, Lo Russo G, Avanzini P. Sequencing biological and physical events affects specific frequency bands within the human premotor cortex: an intracerebral EEG study. PLoS One 2014; 9:e86384. [PMID: 24466067 PMCID: PMC3895027 DOI: 10.1371/journal.pone.0086384] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Accepted: 12/11/2013] [Indexed: 12/02/2022] Open
Abstract
Evidence that the human premotor cortex (PMC) is activated by cognitive functions involving the motor domain is classically explained as the reactivation of a motor program decoupled from its executive functions, and exploited for different purposes by means of a motor simulation. In contrast, the evidence that PMC contributes to the sequencing of non-biological events cannot be explained by the simulationist theory. Here we investigated how motor simulation and event sequencing coexist within the PMC and how these mechanisms interact when both functions are executed. We asked patients with depth electrodes implanted in the PMC to passively observe a randomized arrangement of images depicting biological actions and physical events and, in a second block, to sequence them in the correct order. This task allowed us to disambiguate between the simple observation of actions, their sequencing (recruiting different motor simulation processes), as well as the sequencing of non-biological events (recruiting a sequencer mechanism non dependant on motor simulation). We analysed the response of the gamma, alpha and beta frequency bands to evaluate the contribution of each brain rhythm to the observation and sequencing of both biological and non-biological stimuli. We found that motor simulation (biological>physical) and event sequencing (sequencing>observation) differently affect the three investigated frequency bands: motor simulation was reflected on the gamma and, partially, in the beta, but not in the alpha band. In contrast, event sequencing was also reflected on the alpha band.
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Affiliation(s)
- Fausto Caruana
- Brain Center for Social and Motor Cognition, Italian Institute of Technology, Parma, Italy
- Department of Neuroscience, University of Parma, Parma, Italy
- * E-mail:
| | - Ivana Sartori
- Claudio Munari Center for Epilepsy Surgery, Ospedale Niguarda-Ca’ Granda, Milan, Italy
| | - Giorgio Lo Russo
- Claudio Munari Center for Epilepsy Surgery, Ospedale Niguarda-Ca’ Granda, Milan, Italy
| | - Pietro Avanzini
- Department of Neuroscience, University of Parma, Parma, Italy
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Perrone-Bertolotti M, Vidal JR, de Palma L, Hamamé CM, Ossandon T, Kahane P, Minotti L, Bertrand O, Lachaux JP. Turning visual shapes into sounds: early stages of reading acquisition revealed in the ventral occipitotemporal cortex. Neuroimage 2013; 90:298-307. [PMID: 24370818 DOI: 10.1016/j.neuroimage.2013.12.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 12/04/2013] [Accepted: 12/11/2013] [Indexed: 10/25/2022] Open
Abstract
The exact role of the left ventral occipitotemporal cortex (VOTC) during the initial stages of reading acquisition is a hotly debated issue, especially regarding the comparative effect of learning on early stimulus-dependent vs. later task-dependent processes. We show that this controversy can be solved with high-temporal resolution intracerebral EEG recordings of the VOTC. We measured High-Frequency Activity (50-150 Hz) as a proxy of population-level spiking activity while participants learned Japanese Katakana symbols, and found that learning primarily affects top-down/task-dependent neural processing, after a few minutes only. In contrast, adaptation of early bottom-up/stimulus-dependent processing takes several days to adapt and provides the basis for fluent reading. Such evidence that two consecutive stages of neural processing, stimulus- and task-dependent are differentially affected by learning, can reconcile seemingly opposite hypotheses on the role of the VOTC during reading acquisition.
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Affiliation(s)
- M Perrone-Bertolotti
- Univ. Grenoble Alpes, LPNC, F-38040 Grenoble, France; CNRS, LPNC UMR 5105, F-38040 Grenoble, France; INSERM U1028-CNRS UMR5292, Brain Dynamics and Cognition Team, Lyon Neuroscience Research Center, F-69500 Lyon-Bron, France; University Claude Bernard, Lyon 1, F-69000 Lyon, France; INSERM, U836, Grenoble Institut des Neurosciences, 38700 La Tronche, France.
| | - J R Vidal
- INSERM U1028-CNRS UMR5292, Brain Dynamics and Cognition Team, Lyon Neuroscience Research Center, F-69500 Lyon-Bron, France; University Claude Bernard, Lyon 1, F-69000 Lyon, France
| | - L de Palma
- CHU Grenoble and Department of Neurology, INSERM U704, F-38043 Grenoble, France
| | - C M Hamamé
- Laboratoire de Psychologie Cognitive, CNRS (UMR 6146), Aix-Marseille Universite, 13003 Marseille Cedex, France
| | - T Ossandon
- Departamento de Psiquiatría, Facultad de Medicina y Centro Interdisciplinario de Neurociencia, Pontificia Universidad Catolica de Chile, CL-8330024 Santiago, Chile
| | - P Kahane
- INSERM, U836, Grenoble Institut des Neurosciences, 38700 La Tronche, France; CHU Grenoble and Department of Neurology, INSERM U704, F-38043 Grenoble, France
| | - L Minotti
- INSERM, U836, Grenoble Institut des Neurosciences, 38700 La Tronche, France; CHU Grenoble and Department of Neurology, INSERM U704, F-38043 Grenoble, France
| | - O Bertrand
- INSERM U1028-CNRS UMR5292, Brain Dynamics and Cognition Team, Lyon Neuroscience Research Center, F-69500 Lyon-Bron, France; University Claude Bernard, Lyon 1, F-69000 Lyon, France
| | - J-P Lachaux
- INSERM U1028-CNRS UMR5292, Brain Dynamics and Cognition Team, Lyon Neuroscience Research Center, F-69500 Lyon-Bron, France; University Claude Bernard, Lyon 1, F-69000 Lyon, France
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Mäki-Marttunen V, Diez I, Cortes JM, Chialvo DR, Villarreal M. Disruption of transfer entropy and inter-hemispheric brain functional connectivity in patients with disorder of consciousness. Front Neuroinform 2013; 7:24. [PMID: 24312048 PMCID: PMC3826091 DOI: 10.3389/fninf.2013.00024] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Accepted: 10/10/2013] [Indexed: 11/19/2022] Open
Abstract
Severe traumatic brain injury can lead to disorders of consciousness (DOC) characterized by deficit in conscious awareness and cognitive impairment including coma, vegetative state, minimally consciousness, and lock-in syndrome. Of crucial importance is to find objective markers that can account for the large-scale disturbances of brain function to help the diagnosis and prognosis of DOC patients and eventually the prediction of the coma outcome. Following recent studies suggesting that the functional organization of brain networks can be altered in comatose patients, this work analyzes brain functional connectivity (FC) networks obtained from resting-state functional magnetic resonance imaging (rs-fMRI). Two approaches are used to estimate the FC: the Partial Correlation (PC) and the Transfer Entropy (TE). Both the PC and the TE show significant statistical differences between the group of patients and control subjects; in brief, the inter-hemispheric PC and the intra-hemispheric TE account for such differences. Overall, these results suggest two possible rs-fMRI markers useful to design new strategies for the management and neuropsychological rehabilitation of DOC patients.
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Affiliation(s)
- Verónica Mäki-Marttunen
- Department of Cognitive Neuroscience, Institute for Neurological Research, FLENI Buenos Aires, Argentina ; CONICET Buenos Aires, Argentina
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45
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Petitmengin C, Lachaux JP. Microcognitive science: bridging experiential and neuronal microdynamics. Front Hum Neurosci 2013; 7:617. [PMID: 24098279 PMCID: PMC3784800 DOI: 10.3389/fnhum.2013.00617] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Accepted: 09/07/2013] [Indexed: 11/13/2022] Open
Abstract
Neurophenomenology, as an attempt to combine and mutually enlighten neural and experiential descriptions of cognitive processes, has met practical difficulties which have limited its implementation into actual research projects. The main difficulty seems to be the disparity of the levels of description: while neurophenomenology strongly emphasizes the micro-dynamics of experience, at the level of brief mental events with very specific content, most neural measures have much coarser functional selectivity, because they mix functionally heterogeneous neural processes either in space or in time. We propose a new starting point for this neurophenomenology, based on (a) the recent development of human intra-cerebral EEG (iEEG) research to highlight the neural micro-dynamics of human cognition, with millimetric and millisecond precision and (b) a disciplined access to the experiential micro-dynamics, through specific elicitation techniques. This lays the foundation for a microcognitive science, the practical implementation of neurophenomenology to combine the neural and experiential investigations of human cognition at the subsecond level.
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Affiliation(s)
- Claire Petitmengin
- Télécom École de Management, Institut Mines-Télécom Evry, France ; Archives Husserl, École Normale Supérieure Paris, France
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Levy J, Vidal JR, Oostenveld R, FitzPatrick I, Démonet JF, Fries P. Alpha-band suppression in the visual word form area as a functional bottleneck to consciousness. Neuroimage 2013; 78:33-45. [DOI: 10.1016/j.neuroimage.2013.04.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 03/26/2013] [Accepted: 04/02/2013] [Indexed: 11/30/2022] Open
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47
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Anand KJS, Papanicolaou AC, Palmer FB. Repetitive neonatal pain and neurocognitive abilities in ex-preterm children. Pain 2013; 154:1899-1901. [PMID: 23792285 DOI: 10.1016/j.pain.2013.06.027] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2013] [Revised: 06/14/2013] [Accepted: 06/17/2013] [Indexed: 12/22/2022]
Affiliation(s)
- Kanwaljeet J S Anand
- St. Jude Endowed Chair for Critical Care Medicine, University of Tennessee Health Science Center, Memphis, TN, USA Boling Center for Developmental Disabilities, University of Tennessee Health Science Center, Memphis, TN, USA Division of Clinical Neurosciences, University of Tennessee Health Science Center, Memphis, TN, USA
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48
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Functional connectivity and oscillatory neuronal activity in the resting human brain. Neuroscience 2013; 240:297-309. [DOI: 10.1016/j.neuroscience.2013.02.032] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2012] [Revised: 01/23/2013] [Accepted: 02/13/2013] [Indexed: 11/23/2022]
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Brázdil M, Janeček J, Klimeš P, Mareček R, Roman R, Jurák P, Chládek J, Daniel P, Rektor I, Halámek J, Plešinger F, Jirsa V. On the time course of synchronization patterns of neuronal discharges in the human brain during cognitive tasks. PLoS One 2013; 8:e63293. [PMID: 23696809 PMCID: PMC3655978 DOI: 10.1371/journal.pone.0063293] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Accepted: 03/29/2013] [Indexed: 11/24/2022] Open
Abstract
Using intracerebral EEG recordings in a large cohort of human subjects, we investigate the time course of neural cross-talk during a simple cognitive task. Our results show that human brain dynamics undergo a characteristic sequence of synchronization patterns across different frequency bands following a visual oddball stimulus. In particular, an initial global reorganization in the delta and theta bands (2-8 Hz) is followed by gamma (20-95 Hz) and then beta band (12-20 Hz) synchrony.
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Affiliation(s)
- Milan Brázdil
- Behavioural and Social Neuroscience Research Group, CEITEC-Central European Institute of Technology, Masaryk University, Brno, Czech Republic.
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Zhang D, Song H, Xu R, Zhou W, Ling Z, Hong B. Toward a minimally invasive brain–computer interface using a single subdural channel: A visual speller study. Neuroimage 2013; 71:30-41. [PMID: 23313779 DOI: 10.1016/j.neuroimage.2012.12.069] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Revised: 11/29/2012] [Accepted: 12/29/2012] [Indexed: 02/07/2023] Open
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