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Hsu WY, Zanto T, Park JE, Gazzaley A, Bove RM. Effects of transcranial alternating current stimulation on cognitive function in people with multiple sclerosis: A randomized controlled trial. Mult Scler Relat Disord 2023; 80:105090. [PMID: 37925960 DOI: 10.1016/j.msard.2023.105090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 09/14/2023] [Accepted: 10/18/2023] [Indexed: 11/07/2023]
Abstract
BACKGROUND Cognitive impairment is a core symptom that profoundly impacts the lives of people with multiple sclerosis (PwMS). Since the existing disease modifying therapies can only stabilize, but not actively treat, cognition in PwMS, there is an unmet need to expand approaches to treat these cognitive symptoms. Transcranial alternating current stimulation (tACS) permits frequency-specific entrainment of neural oscillations intrinsic to cognitive activity. However, the effects of the tACS on cognitive function in PwMS have not yet been assessed. We aimed to evaluate the potential efficacy of applying frontal theta-tACS to improve information processing speed in PwMS. METHODS 60 PwMS with cognitive complaints were enrolled in a double-blinded, randomized, controlled trial with three stimulation groups: 2 mA, 1 mA, or sham control. A single session of theta-tACS was applied while participants were engaged in a cognitive program which has shown to improve processing speed in PwMS. tACS effects were examined by the Symbol Digit Modalities Test (SDMT). Tolerability, side effects and acceptability were measured. RESULTS 1 mA groups had a significantly higher SDMT score after stimulation compared to their pre-stimulation score, 2 mA group showed a marginally significant improvement of their SDMT score, while the SDMT score in the sham group did not change. Overall, 49% of the stimulation group participants showed a clinically meaningful SDMT improvement (4+-point increase). CONCLUSION tACS is a well-tolerated, non-pharmacological intervention. Based on the positive effects observed in the current study of a single session of tACS applied during cognitive engagement, the effects of repeated tACS on cognitive function in PwMS merit further research. TRIAL REGISTRATION ClinicalTrials.gov NCT04466228.
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Affiliation(s)
- Wan-Yu Hsu
- UCSF Weill Institute for Neurosciences, Department of Neurology, University of California, 1651 4th St, San Francisco, CA 94158, USA.
| | - Theodore Zanto
- UCSF Weill Institute for Neurosciences, Department of Neurology, University of California, 1651 4th St, San Francisco, CA 94158, USA; Neuroscape, University of California San Francisco, San Francisco, CA, USA
| | - Jee Eun Park
- UCSF Weill Institute for Neurosciences, Department of Neurology, University of California, 1651 4th St, San Francisco, CA 94158, USA; Neuroscape, University of California San Francisco, San Francisco, CA, USA; Department of Psychiatry, Seoul National University College of Medicine and Seoul National University Hospital, Seoul, South Korea
| | - Adam Gazzaley
- UCSF Weill Institute for Neurosciences, Department of Neurology, University of California, 1651 4th St, San Francisco, CA 94158, USA; Neuroscape, University of California San Francisco, San Francisco, CA, USA
| | - Riley M Bove
- UCSF Weill Institute for Neurosciences, Department of Neurology, University of California, 1651 4th St, San Francisco, CA 94158, USA
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Russo JS, Chodhary M, Strik M, Shiels TA, Lin CHS, John SE, Grayden DB. Feasibility of Using Source-Level Brain Computer Interface for People with Multiple Sclerosis. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2023; 2023:1-4. [PMID: 38083693 DOI: 10.1109/embc40787.2023.10340364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
This work evaluates the feasibility of using a source level Brain-Computer Interface (BCI) for people with Multiple Sclerosis (MS). Data used was previously collected EEG of eight participants (one participant with MS and seven neurotypical participants) who performed imagined movement of the right and left hand. Equivalent current dipole cluster fitting was used to assess related brain activity at the source level and assessed using dipole location and power spectrum analysis. Dipole clusters were resolved within the motor cortices with some notable spatial difference between the MS and control participants. Neural sources that generate motor imagery originated from similar motor areas in the participant with MS compared to the neurotypical participants. Power spectral analysis indicated a reduced level of alpha power in the participant with MS during imagery tasks compared to neurotypical participants. Power in the beta band may be used to distinguish between left and right imagined movement for users with MS in BCI applications.Clinical Relevance- This paper demonstrates the cortical areas activated during imagined BCI-type tasks in a participant with Multiple Sclerosis (MS), and is a proof of concept for translating BCI research to potential users with MS.
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Sarrias-Arrabal E, Martín-Clemente R, Galvao-Carmona A, Benítez-Lugo ML, Vázquez-Marrufo M. Effect of the side of presentation in the visual field on phase-locked and nonphase-locked alpha and gamma responses. Sci Rep 2022; 12:13200. [PMID: 35915098 PMCID: PMC9343444 DOI: 10.1038/s41598-022-15936-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 07/01/2022] [Indexed: 11/09/2022] Open
Abstract
Recent studies have suggested that nonphase-locked activity can reveal cognitive mechanisms that cannot be observed in phase-locked activity. In fact, we describe a concomitant decrease in nonphase-locked alpha activity (desynchronization) when stimuli were processed (alpha phase-locked modulation). This desynchronization may represent a reduction in "background activity" in the visual cortex that facilitates stimulus processing. Alternatively, nonphase-locked gamma activity has been hypothesized to be an index of shifts in attentional focus. In this study, our main aim was to confirm these potential roles for nonphase-locked alpha and gamma activities with a lateralized Go/NoGo paradigm. The results showed that nonphase-locked alpha modulation is bilaterally represented in the scalp compared to the contralateral distribution of the phase-locked response. This finding suggests that the decrease in background activity is not limited to neural areas directly involved in the visual processing of stimuli. Additionally, gamma activity showed a higher desynchronization of nonphase-locked activity in the ipsilateral hemisphere, where the phase-locked activity reached the minimum amplitude. This finding suggests that the possible functions of nonphase-locked gamma activity extend beyond shifts in attentional focus and could represent an attentional filter reducing the gamma representation in the visual area irrelevant to the task.
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Affiliation(s)
- Esteban Sarrias-Arrabal
- Lab B508 (Psychophysiology Unit), Experimental Psychology Department, Faculty of Psychology, University of Seville, Seville, Spain.
| | - Ruben Martín-Clemente
- Signal Processing and Communications Department, Higher Technical School of Engineering, University of Seville, Seville, Spain
| | | | - María Luisa Benítez-Lugo
- Physiotherapy Department, Faculty of Nursing, Physiotherapy and Chiropody, University of Seville, Seville, Spain
| | - Manuel Vázquez-Marrufo
- Lab B508 (Psychophysiology Unit), Experimental Psychology Department, Faculty of Psychology, University of Seville, Seville, Spain
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Sarrias-Arrabal E, Eichau S, Galvao-Carmona A, Domínguez E, Izquierdo G, Vázquez-Marrufo M. Deficits in Early Sensory and Cognitive Processing Are Related to Phase and Nonphase EEG Activity in Multiple Sclerosis Patients. Brain Sci 2021; 11:brainsci11050629. [PMID: 34068315 PMCID: PMC8153279 DOI: 10.3390/brainsci11050629] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 05/10/2021] [Accepted: 05/11/2021] [Indexed: 12/05/2022] Open
Abstract
Currently, there is scarce knowledge about the relation between spectral bands modulations and the basis of cognitive impairment in multiple sclerosis (MS). In this sense, analyzing the evoked or phase activity can confirm results from traditional event-related potential (ERP) studies. However, studying the induced or nonphase activity may be necessary to elucidate hidden compensatory or affected cognitive mechanisms. In this study, 30 remitting-relapsing multiple sclerosis patients and 30 healthy controls (HCs) matched in sociodemographic variables performed a visual oddball task. The main goal was to analyze phase and nonphase alpha and gamma bands by applying temporal spectral evolution (TSE) and its potential relation with cognitive impairment in these patients. The behavioural results showed slower reaction time and poorer accuracy in MS patients compared to controls. In contrast, the time-frequency analysis of electroencephalography (EEG) revealed a delay in latency and lower amplitude in MS patients in evoked and induced alpha compared to controls. With respect to the gamma band, there were no differences between the groups. In summary, MS patients showed deficits in early sensorial (evoked alpha activity) and cognitive processing (induced alpha activity in longer latencies), whereas the induced gamma band supported the hypothesis of its role in translation of attentional focus (induced activity) and did not show strong activity in this paradigm (visual oddball).
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Affiliation(s)
- Esteban Sarrias-Arrabal
- Experimental Psychology Department, Faculty of Psychology, University of Seville, 41018 Seville, Spain;
- Correspondence: ; Tel.: +34-676-182-823
| | - Sara Eichau
- Unit CSUR Multiple Sclerosis, Hospital Virgen Macarena, 41009 Seville, Spain;
| | | | - Elvira Domínguez
- Unit of Multiple Sclerosis, FISEVI, Hospital Virgen Macarena, 41009 Seville, Spain;
| | | | - Manuel Vázquez-Marrufo
- Experimental Psychology Department, Faculty of Psychology, University of Seville, 41018 Seville, Spain;
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Paolicelli D, Manni A, Iaffaldano A, Tancredi G, Ricci K, Gentile E, Viterbo RG, Quitadamo SG, de Tommaso M, Trojano M. Magnetoencephalography and High-Density Electroencephalography Study of Acoustic Event Related Potentials in Early Stage of Multiple Sclerosis: A Pilot Study on Cognitive Impairment and Fatigue. Brain Sci 2021; 11:481. [PMID: 33918861 PMCID: PMC8069556 DOI: 10.3390/brainsci11040481] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 04/06/2021] [Accepted: 04/07/2021] [Indexed: 11/16/2022] Open
Abstract
Cognitive impairment (CI) is a common and disabling symptom of Multiple Sclerosis (MS) with a negative impact on daily living. In this pilot study, we applied magnetoencephalography (MEG) and high density (hd) electroencephalography (EEG) study to evaluate acoustic P300 features in a cohort of early MS. Sixteen MS patients (pwMS) and 19 healthy controls (HCs) matched for age and gender underwent an MEG-/(hd)-EEG-co-recording, using 306-channel Vectorview and 64 scalp electrodes. CI was assessed using Rao's Brief Repeatable Battery (BRB). Moreover, we performed psychometric tests to assess depression and fatigue. In pwMS, we observed a slight latency prolongation of P300 peak compared to HCs, while P300 amplitude and scalp distribution were similar in the two groups. pwMS did not show an amplitude reduction and different scalp distribution of Event-Related Potentials (ERPs) and Event Related Fields (ERFs) related to an acoustic oddball paradigm. We found an inverse correlation between P300 amplitude and fatigue (r Spearman = -0.4; p = 0.019). In pwMS, phenomena of cortical adaptation to early dysfunction could preserve the cognitive performance of the P300 acoustic task, while the development of fatigue could prospectively lead to amplitude decline of P300, suggesting its possible role as a biomarker.
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Affiliation(s)
- Damiano Paolicelli
- Department of Basic Medical Sciences, Neurosciences, and Sense Organs, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.M.); (A.I.); (G.T.); (K.R.); (R.G.V.); (S.G.Q.); (M.d.T.); (M.T.)
| | - Alessia Manni
- Department of Basic Medical Sciences, Neurosciences, and Sense Organs, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.M.); (A.I.); (G.T.); (K.R.); (R.G.V.); (S.G.Q.); (M.d.T.); (M.T.)
| | - Antonio Iaffaldano
- Department of Basic Medical Sciences, Neurosciences, and Sense Organs, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.M.); (A.I.); (G.T.); (K.R.); (R.G.V.); (S.G.Q.); (M.d.T.); (M.T.)
| | - Giusy Tancredi
- Department of Basic Medical Sciences, Neurosciences, and Sense Organs, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.M.); (A.I.); (G.T.); (K.R.); (R.G.V.); (S.G.Q.); (M.d.T.); (M.T.)
| | - Katia Ricci
- Department of Basic Medical Sciences, Neurosciences, and Sense Organs, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.M.); (A.I.); (G.T.); (K.R.); (R.G.V.); (S.G.Q.); (M.d.T.); (M.T.)
| | - Eleonora Gentile
- Basic Health District, Family Counseling Center, ASP (Local Health Company), 85038 Senise, Italy;
| | - Rosa Gemma Viterbo
- Department of Basic Medical Sciences, Neurosciences, and Sense Organs, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.M.); (A.I.); (G.T.); (K.R.); (R.G.V.); (S.G.Q.); (M.d.T.); (M.T.)
| | - Silvia Giovanna Quitadamo
- Department of Basic Medical Sciences, Neurosciences, and Sense Organs, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.M.); (A.I.); (G.T.); (K.R.); (R.G.V.); (S.G.Q.); (M.d.T.); (M.T.)
| | - Marina de Tommaso
- Department of Basic Medical Sciences, Neurosciences, and Sense Organs, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.M.); (A.I.); (G.T.); (K.R.); (R.G.V.); (S.G.Q.); (M.d.T.); (M.T.)
| | - Maria Trojano
- Department of Basic Medical Sciences, Neurosciences, and Sense Organs, University of Bari “Aldo Moro”, 70121 Bari, Italy; (A.M.); (A.I.); (G.T.); (K.R.); (R.G.V.); (S.G.Q.); (M.d.T.); (M.T.)
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Altered phase and nonphase EEG activity expose impaired maintenance of a spatial-object attentional focus in multiple sclerosis patients. Sci Rep 2020; 10:20721. [PMID: 33244155 PMCID: PMC7691340 DOI: 10.1038/s41598-020-77690-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 11/04/2020] [Indexed: 11/09/2022] Open
Abstract
Some of the anatomical and functional basis of cognitive impairment in multiple sclerosis (MS) currently remains unknown. In particular, there is scarce knowledge about modulations in induced EEG (nonphase activity) for diverse frequency bands related to attentional deficits in this pathology. The present study analyzes phase and nonphase alpha and gamma modulations in 26 remitting-relapsing multiple sclerosis patients during their participation in the attention network test compared with twenty-six healthy controls (HCs) matched in sociodemographic variables. Behavioral results showed that the MS group exhibited general slowing, suggesting impairment in alerting and orienting networks, as has been previously described in other studies. Time–frequency analysis of EEG revealed that the gamma band was related to the spatial translation of the attentional focus, and the alpha band seemed to be related to the expectancy mechanisms and cognitive processing of the target. Moreover, phase and nonphase modulations differed in their psychophysiological roles and were affected differently in the MS and HC groups. In summary, nonphase modulations can unveil hidden cognitive mechanisms for phase analysis and complete our knowledge of the neural basis of cognitive impairment in multiple sclerosis pathology.
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Vázquez-Marrufo M, Galvao-Carmona A, Caballero-Díaz R, Borges M, Paramo MD, Benítez-Lugo ML, Ruiz-Peña JL, Izquierdo G. Altered individual behavioral and EEG parameters are related to the EDSS score in relapsing-remitting multiple sclerosis patients. PLoS One 2019; 14:e0219594. [PMID: 31306457 PMCID: PMC6629079 DOI: 10.1371/journal.pone.0219594] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 06/27/2019] [Indexed: 11/18/2022] Open
Abstract
Functional neuroanatomy of cognitive impairment in multiple sclerosis is currently still a challenge. During the progression of the disease, several cognitive mechanisms deteriorate thus diminishing the patient’s quality of life. A primary objective in the cognitive assessment of multiple sclerosis (MS) patients is to find reliable measures utilizing diverse neuroimaging techniques. Moreover, especially relevant in the clinical environment is finding technical approaches that could be applied to individual participants and not only for group analysis. A 64-channel electroencephalographic recording (EEG) was made with thirty participants divided into three groups of equivalent size (N = 10) (healthy control, low-EDSS (1–2.5) and moderate-EDSS (4–6)). Correlation analysis was applied to multiple measures: behavior, neuropsychological tests (Paced Auditory Serial Addition Test, 3 seconds (PASAT-3s) and the Symbol Digit Modality Test (SDMT)), Expanded Disability Status Scale (EDSS), even-related potential (P3) and event-related desynchronization (ERD) parameters and the correlation scores between individual participant’s P3/ERD maps and the healthy grand average P3/ERDmaps. Statistical analysis showed that diverse parameters exhibited significant correlations. A remarkable correlation was the moderate score found between SDMT and EDSS (r = −0.679, p = 0.0009). However, the strongest correlation was between the value of integrated measures (reaction time, P3 and ERD latency) and EDSS (r = 0.699, p = 0.0006). In regard to correlations for grand average maps between groups, the P3 component exhibited a lower score according to a more deteriorated condition (higher EDSS). In contrast, ERD maps remained stable with an increase of EDSS. Lastly, a Z-transformation of individual values of all variables included in the study exhibited heterogeneity in cognitive alterations in the multiple sclerosis participants.
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Affiliation(s)
- Manuel Vázquez-Marrufo
- Experimental Psychology Department, Faculty of Psychology, University of Seville, Spain
- * E-mail:
| | | | - Rocio Caballero-Díaz
- Experimental Psychology Department, Faculty of Psychology, University of Seville, Spain
| | - Monica Borges
- Multiple Sclerosis Unit, Virgen Macarena Hospital, Seville, Spain
| | | | - Maria Luisa Benítez-Lugo
- Physiotherapy Department, Faculty of Nursing, Physiotherapy and Chiropody, Universidad de Sevilla, Sevilla, Spain
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8
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Radecki DZ, Johnson EL, Brown AK, Meshkin NT, Perrine SA, Gow A. Corticohippocampal Dysfunction In The OBiden Mouse Model Of Primary Oligodendrogliopathy. Sci Rep 2018; 8:16116. [PMID: 30382234 PMCID: PMC6208344 DOI: 10.1038/s41598-018-34414-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 09/25/2018] [Indexed: 12/18/2022] Open
Abstract
Despite concerted efforts over decades, the etiology of multiple sclerosis (MS) remains unclear. Autoimmunity, environmental-challenges, molecular mimicry and viral hypotheses have proven equivocal because early-stage disease is typically presymptomatic. Indeed, most animal models of MS also lack defined etiologies. We have developed a novel adult-onset oligodendrogliopathy using a delineated metabolic stress etiology in myelinating cells, and our central question is, “how much of the pathobiology of MS can be recapitulated in this model?” The analyses described herein demonstrate that innate immune activation, glial scarring, cortical and hippocampal damage with accompanying electrophysiological, behavioral and memory deficits naturally emerge from disease progression. Molecular analyses reveal neurofilament changes in normal-appearing gray matter that parallel those in cortical samples from MS patients with progressive disease. Finally, axon initial segments of deep layer pyramidal neurons are perturbed in entorhinal/frontal cortex and hippocampus from OBiden mice, and computational modeling provides insight into vulnerabilities of action potential generation during demyelination and early remyelination. We integrate these findings into a working model of corticohippocampal circuit dysfunction to predict how myelin damage might eventually lead to cognitive decline.
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Affiliation(s)
- Daniel Z Radecki
- Center for Molecular Medicine and Genetics, School of Medicine, Wayne State University, Detroit, MI, 48201, USA.,Department of Comparative Biosciences, University of Wisconsin-Madison School of Veterinary Medicine, Madison, WI, 53706, USA
| | - Elizabeth L Johnson
- Institute of Gerontology, Wayne State University, Detroit, MI, 48202, USA.,Helen Wills Neuroscience Institute, University of California, Berkeley, CA, 94720, USA
| | - Ashley K Brown
- Center for Molecular Medicine and Genetics, School of Medicine, Wayne State University, Detroit, MI, 48201, USA
| | - Nicholas T Meshkin
- Center for Molecular Medicine and Genetics, School of Medicine, Wayne State University, Detroit, MI, 48201, USA.,Department of Psychiatry and Behavioral Neurosciences, School of Medicine, Wayne State University, Detroit, MI, 48201, USA
| | - Shane A Perrine
- Department of Psychiatry and Behavioral Neurosciences, School of Medicine, Wayne State University, Detroit, MI, 48201, USA
| | - Alexander Gow
- Center for Molecular Medicine and Genetics, School of Medicine, Wayne State University, Detroit, MI, 48201, USA. .,Carman and Ann Adams Department of Pediatrics, School of Medicine, Wayne State University, Detroit, MI, 48201, USA. .,Department of Neurology, School of Medicine, Wayne State University, Detroit, MI, 48201, USA.
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Machine Learning EEG to Predict Cognitive Functioning and Processing Speed Over a 2-Year Period in Multiple Sclerosis Patients and Controls. Brain Topogr 2018; 31:346-363. [PMID: 29380079 DOI: 10.1007/s10548-018-0620-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Accepted: 01/15/2018] [Indexed: 12/29/2022]
Abstract
Event-related potentials (ERPs) show promise to be objective indicators of cognitive functioning. The aim of the study was to examine if ERPs recorded during an oddball task would predict cognitive functioning and information processing speed in Multiple Sclerosis (MS) patients and controls at the individual level. Seventy-eight participants (35 MS patients, 43 healthy age-matched controls) completed visual and auditory 2- and 3-stimulus oddball tasks with 128-channel EEG, and a neuropsychological battery, at baseline (month 0) and at Months 13 and 26. ERPs from 0 to 700 ms and across the whole scalp were transformed into 1728 individual spatio-temporal datapoints per participant. A machine learning method that included penalized linear regression used the entire spatio-temporal ERP to predict composite scores of both cognitive functioning and processing speed at baseline (month 0), and months 13 and 26. The results showed ERPs during the visual oddball tasks could predict cognitive functioning and information processing speed at baseline and a year later in a sample of MS patients and healthy controls. In contrast, ERPs during auditory tasks were not predictive of cognitive performance. These objective neurophysiological indicators of cognitive functioning and processing speed, and machine learning methods that can interrogate high-dimensional data, show promise in outcome prediction.
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Kepinska O, Pereda E, Caspers J, Schiller NO. Neural oscillatory mechanisms during novel grammar learning underlying language analytical abilities. BRAIN AND LANGUAGE 2017; 175:99-110. [PMID: 29059544 DOI: 10.1016/j.bandl.2017.10.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 07/14/2017] [Accepted: 10/09/2017] [Indexed: 06/07/2023]
Abstract
The goal of the present study was to investigate the initial phases of novel grammar learning on a neural level, concentrating on mechanisms responsible for individual variability between learners. Two groups of participants, one with high and one with average language analytical abilities, performed an Artificial Grammar Learning (AGL) task consisting of learning and test phases. During the task, EEG signals from 32 cap-mounted electrodes were recorded and epochs corresponding to the learning phases were analysed. We investigated spectral power modulations over time, and functional connectivity patterns by means of a bivariate, frequency-specific index of phase synchronization termed Phase Locking Value (PLV). Behavioural data showed learning effects in both groups, with a steeper learning curve and higher ultimate attainment for the highly skilled learners. Moreover, we established that cortical connectivity patterns and profiles of spectral power modulations over time differentiated L2 learners with various levels of language analytical abilities. Over the course of the task, the learning process seemed to be driven by whole-brain functional connectivity between neuronal assemblies achieved by means of communication in the beta band frequency. On a shorter time-scale, increasing proficiency on the AGL task appeared to be supported by stronger local synchronisation within the right hemisphere regions. Finally, we observed that the highly skilled learners might have exerted less mental effort, or reduced attention for the task at hand once the learning was achieved, as evidenced by the higher alpha band power.
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Affiliation(s)
- Olga Kepinska
- Leiden University Centre for Linguistics, Postbus 9515, 2300 RA Leiden, The Netherlands; Leiden Institute for Brain and Cognition, c/o LUMC, Postzone C2-S, P.O. Box 9600, 2300 RC Leiden, The Netherlands.
| | - Ernesto Pereda
- Electrical Engineering and Bioengineering Group, Dept. of Industrial Engineering & Instituto Universitario de Neurociencias, Universidad de La Laguna, Tenerife, Spain; Laboratory of Cognitive and Computational Neuroscience, Centre of Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain
| | - Johanneke Caspers
- Leiden University Centre for Linguistics, Postbus 9515, 2300 RA Leiden, The Netherlands; Leiden Institute for Brain and Cognition, c/o LUMC, Postzone C2-S, P.O. Box 9600, 2300 RC Leiden, The Netherlands
| | - Niels O Schiller
- Leiden University Centre for Linguistics, Postbus 9515, 2300 RA Leiden, The Netherlands; Leiden Institute for Brain and Cognition, c/o LUMC, Postzone C2-S, P.O. Box 9600, 2300 RC Leiden, The Netherlands
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11
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Kiiski HSM, Ní Riada S, Lalor EC, Gonçalves NR, Nolan H, Whelan R, Lonergan R, Kelly S, O'Brien MC, Kinsella K, Bramham J, Burke T, Ó Donnchadha S, Hutchinson M, Tubridy N, Reilly RB. Delayed P100-Like Latencies in Multiple Sclerosis: A Preliminary Investigation Using Visual Evoked Spread Spectrum Analysis. PLoS One 2016; 11:e0146084. [PMID: 26726800 PMCID: PMC4699709 DOI: 10.1371/journal.pone.0146084] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 12/11/2015] [Indexed: 01/21/2023] Open
Abstract
Conduction along the optic nerve is often slowed in multiple sclerosis (MS). This is typically assessed by measuring the latency of the P100 component of the Visual Evoked Potential (VEP) using electroencephalography. The Visual Evoked Spread Spectrum Analysis (VESPA) method, which involves modulating the contrast of a continuous visual stimulus over time, can produce a visually evoked response analogous to the P100 but with a higher signal-to-noise ratio and potentially higher sensitivity to individual differences in comparison to the VEP. The main objective of the study was to conduct a preliminary investigation into the utility of the VESPA method for probing and monitoring visual dysfunction in multiple sclerosis. The latencies and amplitudes of the P100-like VESPA component were compared between healthy controls and multiple sclerosis patients, and multiple sclerosis subgroups. The P100-like VESPA component activations were examined at baseline and over a 3-year period. The study included 43 multiple sclerosis patients (23 relapsing-remitting MS, 20 secondary-progressive MS) and 42 healthy controls who completed the VESPA at baseline. The follow-up sessions were conducted 12 months after baseline with 24 MS patients (15 relapsing-remitting MS, 9 secondary-progressive MS) and 23 controls, and again at 24 months post-baseline with 19 MS patients (13 relapsing-remitting MS, 6 secondary-progressive MS) and 14 controls. The results showed P100-like VESPA latencies to be delayed in multiple sclerosis compared to healthy controls over the 24-month period. Secondary-progressive MS patients had most pronounced delay in P100-like VESPA latency relative to relapsing-remitting MS and controls. There were no longitudinal P100-like VESPA response differences. These findings suggest that the VESPA method is a reproducible electrophysiological method that may have potential utility in the assessment of visual dysfunction in multiple sclerosis.
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Affiliation(s)
- Hanni S. M. Kiiski
- Neural Engineering Group, Trinity Centre for Bioengineering, Trinity College Dublin, Dublin, Ireland
- School of Engineering, Trinity College Dublin, Dublin, Ireland
- * E-mail:
| | - Sinéad Ní Riada
- Neural Engineering Group, Trinity Centre for Bioengineering, Trinity College Dublin, Dublin, Ireland
- School of Engineering, Trinity College Dublin, Dublin, Ireland
| | - Edmund C. Lalor
- Neural Engineering Group, Trinity Centre for Bioengineering, Trinity College Dublin, Dublin, Ireland
- School of Engineering, Trinity College Dublin, Dublin, Ireland
| | - Nuno R. Gonçalves
- Neural Engineering Group, Trinity Centre for Bioengineering, Trinity College Dublin, Dublin, Ireland
- School of Engineering, Trinity College Dublin, Dublin, Ireland
| | - Hugh Nolan
- Neural Engineering Group, Trinity Centre for Bioengineering, Trinity College Dublin, Dublin, Ireland
- School of Engineering, Trinity College Dublin, Dublin, Ireland
| | - Robert Whelan
- Neural Engineering Group, Trinity Centre for Bioengineering, Trinity College Dublin, Dublin, Ireland
- Cognitive and Behavioural Neuroscience Research Group, School of Psychology, UCD College of Human Sciences, University College Dublin, Dublin, Ireland
| | - Róisín Lonergan
- Department of Neurology, St. Vincent’s University Hospital, Dublin, Ireland
| | - Siobhán Kelly
- Department of Neurology, St. Vincent’s University Hospital, Dublin, Ireland
| | - Marie Claire O'Brien
- Cognitive and Behavioural Neuroscience Research Group, School of Psychology, UCD College of Human Sciences, University College Dublin, Dublin, Ireland
| | - Katie Kinsella
- Department of Neurology, St. Vincent’s University Hospital, Dublin, Ireland
| | - Jessica Bramham
- Cognitive and Behavioural Neuroscience Research Group, School of Psychology, UCD College of Human Sciences, University College Dublin, Dublin, Ireland
| | - Teresa Burke
- Cognitive and Behavioural Neuroscience Research Group, School of Psychology, UCD College of Human Sciences, University College Dublin, Dublin, Ireland
- School of Nursing and Human Sciences, Dublin City University, Dublin, Ireland
| | - Seán Ó Donnchadha
- Cognitive and Behavioural Neuroscience Research Group, School of Psychology, UCD College of Human Sciences, University College Dublin, Dublin, Ireland
| | - Michael Hutchinson
- Department of Neurology, St. Vincent’s University Hospital, Dublin, Ireland
| | - Niall Tubridy
- Department of Neurology, St. Vincent’s University Hospital, Dublin, Ireland
| | - Richard B. Reilly
- Neural Engineering Group, Trinity Centre for Bioengineering, Trinity College Dublin, Dublin, Ireland
- School of Engineering, Trinity College Dublin, Dublin, Ireland
- School of Medicine, Trinity College Dublin, Dublin, Ireland
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12
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Zhao C, Valentini E, Hu L. Functional features of crossmodal mismatch responses. Exp Brain Res 2014; 233:617-29. [DOI: 10.1007/s00221-014-4141-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Accepted: 11/02/2014] [Indexed: 11/25/2022]
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13
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Aniyan AK, Philip NS, Samar VJ, Desjardins JA, Segalowitz SJ. A wavelet based algorithm for the identification of oscillatory event-related potential components. J Neurosci Methods 2014; 233:63-72. [PMID: 24931710 DOI: 10.1016/j.jneumeth.2014.06.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 06/03/2014] [Accepted: 06/04/2014] [Indexed: 11/20/2022]
Abstract
Event related potentials (ERPs) are very feeble alterations in the ongoing electroencephalogram (EEG) and their detection is a challenging problem. Based on the unique time-based parameters derived from wavelet coefficients and the asymmetry property of wavelets a novel algorithm to separate ERP components in single-trial EEG data is described. Though illustrated as a specific application to N170 ERP detection, the algorithm is a generalized approach that can be easily adapted to isolate different kinds of ERP components. The algorithm detected the N170 ERP component with a high level of accuracy. We demonstrate that the asymmetry method is more accurate than the matching wavelet algorithm and t-CWT method by 48.67 and 8.03 percent, respectively. This paper provides an off-line demonstration of the algorithm and considers issues related to the extension of the algorithm to real-time applications.
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Affiliation(s)
| | | | - Vincent J Samar
- Rochester Institute of Technology, 52 Lomb Memorial Drive, Rochester, NY 14623, USA.
| | - James A Desjardins
- Brock University, 500 Glenridge Avenue, St. Catharines, ON L2S 3A1, Canada.
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14
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Van Schependom J, Gielen J, Laton J, D'hooghe MB, De Keyser J, Nagels G. Graph theoretical analysis indicates cognitive impairment in MS stems from neural disconnection. Neuroimage Clin 2014; 4:403-10. [PMID: 24567912 PMCID: PMC3930112 DOI: 10.1016/j.nicl.2014.01.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 01/14/2014] [Accepted: 01/22/2014] [Indexed: 01/31/2023]
Abstract
BACKGROUND The mechanisms underlying cognitive impairment in MS are still poorly understood. However, due to the specific pathology of MS, one can expect alterations in connectivity leading to physical and cognitive impairment. AIM In this study we aimed at assessing connectivity differences in EEG between cognitively impaired (CI) and cognitively preserved (CP) MS patients. We also investigated the influence of the measures used to construct networks. METHODS We included 308 MS patients and divided them into two groups based on their cognitive score. Graph theoretical network analyses were conducted based on networks constructed using different connectivity measures, i.e. correlation, correlation in the frequency domain, coherence, partial correlation, the phase lag index and the imaginary part of coherency. The most commonly encountered network parameters were calculated and compared between the two groups using Wilcoxon's rank test. Clustering coefficients and path lengths were normalized to a randomized mean clustering coefficient and path length for each patient. False discovery rate was used to correct for the multiple comparisons and Cohen's d effect sizes are reported. RESULTS Coherence analysis suggests that theta and delta connectivity is significantly smaller in cognitively impaired patients. Small-worldness differences are found in networks based on correlation, theta and delta coherence and correlation in the frequency domain. Modularity was related to age but not to cognition. CONCLUSION Cognitive deterioration in MS is a symptom that seems to be caused by neural disconnections, probably the white matter tracts connecting both hemispheres, and leads to a wide range in network differences which can be assessed by applying GTA to EEG data. In the future, these results may lead to cheaper and more objective assessments of cognitive impairment in MS.
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Affiliation(s)
- Jeroen Van Schependom
- UZ Brussel, Vrije Universiteit Brussel, Center for Neurosciences, Laarbeeklaan 101, 1090 Brussels, Belgium
- Faculté de Psychologie et des Sciences de l'Education, Place du parc 20, 7000 Mons, Belgium
| | - Jeroen Gielen
- UZ Brussel, Vrije Universiteit Brussel, Center for Neurosciences, Laarbeeklaan 101, 1090 Brussels, Belgium
| | - Jorne Laton
- UZ Brussel, Vrije Universiteit Brussel, Center for Neurosciences, Laarbeeklaan 101, 1090 Brussels, Belgium
| | - Marie B. D'hooghe
- UZ Brussel, Vrije Universiteit Brussel, Center for Neurosciences, Laarbeeklaan 101, 1090 Brussels, Belgium
- National MS Center Melsbroek, Vanheylenstraat 16, 1820 Melsbroek, Belgium
| | - Jacques De Keyser
- National MS Center Melsbroek, Vanheylenstraat 16, 1820 Melsbroek, Belgium
| | - Guy Nagels
- UZ Brussel, Vrije Universiteit Brussel, Center for Neurosciences, Laarbeeklaan 101, 1090 Brussels, Belgium
- National MS Center Melsbroek, Vanheylenstraat 16, 1820 Melsbroek, Belgium
- Faculté de Psychologie et des Sciences de l'Education, Place du parc 20, 7000 Mons, Belgium
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15
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Identifying patients with poststroke mild cognitive impairment by pattern recognition of working memory load-related ERP. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2013; 2013:658501. [PMID: 24233152 PMCID: PMC3819888 DOI: 10.1155/2013/658501] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 08/31/2013] [Accepted: 09/05/2013] [Indexed: 12/02/2022]
Abstract
The early detection of subjects with probable cognitive deficits is crucial for effective appliance of treatment strategies. This paper explored a methodology used to discriminate between evoked related potential signals of stroke patients and their matched control subjects in a visual working memory paradigm. The proposed algorithm, which combined independent component analysis and orthogonal empirical mode decomposition, was applied to extract independent sources. Four types of target stimulus features including P300 peak latency, P300 peak amplitude, root mean square, and theta frequency band power were chosen. Evolutionary multiple kernel support vector machine (EMK-SVM) based on genetic programming was investigated to classify stroke patients and healthy controls. Based on 5-fold cross-validation runs, EMK-SVM provided better classification performance compared with other state-of-the-art algorithms. Comparing stroke patients with healthy controls using the proposed algorithm, we achieved the maximum classification accuracies of 91.76% and 82.23% for 0-back and 1-back tasks, respectively. Overall, the experimental results showed that the proposed method was effective. The approach in this study may eventually lead to a reliable tool for identifying suitable brain impairment candidates and assessing cognitive function.
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