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Cruciani A, Capone F, Haggiag S, Prosperini L, Santoro F, Ruggieri S, Motolese F, Pilato F, Musumeci G, Pozzilli V, Rossi M, Stampanoni Bassi M, Buttari F, Centonze D, Di Lazzaro V, Gasperini C, Tortorella C. Cortical plasticity in AQP4-positive NMOSD: a transcranial magnetic stimulation study. Cereb Cortex 2024; 34:bhae345. [PMID: 39172095 DOI: 10.1093/cercor/bhae345] [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: 03/28/2024] [Revised: 07/31/2024] [Accepted: 08/07/2024] [Indexed: 08/23/2024] Open
Abstract
Aquaporin-4 antibody-positive neuromyelitis optica spectrum disorder (AQP4-NMOSD) is an autoimmune disease characterized by suboptimal recovery from attacks and long-term disability. Experimental data suggest that AQP4 antibodies can disrupt neuroplasticity, a fundamental driver of brain recovery. A well-established method to assess brain LTP is through intermittent theta-burst stimulation (iTBS). This study aimed to explore neuroplasticity in AQP4-NMOSD patients by examining long-term potentiation (LTP) through iTBS. We conducted a proof-of-principle study including 8 patients with AQP4-NMOSD, 8 patients with multiple sclerosis (MS), and 8 healthy controls (HC) in which iTBS was administered to induce LTP-like effects. iTBS-induced LTP exhibited significant differences among the 3 groups (p: 0.006). Notably, AQP4-NMOSD patients demonstrated impaired plasticity compared to both HC (p = 0.01) and pwMS (p = 0.02). This pilot study provides the first in vivo evidence supporting impaired neuroplasticity in AQP4-NMOSD patients. Impaired cortical plasticity may hinder recovery following attacks suggesting a need for targeted rehabilitation strategies.
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Affiliation(s)
- Alessandro Cruciani
- Department of Medicine and Surgery, Unit of Neurology, Neurophysiology, Neurobiology, and Psychiatry, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21-00128, Roma, Italy
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 21-00128 Roma, Italy
| | - Fioravante Capone
- Department of Medicine and Surgery, Unit of Neurology, Neurophysiology, Neurobiology, and Psychiatry, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21-00128, Roma, Italy
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 21-00128 Roma, Italy
| | - Shalom Haggiag
- Department of Neurosciences, San Camillo-Forlanini Hospital, C.ne Gianicolense 87, , 00152 Rome, Italy
| | - Luca Prosperini
- Department of Neurosciences, San Camillo-Forlanini Hospital, C.ne Gianicolense 87, , 00152 Rome, Italy
| | - Francesca Santoro
- Department of Medicine and Surgery, Unit of Neurology, Neurophysiology, Neurobiology, and Psychiatry, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21-00128, Roma, Italy
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 21-00128 Roma, Italy
| | - Serena Ruggieri
- Department of Neurosciences, San Camillo-Forlanini Hospital, C.ne Gianicolense 87, , 00152 Rome, Italy
| | - Francesco Motolese
- Department of Medicine and Surgery, Unit of Neurology, Neurophysiology, Neurobiology, and Psychiatry, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21-00128, Roma, Italy
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 21-00128 Roma, Italy
| | - Fabio Pilato
- Department of Medicine and Surgery, Unit of Neurology, Neurophysiology, Neurobiology, and Psychiatry, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21-00128, Roma, Italy
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 21-00128 Roma, Italy
| | - Gabriella Musumeci
- Department of Medicine and Surgery, Unit of Neurology, Neurophysiology, Neurobiology, and Psychiatry, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21-00128, Roma, Italy
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 21-00128 Roma, Italy
| | - Valeria Pozzilli
- Department of Medicine and Surgery, Unit of Neurology, Neurophysiology, Neurobiology, and Psychiatry, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21-00128, Roma, Italy
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 21-00128 Roma, Italy
| | - Mariagrazia Rossi
- Department of Medicine and Surgery, Unit of Neurology, Neurophysiology, Neurobiology, and Psychiatry, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21-00128, Roma, Italy
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 21-00128 Roma, Italy
| | | | - Fabio Buttari
- Unit of Neurology, IRCCS Neuromed, Pozzilli (IS), Italy
- Laboratory of Synaptic Immunopathology, Department of Systems Medicine, University of Tor Vergata, Rome, Italy
| | - Diego Centonze
- Unit of Neurology, IRCCS Neuromed, Pozzilli (IS), Italy
- Laboratory of Synaptic Immunopathology, Department of Systems Medicine, University of Tor Vergata, Rome, Italy
| | - Vincenzo Di Lazzaro
- Department of Medicine and Surgery, Unit of Neurology, Neurophysiology, Neurobiology, and Psychiatry, Università Campus Bio-Medico di Roma, Via Alvaro del Portillo 21-00128, Roma, Italy
- Fondazione Policlinico Universitario Campus Bio-Medico, Via Alvaro del Portillo, 21-00128 Roma, Italy
| | - Claudio Gasperini
- Department of Neurosciences, San Camillo-Forlanini Hospital, C.ne Gianicolense 87, , 00152 Rome, Italy
| | - Carla Tortorella
- Department of Neurosciences, San Camillo-Forlanini Hospital, C.ne Gianicolense 87, , 00152 Rome, Italy
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Elkhooly M, Di Stadio A, Bernitsas E. Effect of Aerobic Exercise versus Non-Invasive Brain Stimulation on Cognitive Function in Multiple Sclerosis: A Systematic Review and Meta-Analysis. Brain Sci 2024; 14:771. [PMID: 39199465 PMCID: PMC11352410 DOI: 10.3390/brainsci14080771] [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: 06/29/2024] [Revised: 07/23/2024] [Accepted: 07/29/2024] [Indexed: 09/01/2024] Open
Abstract
OBJECTIVE In this study, we investigated the effects of noninvasive brain stimulation (NIBS) and exercise on cognition in patients with multiple sclerosis (pwMS). METHODS A literature search was performed using the Cochrane Library, Scopus, PubMed and Web of Science. The time interval used for database construction was up to February 2024; the collected trials were subsequently screened, and the data were extracted. RESULTS We identified 12 studies with 208 pwMS treated with noninvasive brain stimulation. Seven of the twelve studies concluded that NIBS was effective in improving reaction time, attention and processing speed. Additionally, 26 articles investigated the effect of various types of exercise on cognition among 708 pwMS. Twelve studies used aerobic exercise only, three studies used resistance only, one used yoga, and ten studies used mixed forms of exercise, such as Pilates, resistance and Frenkel coordination. Aerobic exercise was effective in improving at least one cognitive domain in ten studies. Resistance exercise was found to improve cognition in three studies. Yoga failed to show any improvement in one study. CONCLUSIONS NIBS might be an effective intervention for cognition improvement among pwMS. Aerobic exercise and combined forms of exercise are the most frequently investigated and applied and found to be effective. Further studies are needed, especially for resistance, balance and stretching exercises.
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Affiliation(s)
- Mahmoud Elkhooly
- Department of Neurology, Southern Illinois University School of Medicine, Springfield, IL 62702, USA;
| | - Arianna Di Stadio
- Department of GF Ingrassia, University of Catania, 95121 Catania, Italy
- IRCSS Santa Lucia, 00179 Rome, Italy
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Li S, Zhang Q, Zheng S, Li G, Li S, He L, Zeng Y, Chen L, Chen S, Zheng X, Zou J, Zeng Q. Efficacy of non-invasive brain stimulation on cognitive and motor functions in multiple sclerosis: A systematic review and meta-analysis. Front Neurol 2023; 14:1091252. [PMID: 36779055 PMCID: PMC9911042 DOI: 10.3389/fneur.2023.1091252] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Accepted: 01/10/2023] [Indexed: 01/27/2023] Open
Abstract
Objective In this study, we aimed to investigate the effects of non-invasive brain stimulation (NIBS) on cognitive and motor functions in patients with multiple sclerosis (pwMS). Methods A literature search was performed in the Cochrane Library, Embase, PubMed, Web of Science, Medline, CNKI, and Wan fang. The time interval used for database construction was up to December 2022, and the language was not limited. The collected trials were subsequently screened, the data were extracted, the quality was evaluated, and the effect sizes were computed using STATA/MP Version 13 for outcome analysis. Standard mean difference (SMD) and 95% confidence interval (CI) were calculated for domain of interest. Results In total, 17 articles that examined 364 patients with multiple sclerosis were included in this analysis. Non-invasive brain stimulation did not improve the overall cognitive function [SMD = 0.18, 95% CI (-0.32, 0.69), P = 0.475] but helped improve motor function in patients [SMD = 0.52, 95% CI (0.19, 0.85), P = 0.002]. Moreover, this study specifically indicated that non-invasive brain stimulation improved alerting [SMD = 0.68, 95% CI (0.09, 1.26), P = 0.02], whereas non-invasive brain stimulation intervention improved motor function in patients aged <45 years [SMD = 0.67, 95% CI (0.23, 1.10), P = 0.003] and in patients with expanded disability status scale scores (EDSS) <3.5 [SMD = 0.82, 95% CI (0.22, 1.42), P = 0.007]. In particular, NIBS contributed to the improvement of spasticity in pwMS [SMD = 0.68, 95% CI (0.13, 1.23), P = 0.015]. Conclusion These results of this present study provide evidence that non-invasive brain stimulation could improve alertness in pwMS. Furthermore, NIBS may help pwMS with motor function and those who are under 45 years of age or with EDSS < 3.5 improve their motor function. For the therapeutic use of NIBS, we recommend applying transcranial magnetic stimulation as an intervention and located on the motor cortex M1 according to the subgroup analysis of motor function. These findings warrant verification. Systematic review registration https://www.crd.york.ac.uk/PROSPERO/, identifier CRD42022301012.
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Affiliation(s)
- Shuiyan Li
- School of Rehabilitation Sciences, Southern Medical University, Guangzhou, China
- Department of Rehabilitation Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Qi Zhang
- School of Rehabilitation Sciences, Southern Medical University, Guangzhou, China
- Department of Rehabilitation Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Shuqi Zheng
- School of Rehabilitation Sciences, Southern Medical University, Guangzhou, China
- Department of Rehabilitation Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Gege Li
- School of Rehabilitation Sciences, Southern Medical University, Guangzhou, China
- Department of Rehabilitation Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Shilin Li
- School of Rehabilitation Sciences, Southern Medical University, Guangzhou, China
- Department of Rehabilitation Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Longlong He
- School of Rehabilitation Sciences, Southern Medical University, Guangzhou, China
- Department of Rehabilitation Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Yuting Zeng
- Department of Rehabilitation Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Ling Chen
- Department of Rehabilitation Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Shuping Chen
- School of Rehabilitation Sciences, Southern Medical University, Guangzhou, China
- Department of Rehabilitation Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Xiaoyan Zheng
- School of Rehabilitation Sciences, Southern Medical University, Guangzhou, China
| | - Jihua Zou
- School of Rehabilitation Sciences, Southern Medical University, Guangzhou, China
- Department of Rehabilitation Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Faculty of Health and Social Sciences, The Hong Kong Polytechnic University, Hong Kong, China
| | - Qing Zeng
- School of Rehabilitation Sciences, Southern Medical University, Guangzhou, China
- Department of Rehabilitation Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, China
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Zhou X, Li K, Chen S, Zhou W, Li J, Huang Q, Xu T, Gao Z, Wang D, Zhao S, Dong H. Clinical application of transcranial magnetic stimulation in multiple sclerosis. Front Immunol 2022; 13:902658. [PMID: 36131925 PMCID: PMC9483183 DOI: 10.3389/fimmu.2022.902658] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 08/05/2022] [Indexed: 12/04/2022] Open
Abstract
Multiple sclerosis (MS) is a common chronic, autoimmune-mediated inflammatory and neurodegenerative disease of the central nervous system. The treatment of MS has enormous progress with disease-modifying drugs, but the complexity of the disease course and the clinical symptoms of MS requires personalized treatment and disease management, including non-pharmacological treatment. Transcranial magnetic stimulation (TMS) is a painless and non-invasive brain stimulation technique, which has been widely used in neurological diseases. In this review, we mainly focus on the progress of physiological assessment and treatment of TMS in MS.
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Affiliation(s)
- Xiaoliang Zhou
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Kailin Li
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
- Xiangya School of Medicine, Central South University, Changsha, China
| | - Si Chen
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Wenbin Zhou
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Jing Li
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Qing Huang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
| | - Tingting Xu
- Xiangya School of Medicine, Central South University, Changsha, China
| | - Zhiyuan Gao
- Xiangya School of Medicine, Central South University, Changsha, China
| | - Dongyu Wang
- Xiangya School of Medicine, Central South University, Changsha, China
| | - Shuo Zhao
- Xiangya School of Medicine, Central South University, Changsha, China
| | - Hao Dong
- Xiangya School of Medicine, Central South University, Changsha, China
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Balloff C, Penner IK, Ma M, Georgiades I, Scala L, Troullinakis N, Graf J, Kremer D, Aktas O, Hartung HP, Meuth SG, Schnitzler A, Groiss SJ, Albrecht P. The degree of cortical plasticity correlates with cognitive performance in patients with Multiple Sclerosis. Brain Stimul 2022; 15:403-413. [PMID: 35182811 DOI: 10.1016/j.brs.2022.02.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 02/14/2022] [Accepted: 02/14/2022] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Cortical reorganization and plasticity may compensate for structural damage in Multiple Sclerosis (MS). It is important to establish sensitive methods to measure these compensatory mechanisms, as they may be of prognostic value. OBJECTIVE To investigate the association between the degree of cortical plasticity and cognitive performance and to compare plasticity between MS patients and healthy controls (HCs). METHODS The amplitudes of the motor evoked potential (MEP) pre and post quadripulse stimulation (QPS) applied over the contralateral motor cortex served as measure of the degree of cortical plasticity in 63 patients with relapsing-remitting MS (RRMS) and 55 matched HCs. The main outcomes were the correlation coefficients between the difference of MEP amplitudes post and pre QPS and the Symbol Digit Modalities Test (SDMT) and Brief Visuospatial Memory Test-Revised (BVMT-R), and the QPSxgroup interaction in a mixed model predicting the MEP amplitude. RESULTS SDMT and BVMT-R correlated significantly with QPS-induced cortical plasticity in RRMS patients. Plasticity was significantly reduced in patients with cognitive impairment compared to patients with preserved cognitive function and the degree of plasticity differentiated between both patient groups. Interestingly, the overall RRMS patient cohort did not show reduced plasticity compared to HCs. CONCLUSIONS We provide first evidence that QPS-induced plasticity may inform about the global synaptic plasticity in RRMS which correlates with cognitive performance as well as clinical disability. Larger longitudinal studies on patients with MS are needed to investigate the relevance and prognostic value of this measure for disease progression and recovery.
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Affiliation(s)
- Carolin Balloff
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany; Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Iris-Katharina Penner
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany; Cogito Center for Applied Neurocognition and Neuropsychological Research, 40225, Düsseldorf, Germany; Department of Neurology, Inselspital, University Hospital Bern, 3010, Bern, Switzerland
| | - Meng Ma
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Iason Georgiades
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Lina Scala
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Nina Troullinakis
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Jonas Graf
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - David Kremer
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Orhan Aktas
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Hans-Peter Hartung
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany; Brain and Mind Center, University of Sydney, NSW, 2006, Australia; Department of Neurology, Medical University of Vienna, 1090, Vienna, Austria
| | - Sven Günther Meuth
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Alfons Schnitzler
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany; Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
| | - Stefan Jun Groiss
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany; Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany.
| | - Philipp Albrecht
- Department of Neurology, Medical Faculty, Heinrich-Heine University, 40225, Duesseldorf, Germany
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Synaptic metaplasticity for image processing enhancement in convolutional neural networks. Neurocomputing 2021. [DOI: 10.1016/j.neucom.2021.08.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Cortical mechanisms underlying variability in intermittent theta-burst stimulation-induced plasticity: A TMS-EEG study. Clin Neurophysiol 2021; 132:2519-2531. [PMID: 34454281 DOI: 10.1016/j.clinph.2021.06.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 06/10/2021] [Accepted: 06/22/2021] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To test the hypothesis that intermittent theta burst stimulation (iTBS) variability depends on the ability to engage specific neurons in the primary motor cortex (M1). METHODS In a sham-controlled interventional study on 31 healthy volunteers, we used concomitant transcranial magnetic stimulation (TMS) and electroencephalography (EEG). We compared baseline motor evoked potentials (MEPs), M1 iTBS-evoked EEG oscillations, and resting-state EEG (rsEEG) between subjects who did and did not show MEP facilitation following iTBS. We also investigated whether baseline MEP and iTBS-evoked EEG oscillations could explain inter and intraindividual variability in iTBS aftereffects. RESULTS The facilitation group had smaller baseline MEPs than the no-facilitation group and showed more iTBS-evoked EEG oscillation synchronization in the alpha and beta frequency bands. Resting-state EEG power was similar between groups and iTBS had a similar non-significant effect on rsEEG in both groups. Baseline MEP amplitude and beta iTBS-evoked EEG oscillation power explained both inter and intraindividual variability in MEP modulation following iTBS. CONCLUSIONS The results show that variability in iTBS-associated plasticity depends on baseline corticospinal excitability and on the ability of iTBS to engage M1 beta oscillations. SIGNIFICANCE These observations can be used to optimize iTBS investigational and therapeutic applications.
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Vives-Boix V, Ruiz-Fernández D. Diabetic retinopathy detection through convolutional neural networks with synaptic metaplasticity. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2021; 206:106094. [PMID: 34010801 DOI: 10.1016/j.cmpb.2021.106094] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 04/02/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND AND OBJECTIVES Diabetic retinopathy is a type of diabetes that causes vascular changes that can lead to blindness. The ravages of this disease cannot be reversed, so early detection is essential. This work presents an automated method for early detection of this disease using fundus colored images. METHODS A bio-inspired approach is proposed on synaptic metaplasticity in convolutional neural networks. This biological phenomenon is known to directly interfere in both learning and memory by reinforcing less common occurrences during the learning process. Synaptic metaplasticity has been included in the backpropagation stage of a convolution operation for every convolutional layer. RESULTS The proposed method has been evaluated by using a public small diabetic retinopathy dataset from Kaggle with four award-winning convolutional neural network architectures. Results show that convolutional neural network architectures including synaptic metaplasticity improve both learning rate and accuracy. Furthermore, obtained results outperform other methods in current literature, even using smaller datasets for training. Best results have been obtained for the InceptionV3 architecture with synaptic metaplasticity with a 95.56% accuracy, 94.24% F1-score, 98.9% precision and 90% recall, using 3662 images for training. CONCLUSIONS Convolutional neural networks with synaptic metaplasticity are suitable for early detection of diabetic retinopathy due to their fast convergence rate, training simplicity and high performance.
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Affiliation(s)
- Víctor Vives-Boix
- Department of Computer Science and Technology, University of Alicante, Ctra. San Vicente del Raspeig s/n, 03690, San Vicente del Raspeig, Spain.
| | - Daniel Ruiz-Fernández
- Department of Computer Science and Technology, University of Alicante, Ctra. San Vicente del Raspeig s/n, 03690, San Vicente del Raspeig, Spain.
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Avchalumov Y, Mandyam CD. Plasticity in the Hippocampus, Neurogenesis and Drugs of Abuse. Brain Sci 2021; 11:404. [PMID: 33810204 PMCID: PMC8004884 DOI: 10.3390/brainsci11030404] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/05/2021] [Accepted: 03/11/2021] [Indexed: 02/07/2023] Open
Abstract
Synaptic plasticity in the hippocampus assists with consolidation and storage of long-lasting memories. Decades of research has provided substantial information on the cellular and molecular mechanisms underlying synaptic plasticity in the hippocampus, and this review discusses these mechanisms in brief. Addiction is a chronic relapsing disorder with loss of control over drug taking and drug seeking that is caused by long-lasting memories of drug experience. Relapse to drug use is caused by exposure to context and cues associated with the drug experience, and is a major clinical problem that contributes to the persistence of addiction. This review also briefly discusses some evidence that drugs of abuse alter plasticity in the hippocampus, and that development of novel treatment strategies that reverse or prevent drug-induced synaptic alterations in the hippocampus may reduce relapse behaviors associated with addiction.
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Affiliation(s)
| | - Chitra D. Mandyam
- VA San Diego Healthcare System, San Diego, CA 92161, USA;
- Department of Anesthesiology, University of California San Diego, San Diego, CA 92161, USA
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Ferrazzano G, Crisafulli SG, Baione V, Tartaglia M, Cortese A, Frontoni M, Altieri M, Pauri F, Millefiorini E, Conte A. Early diagnosis of secondary progressive multiple sclerosis: focus on fluid and neurophysiological biomarkers. J Neurol 2020; 268:3626-3645. [PMID: 32504180 DOI: 10.1007/s00415-020-09964-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 05/28/2020] [Accepted: 05/30/2020] [Indexed: 01/19/2023]
Abstract
BACKGROUND AND AIMS Most patients with multiple sclerosis presenting with a relapsing-remitting disease course at diagnosis transition to secondary progressive multiple sclerosis (SPMS) 1-2 decades after onset. SPMS is characterized by predominant neurodegeneration and atrophy. These pathogenic hallmarks result in unsatisfactory treatment response in SPMS patients. Therefore, early diagnosis of SPMS is necessary for prompt treatment decisions. The aim of this review was to assess neurophysiological and fluid biomarkers that have the potential to monitor disease progression and support early SPMS diagnosis. METHODS We performed a systematic review of studies that analyzed the role of neurophysiological techniques and fluid biomarkers in supporting SPMS diagnosis using the preferred reporting items for systematic reviews and meta-analyses statement. RESULTS From our initial search, we selected 24 relevant articles on neurophysiological biomarkers and 55 articles on fluid biomarkers. CONCLUSION To date, no neurophysiological or fluid biomarker is sufficiently validated to support the early diagnosis of SPMS. Neurophysiological measurements, including short interval intracortical inhibition and somatosensory temporal discrimination threshold, and the neurofilament light chain fluid biomarker seem to be the most promising. Cross-sectional studies on an adequate number of patients followed by longitudinal studies are needed to confirm the diagnostic and prognostic value of these biomarkers. A combination of neurophysiological and fluid biomarkers may be more sensitive in detecting SPMS conversion.
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Affiliation(s)
- Gina Ferrazzano
- Department of Human Neurosciences, Sapienza University of Rome, Rome, Italy
| | | | - Viola Baione
- Department of Human Neurosciences, Sapienza University of Rome, Rome, Italy
| | - Matteo Tartaglia
- Department of Human Neurosciences, Sapienza University of Rome, Rome, Italy
| | - Antonio Cortese
- Multiple Sclerosis Center, San Filippo Neri Hospital, Rome, Italy
| | - Marco Frontoni
- Department of Human Neurosciences, Sapienza University of Rome, Rome, Italy
| | - Marta Altieri
- Department of Human Neurosciences, Sapienza University of Rome, Rome, Italy
| | - Flavia Pauri
- Department of Human Neurosciences, Sapienza University of Rome, Rome, Italy
| | | | - Antonella Conte
- Department of Human Neurosciences, Sapienza University of Rome, Rome, Italy. .,IRCCS Neuromed, Pozzilli, IS, Italy.
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