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Dotov D, Cochen de Cock V, Driss V, Bardy B, Dalla Bella S. Coordination Rigidity in the Gait, Posture, and Speech of Persons with Parkinson's Disease. J Mot Behav 2023; 55:394-409. [PMID: 37257844 DOI: 10.1080/00222895.2023.2217100] [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: 12/27/2020] [Revised: 04/04/2023] [Accepted: 05/18/2023] [Indexed: 06/02/2023]
Abstract
Parkinson's disease (PD) is associated with reduced coordination abilities. These can result either in random or rigid patterns of movement. The latter, described here as coordination rigidity (CR), have been studied less often. We explored whether CR was present in gait, quiet stance, and speech-tasks involving coordination among multiple joints and muscles. Kinematic and voice recordings were used to compute measures describing the dynamics of systems with multiple degrees of freedom and nonlinear interactions. After clinical evaluation, patients with moderate stage PD were compared against matched healthy participants. In the PD group, gait dynamics was associated with decreased dynamic divergence-lower instability-in the vertical axis. Postural fluctuations were associated with increased regularity in the anterior-posterior axis, and voice dynamics with increased predictability, all consistent with CR. The clinical relevance of CR was confirmed by showing that some of those features contribute to disease classification with supervised machine learning (82/81/85% accuracy/sensitivity/specificity).
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Affiliation(s)
- Dobromir Dotov
- Psychology, Neuroscience and Behaviour, McMaster University, Hamilton, Canada
| | - Valérie Cochen de Cock
- Clinique Beau Soleil and CHU, Hôpital St Eloi, Montpellier, France
- EuroMov Digital Health in Motion, Université de Montpellier, Montpellier, France
| | - Valérie Driss
- Clinical Investigation Centre (CIC) 1411, University Hospital of Montpellier & Inserm, Montpellier, France
| | - Benoît Bardy
- EuroMov Digital Health in Motion, Université de Montpellier, Montpellier, France
- Institut Universitaire de France (IUF), Paris, France
| | - Simone Dalla Bella
- EuroMov Digital Health in Motion, Université de Montpellier, Montpellier, France
- International Laboratory for Brain, Music, and Sound Research (BRAMS) and Department of Psychology, University of Montreal, Montreal, Canada
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SHAH VRUTANGKUMARV, GOYAL SACHIN, PALANTHANDALAM-MADAPUSI HARISHJ. COMPARISON OF THEORIES OF REST TREMOR MECHANISM IN PARKINSON’S DISEASE: CENTRAL OSCILLATOR (SOURCE-TRIGGERED OSCILLATIONS) AND FEEDBACK-INDUCED INSTABILITY IN THE SENSORIMOTOR LOOP (SELF-SUSTAINED OSCILLATIONS). J MECH MED BIOL 2020. [DOI: 10.1142/s0219519419500751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Rest tremor is one of the most common and disabling symptoms of Parkinson’s disease (PD). The exact neural origin of rest tremor is still not clearly understood. Understanding the origin of rest tremor is important as it may aid in optimizing existing treatment strategies such as Deep Brain Stimulation or in developing new treatment strategies for rest tremor reduction. There are broadly two theories that are gaining prominence for rest tremor generation in PD. The first theory is the central oscillator theory that states that the rest tremor is triggered by an oscillatory source in the brain. The second theory is the feedback-induced instability theory that states that the rest tremor arises out of a feedback-induced instability in the sensorimotor loop. This paper analyzes validity of the two theories based on established clinical observations of Parkinsonian rest tremor by using representative simulation examples. Finally, based on our analysis, we propose two test-worthy experiments for further validation.
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Affiliation(s)
- VRUTANGKUMAR V. SHAH
- Balance Disorder Lab, Department of Neurology, Oregon Health and Science University, OR 97239, USA
- SysIDEA Lab, Mechanical Engineering, Indian Institute of Technology Gandhinagar, Gandhinagar, GJ-382355, India
| | - SACHIN GOYAL
- Department of Mechanical Engineering, Health Science Research Institute, University of California, Merced, CA-95343, USA
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Abstract
Neurostimulation as a therapeutic tool has been developed and used for a range of different diseases such as Parkinson's disease, epilepsy, and migraine. However, it is not known why the efficacy of the stimulation varies dramatically across patients or why some patients suffer from severe side effects. This is largely due to the lack of mechanistic understanding of neurostimulation. Hence, theoretical computational approaches to address this issue are in demand. This chapter provides a review of mechanistic computational modeling of brain stimulation. In particular, we will focus on brain diseases, where mechanistic models (e.g., neural population models or detailed neuronal models) have been used to bridge the gap between cellular-level processes of affected neural circuits and the symptomatic expression of disease dynamics. We show how such models have been, and can be, used to investigate the effects of neurostimulation in the diseased brain. We argue that these models are crucial for the mechanistic understanding of the effect of stimulation, allowing for a rational design of stimulation protocols. Based on mechanistic models, we argue that the development of closed-loop stimulation is essential in order to avoid inference with healthy ongoing brain activity. Furthermore, patient-specific data, such as neuroanatomic information and connectivity profiles obtainable from neuroimaging, can be readily incorporated to address the clinical issue of variability in efficacy between subjects. We conclude that mechanistic computational models can and should play a key role in the rational design of effective, fully integrated, patient-specific therapeutic brain stimulation.
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Modolo J, Legros A, Beuter A. The next move in neuromodulation therapy: a question of timing. Front Comput Neurosci 2015; 8:162. [PMID: 25762920 PMCID: PMC4327509 DOI: 10.3389/fncom.2014.00162] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 11/24/2014] [Indexed: 11/23/2022] Open
Affiliation(s)
- Julien Modolo
- Human Threshold Research Group, Lawson Health Research Institute London, ON, Canada ; Departments of Medical Biophysics and Medical Imaging, Western University London, ON, Canada
| | - Alexandre Legros
- Human Threshold Research Group, Lawson Health Research Institute London, ON, Canada ; Departments of Medical Biophysics and Medical Imaging, Western University London, ON, Canada ; School of Kinesiology, Western University London, ON, Canada
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Karamintziou SD, Tsirogiannis GL, Stathis PG, Tagaris GA, Boviatsis EJ, Sakas DE, Nikita KS. Supporting clinical decision making during deep brain stimulation surgery by means of a stochastic dynamical model. J Neural Eng 2014; 11:056019. [DOI: 10.1088/1741-2560/11/5/056019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Heumann R, Moratalla R, Herrero MT, Chakrabarty K, Drucker-Colín R, Garcia-Montes JR, Simola N, Morelli M. Dyskinesia in Parkinson's disease: mechanisms and current non-pharmacological interventions. J Neurochem 2014; 130:472-89. [DOI: 10.1111/jnc.12751] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Revised: 04/23/2014] [Accepted: 04/27/2014] [Indexed: 01/24/2023]
Affiliation(s)
- Rolf Heumann
- Molecular Neurobiochemistry; Ruhr-University Bochum; Bochum Germany
| | | | - Maria Trinidad Herrero
- Clinical & Experimental Neuroscience (NiCE-CIBERNED); School of Health Sciences; University Jaume I; Castelló, and School of Medicine; University of Murcia; Murcia Spain
| | | | - René Drucker-Colín
- Instituto de Fisiología Celular; Universidad Nacional Autónoma de México; Mexico City México
| | | | - Nicola Simola
- Department of Biomedical Sciences; Section of Neuropsychopharmacology; University of Cagliari; Cagliari Italy
| | - Micaela Morelli
- Department of Biomedical Sciences; Section of Neuropsychopharmacology; University of Cagliari; Cagliari Italy
- National Institute of Neuroscience (INN); University of Cagliari; Cagliari Italy
- National Research Council (CNR); Neuroscience Institute; Cagliari Italy
- Center of Excellence on Neurobiology of Dependence; University of Cagliari; Cagliari Italy
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Rowan MS, Neymotin SA, Lytton WW. Electrostimulation to reduce synaptic scaling driven progression of Alzheimer's disease. Front Comput Neurosci 2014; 8:39. [PMID: 24765074 PMCID: PMC3982056 DOI: 10.3389/fncom.2014.00039] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2013] [Accepted: 03/18/2014] [Indexed: 01/23/2023] Open
Abstract
Cell death and synapse dysfunction are two likely causes of cognitive decline in AD. As cells die and synapses lose their drive, remaining cells suffer an initial decrease in activity. Neuronal homeostatic synaptic scaling then provides a feedback mechanism to restore activity. This homeostatic mechanism is believed to sense levels of activity-dependent cytosolic calcium within the cell and to adjust neuronal firing activity by increasing the density of AMPA synapses at remaining synapses to achieve balance. The scaling mechanism increases the firing rates of remaining cells in the network to compensate for decreases in network activity. However, this effect can itself become a pathology, as it produces increased imbalance between excitatory and inhibitory circuits, leading to greater susceptibility to further cell loss via calcium-mediated excitotoxicity. Here, we present a mechanistic explanation of how directed brain stimulation might be expected to slow AD progression based on computational simulations in a 470-neuron biomimetic model of a neocortical column. The simulations demonstrate that the addition of low-intensity electrostimulation (neuroprosthesis) to a network undergoing AD-like cell death can raise global activity and break this homeostatic-excitotoxic cascade. The increase in activity within the remaining cells in the column results in lower scaling-driven AMPAR upregulation, reduced imbalances in excitatory and inhibitory circuits, and lower susceptibility to ongoing damage.
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Affiliation(s)
- Mark S Rowan
- School of Computer Science, University of Birmingham Birmingham, UK
| | - Samuel A Neymotin
- Department Physiology and Pharmacology, State University of New York Downstate Medical Center Brooklyn, NY, USA ; Department Neurobiology, Yale University School of Medicine New Haven, CT, USA
| | - William W Lytton
- Department Physiology and Pharmacology, State University of New York Downstate Medical Center Brooklyn, NY, USA ; Department Neurology, State University of New York Downstate Medical Center Brooklyn, NY, USA ; Department Neurology, Kings County Hospital Center Brooklyn, NY, USA
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Beuter A, Lefaucheur JP, Modolo J. Closed-loop cortical neuromodulation in Parkinson's disease: An alternative to deep brain stimulation? Clin Neurophysiol 2014; 125:874-85. [PMID: 24555921 DOI: 10.1016/j.clinph.2014.01.006] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 01/12/2014] [Accepted: 01/14/2014] [Indexed: 02/04/2023]
Abstract
Deep brain stimulation (DBS) is usually performed to treat advanced Parkinson's disease (PD) patients with electrodes permanently implanted in basal ganglia while the stimulator delivers electrical impulses continuously and independently of any feedback (open-loop stimulation). Conversely, in closed-loop stimulation, electrical stimulation is delivered as a function of neuronal activities recorded and analyzed online. There is an emerging development of closed-loop DBS in the treatment of PD and a growing discussion about proposing cortical stimulation rather than DBS for this purpose. Why does it make sense to "close the loop" to treat parkinsonian symptoms? Could closed-loop stimulation applied to the cortex become a valuable therapeutic strategy for PD? Can mathematical modeling contribute to the development of this technique? We review the various evidences in favor of the use of closed-loop cortical stimulation for the treatment of advanced PD, as an emerging technique which might offer substantial clinical benefits for PD patients.
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Affiliation(s)
- Anne Beuter
- Institut Polytechnique de Bordeaux, Talence, France.
| | - Jean-Pascal Lefaucheur
- Université Paris Est Créteil, Faculté de Médecine, EA 4391, Créteil, France; Assistance Publique - Hôpitaux de Paris, Hôpital Henri Mondor, Service de Physiologie - Explorations Fonctionnelles, Créteil, France.
| | - Julien Modolo
- Lawson Health Research Institute, Human Threshold Research Group, London, ON, Canada; Western University, Departments of Medical Biophysics and Medical Imaging, London, ON, Canada
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Thibeault CM, Srinivasa N. Using a hybrid neuron in physiologically inspired models of the basal ganglia. Front Comput Neurosci 2013; 7:88. [PMID: 23847524 PMCID: PMC3701869 DOI: 10.3389/fncom.2013.00088] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 06/15/2013] [Indexed: 11/15/2022] Open
Abstract
Our current understanding of the basal ganglia (BG) has facilitated the creation of computational models that have contributed novel theories, explored new functional anatomy and demonstrated results complementing physiological experiments. However, the utility of these models extends beyond these applications. Particularly in neuromorphic engineering, where the basal ganglia's role in computation is important for applications such as power efficient autonomous agents and model-based control strategies. The neurons used in existing computational models of the BG, however, are not amenable for many low-power hardware implementations. Motivated by a need for more hardware accessible networks, we replicate four published models of the BG, spanning single neuron and small networks, replacing the more computationally expensive neuron models with an Izhikevich hybrid neuron. This begins with a network modeling action-selection, where the basal activity levels and the ability to appropriately select the most salient input is reproduced. A Parkinson's disease model is then explored under normal conditions, Parkinsonian conditions and during subthalamic nucleus deep brain stimulation (DBS). The resulting network is capable of replicating the loss of thalamic relay capabilities in the Parkinsonian state and its return under DBS. This is also demonstrated using a network capable of action-selection. Finally, a study of correlation transfer under different patterns of Parkinsonian activity is presented. These networks successfully captured the significant results of the originals studies. This not only creates a foundation for neuromorphic hardware implementations but may also support the development of large-scale biophysical models. The former potentially providing a way of improving the efficacy of DBS and the latter allowing for the efficient simulation of larger more comprehensive networks.
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Affiliation(s)
- Corey M Thibeault
- Center for Neural and Emergent Systems, Information and System Sciences Laboratory, HRL Laboratories LLC. Malibu, CA, USA ; Department of Electrical and Biomedical Engineering, The University of Nevada Reno, NV, USA ; Department of Computer Science and Engineering, The University of Nevada Reno, NV, USA
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Rehan M, Hong KS. Modeling and automatic feedback control of tremor: adaptive estimation of deep brain stimulation. PLoS One 2013; 8:e62888. [PMID: 23638163 PMCID: PMC3634768 DOI: 10.1371/journal.pone.0062888] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2012] [Accepted: 03/26/2013] [Indexed: 11/18/2022] Open
Abstract
This paper discusses modeling and automatic feedback control of (postural and rest) tremor for adaptive-control-methodology-based estimation of deep brain stimulation (DBS) parameters. The simplest linear oscillator-based tremor model, between stimulation amplitude and tremor, is investigated by utilizing input-output knowledge. Further, a nonlinear generalization of the oscillator-based tremor model, useful for derivation of a control strategy involving incorporation of parametric-bound knowledge, is provided. Using the Lyapunov method, a robust adaptive output feedback control law, based on measurement of the tremor signal from the fingers of a patient, is formulated to estimate the stimulation amplitude required to control the tremor. By means of the proposed control strategy, an algorithm is developed for estimation of DBS parameters such as amplitude, frequency and pulse width, which provides a framework for development of an automatic clinical device for control of motor symptoms. The DBS parameter estimation results for the proposed control scheme are verified through numerical simulations.
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Affiliation(s)
- Muhammad Rehan
- Department of Electrical Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad, Pakistan.
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11
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Shine JM, Matar E, Ward PB, Bolitho SJ, Gilat M, Pearson M, Naismith SL, Lewis SJG. Exploring the cortical and subcortical functional magnetic resonance imaging changes associated with freezing in Parkinson's disease. ACTA ACUST UNITED AC 2013; 136:1204-15. [PMID: 23485851 DOI: 10.1093/brain/awt049] [Citation(s) in RCA: 174] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Freezing of gait is a devastating symptom of advanced Parkinson's disease yet the neural correlates of this phenomenon remain poorly understood. In this study, severity of freezing of gait was assessed in 18 patients with Parkinson's disease on a series of timed 'up and go' tasks, in which all patients suffered from episodes of clinical freezing of gait. The same patients also underwent functional magnetic resonance imaging with a virtual reality gait paradigm, performance on which has recently been shown to correlate with actual episodes of freezing of gait. Statistical parametric maps were created that compared the blood oxygen level-dependent response associated with paroxysmal motor arrests (freezing) to periods of normal motor output. The results of a random effects analysis revealed that these events were associated with a decreased blood oxygen level-dependent response in sensorimotor regions and an increased response within frontoparietal cortical regions. These signal changes were inversely correlated with the severity of clinical freezing of gait. Motor arrests were also associated with decreased blood oxygen level-dependent signal bilaterally in the head of caudate nucleus, the thalamus and the globus pallidus internus. Utilizing a mixed event-related/block design, we found that the decreased blood oxygen level-dependent response in the globus pallidus and the subthalamic nucleus persisted even after controlling for the effects of cognitive load, a finding which supports the notion that paroxysmal increases in basal ganglia outflow are associated with the freezing phenomenon. This method also revealed a decrease in the blood oxygen level-dependent response within the mesencephalic locomotor region during motor arrests, the magnitude of which was positively correlated with the severity of clinical freezing of gait. These results provide novel insights into the pathophysiology underlying freezing of gait and lend support to models of freezing of gait that implicate dysfunction across coordinated neural networks.
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Affiliation(s)
- James M Shine
- Parkinson’s Disease Research Clinic, Brain and Mind Research Institute, The University of Sydney, NSW 2050, Australia.
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12
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Lee JD, Huang CH, Yang ST, Chu YH, Shieh YY, Chen JW, Lin KJ. MRI/SPECT-based diagnosis and CT-guided high-intensity focused-ultrasound treatment system in MPTP mouse model of Parkinson's disease. Med Eng Phys 2013; 35:222-30. [DOI: 10.1016/j.medengphy.2012.01.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 11/15/2011] [Accepted: 01/13/2012] [Indexed: 10/28/2022]
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Shoffstall AJ, Taylor DM, Lavik EB. Engineering therapies in the CNS: what works and what can be translated. Neurosci Lett 2012; 519:147-54. [PMID: 22330751 DOI: 10.1016/j.neulet.2012.01.058] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Revised: 01/24/2012] [Accepted: 01/25/2012] [Indexed: 01/01/2023]
Abstract
Engineering is the art of taking what we know and using it to solve problems. As engineers, we build tool chests of approaches; we attempt to learn as much as possible about the problem at hand, and then we design, build, and test our approaches to see how they impact the system. The challenge of applying this approach to the central nervous system (CNS) is that we often do not know the details of what is needed from the biological side. New therapeutic options for treating the CNS range from new biomaterials to make scaffolds, to novel drug-delivery techniques, to functional electrical stimulation. However, the reality is that translating these new therapies and making them widely available to patients requires collaborations between scientists, engineers, clinicians, and patients to have the greatest chance of success. Here we discuss a variety of new treatment strategies and explore the pragmatic challenges involved with engineering therapies in the CNS.
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Affiliation(s)
- Andrew J Shoffstall
- Department of Biomedical Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106-1712, USA
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Mazzone P, Scarnati E, Garcia-Rill E. Commentary: the pedunculopontine nucleus: clinical experience, basic questions and future directions. J Neural Transm (Vienna) 2011; 118:1391-6. [PMID: 21188437 PMCID: PMC3654381 DOI: 10.1007/s00702-010-0530-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Accepted: 11/03/2010] [Indexed: 12/24/2022]
Abstract
This issue is dedicated to a potential new target for the treatment of movement disorders, the pedunculopontine tegmental nucleus (PPTg), or, more simply, the pedunculopontine nucleus, that some authors abbreviate as PPN. We provide an overview of the field as an introduction to the general reader, beginning with the clinical experience to date of Mazzone and co-workers in Rome, some basic questions that need to be addressed, and potential future directions required in order to ensure that the potential benefits of this work are realized.
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Affiliation(s)
- P. Mazzone
- Functional and Stereotactic Neurosurgery, CTO Hospital ASL Roma C, Via San Nemesio 21, 00145 Rome, Italy
| | - E. Scarnati
- Department of Biomedical Sciences and Technologies (STB), University of L’Aquila, Via Vetoio Coppito 2, 67100 L’Aquila, Italy
| | - E. Garcia-Rill
- Center for Translational Neuroscience, Department of Neurobiology & Developmental Sciences College of Medicine University of Arkansas for Medical Sciences, 4301 West Markham St. Little Rock, AR 72205, USA
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Modolo J, Legros A, Thomas AW, Beuter A. Model-driven therapeutic treatment of neurological disorders: reshaping brain rhythms with neuromodulation. Interface Focus 2010; 1:61-74. [PMID: 22419974 DOI: 10.1098/rsfs.2010.0509] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Accepted: 10/25/2010] [Indexed: 11/12/2022] Open
Abstract
Electric stimulation has been investigated for several decades to treat, with various degrees of success, a broad spectrum of neurological disorders. Historically, the development of these methods has been largely empirical but has led to a remarkably efficient, yet invasive treatment: deep brain stimulation (DBS). However, the efficiency of DBS is limited by our lack of understanding of the underlying physiological mechanisms and by the complex relationship existing between brain processing and behaviour. Biophysical modelling of brain activity, describing multi-scale spatio-temporal patterns of neuronal activity using a mathematical model and taking into account the physical properties of brain tissue, represents one way to fill this gap. In this review, we illustrate how biophysical modelling is beginning to emerge as a driving force orienting the development of innovative brain stimulation methods that may move DBS forward. We present examples of modelling works that have provided fruitful insights in regards to DBS underlying mechanisms, and others that also suggest potential improvements for this neurosurgical procedure. The reviewed literature emphasizes that biophysical modelling is a valuable tool to assist a rational development of electrical and/or magnetic brain stimulation methods tailored to both the disease and the patient's characteristics.
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Affiliation(s)
- Julien Modolo
- Lawson Health Research Institute, St Joseph Health Care , 268 Grosvenor Street, London , Canada
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Modolo J, Bhattacharya B, Edwards R, Campagnaud J, Legros A, Beuter A. Using a virtual cortical module implementing a neural field model to modulate brain rhythms in Parkinson's disease. Front Neurosci 2010; 4. [PMID: 20730081 PMCID: PMC2920509 DOI: 10.3389/fnins.2010.00045] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2009] [Accepted: 06/08/2010] [Indexed: 11/13/2022] Open
Abstract
We propose a new method for selective modulation of cortical rhythms based on neural field theory, in which the activity of a cortical area is extensively monitored using a two-dimensional microelectrode array. The example of Parkinson's disease illustrates the proposed method, in which a neural field model is assumed to accurately describe experimentally recorded activity. In addition, we propose a new closed-loop stimulation signal that is both space- and time- dependent. This method is especially designed to specifically modulate a targeted brain rhythm, without interfering with other rhythms. A new class of neuroprosthetic devices is also proposed, in which the multielectrode array is seen as an artificial neural network interacting with biological tissue. Such a bio-inspired approach may provide a solution to optimize interactions between the stimulation device and the cortex aiming to attenuate or augment specific cortical rhythms. The next step will be to validate this new approach experimentally in patients with Parkinson's disease.
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Affiliation(s)
- Julien Modolo
- Department of Medical Biophysics, Lawson Health Research Institute, University of Western Ontario London, ON, Canada
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