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Buch ER, Santarnecchi E, Antal A, Born J, Celnik PA, Classen J, Gerloff C, Hallett M, Hummel FC, Nitsche MA, Pascual-Leone A, Paulus WJ, Reis J, Robertson EM, Rothwell JC, Sandrini M, Schambra HM, Wassermann EM, Ziemann U, Cohen LG. Effects of tDCS on motor learning and memory formation: A consensus and critical position paper. Clin Neurophysiol 2017; 128:589-603. [PMID: 28231477 DOI: 10.1016/j.clinph.2017.01.004] [Citation(s) in RCA: 222] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 01/05/2017] [Accepted: 01/11/2017] [Indexed: 01/05/2023]
Abstract
Motor skills are required for activities of daily living. Transcranial direct current stimulation (tDCS) applied in association with motor skill learning has been investigated as a tool for enhancing training effects in health and disease. Here, we review the published literature investigating whether tDCS can facilitate the acquisition, retention or adaptation of motor skills. Work in multiple laboratories is underway to develop a mechanistic understanding of tDCS effects on different forms of learning and to optimize stimulation protocols. Efforts are required to improve reproducibility and standardization. Overall, reproducibility remains to be fully tested, effect sizes with present techniques vary over a wide range, and the basis of observed inter-individual variability in tDCS effects is incompletely understood. It is recommended that future studies explicitly state in the Methods the exploratory (hypothesis-generating) or hypothesis-driven (confirmatory) nature of the experimental designs. General research practices could be improved with prospective pre-registration of hypothesis-based investigations, more emphasis on the detailed description of methods (including all pertinent details to enable future modeling of induced current and experimental replication), and use of post-publication open data repositories. A checklist is proposed for reporting tDCS investigations in a way that can improve efforts to assess reproducibility.
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Affiliation(s)
- Ethan R Buch
- Human Cortical Physiology and Neurorehabilitation Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Emiliano Santarnecchi
- Berenson-Allen Center for Non-Invasive Brain Stimulation, Division of Cognitive Neurology, Department of Neurology, Beth Israel Medical Center, Harvard Medical School, Boston, MA, USA
| | - Andrea Antal
- Department of Clinical Neurophysiology, University Medical Center, Georg-August University, Göttingen, Germany
| | - Jan Born
- Institute for Medical Psychology and Behavioral Neurobiology, University of Tübingen, Tübingen, Germany; Centre for Integrative Neuroscience, University of Tübingen, Tübingen, Germany
| | - Pablo A Celnik
- Department of Physical Medicine and Rehabilitation, Johns Hopkins Medical Institution, Baltimore, MD, USA; Department of Neuroscience, Johns Hopkins Medical Institution, Baltimore, MD, USA
| | - Joseph Classen
- Department of Neurology, University of Leipzig, Leipzig, Germany
| | - Christian Gerloff
- Brain Imaging and NeuroStimulation (BINS) Laboratory, Department of Neurology University Medical Center Hamburg-Eppendorf Martinistr, Hamburg, Germany
| | - Mark Hallett
- Human Motor Control Section, National Institute of Neurological Disorders and Stroke, Bethesda, MD, USA
| | - Friedhelm C Hummel
- Brain Imaging and NeuroStimulation (BINS) Laboratory, Department of Neurology University Medical Center Hamburg-Eppendorf Martinistr, Hamburg, Germany
| | - Michael A Nitsche
- Department of Psychology and Neuroscience, Leibniz Research Center for Working Environment and Human Factors (IfADo), Dortmund, Germany
| | - Alvaro Pascual-Leone
- Berenson-Allen Center for Non-Invasive Brain Stimulation, Division of Cognitive Neurology, Department of Neurology, Beth Israel Medical Center, Harvard Medical School, Boston, MA, USA
| | - Walter J Paulus
- Department of Clinical Neurophysiology, University Medical Center, Georg-August University, Göttingen, Germany
| | - Janine Reis
- Department of Neurology, Albert Ludwigs University, Freiburg, Germany
| | - Edwin M Robertson
- Institute of Neuroscience and Psychology, University of Glasgow, Glasgow, UK
| | | | - Marco Sandrini
- Department of Psychology, University of Roehampton, London, UK
| | - Heidi M Schambra
- Department of Rehabilitation and Regenerative Medicine, Columbia University, New York, NY, USA
| | - Eric M Wassermann
- Behavioral Neurology Unit, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA
| | - Ulf Ziemann
- Department of Neurology & Stroke, and Hertie Institute for Clinical Brain Research, Eberhard Karls University, Tübingen, Germany
| | - Leonardo G Cohen
- Human Cortical Physiology and Neurorehabilitation Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA.
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Craig CE, Doumas M. Anodal Transcranial Direct Current Stimulation Shows Minimal, Measure-Specific Effects on Dynamic Postural Control in Young and Older Adults: A Double Blind, Sham-Controlled Study. PLoS One 2017; 12:e0170331. [PMID: 28099522 PMCID: PMC5242524 DOI: 10.1371/journal.pone.0170331] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 01/03/2017] [Indexed: 01/09/2023] Open
Abstract
We investigated whether stimulating the cerebellum and primary motor cortex (M1) using transcranial direct current stimulation (tDCS) could affect postural control in young and older adults. tDCS was employed using a double-blind, sham-controlled design, in which young (aged 18–35) and older adults (aged 65+) were assessed over three sessions, one for each stimulatory condition–M1, cerebellar and sham. The effect of tDCS on postural control was assessed using a sway-referencing paradigm, which induced platform rotations in proportion to the participant’s body sway, thus assessing sensory reweighting processes. Task difficulty was manipulated so that young adults experienced a support surface that was twice as compliant as that of older adults, in order to minimise baseline age differences in postural sway. Effects of tDCS on postural control were assessed during, immediately after and 30 minutes after tDCS. Additionally, the effect of tDCS on corticospinal excitability was measured by evaluating motor evoked potentials using transcranial magnetic stimulation immediately after and 30 minutes after tDCS. Minimal effects of tDCS on postural control were found in the eyes open condition only, and this was dependent on the measure assessed and age group. For young adults, stimulation had only offline effects, as cerebellar stimulation showed higher mean power frequency (MPF) of sway 30 minutes after stimulation. For older adults, both stimulation conditions delayed the increase in sway amplitude witnessed between blocks one and two until stimulation was no longer active. In conclusion, despite tDCS’ growing popularity, we would caution researchers to consider carefully the type of measures assessed and the groups targeted in tDCS studies of postural control.
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Affiliation(s)
- Chesney E. Craig
- School of Psychology, Queen’s University Belfast, Belfast, Co. Antrim, United Kingdom
- Research Centre for Health, Exercise and Active Living, Department of Exercise and Sport Science, Manchester Metropolitan University, Crewe, Cheshire, United Kingdom
- * E-mail:
| | - Michail Doumas
- School of Psychology, Queen’s University Belfast, Belfast, Co. Antrim, United Kingdom
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Wilke S, List J, Mekle R, Lindenberg R, Bukowski M, Ott S, Schubert F, Ittermann B, Flöel A. No Effect of Anodal Transcranial Direct Current Stimulation on Gamma-Aminobutyric Acid Levels in Patients with Recurrent Mild Traumatic Brain Injury. J Neurotrauma 2017; 34:281-290. [DOI: 10.1089/neu.2016.4399] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Skadi Wilke
- Department of Neurology, Charité–University Hospital, Berlin, Germany
| | - Jonathan List
- Department of Neurology, Charité–University Hospital, Berlin, Germany
| | - Ralf Mekle
- Physikalisch-Technische Bundesanstalt (PTB), Braunschweig und Berlin, Berlin, Germany
| | - Robert Lindenberg
- Department of Neurology, Charité–University Hospital, Berlin, Germany
| | - Martin Bukowski
- Department of Neurology, Charité–University Hospital, Berlin, Germany
| | - Stefanie Ott
- Department of Neurology, Charité–University Hospital, Berlin, Germany
| | - Florian Schubert
- Physikalisch-Technische Bundesanstalt (PTB), Braunschweig und Berlin, Berlin, Germany
| | - Bernd Ittermann
- Physikalisch-Technische Bundesanstalt (PTB), Braunschweig und Berlin, Berlin, Germany
| | - Agnes Flöel
- Department of Neurology, Charité–University Hospital, Berlin, Germany
- Center for Stroke Research Berlin, Charité–University Hospital, Berlin, Germany
- NeuroCure Cluster of Excellence, Charité–University Hospital, Berlin, Germany
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54
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Enhancement of motor consolidation by post-training transcranial direct current stimulation in older people. Neurobiol Aging 2017; 49:1-8. [DOI: 10.1016/j.neurobiolaging.2016.09.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 08/26/2016] [Accepted: 09/07/2016] [Indexed: 11/22/2022]
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Kirton A. Advancing non-invasive neuromodulation clinical trials in children: Lessons from perinatal stroke. Eur J Paediatr Neurol 2017; 21:75-103. [PMID: 27470654 DOI: 10.1016/j.ejpn.2016.07.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 06/21/2016] [Accepted: 07/02/2016] [Indexed: 12/18/2022]
Abstract
Applications of non-invasive brain stimulation including therapeutic neuromodulation are expanding at an alarming rate. Increasingly established scientific principles, including directional modulation of well-informed cortical targets, are advancing clinical trial development. However, high levels of disease burden coupled with zealous enthusiasm may be getting ahead of rational research and evidence. Experience is limited in the developing brain where additional issues must be considered. Properly designed and meticulously executed clinical trials are essential and required to advance and optimize the potential of non-invasive neuromodulation without risking the well-being of children and families. Perinatal stroke causes most hemiplegic cerebral palsy and, as a focal injury of defined timing in an otherwise healthy brain, is an ideal human model of developmental plasticity. Advanced models of how the motor systems of young brains develop following early stroke are affording novel windows of opportunity for neuromodulation clinical trials, possibly directing neuroplasticity toward better outcomes. Reviewing the principles of clinical trial design relevant to neuromodulation and using perinatal stroke as a model, this article reviews the current and future issues of advancing such trials in children.
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Affiliation(s)
- Adam Kirton
- Departments of Pediatrics and Clinical Neurosciences, Cumming School of Medicine, Hotchkiss Brain Institute and Alberta Children's Hospital Research Institute, 2888 Shaganappi Trail NW, Calgary, AB T3B6A8, Canada.
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Motor Sequence Learning in Healthy Older Adults Is Not Necessarily Facilitated by Transcranial Direct Current Stimulation (tDCS). Geriatrics (Basel) 2016; 1:geriatrics1040032. [PMID: 31022825 PMCID: PMC6371143 DOI: 10.3390/geriatrics1040032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Revised: 11/23/2016] [Accepted: 11/28/2016] [Indexed: 11/17/2022] Open
Abstract
Background: Transcranial Direct Current Stimulation (tDCS) of the primary motor cortex (M1) can modulate neuronal activity, and improve performance of basic motor tasks. The possibility that tDCS could assist in rehabilitation (e.g., for paresis post-stroke) offers hope but the evidence base is incomplete, with some behavioural studies reporting no effect of tDCS on complex motor learning. Older adults who show age-related decline in movement and learning (skills which tDCS could potentially facilitate), are also under-represented within tDCS literature. To address these issues, we examined whether tDCS would improve motor sequence learning in healthy young and older adults. Methods: In Experiment One, young participants learned 32 aiming movements using their preferred (right) hand whilst receiving: (i) 30 min Anodal Stimulation of left M1; (ii) 30 min Cathodal Stimulation of right M1; or (iii) 30 min Sham. Experiment Two used a similar task, but with older adults receiving Anodal Stimulation or Sham. Results: Whilst motor learning occurred in all participants, tDCS did not improve the rate or accuracy of motor learning for either age group. Conclusion: Our results suggest that the effects of tDCS may be limited to motor performance with no clear beneficial effects for motor learning.
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Fujiyama H, Hinder MR, Barzideh A, Van de Vijver C, Badache AC, Manrique-C MN, Reissig P, Zhang X, Levin O, Summers JJ, Swinnen SP. Preconditioning tDCS facilitates subsequent tDCS effect on skill acquisition in older adults. Neurobiol Aging 2016; 51:31-42. [PMID: 28033506 DOI: 10.1016/j.neurobiolaging.2016.11.012] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 11/08/2016] [Accepted: 11/19/2016] [Indexed: 01/24/2023]
Abstract
Functional motor declines that often occur with advancing age-including reduced efficacy to learn new skills-can have a substantial impact on the quality of life. Recent studies using noninvasive brain stimulation indicate that priming the corticospinal system by lowering the threshold for the induction of long-term potentiation-like plasticity before skill training may facilitate subsequent skill learning. Here, we used "priming" protocol, in which we used transcranial direct current stimulation (tDCS) applying the cathode over the primary motor cortex (M1) before the anode placed over M1 during unimanual isometric force control training (FORCEtraining). Older individuals who received tDCS with the cathode placed over M1 before tDCS with the anode placed over M1 concurrent with FORCEtraining showed greater skill improvement and corticospinal excitability increases following the tDCS/FORCEtraining protocol compared with both young and older individuals who did not receive the preceding tDCS with the cathode placed over M1. The results suggested that priming tDCS protocols may be used in clinical settings to improve motor function and thus maintain the functional independence of older adults.
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Affiliation(s)
- Hakuei Fujiyama
- Action and Cognition Laboratory, School of Psychology and Exercise Science, Murdoch University, Perth, Australia; Motor Control Laboratory, KU Leuven, Research Center of Movement Control and Neuroplasticity, Group Biomedical Sciences, Leuven, Belgium.
| | - Mark R Hinder
- Human Motor Control Laboratory, School of Medicine, University of Tasmania, Hobart, Australia
| | - Azadeh Barzideh
- Motor Control Laboratory, KU Leuven, Research Center of Movement Control and Neuroplasticity, Group Biomedical Sciences, Leuven, Belgium
| | - Charis Van de Vijver
- Motor Control Laboratory, KU Leuven, Research Center of Movement Control and Neuroplasticity, Group Biomedical Sciences, Leuven, Belgium
| | - Andreea C Badache
- Motor Control Laboratory, KU Leuven, Research Center of Movement Control and Neuroplasticity, Group Biomedical Sciences, Leuven, Belgium
| | - Maria Nathalya Manrique-C
- Motor Control Laboratory, KU Leuven, Research Center of Movement Control and Neuroplasticity, Group Biomedical Sciences, Leuven, Belgium
| | - Paola Reissig
- Human Motor Control Laboratory, School of Medicine, University of Tasmania, Hobart, Australia
| | - Xue Zhang
- Neural Control of Movement Laboratory, ETH, Zurich, Switzerland
| | - Oron Levin
- Motor Control Laboratory, KU Leuven, Research Center of Movement Control and Neuroplasticity, Group Biomedical Sciences, Leuven, Belgium
| | - Jeffery J Summers
- Human Motor Control Laboratory, School of Medicine, University of Tasmania, Hobart, Australia; Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
| | - Stephan P Swinnen
- Motor Control Laboratory, KU Leuven, Research Center of Movement Control and Neuroplasticity, Group Biomedical Sciences, Leuven, Belgium; KU Leuven, Leuven Research Institute for Neuroscience & Disease (LIND), Leuven, Belgium
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tDCS over left M1 or DLPFC does not improve learning of a bimanual coordination task. Sci Rep 2016; 6:35739. [PMID: 27779192 PMCID: PMC5078840 DOI: 10.1038/srep35739] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 10/04/2016] [Indexed: 12/21/2022] Open
Abstract
Previously, transcranial direct current stimulation (tDCS) over the primary motor cortex (M1) has resulted in improved performance in simple motor tasks. For a complex bimanual movement, studies using functional magnetic resonance imaging and transcranial magnetic stimulation indicated the involvement of the left dorsolateral prefrontal cortex (DLPFC) as well as left M1. Here we investigated the relative effect of up-regulating the cortical function in left DLPFC and left M1 with tDCS. Participants practised a complex bimanual task over four days while receiving either of five stimulation protocols: anodal tDCS applied over M1, anodal tDCS over DLPFC, sham tDCS over M1, sham tDCS over DLPFC, or no stimulation. Performance was measured at the start and end of each training day to make a distinction between acquisition and consolidation. Although task performance improved over days, no significant difference between stimulation protocols was observed, suggesting that anodal tDCS had little effect on learning the bimanual task regardless of the stimulation sites and learning phase (acquisition or consolidation). Interestingly, cognitive performance as well as corticomotor excitability did not change following stimulation. Accordingly, we found no evidence for behavioural or neurophysiological changes following tDCS over left M1 or left DLPFC in learning a complex bimanual task.
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Conley AC, Fulham WR, Marquez JL, Parsons MW, Karayanidis F. No Effect of Anodal Transcranial Direct Current Stimulation Over the Motor Cortex on Response-Related ERPs during a Conflict Task. Front Hum Neurosci 2016; 10:384. [PMID: 27547180 PMCID: PMC4974251 DOI: 10.3389/fnhum.2016.00384] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 07/14/2016] [Indexed: 11/25/2022] Open
Abstract
Anodal transcranial direct current stimulation (tDCS) over the motor cortex is considered a potential treatment for motor rehabilitation following stroke and other neurological pathologies. However, both the context under which this stimulation is effective and the underlying mechanisms remain to be determined. In this study, we examined the mechanisms by which anodal tDCS may affect motor performance by recording event-related potentials (ERPs) during a cued go/nogo task after anodal tDCS over dominant primary motor cortex (M1) in young adults (Experiment 1) and both dominant and non-dominant M1 in older adults (Experiment 2). In both experiments, anodal tDCS had no effect on either response time (RT) or response-related ERPs, including the cue-locked contingent negative variation (CNV) and both target-locked and response-locked lateralized readiness potentials (LRP). Bayesian model selection analyses showed that, for all measures, the null effects model was stronger than a model including anodal tDCS vs. sham. We conclude that anodal tDCS has no effect on RT or response-related ERPs during a cued go/nogo task in either young or older adults.
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Affiliation(s)
- Alexander C Conley
- Functional Neuroimaging Laboratory, School of Psychology, Faculty of Science and IT, University of NewcastleNewcastle, NSW, Australia; Priority Research Centre for Stroke and Brain Injury, University of NewcastleNewcastle, NSW, Australia; Hunter Medical Research InstituteNewcastle, NSW, Australia
| | - W R Fulham
- Functional Neuroimaging Laboratory, School of Psychology, Faculty of Science and IT, University of NewcastleNewcastle, NSW, Australia; Priority Research Centre for Stroke and Brain Injury, University of NewcastleNewcastle, NSW, Australia; Hunter Medical Research InstituteNewcastle, NSW, Australia
| | - Jodie L Marquez
- Priority Research Centre for Stroke and Brain Injury, University of NewcastleNewcastle, NSW, Australia; Hunter Medical Research InstituteNewcastle, NSW, Australia; School of Health Sciences, Faculty of Health, University of NewcastleNewcastle, NSW, Australia
| | - Mark W Parsons
- Priority Research Centre for Stroke and Brain Injury, University of NewcastleNewcastle, NSW, Australia; Hunter Medical Research InstituteNewcastle, NSW, Australia; School of Medicine and Public Health, Faculty of Health, University of NewcastleNewcastle, NSW, Australia
| | - Frini Karayanidis
- Functional Neuroimaging Laboratory, School of Psychology, Faculty of Science and IT, University of NewcastleNewcastle, NSW, Australia; Priority Research Centre for Stroke and Brain Injury, University of NewcastleNewcastle, NSW, Australia; Hunter Medical Research InstituteNewcastle, NSW, Australia
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60
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Tatti E, Rossi S, Innocenti I, Rossi A, Santarnecchi E. Non-invasive brain stimulation of the aging brain: State of the art and future perspectives. Ageing Res Rev 2016; 29:66-89. [PMID: 27221544 DOI: 10.1016/j.arr.2016.05.006] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 05/01/2016] [Accepted: 05/13/2016] [Indexed: 12/19/2022]
Abstract
Favored by increased life expectancy and reduced birth rate, worldwide demography is rapidly shifting to older ages. The golden age of aging is not only an achievement but also a big challenge because of the load of the elderly on social and medical health care systems. Moreover, the impact of age-related decline of attention, memory, reasoning and executive functions on self-sufficiency emphasizes the need of interventions to maintain cognitive abilities at a useful degree in old age. Recently, neuroscientific research explored the chance to apply Non-Invasive Brain Stimulation (NiBS) techniques (as transcranial electrical and magnetic stimulation) to healthy aging population to preserve or enhance physiologically-declining cognitive functions. The present review will update and address the current state of the art on NiBS in healthy aging. Feasibility of NiBS techniques will be discussed in light of recent neuroimaging (either structural or functional) and neurophysiological models proposed to explain neural substrates of the physiologically aging brain. Further, the chance to design multidisciplinary interventions to maximize the efficacy of NiBS techniques will be introduced as a necessary future direction.
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Transcranial stimulation over the left inferior frontal gyrus increases false alarms in an associative memory task in older adults. ACTA ACUST UNITED AC 2016; 5. [PMID: 29057219 PMCID: PMC5650110 DOI: 10.1097/01.hxr.0000491108.83234.85] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Background Transcranial direct current stimulation (tDCS) is a potential tool for alleviating various forms of cognitive decline, including memory loss, in older adults. However, past effects of tDCS on cognitive ability have been mixed. One important potential moderator of tDCS effects is the baseline level of cognitive performance. Methods We tested the effects of tDCS on face-name associative memory in older adults, who suffer from performance deficits in this task relative to younger adults. Stimulation was applied to the left inferior prefrontal cortex during encoding of face-name pairs, and memory was assessed with both a recognition and recall task. Results Face–name memory performance was decreased with the use of tDCS. This result was driven by increased false alarms when recognizing rearranged face–name pairs. Conclusions This result suggests that tDCS can lead to increased false alarm rates in recognition memory, and that effects of tDCS on a specific cognitive task may depend upon cognitive capability for that task.
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Marquez J, Conley A, Karayanidis F, Lagopoulos J, Parsons M. Anodal direct current stimulation in the healthy aged: Effects determined by the hemisphere stimulated. Restor Neurol Neurosci 2016; 33:509-19. [PMID: 26409409 PMCID: PMC4923724 DOI: 10.3233/rnn-140490] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Purpose: Research popularity and scope for the application of transcranial direct current stimulation have been steadily increasing yet many fundamental questions remain unanswered. We sought to determine if anodal stimulation of either hemisphere leads to improved performance of the contralateral hand and/or altered function of the ipsilateral hand, or affects movement preparation, in older subjects. Method: In this cross-over, double blind, sham controlled study, 34 healthy aged participants (age range 40– 86) were randomised to receive 20 minutes of stimulation to either the dominant or non-dominant motor cortex. The primary outcome was functional performance of both upper limbs measured by the Jebsen Taylor Test and hand grip strength. Additionally, we measured motor preparation using electrophysiological (EEG) recordings. Results: Anodal stimulation resulted in statistically significantly improved performance of the non-dominant hand (p < 0.01) but did not produce significant changes in the dominant hand on any measure (p > 0.05). This effect occurred irrespective of the hemisphere stimulated. Stimulation did not produce significant effects on measures of gross function, grip strength, reaction times, or electrophysiological measures on the EEG data. Conclusion: This study demonstrated that the hemispheres respond differently to anodal stimulation and the response appears to be task specific but not mediated by age.
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Affiliation(s)
- Jodie Marquez
- Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, Australia.,Hunter Medical Institute, New Lambton, NSW, Australia
| | - Alexander Conley
- Hunter Medical Institute, New Lambton, NSW, Australia.,Faculty of Science and IT, University of Newcastle, Callaghan, NSW, Australia
| | - Frini Karayanidis
- Hunter Medical Institute, New Lambton, NSW, Australia.,Faculty of Science and IT, University of Newcastle, Callaghan, NSW, Australia
| | - Jim Lagopoulos
- Brain and Mind Institute, Sydney University, Sydney, NSW, Australia
| | - Mark Parsons
- Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, Australia.,Hunter Medical Institute, New Lambton, NSW, Australia.,Department of Neurology, John Hunter Hospital, New Lambton, NSW, Australia
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Perceval G, Flöel A, Meinzer M. Can transcranial direct current stimulation counteract age-associated functional impairment? Neurosci Biobehav Rev 2016; 65:157-72. [DOI: 10.1016/j.neubiorev.2016.03.028] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 02/05/2016] [Accepted: 03/14/2016] [Indexed: 12/21/2022]
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Hendy AM, Teo WP, Kidgell DJ. Anodal Transcranial Direct Current Stimulation Prolongs the Cross-education of Strength and Corticomotor Plasticity. Med Sci Sports Exerc 2016; 47:1788-97. [PMID: 25551405 DOI: 10.1249/mss.0000000000000600] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
PURPOSE This study aimed to assess the efficacy of applying anodal transcranial direct-current stimulation (a-tDCS) to the ipsilateral motor cortex (iM1) during unilateral strength training to enhance the neurophysiological and functional effects of cross-education. METHODS Twenty-four healthy volunteers were randomly allocated to perform either of the following: strength training during a-tDCS (ST + a-tDCS), strength training during sham tDCS (ST + sham), or a-tDCS during rest (a-tDCS) across 2 wk. Strength training of the right biceps brachii involved four sets of six repetitions at 80% of one-repetition maximum three times per week. Anodal tDCS was applied to the iM1 at 1.5 mA for 15 min during each strength training session. Outcome measures included one-repetition maximum strength of the untrained biceps brachii, corticomotoneuronal excitability, cross-activation, and short-interval intracortical inhibition (SICI) of the iM1 determined by transcranial magnetic stimulation. RESULTS Immediately after the final training session, there was an increase in strength for both the ST + a-tDCS (12.5%, P < 0.001) and the ST + sham group (9.4%, P = 0.007), which was accompanied by significant increases in corticomotoneuronal excitability and decreases in SICI for both groups. After a 48-h retention period, strength increase was maintained in the ST + a-tDCS (13.0%, P = 0.001) group, which was significantly greater than the ST + sham group (7.6%, P = 0.039). Similarly, increases in corticomotoneuronal excitability and decreases in SICI were maintained in the ST + a-tDCS group but not in the ST + sham group. No main effects were reported for the a-tDCS group (all P > 0.05). CONCLUSIONS The addition of a-tDCS to the iM1 during unilateral strength training prolongs the benefits of cross-education, which may have significant implications to enhancement of rehabilitation outcomes after a single-limb injury or impairment.
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Affiliation(s)
- Ashlee M Hendy
- 1Centre for Physical Activity and Nutrition Research, Faculty of Health, Deakin University, Burwood, Victoria, AUSTRALIA; and 2School of Allied Health, Department of Rehabilitation, Nutrition and Sport, La Trobe University, Bundoora, Victoria, AUSTRALIA
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Kaneko F, Shibata E, Hayami T, Nagahata K, Aoyama T. The association of motor imagery and kinesthetic illusion prolongs the effect of transcranial direct current stimulation on corticospinal tract excitability. J Neuroeng Rehabil 2016; 13:36. [PMID: 27079199 PMCID: PMC4832525 DOI: 10.1186/s12984-016-0143-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 03/22/2016] [Indexed: 01/09/2023] Open
Abstract
Background A kinesthetic illusion induced by a visual stimulus (KI) can produce vivid kinesthetic perception. During KI, corticospinal tract excitability increases and results in the activation of cerebral networks. Transcranial direct current stimulation (tDCS) is emerging as an alternative potential therapeutic modality for a variety of neurological and psychiatric conditions, such that identifying factors that enhance the magnitude and duration of tDCS effects is currently a topic of great scientific interest. This study aimed to establish whether the combination of tDCS with KI and sensory-motor imagery (MI) induces larger and longer-lasting effects on the excitability of corticomotor pathways in healthy Japanese subjects. Methods A total of 21 healthy male volunteers participated in this study. Four interventions were investigated in the first experiment: (1) anodal tDCS alone (tDCSa), (2) anodal tDCS with visually evoked kinesthetic illusion (tDCSa + KI), (3) anodal tDCS with motor imagery (tDCSa + MI), and (4) anodal tDCS with kinesthetic illusion and motor imagery (tDCSa + KIMI). In the second experiment, we added a sham tDCS intervention with kinesthetic illusion and motor imagery (sham + KIMI) as a control for the tDCSa + KIMI condition. Direct currents were applied to the right primary motor cortex. Corticospinal excitability was examined using transcranial magnetic stimulation of the area associated with the left first dorsal interosseous. Results In the first experiment, corticomotor excitability was sustained for at least 30 min following tDCSa + KIMI (p < 0.01). The effect of tDCSa + KIMI on corticomotor excitability was greater and longer-lasting than that achieved in all other conditions. In the second experiment, significant effects were not achieved following sham + KIMI. Conclusions Our results suggest that tDCSa + KIMI has a greater therapeutic potential than tDCS alone for inducing higher excitability of the corticospinal tract. The observed effects may be related to sustained potentiation of resultant cerebral activity during combined KI, MI, and tDCSa.
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Affiliation(s)
- Fuminari Kaneko
- Laboratory of Sensory Motor Science and Sports Neuroscience, First Division of Physical Therapy, Sapporo Medical University, West 17- South 1, Chuo-ku, Sapporo City, Japan. .,Development Research Group for Advanced Neuroscience-based Rehabilitation, Sapporo Medical University, West 17- South 1, Chuo-ku, Sapporo City, Japan.
| | - Eriko Shibata
- Laboratory of Sensory Motor Science and Sports Neuroscience, First Division of Physical Therapy, Sapporo Medical University, West 17- South 1, Chuo-ku, Sapporo City, Japan.,Development Research Group for Advanced Neuroscience-based Rehabilitation, Sapporo Medical University, West 17- South 1, Chuo-ku, Sapporo City, Japan
| | - Tatsuya Hayami
- Laboratory of Sensory Motor Science and Sports Neuroscience, First Division of Physical Therapy, Sapporo Medical University, West 17- South 1, Chuo-ku, Sapporo City, Japan.,Division of Health Science Education, School of General Education, Shinshu University, Asahi 3-1-1, Matsumoto City, Japan
| | - Keita Nagahata
- Laboratory of Sensory Motor Science and Sports Neuroscience, First Division of Physical Therapy, Sapporo Medical University, West 17- South 1, Chuo-ku, Sapporo City, Japan.,Noboribetsu Hospital, Noboribetsuonsencho133, Noboribetsu City, Japan
| | - Toshiyuki Aoyama
- Laboratory of Sensory Motor Science and Sports Neuroscience, First Division of Physical Therapy, Sapporo Medical University, West 17- South 1, Chuo-ku, Sapporo City, Japan.,Department of Physical Therapy, Ibaraki Prefectural University of Health Sciences, 4669-2, Ami, Ami-machi, Inashiki-gun, Ibaraki, Japan
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66
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Besson P, Perrey S, Teo WP, Muthalib M. Commentary: Cumulative effects of anodal and priming cathodal tDCS on pegboard test performance and motor cortical excitability. Front Hum Neurosci 2016; 10:70. [PMID: 26973492 PMCID: PMC4771759 DOI: 10.3389/fnhum.2016.00070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2015] [Accepted: 02/12/2016] [Indexed: 11/13/2022] Open
Affiliation(s)
- Pierre Besson
- EuroMov, University of Montpellier Montpellier, France
| | | | - Wei-Peng Teo
- School of Exercise and Nutrition Sciences, Deakin University Melbourne, VIC, Australia
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Multisession Anodal tDCS Protocol Improves Motor System Function in an Aging Population. Neural Plast 2016; 2016:5961362. [PMID: 26881118 PMCID: PMC4736991 DOI: 10.1155/2016/5961362] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 11/17/2015] [Accepted: 11/22/2015] [Indexed: 01/01/2023] Open
Abstract
OBJECTIVES The primary objective of this study was to investigate the effects of five consecutive, daily 20-minute sessions of M1 a-tDCS on motor learning in healthy, cognitively intact, aging adults. DESIGN A total of 23 participants (51 to 69 years old) performed five consecutive, daily 20-minute sessions of a serial reaction time task (SRT task) concomitant with either anodal (n = 12) or sham (n = 11) M1 a-tDCS. RESULTS We found a significant group × training sessions interaction, indicating that whereas aging adults in the sham group exhibited little-to-no sequence-specific learning improvements beyond the first day of training, reproducible improvements in the ability to learn new motor sequences over 5 consecutive sessions were the net result in age-equivalent participants from the M1 a-tDCS group. A significant main effect of group on sequence-specific learning revealed greater motor learning for the M1 a-tDCS group when the five learning sessions were averaged. CONCLUSION These findings raise into prominence the utility of multisession anodal TDCS protocols in combination with motor training to help prevent/alleviate age-associated motor function decline.
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68
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Bartrés-Faz D, Vidal-Piñeiro D. Noninvasive Brain Stimulation for the Study of Memory Enhancement in Aging. EUROPEAN PSYCHOLOGIST 2016. [DOI: 10.1027/1016-9040/a000241] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Abstract. Noninvasive brain stimulation (NIBS) techniques have recently attracted interest due to their potential for transiently improving cognition. This may prove particularly valuable in aging, given the known impact of age-related cognitive dysfunction on quality of life. The present review summarizes the currently available evidence of working and episodic memory enhancements achieved using NIBS in healthy elderly people. The evidence reviewed indicates that research is still at an early stage and that there is a need to define the best procedures for operating and performing multicentre characterization of protocols. However, a limited number of sham-controlled studies have reported improvements in both cognitive domains. Furthermore, evidences of long-term beneficial effects opens up the possibility of using NIBS as an adjuvant therapeutic strategy. However, the relevance of certain variables involved and approaches used remains to be elucidated, including the potential benefits of single versus multiple NIBS sessions, the putative synergistic effects of using NIBS in combination with cognitive training, and the importance of individual differences. Overall, NIBS techniques represent a promising opportunity for psychologists seeking strategies to improve memory functions in the elderly. Nevertheless, their use requires appropriate technical knowledge coupled with a clear understanding of the neurophysiology and cognitive neuroscience of aging.
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Affiliation(s)
| | - Didac Vidal-Piñeiro
- Research Group for Lifespan Changes in Brain and Cognition, Department of Psychology, University of Oslo, Norway
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69
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Summers JJ, Kang N, Cauraugh JH. Does transcranial direct current stimulation enhance cognitive and motor functions in the ageing brain? A systematic review and meta- analysis. Ageing Res Rev 2016; 25:42-54. [PMID: 26607412 DOI: 10.1016/j.arr.2015.11.004] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 11/09/2015] [Accepted: 11/16/2015] [Indexed: 02/03/2023]
Abstract
The use of transcranial direct current stimulation (tDCS) to enhance cognitive and motor functions has enjoyed a massive increase in popularity. Modifying neuroplasticity via non-invasive cortical stimulation has enormous potential to slow or even reverse declines in functions associated with ageing. The current meta-analysis evaluated the effects of tDCS on cognitive and motor performance in healthy older adults. Of the 81 studies identified, 25 qualified for inclusion. A random effects model meta-analysis revealed a significant overall standardized mean difference equal to 0.53 (SE=0.09; medium heterogeneity: I(2)=57.08%; and high fail-safe: N=448). Five analyses on moderator variables indicated significant tDCS beneficial effects: (a) on both cognitive and motor task performances, (b) across a wide-range of cognitive tasks, (c) on specific brain areas, (d) stimulation offline (before) or online (during) the cognitive and motor tasks. Although the meta-analysis revealed robust support for enhancing both cognitive and motor performance, we outline a number of caveats on the use of tDCS.
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70
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Broeder S, Nackaerts E, Heremans E, Vervoort G, Meesen R, Verheyden G, Nieuwboer A. Transcranial direct current stimulation in Parkinson's disease: Neurophysiological mechanisms and behavioral effects. Neurosci Biobehav Rev 2015; 57:105-17. [DOI: 10.1016/j.neubiorev.2015.08.010] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 07/16/2015] [Accepted: 08/17/2015] [Indexed: 10/23/2022]
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Vaseghi B, Zoghi M, Jaberzadeh S. The effects of anodal-tDCS on corticospinal excitability enhancement and its after-effects: conventional vs. unihemispheric concurrent dual-site stimulation. Front Hum Neurosci 2015; 9:533. [PMID: 27242498 PMCID: PMC4871166 DOI: 10.3389/fnhum.2015.00533] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 09/14/2015] [Indexed: 12/13/2022] Open
Abstract
Previous researchers have approved the ability of anodal transcranial direct current stimulation (a-tDCS) of the primary motor cortex (M1) to enhance corticospinal excitability (CSE). The primary aim of the current study was to investigate the effect of concurrent stimulation of M1 and a functionally connected cortical site of M1 on CSE modulation. This new technique is called unihemispheric concurrent dual-site a-tDCS (a-tDCSUHCDS). The secondary aim was to investigate the mechanisms underlying the efficacy of this new approach in healthy individuals. In a randomized crossover study, 12 healthy right-handed volunteers received a-tDCS under five conditions: a-tDCS of M1, a-tDCSUHCDS of M1-dorsolateral prefrontal cortex (DLPFC), a-tDCSUHCDS of M1-primary sensory cortex (S1), a-tDCSUHCDS of M1-primary visual cortex (V1), and sham a-tDCSUHCDS. Peak-to-peak amplitude of transcranial magnetic stimulation (TMS) induced MEPs, short-interval intracortical inhibition (SICI) and intracortical facilitation (ICF) were assessed before and four times after each condition. A-tDCSUHCDS conditions induced larger MEPs than conventional a-tDCS. The level of M1 CSE was significantly higher following a-tDCSUHCDS of M1-DLPFC than other a-tDCSUHCDS conditions (p < 0.001), and lasted for over 24 h. The paired-pulse TMS results after a-tDCS of M1-DLPFC showed significant facilitatory increase and inhibitory change. A-tDCSUHCDS of M1-DLPFC increases M1 CSE twofold that of conventional a-tDCS. A-tDCSUHCDS of M1-DLPFC enhances the activity of glutamergic mechanisms for at least 24 h. Such long-lasting M1 CSE enhancement induced by a-tDCSUHCDS of M1-DLPFC could be a valuable finding in clinical scenarios such as learning, motor performance, or pain management. The present study has been registered on the Australian New Zealand Clinical Trial at http://www.anzctr.org.au/ with registry number of ACTRN12614000817640.
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Affiliation(s)
- Bita Vaseghi
- Faculty of Medicine, Department of Physiotherapy, School of Primary Health Care, Nursing and Health Sciences, Monash University Melbourne, Australia
| | - Maryam Zoghi
- Department of Medicine, Royal Melbourne Hospital, The University of Melbourne Parkville, Australia
| | - Shapour Jaberzadeh
- Faculty of Medicine, Department of Physiotherapy, School of Primary Health Care, Nursing and Health Sciences, Monash University Melbourne, Australia
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72
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No Effect of 2 mA Anodal tDCS Over the M1 on Performance and Practice Effect on Grooved Pegboard Test and Trail Making Test B. eNeuro 2015; 2:eN-NWR-0072-14. [PMID: 26465001 PMCID: PMC4596020 DOI: 10.1523/eneuro.0072-14.2015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 07/06/2015] [Accepted: 07/07/2015] [Indexed: 12/27/2022] Open
Abstract
Previous studies suggest that transcranial direct current stimulation (tDCS) can facilitate motor performance and learning. In this double-blind experiment, 60 healthy human subjects (29 females) were randomized into three groups (active tDCS, sham tDCS, and no-treatment control group) in order to investigate the effect of a 20 min session of 2 mA tDCS over the motor cortex contralateral to the dominant hand on practice effect and performance on the Grooved Pegboard Test (GPT) and Trail Making Test (TMT). Performance was operationalized as the time to complete the tests before, during, and after stimulation. The practice effect was termed as the difference in time to complete the tests from pretest to post-test. Data on body mass index (BMI), head circumference, sleep status, interelectrode impedance, and caffeine and nicotine use were sampled to control for the influence of individual differences on the effect of tDCS. Adverse effects were registered using a standardized form. The results indicated no effect of tDCS on performance and practice effects on the GPT and TMT. For all groups, BMI was a predictor for a practice effect on the TMT. In the active tDCS group, high caffeine intake and low impedance predicted a practice effect on the GPT for the dominant hand. The present results suggest that impedance levels in tDCS studies should be routinely reported in future studies, as it might not only provide valuable information on the efficacy of the blinding conditions and participant discomfort, but also correlate with individual differences that are relevant to the outcome of the stimulation.
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73
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Shin YI, Foerster Á, Nitsche MA. Reprint of: Transcranial direct current stimulation (tDCS) – Application in neuropsychology. Neuropsychologia 2015; 74:74-95. [DOI: 10.1016/j.neuropsychologia.2015.06.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 01/29/2015] [Accepted: 02/02/2015] [Indexed: 01/07/2023]
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74
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Panouillères MTN, Joundi RA, Brittain JS, Jenkinson N. Reversing motor adaptation deficits in the ageing brain using non-invasive stimulation. J Physiol 2015; 593:3645-55. [PMID: 25929230 PMCID: PMC4560588 DOI: 10.1113/jp270484] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 04/26/2015] [Indexed: 11/17/2022] Open
Abstract
Healthy ageing is characterised by deterioration of motor performance. In normal circumstances motor adaptation corrects for movements’ inaccuracies and as such, it is critical in maintaining optimal motor control. However, motor adaptation performance is also known to decline with age. Anodal transcranial direct current stimulation (TDCS) of the cerebellum and the primary motor cortex (M1) have been found to improve visuomotor adaptation in healthy young and older adults. However, no study has directly compared the effect of TDCS on motor adaptation between the two age populations. The aim of our study was to investigate whether the application of anodal TDCS over the lateral cerebellum and M1 affected motor adaptation in young and older adults similarly. Young and older participants performed a visuomotor rotation task and concurrently received TDCS over the left M1, the right cerebellum or received sham stimulation. Our results replicated the finding that older adults are impaired compared to the young adults in visuomotor adaptation. At the end of the adaptation session, older adults displayed a larger error (−17 deg) than the young adults (−10 deg). The stimulation of the lateral cerebellum did not change the adaptation in both age groups. In contrast, anodal TDCS over M1 improved initial adaptation in both age groups by around 30% compared to sham and this improvement lasted up to 40 min after the end of the stimulation. These results demonstrate that TDCS of M1 can enhance visuomotor adaptation, via mechanisms that remain available in the ageing population.
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Affiliation(s)
- Muriel T N Panouillères
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, OX3 9DU, UK
| | - Raed A Joundi
- Department of Physiology, Anatomy and Genetics, University of Oxford, South Parks Road, Oxford, OX1 3QX, UK
| | - John-Stuart Brittain
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, OX3 9DU, UK
| | - Ned Jenkinson
- Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, OX3 9DU, UK.,School of Sport, Exercise and Rehabilitation Sciences, The University of Birmingham, Birmingham, B15 2TT, UK
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75
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Puri R, Hinder MR, Fujiyama H, Gomez R, Carson RG, Summers JJ. Duration-dependent effects of the BDNF Val66Met polymorphism on anodal tDCS induced motor cortex plasticity in older adults: a group and individual perspective. Front Aging Neurosci 2015; 7:107. [PMID: 26097454 PMCID: PMC4456583 DOI: 10.3389/fnagi.2015.00107] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Accepted: 05/21/2015] [Indexed: 01/09/2023] Open
Abstract
The brain derived neurotrophic factor (BDNF) Val66Met polymorphism and stimulation duration are thought to play an important role in modulating motor cortex plasticity induced by non-invasive brain stimulation (NBS). In the present study we sought to determine whether these factors interact or exert independent effects in older adults. Fifty-four healthy older adults (mean age = 66.85 years) underwent two counterbalanced sessions of 1.5 mA anodal transcranial direct current stimulation (atDCS), applied over left M1 for either 10 or 20 min. Single pulse transcranial magnetic stimulation (TMS) was used to assess corticospinal excitability (CSE) before and every 5 min for 30 min following atDCS. On a group level, there was an interaction between stimulation duration and BDNF genotype, with Met carriers (n = 13) showing greater post-intervention potentiation of CSE compared to Val66Val homozygotes homozygotes (n = 37) following 20 min (p = 0.002) but not 10 min (p = 0.219) of stimulation. Moreover, Met carriers, but not Val/Val homozygotes, exhibited larger responses to TMS (p = 0.046) after 20 min atDCS, than following 10 min atDCS. On an individual level, two-step cluster analysis revealed a considerable degree of inter-individual variability, with under half of the total sample (42%) showing the expected potentiation of CSE in response to atDCS across both sessions. Intra-individual variability in response to different durations of atDCS was also apparent, with one-third of the total sample (34%) exhibiting LTP-like effects in one session but LTD-like effects in the other session. Both the inter-individual (p = 0.027) and intra-individual (p = 0.04) variability was associated with BDNF genotype. In older adults, the BDNF Val66Met polymorphism along with stimulation duration appears to play a role in modulating tDCS-induced motor cortex plasticity. The results may have implications for the design of NBS protocols for healthy and diseased aged populations.
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Affiliation(s)
- Rohan Puri
- Human Motor Control Laboratory, School of Medicine, Faculty of Health, University of Tasmania, Hobart TAS, Australia
| | - Mark R Hinder
- Human Motor Control Laboratory, School of Medicine, Faculty of Health, University of Tasmania, Hobart TAS, Australia
| | - Hakuei Fujiyama
- Human Motor Control Laboratory, School of Medicine, Faculty of Health, University of Tasmania, Hobart TAS, Australia ; Movement Control and Neuroplasticity Research Group, Department of Kinesiology KU Leuven, Belgium
| | - Rapson Gomez
- School of Health Sciences, Federation University Australia, Ballarat VIC, Australia
| | - Richard G Carson
- Trinity College Institute of Neuroscience and School of Psychology, Trinity College Dublin Dublin, Ireland ; School of Psychology, Queen's University Belfast Belfast, UK
| | - Jeffery J Summers
- Human Motor Control Laboratory, School of Medicine, Faculty of Health, University of Tasmania, Hobart TAS, Australia ; Research Institute for Sport and Exercise Sciences, Liverpool John Moores University Liverpool, UK
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76
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Rroji O, van Kuyck K, Nuttin B, Wenderoth N. Anodal tDCS over the Primary Motor Cortex Facilitates Long-Term Memory Formation Reflecting Use-Dependent Plasticity. PLoS One 2015; 10:e0127270. [PMID: 25996937 PMCID: PMC4440644 DOI: 10.1371/journal.pone.0127270] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Accepted: 04/13/2015] [Indexed: 11/19/2022] Open
Abstract
Previous research suggests that anodal transcranial direct current stimulation (tDCS) over the primary motor cortex (M1) modulates NMDA receptor dependent processes that mediate synaptic plasticity. Here we test this proposal by applying anodal versus sham tDCS while subjects practiced to flex the thumb as fast as possible (ballistic movements). Repetitive practice of this task has been shown to result in performance improvements that reflect use-dependent plasticity resulting from NMDA receptor mediated, long-term potentiation (LTP)-like processes. Using a double-blind within-subject cross-over design, subjects (n=14) participated either in an anodal or a sham tDCS session which were at least 3 months apart. Sham or anodal tDCS (1 mA) was applied for 20 min during motor practice and retention was tested 30 min, 24 hours and one week later. All subjects improved performance during each of the two sessions (p < 0.001) and learning gains were similar. Our main result is that long term retention performance (i.e. 1 week after practice) was significantly better when practice was performed with anodal tDCS than with sham tDCS (p < 0.001). This effect was large (Cohen's d=1.01) and all but one subject followed the group trend. Our data strongly suggest that anodal tDCS facilitates long-term memory formation reflecting use-dependent plasticity. Our results support the notion that anodal tDCS facilitates synaptic plasticity mediated by an LTP-like mechanism, which is in accordance with previous research.
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Affiliation(s)
- Orjon Rroji
- Department of Kinesiology, Research Center for Movement Control and Neuroplasticity, KU Leuven, Leuven, Belgium
| | - Kris van Kuyck
- Department of Neurosciences, Research Group Experimental Neurosurgery and Neuroanatomy, KU Leuven, Leuven, Belgium
| | - Bart Nuttin
- Department of Neurosciences, Research Group Experimental Neurosurgery and Neuroanatomy, KU Leuven, Leuven, Belgium
| | - Nicole Wenderoth
- Department of Kinesiology, Research Center for Movement Control and Neuroplasticity, KU Leuven, Leuven, Belgium
- Department of Health Sciences and Technology, Neural Control of Movement Laboratory, ETH Zurich, Zürich, Switzerland
- * E-mail:
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77
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Hoff M, Kaminski E, Rjosk V, Sehm B, Steele CJ, Villringer A, Ragert P. Augmenting mirror visual feedback-induced performance improvements in older adults. Eur J Neurosci 2015; 41:1475-83. [PMID: 25912048 DOI: 10.1111/ejn.12899] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 02/27/2015] [Accepted: 03/15/2015] [Indexed: 12/31/2022]
Abstract
Previous studies have indicated that age-related behavioral alterations are not irreversible but are subject to amelioration through specific training interventions. Both training paradigms and non-invasive brain stimulation (NIBS) can be used to modulate age-related brain alterations and thereby influence behavior. It has been shown that mirror visual feedback (MVF) during motor skill training improves performance of the trained and untrained hands in young adults. The question remains of whether MVF also improves motor performance in older adults and how performance improvements can be optimised via NIBS. Here, we sought to determine whether anodal transcranial direct current stimulation (a-tDCS) can be used to augment MVF-induced performance improvements in manual dexterity. We found that older adults receiving a-tDCS over the right primary motor cortex (M1) during MVF showed superior performance improvements of the (left) untrained hand relative to sham stimulation. An additional control experiment in participants receiving a-tDCS over the right M1 only (without MVF/motor training of the right hand) revealed no significant behavioral gains in the left (untrained) hand. On the basis of these findings, we propose that combining a-tDCS with MVF might be relevant for future clinical studies that aim to optimise the outcome of neurorehabilitation.
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Affiliation(s)
- Maike Hoff
- Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstrasse 1a, D-04103, Leipzig, Germany
| | - Elisabeth Kaminski
- Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstrasse 1a, D-04103, Leipzig, Germany
| | - Viola Rjosk
- Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstrasse 1a, D-04103, Leipzig, Germany
| | - Bernhard Sehm
- Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstrasse 1a, D-04103, Leipzig, Germany
| | - Christopher J Steele
- Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstrasse 1a, D-04103, Leipzig, Germany
| | - Arno Villringer
- Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstrasse 1a, D-04103, Leipzig, Germany.,Mind and Brain Institute, Charité and Humboldt University, Berlin, Germany
| | - Patrick Ragert
- Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstrasse 1a, D-04103, Leipzig, Germany.,Institute for General Kinesiology and Exercise Science, University of Leipzig, Leipzig, Germany
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78
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Parikh PJ, Cole KJ. Effects of transcranial direct current stimulation on the control of finger force during dexterous manipulation in healthy older adults. PLoS One 2015; 10:e0124137. [PMID: 25855984 PMCID: PMC4391929 DOI: 10.1371/journal.pone.0124137] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 03/03/2015] [Indexed: 11/18/2022] Open
Abstract
The contribution of poor finger force control to age-related decline in manual dexterity is above and beyond ubiquitous behavioral slowing. Altered control of the finger forces can impart unwanted torque on the object affecting its orientation, thus impairing manual performance. Anodal transcranial direct current stimulation (tDCS) over primary motor cortex (M1) has been shown to improve the performance speed on manual tasks in older adults. However, the effects of anodal tDCS over M1 on the finger force control during object manipulation in older adults remain to be fully explored. Here we determined the effects of anodal tDCS over M1 on the control of grip force in older adults while they manipulated an object with an uncertain mechanical property. Eight healthy older adults were instructed to grip and lift an object whose contact surfaces were unexpectedly made more or less slippery across trials using acetate and sandpaper surfaces, respectively. Subjects performed this task before and after receiving anodal or sham tDCS over M1 on two separate sessions using a cross-over design. We found that older adults used significantly lower grip force following anodal tDCS compared to sham tDCS. Friction measured at the finger-object interface remained invariant after anodal and sham tDCS. These findings suggest that anodal tDCS over M1 improved the control of grip force during object manipulation in healthy older adults. Although the cortical networks for representing objects and manipulative actions are complex, the reduction in grip force following anodal tDCS over M1 might be due to a cortical excitation yielding improved processing of object-specific sensory information and its integration with the motor commands for production of manipulative forces. Our findings indicate that tDCS has a potential to improve the control of finger force during dexterous manipulation in older adults.
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Affiliation(s)
- Pranav J. Parikh
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ, 85226, United States of America
- * E-mail:
| | - Kelly J. Cole
- Motor Control Laboratories, Department of Health and Human Physiology, University of Iowa, IA 52242, United States of America
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Jones KT, Stephens JA, Alam M, Bikson M, Berryhill ME. Longitudinal neurostimulation in older adults improves working memory. PLoS One 2015; 10:e0121904. [PMID: 25849358 PMCID: PMC4388845 DOI: 10.1371/journal.pone.0121904] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 02/05/2015] [Indexed: 01/09/2023] Open
Abstract
An increasing concern affecting a growing aging population is working memory (WM) decline. Consequently, there is great interest in improving or stabilizing WM, which drives expanded use of brain training exercises. Such regimens generally result in temporary WM benefits to the trained tasks but minimal transfer of benefit to untrained tasks. Pairing training with neurostimulation may stabilize or improve WM performance by enhancing plasticity and strengthening WM-related cortical networks. We tested this possibility in healthy older adults. Participants received 10 sessions of sham (control) or active (anodal, 1.5 mA) tDCS to the right prefrontal, parietal, or prefrontal/parietal (alternating) cortices. After ten minutes of sham or active tDCS, participants performed verbal and visual WM training tasks. On the first, tenth, and follow-up sessions, participants performed transfer WM tasks including the spatial 2-back, Stroop, and digit span tasks. The results demonstrated that all groups benefited from WM training, as expected. However, at follow-up 1-month after training ended, only the participants in the active tDCS groups maintained significant improvement. Importantly, this pattern was observed for both trained and transfer tasks. These results demonstrate that tDCS-linked WM training can provide long-term benefits in maintaining cognitive training benefits and extending them to untrained tasks.
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Affiliation(s)
- Kevin T. Jones
- Memory and Brain Laboratory, Department of Psychology, University of Nevada, Reno, Nevada, United States of America
- Cognitive Neuropsychology Lab, Department of Neurology, Georgetown University Medical Center, Washington, District of Columbia, United States of America
| | - Jaclyn A. Stephens
- Memory and Brain Laboratory, Department of Psychology, University of Nevada, Reno, Nevada, United States of America
| | - Mahtab Alam
- Department of Biomedical Engineering, The City College of New York, New York, New York, United States of America
| | - Marom Bikson
- Department of Biomedical Engineering, The City College of New York, New York, New York, United States of America
| | - Marian E. Berryhill
- Memory and Brain Laboratory, Department of Psychology, University of Nevada, Reno, Nevada, United States of America
- * E-mail:
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80
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Woodgate PJW, Strauss S, Sami SA, Heinke D. Motor cortex guides selection of predictable movement targets. Behav Brain Res 2015; 287:238-46. [PMID: 25835319 DOI: 10.1016/j.bbr.2015.03.057] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 03/19/2015] [Accepted: 03/23/2015] [Indexed: 11/30/2022]
Abstract
The present paper asks whether the motor cortex contributes to prediction-based guidance of target selection. This question was inspired by recent evidence that suggests (i) recurrent connections from the motor system into the attentional system may extract movement-relevant perceptual information and (ii) that the motor cortex cannot only generate predictions of the sensory consequences of movements but may also operate as predictor of perceptual events in general. To test this idea we employed a choice reaching task requiring participants to rapidly reach and touch a predictable or unpredictable colour target. Motor cortex activity was modulated via transcranial direct current stimulation (tDCS). In Experiment 1 target colour repetitions were predictable. Under such conditions anodal tDCS facilitated selection versus sham and cathodal tDCS. This improvement was apparent for trajectory curvature but not movement initiation. Conversely, where no predictability of colour was embedded reach performance was unaffected by tDCS. Finally, the results of a key-press experiment suggested that motor cortex involvement is restricted to tasks where the predictable target colour is movement-relevant. The outcomes are interpreted as evidence that the motor system contributes to the top-down guidance of selective attention to movement targets.
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Affiliation(s)
- Philip J W Woodgate
- Centre for Computational Neuroscience and Cognitive Robotics, School of Psychology, University of Birmingham, Birmingham B15 2TT, UK.
| | - Soeren Strauss
- Centre for Computational Neuroscience and Cognitive Robotics, School of Psychology, University of Birmingham, Birmingham B15 2TT, UK.
| | - Saber A Sami
- Behavioural Brain Sciences, School of Psychology, University of Birmingham, Birmingham B15 2TT, UK.
| | - Dietmar Heinke
- Centre for Computational Neuroscience and Cognitive Robotics, School of Psychology, University of Birmingham, Birmingham B15 2TT, UK.
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81
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Transcranial direct current stimulation (tDCS) – Application in neuropsychology. Neuropsychologia 2015; 69:154-75. [DOI: 10.1016/j.neuropsychologia.2015.02.002] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 01/29/2015] [Accepted: 02/02/2015] [Indexed: 12/21/2022]
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82
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Foerster Á, Rocha S, Araújo MDGR, Lemos A, Monte-Silva K. Effects of transcranial direct current stimulation on motor learning in healthy individuals: a systematic review. FISIOTERAPIA EM MOVIMENTO 2015. [DOI: 10.1590/0103-5150.028.001.ar01] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Introduction Transcranial direct current stimulation (tDCS) has been used to modify cortical excitability and promote motor learning. Objective To systematically review published data to investigate the effects of transcranial direct current stimulation on motor learning in healthy individuals. Methods Randomized or quasi-randomized studies that evaluated the tDCS effects on motor learning were included and the risk of bias was examined by Cochrane Collaboration’s tool. The following electronic databases were used: PubMed, Scopus, Web of Science, LILACS, CINAHL with no language restriction. Results It was found 160 studies; after reading the title and abstract, 17 of those were selected, but just 4 were included. All studies involved healthy, right-handed adults. All studies assessed motor learning by the Jebsen Taylor Test or by the Serial Finger Tapping Task (SFTT). Almost all studies were randomized and all were blinding for participants. Some studies presented differences at SFTT protocol. Conclusion The result is insufficient to draw conclusions if tDCS influences the motor learning. Furthermore, there was significant heterogeneity of the stimulation parameters used. Further researches are needed to investigate the parameters that are more important for motor learning improvement and measure whether the effects are long-lasting or limited in time.
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83
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Goodwill AM, Daly RM, Kidgell DJ. The effects of anodal-tDCS on cross-limb transfer in older adults. Clin Neurophysiol 2015; 126:2189-97. [PMID: 25732105 DOI: 10.1016/j.clinph.2015.01.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 10/23/2014] [Accepted: 01/11/2015] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Age-related neurodegeneration may interfere with the ability to respond to cross-limb transfer, whereby bilateral performance improvements accompany unilateral practice. We investigated whether transcranial direct current stimulation (tDCS) would facilitate this phenomena in older adults. METHODS 12 young and 12 older adults underwent unilateral visuomotor tracking (VT), with anodal or sham-tDCS over the ipsilateral motor cortex. Transcranial magnetic stimulation (TMS) assessed motor evoked potentials (MEPs) and short interval intracortical inhibition (SICI). Performance was quantified through a VT error. Variables were assessed bilaterally at baseline and post-intervention. RESULTS The trained limb improved performance, facilitated MEPs and released SICI in both age groups. In the untrained limb, VT improved in young for both sham and anodal-tDCS conditions, but only following anodal-tDCS for the older adults. MEPs increased in all conditions, except the older adult's receiving sham. SICI was released in both tDCS conditions for young and old. CONCLUSION Following a VT task, older adults still display use-dependent plasticity. Although no significant age-related differences between the outcome measures, older adults exhibited significant cross-limb transfer of performance following anodal-tDCS, which was otherwise absent following motor practice alone. SIGNIFICANCE These findings provide clinical implications for conditions restricting the use of one limb, such as stroke.
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Affiliation(s)
- Alicia M Goodwill
- Centre for Physical Activity and Nutrition Research, Deakin University, Melbourne, Australia.
| | - Robin M Daly
- Centre for Physical Activity and Nutrition Research, Deakin University, Melbourne, Australia.
| | - Dawson J Kidgell
- Department of Rehabilitation, Nutrition and Sport, La Trobe University, Melbourne, Australia.
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84
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Cohen Kadosh R. Modulating and enhancing cognition using brain stimulation: Science and fiction. JOURNAL OF COGNITIVE PSYCHOLOGY 2015. [DOI: 10.1080/20445911.2014.996569] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Koyama S, Tanaka S, Tanabe S, Sadato N. Dual-hemisphere transcranial direct current stimulation over primary motor cortex enhances consolidation of a ballistic thumb movement. Neurosci Lett 2014; 588:49-53. [PMID: 25448726 DOI: 10.1016/j.neulet.2014.11.043] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Revised: 11/03/2014] [Accepted: 11/26/2014] [Indexed: 11/30/2022]
Abstract
Transcranial direct current stimulation (tDCS) is a noninvasive technique that modulates motor performance and learning. Previous studies have shown that tDCS over the primary motor cortex (M1) can facilitate consolidation of various motor skills. However, the effect of tDCS on consolidation of newly learned ballistic movements remains unknown. The present study tested the hypothesis that tDCS over M1 enhances consolidation of ballistic thumb movements in healthy adults. Twenty-eight healthy subjects participated in an experiment with a single-blind, sham-controlled, between-group design. Fourteen subjects practiced a ballistic movement with their left thumb during dual-hemisphere tDCS. Subjects received 1mA anodal tDCS over the contralateral M1 and 1mA cathodal tDCS over the ipsilateral M1 for 25min during the training session. The remaining 14 subjects underwent identical training sessions, except that dual-hemisphere tDCS was applied for only the first 15s (sham group). All subjects performed the task again at 1h and 24h later. Primary measurements examined improvement in peak acceleration of the ballistic thumb movement at 1h and 24h after stimulation. Improved peak acceleration was significantly greater in the tDCS group (144.2±15.1%) than in the sham group (98.7±9.1%) (P<0.05) at 24h, but not 1h, after stimulation. Thus, dual-hemisphere tDCS over M1 enhanced consolidation of ballistic thumb movement in healthy adults. Dual-hemisphere tDCS over M1 may be useful to improve elemental motor behaviors, such as ballistic movements, in patients with subcortical strokes.
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Affiliation(s)
- Soichiro Koyama
- Division of Cerebral Integration, National Institute for Physiological Sciences, Aichi 444-8585, Japan; School of Life Sciences, The Graduate University for Advanced Studies, Kanagawa 240-0193, Japan; Department of Rehabilitation, Kawamura Hospital, Gifu 501-3144, Japan
| | - Satoshi Tanaka
- Laboratory of Psychology, Hamamatsu University School of Medicine, Shizuoka 431-3192, Japan.
| | - Shigeo Tanabe
- Faculty of Rehabilitation, School of Health Sciences, Fujita Health University, Aichi 470-1192, Japan
| | - Norihiro Sadato
- Division of Cerebral Integration, National Institute for Physiological Sciences, Aichi 444-8585, Japan; School of Life Sciences, The Graduate University for Advanced Studies, Kanagawa 240-0193, Japan
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86
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Tremblay S, Beaulé V, Proulx S, Lafleur LP, Doyon J, Marjańska M, Théoret H. The use of magnetic resonance spectroscopy as a tool for the measurement of bi-hemispheric transcranial electric stimulation effects on primary motor cortex metabolism. J Vis Exp 2014:e51631. [PMID: 25490453 DOI: 10.3791/51631] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Transcranial direct current stimulation (tDCS) is a neuromodulation technique that has been increasingly used over the past decade in the treatment of neurological and psychiatric disorders such as stroke and depression. Yet, the mechanisms underlying its ability to modulate brain excitability to improve clinical symptoms remains poorly understood. To help improve this understanding, proton magnetic resonance spectroscopy ((1)H-MRS) can be used as it allows the in vivo quantification of brain metabolites such as γ-aminobutyric acid (GABA) and glutamate in a region-specific manner. In fact, a recent study demonstrated that (1)H-MRS is indeed a powerful means to better understand the effects of tDCS on neurotransmitter concentration. This article aims to describe the complete protocol for combining tDCS (NeuroConn MR compatible stimulator) with (1)H-MRS at 3 T using a MEGA-PRESS sequence. We will describe the impact of a protocol that has shown great promise for the treatment of motor dysfunctions after stroke, which consists of bilateral stimulation of primary motor cortices. Methodological factors to consider and possible modifications to the protocol are also discussed.
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Affiliation(s)
| | | | | | | | - Julien Doyon
- Department of Psychology, University of Montréal
| | - Małgorzata Marjańska
- Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota;
| | - Hugo Théoret
- Department of Psychology, University of Montréal;
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87
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Perez C, Morales-Quezada L, Fregni F. A combined therapeutic approach in stroke rehabilitation: A review on non-invasive brain stimulation plus pharmacotherapy. ACTA ACUST UNITED AC 2014; 1. [PMID: 28317024 DOI: 10.4172/2376-0281.1000123] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Stroke is a leading cause of disability in the United States. Available treatments for stroke have only a modest effect on motor rehabilitation and about 50-60% of stroke patients remain with some degree of motor impairment after standard treatment. Non-invasive brain stimulation (NIBS) techniques have been proposed as adjuvant treatments to physical therapy for motor recovery after stroke. High frequency rTMS and anodal tDCS can be delivered over the affected motor cortex in order to increase cortical excitability and induce brain plasticity with the intention to enhance motor learning and achieve functional goals in stroke patients. Similarly, low frequency rTMS and cathodal tDCS can be delivered to the unaffected motor cortex to reduce interhemispheric inhibition and hinder maladaptive plasticity. The use of several drugs such as amphetamines, selective serotonin reuptake inhibitors (SSRIs), levodopa and cholinergic agents have been also proposed to enhance the motor function. Given that both NIBS and pharmacotherapy might provide some treatment effect independently for motor rehabilitation in stroke and with the rationale that they could work in a synergistic fashion, we believe that a combined therapy- NIBS plus pharmacotherapy- canlead to better outcomes than one or the other alone. In this paper we review the literature that support the potential use of a combined approach in stroke recovery and present the studies that have already investigated this idea.
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Affiliation(s)
- Carolina Perez
- Laboratory of Neuromodulation, Spaulding Rehabilitation Hospital, Boston, MA
| | | | - Felipe Fregni
- Laboratory of Neuromodulation, Spaulding Rehabilitation Hospital, Boston, MA; Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA, USA
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88
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de Xivry JJO, Shadmehr R. Electrifying the motor engram: effects of tDCS on motor learning and control. Exp Brain Res 2014; 232:3379-95. [PMID: 25200178 PMCID: PMC4199902 DOI: 10.1007/s00221-014-4087-6] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 08/26/2014] [Indexed: 01/08/2023]
Abstract
Learning to control our movements is accompanied by neuroplasticity of motor areas of the brain. The mechanisms of neuroplasticity are diverse and produce what is referred to as the motor engram, i.e., the neural trace of the motor memory. Transcranial direct current stimulation (tDCS) alters the neural and behavioral correlates of motor learning, but its precise influence on the motor engram is unknown. In this review, we summarize the effects of tDCS on neural activity and suggest a few key principles: (1) Firing rates are increased by anodal polarization and decreased by cathodal polarization, (2) anodal polarization strengthens newly formed associations, and (3) polarization modulates the memory of new/preferred firing patterns. With these principles in mind, we review the effects of tDCS on motor control, motor learning, and clinical applications. The increased spontaneous and evoked firing rates may account for the modulation of dexterity in non-learning tasks by tDCS. The facilitation of new association may account for the effect of tDCS on learning in sequence tasks while the ability of tDCS to strengthen memories of new firing patterns may underlie the effect of tDCS on consolidation of skills. We then describe the mechanisms of neuroplasticity of motor cortical areas and how they might be influenced by tDCS. We end with current challenges for the fields of brain stimulation and motor learning.
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Affiliation(s)
- Jean-Jacques Orban de Xivry
- Institute of Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM) and Institute of Neuroscience (IoNS), Université catholique de Louvain, Louvain-La-Neuve, Belgium
| | - Reza Shadmehr
- Laboratory for Computational Motor Control, Department of Biomedical Engineering Johns Hopkins School of Medicine, Baltimore, MD, USA
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89
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Within-session repeated a-tDCS: The effects of repetition rate and inter-stimulus interval on corticospinal excitability and motor performance. Clin Neurophysiol 2014; 125:1809-18. [DOI: 10.1016/j.clinph.2014.01.010] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 01/17/2014] [Accepted: 01/18/2014] [Indexed: 11/20/2022]
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90
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Heise KF, Niehoff M, Feldheim JF, Liuzzi G, Gerloff C, Hummel FC. Differential behavioral and physiological effects of anodal transcranial direct current stimulation in healthy adults of younger and older age. Front Aging Neurosci 2014; 6:146. [PMID: 25071555 PMCID: PMC4091308 DOI: 10.3389/fnagi.2014.00146] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Accepted: 06/16/2014] [Indexed: 01/19/2023] Open
Abstract
Changes in γ-aminobutyric acid (GABA) mediated synaptic transmission have been associated with age-related motor and cognitive functional decline. Since anodal transcranial direct current stimulation (atDCS) has been suggested to target cortical GABAergic inhibitory interneurons, its potential for the treatment of deficient inhibitory activity and functional decline is being increasingly discussed. Therefore, after-effects of a single session of atDCS on resting-state and event-related short-interval intracortical inhibition (SICI) as evaluated with double-pulse TMS and dexterous manual performance were examined using a sham-controlled cross-over design in a sample of older and younger participants. The atDCS effect on resting-state inhibition differed in direction, magnitude, and timing, i.e., late relative release of inhibition in the younger and early relative increase in inhibition in the older. More pronounced release of event-related inhibition after atDCS was exclusively seen in the older. Event-related modulation of inhibition prior to stimulation predicted the magnitude of atDCS-induced effects on resting-state inhibition. Specifically, older participants with high modulatory capacity showed a disinhibitory effect comparable to the younger. Beneficial effects on behavior were mainly seen in the older and in tasks requiring higher dexterity, no clear association with physiological changes was found. Differential effects of atDCS on SICI, discussed to reflect GABAergic inhibition at the level of the primary motor cortex, might be distinct in older and younger participants depending on the functional integrity of the underlying neural network. Older participants with preserved modulatory capacity, i.e., a physiologically “young” motor network, were more likely to show a disinhibitory effect of atDCS. These results favor individually tailored application of tDCS with respect to specific target groups.
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Affiliation(s)
- Kirstin-Friederike Heise
- Brain Imaging and Neurostimulation (BINS) Laboratory, Department of Neurology, University Medical Center Hamburg-Eppendorf Hamburg, Germany
| | - Martina Niehoff
- Brain Imaging and Neurostimulation (BINS) Laboratory, Department of Neurology, University Medical Center Hamburg-Eppendorf Hamburg, Germany
| | - J-F Feldheim
- Brain Imaging and Neurostimulation (BINS) Laboratory, Department of Neurology, University Medical Center Hamburg-Eppendorf Hamburg, Germany
| | - Gianpiero Liuzzi
- Brain Imaging and Neurostimulation (BINS) Laboratory, Department of Neurology, University Medical Center Hamburg-Eppendorf Hamburg, Germany ; Department of Neurology, University Hospital Zürich Zürich, Switzerland
| | - Christian Gerloff
- Brain Imaging and Neurostimulation (BINS) Laboratory, Department of Neurology, University Medical Center Hamburg-Eppendorf Hamburg, Germany
| | - Friedhelm C Hummel
- Brain Imaging and Neurostimulation (BINS) Laboratory, Department of Neurology, University Medical Center Hamburg-Eppendorf Hamburg, Germany
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91
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Zhang X, Woolley DG, Swinnen SP, Feys H, Meesen R, Wenderoth N. Changes in corticomotor excitability and intracortical inhibition of the primary motor cortex forearm area induced by anodal tDCS. PLoS One 2014; 9:e101496. [PMID: 24999827 PMCID: PMC4084808 DOI: 10.1371/journal.pone.0101496] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 06/06/2014] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVE Previous studies have investigated how tDCS over the primary motor cortex modulates excitability in the intrinsic hand muscles. Here, we tested if tDCS changes corticomotor excitability and/or cortical inhibition when measured in the extensor carpi radialis (ECR) and if these aftereffects can be successfully assessed during controlled muscle contraction. METHODS We implemented a double blind cross-over design in which participants (n = 16) completed two sessions where the aftereffects of 20 min of 1 mA (0.04 mA/cm2) anodal vs sham tDCS were tested in a resting muscle, and two more sessions where the aftereffects of anodal vs sham tDCS were tested in an active muscle. RESULTS Anodal tDCS increased corticomotor excitability in ECR when aftereffects were measured with a low-level controlled muscle contraction. Furthermore, anodal tDCS decreased short interval intracortical inhibition but only when measured at rest and after non-responders (n = 2) were removed. We found no changes in the cortical silent period. CONCLUSION These findings suggest that targeting more proximal muscles in the upper limb with anodal tDCS is achievable and corticomotor excitability can be assessed in the presence of a low-level controlled contraction of the target muscle.
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Affiliation(s)
- Xue Zhang
- Motor Control Laboratory, Movement Control and Neuroplasticity Research Group, Department of Kinesiology, KU Leuven, Leuven, Belgium
| | - Daniel G. Woolley
- Motor Control Laboratory, Movement Control and Neuroplasticity Research Group, Department of Kinesiology, KU Leuven, Leuven, Belgium
| | - Stephan P. Swinnen
- Motor Control Laboratory, Movement Control and Neuroplasticity Research Group, Department of Kinesiology, KU Leuven, Leuven, Belgium
| | - Hilde Feys
- Research Group for Neuromotor Rehabilitation, Department of Rehabilitation Sciences, KU Leuven, Leuven, Belgium
| | - Raf Meesen
- Motor Control Laboratory, Movement Control and Neuroplasticity Research Group, Department of Kinesiology, KU Leuven, Leuven, Belgium
- REVAL Rehabilitation Research Centre, Biomedical Research Institute, Hasselt University, Hasselt, Belgium
| | - Nicole Wenderoth
- Motor Control Laboratory, Movement Control and Neuroplasticity Research Group, Department of Kinesiology, KU Leuven, Leuven, Belgium
- Neural Control of Movement Laboratory, Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland
- * E-mail:
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92
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Butts RJ, Kolar MB, Newman-Norlund RD. Enhanced motor skill acquisition in the non-dominant upper extremity using intermittent theta burst stimulation and transcranial direct current stimulation. Front Hum Neurosci 2014; 8:451. [PMID: 25002842 PMCID: PMC4066858 DOI: 10.3389/fnhum.2014.00451] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 06/03/2014] [Indexed: 11/17/2022] Open
Abstract
Individuals suffering from motor impairments often require physical therapy (PT) to help improve their level of function. Previous investigations suggest that both intermittent theta burst stimulation (iTBS) and bihemispheric transcranial direct current stimulation (tDCS) may increase the speed and extent of motor learning/relearning. The purpose of the current study was to explore the feasibility and effectiveness of a novel, non-invasive brain stimulation approach that combined an iTBS primer, and bihemispheric stimulation coupled with motor training. We hypothesized that individuals exposed to this novel treatment would make greater functional improvements than individuals undergoing sham stimulation when tested immediately following, 24-h, and 7-days post-training. A total of 26 right-handed, healthy young adults were randomly assigned to either a treatment (n = 15) or control group (n = 12). iTBS (20 trains of 10 pulse triplets each delivered at 80% active motor threshold (AMT) / 50 Hz over 191.84 s) and bihemispheric tDCS (1.0 ma for 20 min) were used as a primer to, and in conjunction with, 20 min of motor training, respectively. Our primary outcome measure was performance on the Jebsen-Taylor Hand Function (JTHF) test. Participants tolerated the combined iTBS/bihemispheric stimulation treatment without complaint. While performance gains in the sham and stimulation group were not significant immediately after training, they were nearly significant 24-h post training (p = 0.055), and were significant at 7-days post training (p < 0.05). These results suggest that the combined iTBS/bihemispheric stimulation protocol is both feasible and effective. Future research should examine the mechanistic explanation of this approach as well as the potential of using this approach in clinical populations.
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Affiliation(s)
- Raymond J Butts
- Department of Exercise Science, Arnold School of Public Health, University of South Carolina Columbia, SC, USA
| | - Melissa B Kolar
- Department of Exercise Science, Arnold School of Public Health, University of South Carolina Columbia, SC, USA
| | - Roger D Newman-Norlund
- Department of Exercise Science, Arnold School of Public Health, University of South Carolina Columbia, SC, USA
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93
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Fujiyama H, Hyde J, Hinder MR, Kim SJ, McCormack GH, Vickers JC, Summers JJ. Delayed plastic responses to anodal tDCS in older adults. Front Aging Neurosci 2014; 6:115. [PMID: 24936185 PMCID: PMC4047559 DOI: 10.3389/fnagi.2014.00115] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 05/22/2014] [Indexed: 11/24/2022] Open
Abstract
Despite the abundance of research reporting the neurophysiological and behavioral effects of transcranial direct current stimulation (tDCS) in healthy young adults and clinical populations, the extent of potential neuroplastic changes induced by tDCS in healthy older adults is not well understood. The present study compared the extent and time course of anodal tDCS-induced plastic changes in primary motor cortex (M1) in young and older adults. Furthermore, as it has been suggested that neuroplasticity and associated learning depends on the brain-derived neurotrophic factor (BDNF) gene polymorphisms, we also assessed the impact of BDNF polymorphism on these effects. Corticospinal excitability was examined using transcranial magnetic stimulation before and following (0, 10, 20, 30 min) anodal tDCS (30 min, 1 mA) or sham in young and older adults. While the overall extent of increases in corticospinal excitability induced by anodal tDCS did not vary reliably between young and older adults, older adults exhibited a delayed response; the largest increase in corticospinal excitability occurred 30 min following stimulation for older adults, but immediately post-stimulation for the young group. BDNF genotype did not result in significant differences in the observed excitability increases for either age group. The present study suggests that tDCS-induced plastic changes are delayed as a result of healthy aging, but that the overall efficacy of the plasticity mechanism remains unaffected.
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Affiliation(s)
- Hakuei Fujiyama
- Human Motor Control Laboratory, School of Medicine, University of Tasmania Hobart, TAS, Australia ; Movement Control and Neuroplasticity Research Group, Department of Kinesiology KU Leuven, Leuven, Belgium
| | - Jane Hyde
- Human Motor Control Laboratory, School of Medicine, University of Tasmania Hobart, TAS, Australia
| | - Mark R Hinder
- Human Motor Control Laboratory, School of Medicine, University of Tasmania Hobart, TAS, Australia
| | - Seok-Jin Kim
- Human Motor Control Laboratory, School of Medicine, University of Tasmania Hobart, TAS, Australia ; Motor Behavior Laboratory, Department of Physical Education, Seoul National University Seoul, South Korea
| | - Graeme H McCormack
- Wicking Dementia Research and Education Centre, University of Tasmania Hobart, TAS, Australia
| | - James C Vickers
- Wicking Dementia Research and Education Centre, University of Tasmania Hobart, TAS, Australia
| | - Jeffery J Summers
- Human Motor Control Laboratory, School of Medicine, University of Tasmania Hobart, TAS, Australia ; Research Institute for Sport and Exercise Sciences, Liverpool John Moores University Liverpool, UK
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Inter- and Intra-individual Variability Following Intermittent Theta Burst Stimulation: Implications for Rehabilitation and Recovery. Brain Stimul 2014; 7:365-71. [DOI: 10.1016/j.brs.2014.01.004] [Citation(s) in RCA: 134] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 01/03/2014] [Accepted: 01/04/2014] [Indexed: 11/30/2022] Open
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95
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Levin O, Fujiyama H, Boisgontier MP, Swinnen SP, Summers JJ. Aging and motor inhibition: a converging perspective provided by brain stimulation and imaging approaches. Neurosci Biobehav Rev 2014; 43:100-17. [PMID: 24726575 DOI: 10.1016/j.neubiorev.2014.04.001] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 03/18/2014] [Accepted: 04/02/2014] [Indexed: 10/25/2022]
Abstract
The ability to inhibit actions, one of the hallmarks of human motor control, appears to decline with advancing age. Evidence for a link between changes in inhibitory functions and poor motor performance in healthy older adults has recently become available with transcranial magnetic stimulation (TMS). Overall, these studies indicate that the capacity to modulate intracortical (ICI) and interhemispheric (IHI) inhibition is preserved in high-performing older individuals. In contrast, older individuals exhibiting motor slowing and a declined ability to coordinate movement appear to show a reduced capability to modulate GABA-mediated inhibitory processes. As a decline in the integrity of the GABA-ergic inhibitory processes may emerge due to age-related loss of white and gray matter, a promising direction for future research would be to correlate individual differences in structural and/or functional integrity of principal brain networks with observed changes in inhibitory processes within cortico-cortical, interhemispheric, and/or corticospinal pathways. Finally, we underscore the possible links between reduced inhibitory functions and age-related changes in brain activation patterns.
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Affiliation(s)
- Oron Levin
- KU Leuven Movement Control and Neuroplasticity Research Group, Department of Kinesiology, Group Biomedical Sciences, 3001 Leuven, Belgium.
| | - Hakuei Fujiyama
- KU Leuven Movement Control and Neuroplasticity Research Group, Department of Kinesiology, Group Biomedical Sciences, 3001 Leuven, Belgium; Human Motor Control Laboratory, School of Psychology, University of Tasmania, Australia
| | - Matthieu P Boisgontier
- KU Leuven Movement Control and Neuroplasticity Research Group, Department of Kinesiology, Group Biomedical Sciences, 3001 Leuven, Belgium
| | - Stephan P Swinnen
- KU Leuven Movement Control and Neuroplasticity Research Group, Department of Kinesiology, Group Biomedical Sciences, 3001 Leuven, Belgium; KU Leuven, Leuven Research Institute for Neuroscience & Disease (LIND), 3001 Leuven, Belgium
| | - Jeffery J Summers
- Human Motor Control Laboratory, School of Psychology, University of Tasmania, Australia; Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool L3 5UX United Kingdom
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96
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Hardwick RM, Celnik PA. Cerebellar direct current stimulation enhances motor learning in older adults. Neurobiol Aging 2014; 35:2217-21. [PMID: 24792908 DOI: 10.1016/j.neurobiolaging.2014.03.030] [Citation(s) in RCA: 110] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Revised: 03/23/2014] [Accepted: 03/25/2014] [Indexed: 11/24/2022]
Abstract
Developing novel approaches to combat age related declines in motor function is key to maintaining health and function in older adults, a subgroup of the population that is rapidly growing. Motor adaptation, a form of motor learning, has been shown to be impaired in healthy older subjects compared with their younger counterparts. Here, we tested whether excitatory anodal transcranial direct current stimulation (tDCS) over the cerebellum could enhance adaptation in older subjects. Participants performed a "center-out" reaching task, adapting to the sudden introduction of a visual cursor rotation. Older participants receiving sham tDCS (mean age 56.3 ± 6.8 years) were slower to adapt than younger participants (mean age 20.7 ± 2.1 years). In contrast, older participants who received anodal tDCS (mean age 59.6 ± 8.1 years) adapted faster, with a rate that was similar to younger subjects. We conclude that cerebellar anodal tDCS enhances motor adaptation in older individuals. Our results highlight the efficacy of the novel approach of using cerebellar tDCS to combat age related deficits in motor learning.
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Affiliation(s)
- Robert M Hardwick
- Department of Physical Medicine and Rehabilitation, Johns Hopkins University, Baltimore, MD, USA
| | - Pablo A Celnik
- Department of Physical Medicine and Rehabilitation, Johns Hopkins University, Baltimore, MD, USA; Department of Neurology, Johns Hopkins University, Baltimore, MD, USA.
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97
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Parikh PJ, Cole KJ. Effects of transcranial direct current stimulation in combination with motor practice on dexterous grasping and manipulation in healthy older adults. Physiol Rep 2014; 2:e00255. [PMID: 24760509 PMCID: PMC4002235 DOI: 10.1002/phy2.255] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Abstract Transcranial anodal stimulation (tDCS) over primary motor cortex (M1) improves dexterous manipulation in healthy older adults. However, the beneficial effects of anodal tDCS in combination with motor practice on natural and clinically relevant functional manual tasks, and the associated changes in the digit contact forces are not known. To this end, we studied the effects of 20 min of tDCS applied over M1 for the dominant hand combined with motor practice (MP) in a sham-controlled crossover study. We monitored the forces applied to an object that healthy elderly individuals grasped and manipulated, and their performances on the Grooved Pegboard Test and the Key-slot task. Practice improved performance on the Pegboard test, and anodal tDCS + MP improved retention of this performance gain when tested 35 min later, whereas similar performance gains degraded in the sham group after 35 min. Interestingly, grip force variability on an isometric precision grip task performed with visual feedback of precision force increased following anodal tDCS + MP, but not sham tDCS + MP. This finding suggests that anodal tDCS over M1 might alter the descending drive to spinal motor neurons involved in the performance of isometric precision grip task under visual feedback leading to increased fluctuations in the grip force exerted on the object. Our results demonstrate that anodal stimulation in combination with motor practice helps older adults to retain their improved performance on a functionally relevant manual task in healthy older adults.
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Affiliation(s)
- Pranav J Parikh
- Motor Control Laboratories, Department of Health and Human Physiology, University of Iowa, Iowa City, 52242, Iowa
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98
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Meinzer M, Jähnigen S, Copland DA, Darkow R, Grittner U, Avirame K, Rodriguez AD, Lindenberg R, Flöel A. Transcranial direct current stimulation over multiple days improves learning and maintenance of a novel vocabulary. Cortex 2014; 50:137-47. [PMID: 23988131 DOI: 10.1016/j.cortex.2013.07.013] [Citation(s) in RCA: 116] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2013] [Revised: 07/23/2013] [Accepted: 07/23/2013] [Indexed: 11/18/2022]
Affiliation(s)
- Marcus Meinzer
- Department of Neurology, Charité University Medicine, Berlin, Germany; Center for Stroke Research, Charité University Medicine, Berlin, Germany; Center for Clinical Research, University of Queensland, Brisbane, Australia.
| | - Sophia Jähnigen
- Department of Neurology, Charité University Medicine, Berlin, Germany
| | - David A Copland
- Center for Clinical Research, University of Queensland, Brisbane, Australia; CCRE in Aphasia Rehabilitation, University of Queensland, Brisbane, Australia
| | - Robert Darkow
- Department of Neurology, Charité University Medicine, Berlin, Germany
| | - Ulrike Grittner
- Center for Stroke Research, Charité University Medicine, Berlin, Germany; Department for Biostatistics and Clinical Epidemiology, Charité University Medicine, Berlin, Germany
| | - Keren Avirame
- Department of Neurology, Charité University Medicine, Berlin, Germany
| | - Amy D Rodriguez
- Center for Clinical Research, University of Queensland, Brisbane, Australia; CCRE in Aphasia Rehabilitation, University of Queensland, Brisbane, Australia
| | - Robert Lindenberg
- Department of Neurology, Charité University Medicine, Berlin, Germany
| | - Agnes Flöel
- Department of Neurology, Charité University Medicine, Berlin, Germany; Center for Stroke Research, Charité University Medicine, Berlin, Germany; NeuroCure Cluster of Excellence, Charité University Medicine, Berlin, Germany.
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99
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Soekadar SR, Witkowski M, Cossio EG, Birbaumer N, Robinson SE, Cohen LG. In vivo assessment of human brain oscillations during application of transcranial electric currents. Nat Commun 2013; 4:2032. [PMID: 23787780 PMCID: PMC4892116 DOI: 10.1038/ncomms3032] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2012] [Accepted: 05/17/2013] [Indexed: 01/12/2023] Open
Abstract
Brain oscillations reflect pattern formation of cell assemblies’ activity, which is often disturbed in neurological and psychiatric diseases like depression, schizophrenia and stroke. In the neurobiological analysis and treatment of these conditions, transcranial electric currents applied to the brain proved beneficial. However, the direct effects of these currents on brain oscillations have remained an enigma because of the inability to record them simultaneously. Here we report a novel strategy that resolves this problem. We describe accurate reconstructed localization of dipolar sources and changes of brain oscillatory activity associated with motor actions in primary cortical brain regions undergoing transcranial electric stimulation. This new method allows for the first time direct measurement of the effects of non-invasive electrical brain stimulation on brain oscillatory activity and behavior.
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Affiliation(s)
- Surjo R Soekadar
- Human Cortical Physiology and Stroke Neurorehabilitation Section, National Institute of Neurological Disorders and Stroke, NIH, 10 Center Drive, Building 10, Bethesda, Maryland 20892, USA.
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100
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Goodwill AM, Reynolds J, Daly RM, Kidgell DJ. Formation of cortical plasticity in older adults following tDCS and motor training. Front Aging Neurosci 2013; 5:87. [PMID: 24367333 PMCID: PMC3854104 DOI: 10.3389/fnagi.2013.00087] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 11/19/2013] [Indexed: 02/04/2023] Open
Abstract
Neurodegeneration accompanies the process of natural aging, reducing the ability to perform functional daily activities. Transcranial direct current stimulation (tDCS) alters neuronal excitability and motor performance; however its beneficial effect on the induction of primary motor cortex (M1) plasticity in older adults is unclear. Moreover, little is known as to whether the tDCS electrode arrangement differentially affects M1 plasticity and motor performance in this population. In a double-blinded, cross-over trial, we compared unilateral, bilateral and sham tDCS combined with visuomotor tracking, on M1 plasticity and motor performance of the non-dominant upper limb, immediately post and 30 min following stimulation. We found (a) unilateral and bilateral tDCS decreased tracking error by 12–22% at both time points; with sham decreasing tracking error by 10% at 30 min only, (b) at both time points, motor evoked potentials (MEPs) were facilitated (38–54%) and short-interval intracortical inhibition was released (21–36%) for unilateral and bilateral conditions relative to sham, (c) there were no differences between unilateral and bilateral conditions for any measure. These findings suggest that tDCS modulated elements of M1 plasticity, which improved motor performance irrespective of the electrode arrangement. The results provide preliminary evidence indicating that tDCS is a safe non-invasive tool to preserve or improve neurological function and motor control in older adults.
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Affiliation(s)
- Alicia M Goodwill
- Centre for Physical Activity and Nutrition Research, Deakin University Melbourne, Australia
| | - John Reynolds
- Biostatistics Unit, Faculty of Health, Deakin University Melbourne, Australia
| | - Robin M Daly
- Centre for Physical Activity and Nutrition Research, Deakin University Melbourne, Australia
| | - Dawson J Kidgell
- Centre for Physical Activity and Nutrition Research, Deakin University Melbourne, Australia
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