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Suñol M, Dudley J, Payne MF, Tong H, Ting TV, Kashikar-Zuck S, Coghill RC, López-Solà M. Reduced Cortico-Cortical Resting-State Connectivity in Sensory Systems Related to Bodily Pain in Juvenile Fibromyalgia. Arthritis Rheumatol 2024; 76:293-303. [PMID: 37661912 PMCID: PMC10841360 DOI: 10.1002/art.42691] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 08/08/2023] [Accepted: 08/29/2023] [Indexed: 09/05/2023]
Abstract
OBJECTIVE Juvenile-onset fibromyalgia (JFM) is a paradigmatic chronic pain condition for which the underlying neurobiological substrates are poorly understood. This study examined, for the first time, data-driven resting-state functional connectivity (rsFC) alterations in 37 female adolescents with JFM compared with 43 healthy female adolescents and identified associations with bodily pain. METHODS Whole-brain voxel-wise rsFC alterations were assessed using the intrinsic connectivity contrast, a measure of node centrality at each voxel, and seed-based analyses for interpretability. We studied the relationship between rsFC alterations in somatosensory systems and the location and extension of bodily pain. RESULTS Adolescents with JFM had voxel-wise rsFC reductions in the paracentral lobule (PCL)/primary somatosensory cortex (S1) (T = 4.89, family-wise error corrected p-value (pFWE) < 0.001) and left midcingulate cortex (T = 4.67, pFWE = 0.043). Post hoc analyses revealed reduced rsFC spanning major cortical sensory hubs (T > 4.4, pFWE < 0.030). Cortico-cortical rsFC reductions within PCL/S1 in JFM occurred in locations innervated by bodily areas where the pain was most frequent (F = 3.15; positive false discovery rate = 0.029) and predicted widespread pain (T > 4.4, pFWE < 0.045). Conversely, adolescents with JFM had increases in PCL/S1-thalamus (T = 4.75, pFWE = 0.046) and PCL/S1-anterior insula rsFC (T = 5.13, pFWE = 0.039). CONCLUSION Reduced cortico-cortical sensory integration involving PCL/S1 and spanning the sensory systems may underly critical pain sensory features in youth with JFM. Reduced sensory integration is paralleled by augmented cross-talk between sensory and affective/salience-processing regions, potentially indicating a shift toward more affectively colored sensory experiences to the detriment of specific sensory discrimination.
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Affiliation(s)
- Maria Suñol
- Institute of Neurosciences, Department of Medicine, School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
| | - Jon Dudley
- Pediatric Neuroimaging Research Consortium, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
| | - Michael F. Payne
- Division of Behavioral Medicine and Clinical Psychology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
| | - Han Tong
- Division of Behavioral Medicine and Clinical Psychology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
- Neuroscience Graduate Program, University of Cincinnati College of Medicine, Cincinnati, OH, USA
- Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, IL, USA
| | - Tracy V. Ting
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
- Division of Rheumatology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
| | - Susmita Kashikar-Zuck
- Division of Behavioral Medicine and Clinical Psychology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
- Pediatric Pain Research Center, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
| | - Robert C. Coghill
- Division of Behavioral Medicine and Clinical Psychology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
- Pediatric Pain Research Center, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
| | - Marina López-Solà
- Institute of Neurosciences, Department of Medicine, School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
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Black CJ, Saab CY, Borton DA. Transient gamma events delineate somatosensory modality in S1. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.30.534945. [PMID: 37034800 PMCID: PMC10081264 DOI: 10.1101/2023.03.30.534945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Gamma band activity localized to the primary somatosensory cortex (S1) in humans and animals is implicated in the higher order neural processing of painful and tactile stimuli. However, it is unclear if gamma band activity differs between these distinct somatosensory modalities. Here, we coupled a novel behavioral approach with chronic extracellular electrophysiology to investigate differences in S1 gamma band activity elicited by noxious and innocuous hind paw stimulation in transgenic mice. Like prior studies, we found that trial-averaged gamma power in S1 increased following both noxious and innocuous stimuli. However, on individual trials, we noticed that evoked gamma band activity was not a continuous oscillatory signal but a series of transient spectral events. Upon further analysis we found that there was a significantly higher incidence of these gamma band events following noxious stimulation than innocuous stimulation. These findings suggest that somatosensory stimuli may be represented by specific features of gamma band activity at the single trial level, which may provide insight to mechanisms underlying acute pain.
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Pai J, Ogasawara T, Bromberg-Martin ES, Ogasawara K, Gereau RW, Monosov IE. Laser stimulation of the skin for quantitative study of decision-making and motivation. CELL REPORTS METHODS 2022; 2:100296. [PMID: 36160041 PMCID: PMC9499993 DOI: 10.1016/j.crmeth.2022.100296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 06/26/2022] [Accepted: 08/22/2022] [Indexed: 11/20/2022]
Abstract
Neuroeconomics studies how decision-making is guided by the value of rewards and punishments. But to date, little is known about how noxious experiences impact decisions. A challenge is the lack of an aversive stimulus that is dynamically adjustable in intensity and location, readily usable over many trials in a single experimental session, and compatible with multiple ways to measure neuronal activity. We show that skin laser stimulation used in human studies of aversion can be used for this purpose in several key animal models. We then use laser stimulation to study how neurons in the orbitofrontal cortex (OFC), an area whose many roles include guiding decisions among different rewards, encode the value of rewards and punishments. We show that some OFC neurons integrated the positive value of rewards with the negative value of aversive laser stimulation, suggesting that the OFC can play a role in more complex choices than previously appreciated.
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Affiliation(s)
- Julia Pai
- Department of Neuroscience, Washington University School of Medicine, St. Louis, MO, USA
| | - Takaya Ogasawara
- Department of Neuroscience, Washington University School of Medicine, St. Louis, MO, USA
| | | | - Kei Ogasawara
- Department of Neuroscience, Washington University School of Medicine, St. Louis, MO, USA
| | - Robert W. Gereau
- Department of Neuroscience, Washington University School of Medicine, St. Louis, MO, USA
- Washington University Pain Center, Washington University, St. Louis, MO, USA
- Department of Anesthesiology, Washington University School of Medicine, St. Louis, MO, USA
- Department of Biomedical Engineering, Washington University, St. Louis, MO, USA
| | - Ilya E. Monosov
- Department of Neuroscience, Washington University School of Medicine, St. Louis, MO, USA
- Washington University Pain Center, Washington University, St. Louis, MO, USA
- Department of Biomedical Engineering, Washington University, St. Louis, MO, USA
- Department of Neurosurgery, Washington University, St. Louis, MO, USA
- Department of Electrical Engineering, Washington University, St. Louis, MO, USA
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4
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Sasaki R, Watanabe H, Onishi H. Therapeutic benefits of noninvasive somatosensory cortex stimulation on cortical plasticity and somatosensory function: a systematic review. Eur J Neurosci 2022; 56:4669-4698. [PMID: 35804487 DOI: 10.1111/ejn.15767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 05/23/2022] [Accepted: 06/09/2022] [Indexed: 11/28/2022]
Abstract
Optimal limb coordination requires efficient transmission of somatosensory information to the sensorimotor cortex. The primary somatosensory cortex (S1) is frequently damaged by stroke, resulting in both somatosensory and motor impairments. Noninvasive brain stimulation (NIBS) to the primary motor cortex is thought to induce neural plasticity that facilitates neurorehabilitation. Several studies have also examined if NIBS to the S1 can enhance somatosensory processing as assessed by somatosensory-evoked potentials (SEPs) and improve behavioral task performance, but it remains uncertain if NIBS can reliably modulate S1 plasticity or even whether SEPs can reflect this plasticity. This systematic review revealed that NIBS has relatively minor effects on SEPs or somatosensory task performance, but larger early SEP changes after NIBS can still predict improved performance. Similarly, decreased paired-pulse inhibition in S1 post-NIBS is associated with improved somatosensory performance. However, several studies still debate the role of inhibitory function in somatosensory performance after NIBS in terms of the direction of the change (that, disinhibition or inhibition). Altogether, early SEP and paired-pulse inhibition (particularly inter-stimulus intervals of 30-100 ms) may become useful biomarkers for somatosensory deficits, but improved NIBS protocols are required for therapeutic applications.
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Affiliation(s)
- Ryoki Sasaki
- Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Japan.,Discipline of Physiology, School of Biomedicine, The University of Adelaide, Adelaide, Australia
| | - Hiraku Watanabe
- Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Japan.,Department of Physical Therapy, Niigata University of Health and Welfare, Niigata, Japan
| | - Hideaki Onishi
- Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Japan.,Department of Physical Therapy, Niigata University of Health and Welfare, Niigata, Japan
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Fabig SC, Kersebaum D, Lassen J, Sendel M, Jendral S, Muntean A, Baron R, Hüllemann P. A modality-specific somatosensory evoked potential test protocol for clinical evaluation: A feasibility study. Clin Neurophysiol 2021; 132:3104-3115. [PMID: 34740042 DOI: 10.1016/j.clinph.2021.08.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 07/26/2021] [Accepted: 08/29/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVE We aimed to establish an objective neurophysiological test protocol that can be used to assess the somatosensory nervous system. METHODS In order to assess most fiber subtypes of the somatosensory nervous system, repetitive stimuli of seven different modalities (touch, vibration, pinprick, cold, contact heat, laser, and warmth) were synchronized with the electroencephalogram (EEG) and applied on the cheek and dorsum of the hand and dorsum of the foot in 21 healthy subjects and three polyneuropathy (PNP) patients. Latencies and amplitudes of the modalities were assessed and compared. Patients received quantitative sensory testing (QST) as reference. RESULTS We found reproducible evoked potentials recordings for touch, vibration, pinprick, contact-heat, and laser stimuli. The recording of warm-evoked potentials was challenging in young healthy subjects and not applicable in patients. Latencies were shortest within Aβ-fiber-mediated signals and longest within C-fibers. The test protocol detected function loss within the Aβ-fiber and Aδ-fiber-range in PNP patients. This function loss corresponded with QST findings. CONCLUSION In this pilot study, we developed a neurophysiological test protocol that can specifically assess most of the somatosensory modalities. Despite technical challenges, initial patient data appear promising regarding a possible future clinical application. SIGNIFICANCE Established and custom-made stimulators were combined to assess different fiber subtypes of the somatosensory nervous system using modality-specific evoked potentials.
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Affiliation(s)
- Sophie-Charlotte Fabig
- Division of Neurological Pain Research and Therapy, Department of Neurology, University Hospital Schleswig-Holstein, Arnold-Heller-Straße 3, Haus D, 24105 Kiel, Germany.
| | - Dilara Kersebaum
- Division of Neurological Pain Research and Therapy, Department of Neurology, University Hospital Schleswig-Holstein, Arnold-Heller-Straße 3, Haus D, 24105 Kiel, Germany
| | - Josephine Lassen
- Division of Neurological Pain Research and Therapy, Department of Neurology, University Hospital Schleswig-Holstein, Arnold-Heller-Straße 3, Haus D, 24105 Kiel, Germany
| | - Manon Sendel
- Division of Neurological Pain Research and Therapy, Department of Neurology, University Hospital Schleswig-Holstein, Arnold-Heller-Straße 3, Haus D, 24105 Kiel, Germany
| | - Swantje Jendral
- Division of Neurological Pain Research and Therapy, Department of Neurology, University Hospital Schleswig-Holstein, Arnold-Heller-Straße 3, Haus D, 24105 Kiel, Germany
| | - Alexandra Muntean
- Division of Neurological Pain Research and Therapy, Department of Neurology, University Hospital Schleswig-Holstein, Arnold-Heller-Straße 3, Haus D, 24105 Kiel, Germany
| | - Ralf Baron
- Division of Neurological Pain Research and Therapy, Department of Neurology, University Hospital Schleswig-Holstein, Arnold-Heller-Straße 3, Haus D, 24105 Kiel, Germany
| | - Philipp Hüllemann
- Division of Neurological Pain Research and Therapy, Department of Neurology, University Hospital Schleswig-Holstein, Arnold-Heller-Straße 3, Haus D, 24105 Kiel, Germany
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Liu Y, Wang W, Xu W, Cheng Q, Ming D. Quantifying the Generation Process of Multi-Level Tactile Sensations via ERP Component Investigation. Int J Neural Syst 2021; 31:2150049. [PMID: 34635035 DOI: 10.1142/s0129065721500490] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Humans obtain characteristic information such as texture and weight of external objects, relying on the brain's integration and classification of tactile information; however, the decoding mechanism of multi-level tactile information is relatively elusive from the temporal sequence. In this paper, nonvariant frequency, along with the variant pulse width of electrotactile stimulus, was performed to generate multi-level pressure sensation. Event-related potentials (ERPs) were measured to investigate the mechanism of whole temporal tactile processing. Five ERP components, containing P100-N140-P200-N200-P300, were observed. By establishing the relationship between stimulation parameters and ERP component amplitudes, we found the following: (1) P200 is the most significant component for distinguishing multi-level tactile sensations; (2) P300 is correlated well with the subjective judgment of tactile sensation. The temporal sequence of brain topographies was implemented to clarify the spatiotemporal characteristics of the tactile process, which conformed to the serial processing model in neurophysiology and cortical network response area described by fMRI. Our results can help further clarify the mechanism of tactile sequential processing, which can be applied to improve the tactile BCI performance, sensory enhancement, and clinical diagnosis for doctors to evaluate the tactile process disorders by examining the temporal ERP components.
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Affiliation(s)
- Yuan Liu
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China, 92 Weijin Road, Nankai District, Tianjin, P. R. China
| | - Wenjie Wang
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China, 92 Weijin Road, Nankai District, Tianjin, P. R. China
| | - Weiguo Xu
- Tianjin Hospital, Tianjin University, Tianjin, China, 406 South Jiefang Road, Hexi District, Tianjin, P. R. China
| | - Qian Cheng
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China, 92 Weijin Road, Nankai District, Tianjin, P. R. China
| | - Dong Ming
- College of Precision Instruments and Optoelectronics Engineering, Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China, 92 Weijin Road, Nankai District, Tianjin, P. R. China
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7
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Montoro CI, Winterholler C, Terrasa JL, Montoya P. Somatosensory Gating Is Modulated by Anodal Transcranial Direct Current Stimulation. Front Neurosci 2021; 15:651253. [PMID: 34557064 PMCID: PMC8452934 DOI: 10.3389/fnins.2021.651253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Accepted: 08/12/2021] [Indexed: 11/13/2022] Open
Abstract
Background Anodal transcranial direct current stimulation (tDCS) of the somatosensory cortex causes cerebral hyperexcitability and a significant enhancement in pain thresholds and tactile spatial acuity. Sensory gating is a brain mechanism to suppress irrelevant incoming inputs, which is elicited by presenting pairs of identical stimuli (S1 and S2) within short time intervals between stimuli (e.g., 500 ms). Objectives/Hypothesis The present study addressed the question of whether tDCS could modulate the brain correlates of this inhibitory mechanism. Methods Forty-one healthy individuals aged 18–26 years participated in the study and were randomly assigned to tDCS (n = 21) or SHAM (n = 20). Somatosensory evoked potentials (SEP) elicited by S1 and S2 pneumatic stimuli (duration of 100 ms, ISI 550 ± 50 ms) and applied to the index finger of the dominant hand were recorded before and after tDCS. Results Before the intervention, the second tactile stimuli significantly attenuated the amplitudes of P50, N100, and the late positive complex (LPC, mean amplitude in the time window 150–350) compared to the first stimuli. This confirmed that sensory gating is a widespread brain inhibitory mechanism that can affect early- and middle-latency components of SEPs. Furthermore, our data revealed that this response attenuation or sensory gating (computed as S1 minus S2) was improved after tDCS for LPC, while no changes were found in participants who received SHAM. Conclusion All these findings suggested that anodal tDCS might modulate brain excitability leading to an enhancement of inhibitory mechanisms elicited in response to repetitive somatosensory stimuli during late stages of information processing.
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Affiliation(s)
- Casandra I Montoro
- Research Institute of Health Sciences (IUNICS), Balearic Islands Health Research Institute (IdISBa), University of the Balearic Islands (UIB), Palma, Spain
| | - Christine Winterholler
- Research Institute of Health Sciences (IUNICS), Balearic Islands Health Research Institute (IdISBa), University of the Balearic Islands (UIB), Palma, Spain
| | - Juan L Terrasa
- Research Institute of Health Sciences (IUNICS), Balearic Islands Health Research Institute (IdISBa), University of the Balearic Islands (UIB), Palma, Spain
| | - Pedro Montoya
- Research Institute of Health Sciences (IUNICS), Balearic Islands Health Research Institute (IdISBa), University of the Balearic Islands (UIB), Palma, Spain
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8
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Transcutaneous auricular VNS applied to experimental pain: A paired behavioral and EEG study using thermonociceptive CO2 laser. PLoS One 2021; 16:e0254480. [PMID: 34252124 PMCID: PMC8274876 DOI: 10.1371/journal.pone.0254480] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 06/24/2021] [Indexed: 11/19/2022] Open
Abstract
Background Transcutaneous auricular Vagal Nerve Stimulation (taVNS) is a non-invasive neurostimulation technique with potential analgesic effects. Several studies based on subjective behavioral responses suggest that taVNS modulates nociception differently with either pro-nociceptive or anti-nociceptive effects. Objective This study aimed to characterize how taVNS alters pain perception, by investigating its effects on event-related potentials (ERPs) elicited by different types of spinothalamic and lemniscal somatosensory stimuli, combined with quantitative sensory testing (detection threshold and intensity ratings). Methods We performed 3 experiments designed to study the time-dependent effects of taVNS and compare with standard cervical VNS (cVNS). In Experiment 1, we assessed the effects of taVNS after 3 hours of stimulation. In Experiment 2, we focused on the immediate effects of the duty cycle (OFF vs. ON phases). Experiments 1 and 2 included 22 and 15 healthy participants respectively. Both experiments consisted of a 2-day cross-over protocol, in which subjects received taVNS and sham stimulation sequentially. In addition, subjects received a set of nociceptive (thermonociceptive CO2 laser, mechanical pinprick) and non-nociceptive (vibrotactile, cool) stimuli, for which we recorded detection thresholds, intensity of perception and ERPs. Finally, in Experiment 3, we tested 13 epileptic patients with an implanted cVNS by comparing OFF vs. ON cycles, using a similar experimental procedure. Results Neither taVNS nor cVNS appeared to modulate the cerebral and behavioral aspects of somatosensory perception. Conclusion The potential effect of taVNS on nociception requires a cautious interpretation, as we found no objective change in behavioral and cerebral responses to spinothalamic and lemniscal somatosensory stimulations.
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Li X, Yao J, Zhang W, Chen S, Peng W. Effects of transcranial direct current stimulation on experimental pain perception: A systematic review and meta-analysis. Clin Neurophysiol 2021; 132:2163-2175. [PMID: 34284252 DOI: 10.1016/j.clinph.2021.05.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 04/01/2021] [Accepted: 05/16/2021] [Indexed: 12/26/2022]
Abstract
OBJECTIVE Many studies have examined the effectiveness of transcranial direct current stimulation (tDCS) on human pain perception in both healthy populations and pain patients. Nevertheless, studies have yielded conflicting results, likely due to differences in stimulation parameters, experimental paradigms, and outcome measures. Human experimental pain models that utilize indices of pain in response to well-controlled noxious stimuli can avoid many confounds present in clinical data. This study aimed to assess the robustness of tDCS effects on experimental pain perception among healthy populations. METHODS We conducted three meta-analyses that analyzed tDCS effects on ratings of perceived pain intensity to suprathreshold noxious stimuli, pain threshold and tolerance. RESULTS The meta-analyses showed a statically significant tDCS effect on attenuating pain-intensity ratings to suprathreshold noxious stimuli. In contrast, tDCS effects on pain threshold and pain tolerance were statistically non-significant. Moderator analysis further suggested that stimulation parameters (active electrode size and current density) and experimental pain modality moderated the effectiveness of tDCS in attenuating pain-intensity ratings. CONCLUSION The effectiveness of tDCS on attenuating experimental pain perception depends on both stimulation parameters of tDCS and the modality of experimental pain. SIGNIFICANCE This study provides some theoretical basis for the application of tDCS in pain management.
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Affiliation(s)
- Xiaoyun Li
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Junjie Yao
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Wenyun Zhang
- School of Psychology, Shenzhen University, Shenzhen, China
| | - Shengxiong Chen
- Medical Rehabilitation Center, Shenzhen Prevention and Treatment Center for Occupational Diseases, Shenzhen, China
| | - Weiwei Peng
- School of Psychology, Shenzhen University, Shenzhen, China; Shenzhen Key Laboratory of Affective and Social Cognitive Science, Shenzhen University, Shenzhen, China.
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10
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Measuring the sensitivity of tactile temporal order judgments in sighted and blind participants using the adaptive psi method. Atten Percept Psychophys 2021; 83:2995-3007. [PMID: 34036536 DOI: 10.3758/s13414-021-02301-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/14/2021] [Indexed: 11/08/2022]
Abstract
Spatial locations of somatosensory stimuli are coded according to somatotopic (anatomical distribution of the sensory receptors on the skin surface) and spatiotopic (position of the body parts in external space) reference frames. This was mostly evidenced by means of temporal order judgment (TOJ) tasks in which participants discriminate the temporal order of two tactile stimuli, one applied on each hand. Because crossing the hands generates a conflict between anatomical and spatial responses, TOJ performance is decreased in such posture, except for congenitally blind people, suggesting a role of visual experience in somatosensory perception. In previous TOJ studies, stimuli were generally presented using the method of constant stimuli-that is, the repetition of a predefined sample of stimulus-onset asynchronies (SOA) separating the two stimuli. This method has the disadvantage that a large number of trials is needed to obtain reliable data when aiming at dissociating performances of groups characterized by different cognitive abilities. Indeed, each SOA among a large variety of different SOAs should be presented the same number of times irrespective of the participant's performance. This study aimed to replicate previous tactile TOJ data in sighted and blind participants with the adaptive psi method in order to validate a novel method that adapts the presented SOA according to the participant's performance. This allows to precisely estimate the temporal sensitivity of each participant while the presented stimuli are adapted to the participant's individual discrimination threshold. We successfully replicated previous findings in both sighted and blind participants, corroborating previous data using a more suitable psychophysical tool.
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Rohel A, Bouffard J, Patricio P, Mavromatis N, Billot M, Roy J, Bouyer L, Mercier C, Masse‐Alarie H. The effect of experimental pain on the excitability of the corticospinal tract in humans: A systematic review and meta‐analysis. Eur J Pain 2021; 25:1209-1226. [DOI: 10.1002/ejp.1746] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 01/19/2021] [Accepted: 02/01/2021] [Indexed: 12/14/2022]
Affiliation(s)
- Antoine Rohel
- Center for Interdisciplinary Research in Rehabilitation and Social Integration Quebec City Quebec Canada
| | - Jason Bouffard
- Center for Interdisciplinary Research in Rehabilitation and Social Integration Quebec City Quebec Canada
| | - Philippe Patricio
- Center for Interdisciplinary Research in Rehabilitation and Social Integration Quebec City Quebec Canada
| | - Nicolas Mavromatis
- Center for Interdisciplinary Research in Rehabilitation and Social Integration Quebec City Quebec Canada
| | - Maxime Billot
- Center for Interdisciplinary Research in Rehabilitation and Social Integration Quebec City Quebec Canada
| | - Jean‐Sébastien Roy
- Center for Interdisciplinary Research in Rehabilitation and Social Integration Quebec City Quebec Canada
- Department of Rehabilitation Faculty of Medicine Laval University Quebec City Quebec Canada
| | - Laurent Bouyer
- Center for Interdisciplinary Research in Rehabilitation and Social Integration Quebec City Quebec Canada
- Department of Rehabilitation Faculty of Medicine Laval University Quebec City Quebec Canada
| | - Catherine Mercier
- Center for Interdisciplinary Research in Rehabilitation and Social Integration Quebec City Quebec Canada
- Department of Rehabilitation Faculty of Medicine Laval University Quebec City Quebec Canada
| | - Hugo Masse‐Alarie
- Center for Interdisciplinary Research in Rehabilitation and Social Integration Quebec City Quebec Canada
- Department of Rehabilitation Faculty of Medicine Laval University Quebec City Quebec Canada
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High definition transcranial direct current stimulation (HD-tDCS): A systematic review on the treatment of neuropsychiatric disorders. Asian J Psychiatr 2021; 56:102542. [PMID: 33486461 DOI: 10.1016/j.ajp.2020.102542] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 12/14/2020] [Accepted: 12/28/2020] [Indexed: 12/15/2022]
Abstract
HD-tDCS (High-definition transcranial direct current stimulation) is a novel non-invasive brain stimulation (NIBS) technique based on the principle that when weak intensity electric currents are targeted on specific areas of the scalp, they cause underlying cortical stimulation. HD-tDCS shares its technical methodology with conventional tDCS (montage comprising of one anode and one cathode) except for a few modifications that are believed to have focal and longer-lasting neuromodulation effects. Although HD-tDCS is a recently available NIBS technique, impactful studies, case reports, and few controlled trials have been conducted in this context, facilitating an understanding of its neurobiological effects and the clinical translation of the same in health care set-up. The current article narratively reviews the mechanism of action of HD-tDCS, and it systematically examines the cognitive, clinical, and neurobiological effects of HD-tDCS in healthy volunteers as well as patients with neuropsychiatric conditions. Thus, this review attempts to explore the role of HD-tDCS in present-day practice and the future in the context of various neurological and psychiatric disorders.
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Hypervigilance for Bodily Sensations in the Back During a Movement Task in People With Chronic and Recurrent Low Back Pain. Clin J Pain 2020; 36:524-532. [PMID: 32080002 DOI: 10.1097/ajp.0000000000000823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES The current study assessed the role of hypervigilance for bodily sensations in the back in long-term low back pain problems. METHODS People with chronic low back pain, recurrent low back pain, and no low back pain were compared on the extent to which they attended to somatosensory stimuli on the back during a movement task. To measure hypervigilance, somatosensory event-related potentials (SEPs) to task-irrelevant tactile stimuli on the back were measured when preparing movements in either a threatening or a neutral condition, indicated by a cue signaling possible pain on the back during movement or not. RESULTS Results showed stronger attending to stimuli on the back in the threat condition than in the neutral condition, as reflected by increased amplitude of the N96 SEP. However, this effect did not differ between groups. Similarly, for all 3 groups the amplitude of the P172 was larger for the threatening condition, suggesting a more general state of arousal resulting in increased somatosensory responsiveness. No significant associations were found between somatosensory attending to the back and theorized antecedents such as pain catastrophizing, pain-related fear, and pain vigilance. DISCUSSION The current study confirmed that individuals preparing a movement attended more toward somatosensory stimuli at the lower back when anticipating back pain during the movement, as measured by the N96 SEP. However, no differences were found between participants with chronic low back pain or recurrent low back pain, or the pain-free controls.
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Somatosensory attending to the lower back is associated with response speed of movements signaling back pain. Brain Res 2019; 1723:146383. [PMID: 31419425 DOI: 10.1016/j.brainres.2019.146383] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 06/14/2019] [Accepted: 08/12/2019] [Indexed: 11/22/2022]
Abstract
The present study investigated if preparing a movement that is expected to evoke pain results in hesitation to initiate the movement (i.e., avoidance) and, especially, if the allocation of attention to the threatened body part mediates such effect. To this end, healthy volunteers (N = 33) performed a postural perturbation task recruiting lower back muscles. In 'threat trials', the movement was sometimes followed by an experimental pain stimulus on the back, whereas in 'no-threat trials', a non-painful control stimulus was applied. Electroencephalography (EEG) was used to assess attending to the lower back. Specifically, somatosensory evoked potentials (SEPs) to task-irrelevant tactile stimuli administered to the lower back were recorded during movement preparation. Reaction times (RTs) were recorded to assess movement initiation. The results revealed faster responses and enhanced somatosensory attending to the lower back on threat trials than on no-threat trials. Importantly, the amplitude of the N95 SEP component predicted RTs and was found to partially mediate the effect of pain anticipation on movement initiation. These findings suggest that somatosensory attending might be a potential mechanism by which pain anticipation can modulate motor execution.
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Huang G, Liu J, Li L, Zhang L, Zeng Y, Ren L, Ye S, Zhang Z. A novel training-free externally-regulated neurofeedback (ER-NF) system using phase-guided visual stimulation for alpha modulation. Neuroimage 2019; 189:688-699. [PMID: 30711469 DOI: 10.1016/j.neuroimage.2019.01.072] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Revised: 12/31/2018] [Accepted: 01/29/2019] [Indexed: 12/28/2022] Open
Abstract
The efficacy of neurofeedback is a point of great controversy, because a certain proportion of users cannot properly regulate their brain activities and thereby fail to benefit from neurofeedback. To address the neurofeedback inefficacy problem, the present study is aimed to design and implement a new neurofeedback system that can more effectively and consistently regulate users' brain activities than the conventional way of training users to voluntarily regulate brain activities. The new neurofeedback system delivers external visual stimuli continuously at a specific alpha phase, which is real-time decoded from ongoing alpha wave, to regulate the alpha wave. Experimental results show that the proposed training-free externally-regulated neurofeedback (ER-NF) system can achieve consistent (effective in almost all sessions for almost all users), flexible (either increasing or decreasing peak alpha frequency and alpha power), and immediate (taking or losing effect immediately after stimulation is on or off) modulation effects on alpha wave. Therefore, the ER-NF system holds great potential to be able to more reliably and flexibly modulate cognition and behavior.
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Affiliation(s)
- Gan Huang
- School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen, 518060, China; Guangdong Provincial Key Laboratory of Biomedical Measurements and Ultrasound Imaging, Shenzhen, 518060, China
| | - Jia Liu
- School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen, 518060, China; Guangdong Provincial Key Laboratory of Biomedical Measurements and Ultrasound Imaging, Shenzhen, 518060, China
| | - Linling Li
- School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen, 518060, China; Guangdong Provincial Key Laboratory of Biomedical Measurements and Ultrasound Imaging, Shenzhen, 518060, China
| | - Li Zhang
- School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen, 518060, China; Guangdong Provincial Key Laboratory of Biomedical Measurements and Ultrasound Imaging, Shenzhen, 518060, China
| | - Yixuan Zeng
- Department of Neurology, Shenzhen Second People's Hospital, Shenzhen University 1st Affiliated Hospital, Shenzhen, 518029, China
| | - Lijie Ren
- Department of Neurology, Shenzhen Second People's Hospital, Shenzhen University 1st Affiliated Hospital, Shenzhen, 518029, China
| | - Shiqing Ye
- School of Information Science and Technology, Fudan University, Shanghai, 200433, China
| | - Zhiguo Zhang
- School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen, 518060, China; Guangdong Provincial Key Laboratory of Biomedical Measurements and Ultrasound Imaging, Shenzhen, 518060, China.
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Temporal Profile and Limb-specificity of Phasic Pain-Evoked Changes in Motor Excitability. Neuroscience 2018; 386:240-255. [DOI: 10.1016/j.neuroscience.2018.06.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 06/20/2018] [Accepted: 06/24/2018] [Indexed: 12/17/2022]
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Folmli B, Turman B, Johnson P, Abbott A. Dose response of somatosensory cortex repeated anodal transcranial direct current stimulation on vibrotactile detection: a randomized sham-controlled trial. J Neurophysiol 2018; 120:610-616. [PMID: 29726731 DOI: 10.1152/jn.00926.2017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
This randomized sham-controlled trial investigated anodal transcranial direct current stimulation (tDCS) over the somatosensory cortex contralateral to hand dominance for dose-response (1 mA, 20 min × 5 days) effects on vibrotactile detection thresholds (VDT). VDT was measured before and after tDCS on days 1, 3, and 5 for low- (30 Hz) and high-frequency (200 Hz) vibrations on the dominant and nondominant hands in 29 healthy adults (mean age = 22.86 yr; 15 men, 14 women). Only the dominant-hand 200-Hz VDT displayed statistically significant medium effect size improvement for mixed-model analysis of variance time-by-group interaction for active tDCS compared with sham. Post hoc contrasts were statistically significant for dominant-hand 200-Hz VDT on day 5 after tDCS compared with day 1 before tDCS, day 1 after tDCS, and day 3 before tDCS. There was a linear dose-response improvement with dominant-hand 200-Hz VDT mean difference decreasing from day 1 before tDCS peaking at -15.5% (SD = 34.9%) on day 5 after tDCS. Both groups showed learning effect trends over time for all VDT test conditions, but only the nondominant-hand 30-Hz VDT was statistically significant ( P = 0.03), although post hoc contrasts were nonsignificant after Šidák adjustment. No adverse effects for tDCS were reported. In conclusion, anodal tDCS at 1 mA, 20 min × 5 days on the dominant sensory cortex can modulate a linear improvement of dominant-hand high-frequency VDT but not low-frequency or nondominant-hand VDT. NEW & NOTEWORTHY Repeated weak anodal transcranial direct current stimulation (1 mA, 20 min) on the dominant sensory cortex provides linear improvement in dominant-hand high-frequency vibration detection thresholds. No effects were observed for low-frequency or nondominant-hand vibration detection thresholds.
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Affiliation(s)
- Brookes Folmli
- Faculty of Health Sciences & Medicine, Bond University , Gold Coast, Queensland , Australia
| | - Bulent Turman
- Faculty of Health Sciences & Medicine, Bond University , Gold Coast, Queensland , Australia
| | - Peter Johnson
- Faculty of Health Sciences & Medicine, Bond University , Gold Coast, Queensland , Australia
| | - Allan Abbott
- Faculty of Health Sciences & Medicine, Bond University , Gold Coast, Queensland , Australia.,Department of Medical and Health Sciences, Division of Physiotherapy, Faculty of Medicine and Health Sciences, Linköping University , Linköping , Sweden
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De Keyser R, van den Broeke EN, Courtin A, Dufour A, Mouraux A. Event-related brain potentials elicited by high-speed cooling of the skin: A robust and non-painful method to assess the spinothalamic system in humans. Clin Neurophysiol 2018; 129:1011-1019. [PMID: 29567583 DOI: 10.1016/j.clinph.2018.02.123] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 02/02/2018] [Accepted: 02/14/2018] [Indexed: 10/17/2022]
Abstract
OBJECTIVE To investigate whether cool-evoked potentials (CEP) elicited by brisk innocuous cooling of the skin could serve as an alternative to laser-evoked potentials (LEP), currently considered as the best available neurophysiological tool to assess the spinothalamic tract and diagnose neuropathic pain. METHODS A novel device made of micro-Peltier elements and able to cool the skin at -300 °C/s was used to record CEPs elicited by stimulation of the hand dorsum in 40 healthy individuals, characterize the elicited responses, and assess their signal-to-noise ratio. Various stimulation surfaces (40 mm2 and 120 mm2), cooling ramps (-200 °C/s and -133 °C/s) and temperature steps (20 °C, 15 °C, 10 °C, 5 °C) were tested to identify optimal stimulation conditions. RESULTS CEPs were observed in all conditions and subjects, characterized by a biphasic negative-positive complex maximal at the vertex (Cz), peaking 190-400 ms after stimulus onset, preceded by a negative wave over central-parietal areas contralateral to the stimulated hand. Their magnitude was modulated by stimulation surface, cooling ramp and temperature step. CONCLUSION Rapid innocuous skin cooling elicits robust CEPs at latencies compatible with the conduction velocity of Aδ-fibers. SIGNIFICANCE CEPs can be a complementary tool to the recording of LEPS for assessing the function of small-diameter Aδ-fibers and the spinothalamic tract.
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Affiliation(s)
- Roxane De Keyser
- Institute of Neuroscience, Université catholique de Louvain, B-1200 Brussels, Belgium
| | | | - Arthur Courtin
- Institute of Neuroscience, Université catholique de Louvain, B-1200 Brussels, Belgium
| | - André Dufour
- Centre d'investigations neurocognitives et neurophysiologiques (CI2N), CNRS, University of Strasbourg, France
| | - André Mouraux
- Institute of Neuroscience, Université catholique de Louvain, B-1200 Brussels, Belgium.
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Fujimoto S, Tanaka S, Laakso I, Yamaguchi T, Kon N, Nakayama T, Kondo K, Kitada R. The Effect of Dual-Hemisphere Transcranial Direct Current Stimulation Over the Parietal Operculum on Tactile Orientation Discrimination. Front Behav Neurosci 2017; 11:173. [PMID: 28979197 PMCID: PMC5611440 DOI: 10.3389/fnbeh.2017.00173] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Accepted: 09/04/2017] [Indexed: 12/11/2022] Open
Abstract
The parietal operculum (PO) often shows ipsilateral activation during tactile object perception in neuroimaging experiments. However, the relative contribution of the PO to tactile judgment remains unclear. Here, we examined the effect of transcranial direct current stimulation (tDCS) over bilateral PO to test the relative contributions of the ipsilateral PO to tactile object processing. Ten healthy adults participated in this study, which had a double-blind, sham-controlled, cross-over design. Participants discriminated grating orientation during three tDCS and sham conditions. In the dual-hemisphere tDCS conditions, anodal and cathodal electrodes were placed over the left and right PO. In the uni-hemisphere tDCS condition, anodal and cathodal electrodes were applied over the left PO and contralateral orbit, respectively. In the tDCS and sham conditions, we applied 2 mA for 15 min and for 15 s, respectively. Computational models of electric fields (EFs) during tDCS indicated that the strongest electric fields were located in regions in and around the PO. Compared with the sham condition, dual-hemisphere tDCS improved the discrimination threshold of the index finger contralateral to the anodal electrode. Importantly, dual-hemisphere tDCS with the anodal electrode over the left PO yielded a decreased threshold in the right finger compared with the uni-hemisphere tDCS condition. These results suggest that the ipsilateral PO inhibits tactile processing of grating orientation, indicating interhemispheric inhibition (IHI) of the PO.
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Affiliation(s)
- Shuhei Fujimoto
- Tokyo Bay Rehabilitation HospitalChiba, Japan.,Department of Public Health, Kyoto University Graduate School of MedicineKyoto, Japan.,Link & Communication Inc.Tokyo, Japan.,Laboratory of Psychology, Hamamatsu University School of MedicineShizuoka, Japan
| | - Satoshi Tanaka
- Laboratory of Psychology, Hamamatsu University School of MedicineShizuoka, Japan
| | - Ilkka Laakso
- Department of Electrical Engineering and Automation, Aalto UniversityEspoo, Finland
| | - Tomofumi Yamaguchi
- Department of Rehabilitation Medicine, Keio University School of MedicineTokyo, Japan.,Department of Neuroscience and Pharmacology, University of CopenhagenCopenhagen, Denmark.,Department of Physical Therapy, Yamagata Prefectural University of Health SciencesYamagata, Japan
| | - Noriko Kon
- Department of Therapy, Kawakita Rehabilitation HospitalTokyo, Japan
| | - Takeo Nakayama
- Department of Public Health, Kyoto University Graduate School of MedicineKyoto, Japan
| | | | - Ryo Kitada
- Division of Psychology, School of Social Sciences (SSS), College of Humanities, Arts, & Social Sciences, Nanyang Technological UniversitySingapore, Singapore
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