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Chowdhury NS, Skippen P, Si E, Chiang AKI, Millard SK, Furman AJ, Chen S, Schabrun SM, Seminowicz DA. The reliability of two prospective cortical biomarkers for pain: EEG peak alpha frequency and TMS corticomotor excitability. J Neurosci Methods 2023; 385:109766. [PMID: 36495945 PMCID: PMC9848447 DOI: 10.1016/j.jneumeth.2022.109766] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 11/10/2022] [Accepted: 12/03/2022] [Indexed: 12/12/2022]
Abstract
BACKGROUND Many pain biomarkers fail to move from discovery to clinical application, attributed to poor reliability and an inability to accurately classify at-risk individuals. Preliminary evidence has shown that high pain sensitivity is associated with slow peak alpha frequency (PAF), and depression of corticomotor excitability (CME), potentially due to impairments in ascending sensory and descending motor pathway signalling respectively NEW METHOD: The present study evaluated the reliability of PAF and CME responses during sustained pain. Specifically, we determined whether, over several days of pain, a) PAF remains stable and b) individuals show two stable and distinct CME responses: facilitation and depression. Participants were given an injection of nerve growth factor (NGF) into the right masseter muscle on Day 0 and Day 2, inducing sustained pain. Electroencephalography (EEG) to assess PAF and transcranial magnetic stimulation (TMS) to assess CME were recorded on Day 0, Day 2 and Day 5. RESULTS Using a weighted peak estimate, PAF reliability (n = 75) was in the excellent range even without standard pre-processing and ∼2 min recording length. Using a single peak estimate, PAF reliability was in the moderate-good range. For CME (n = 74), 80% of participants showed facilitation or depression of CME beyond an optimal cut-off point, with the stability of these changes in the good range. COMPARISON WITH EXISTING METHODS No study has assessed the reliability of PAF or feasibility of classifying individuals as facilitators/depressors, in response to sustained pain. PAF was reliable even in the presence of pain. The use of a weighted peak estimate for PAF is recommended, as excellent test-retest reliability can be obtained even when using minimal pre-processing and ∼2 min recording. We also showed that 80% of individuals exhibit either facilitation or depression of CME, with these changes being stable across sessions. CONCLUSIONS Our study provides support for the reliability of PAF and CME as prospective cortical biomarkers. As such, our paper adds important methodological advances to the rapidly growing field of pain biomarkers.
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Affiliation(s)
- Nahian S Chowdhury
- Center for Pain IMPACT, Neuroscience Research Australia, Sydney, New South Wales, Australia; University of New South Wales, Sydney, New South Wales, Australia.
| | - Patrick Skippen
- Center for Pain IMPACT, Neuroscience Research Australia, Sydney, New South Wales, Australia
| | - Emily Si
- Center for Pain IMPACT, Neuroscience Research Australia, Sydney, New South Wales, Australia
| | - Alan K I Chiang
- Center for Pain IMPACT, Neuroscience Research Australia, Sydney, New South Wales, Australia; University of New South Wales, Sydney, New South Wales, Australia
| | - Samantha K Millard
- Center for Pain IMPACT, Neuroscience Research Australia, Sydney, New South Wales, Australia; University of New South Wales, Sydney, New South Wales, Australia
| | - Andrew J Furman
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, USA; Center to Advance Chronic Pain Research, University of Maryland Baltimore, USA
| | - Shuo Chen
- Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, USA; Center to Advance Chronic Pain Research, University of Maryland Baltimore, USA
| | - Siobhan M Schabrun
- Center for Pain IMPACT, Neuroscience Research Australia, Sydney, New South Wales, Australia; School of Physical Therapy, University of Western Ontario, London, Canada
| | - David A Seminowicz
- Center for Pain IMPACT, Neuroscience Research Australia, Sydney, New South Wales, Australia; Department of Neural and Pain Sciences, University of Maryland School of Dentistry, Baltimore, USA; Center to Advance Chronic Pain Research, University of Maryland Baltimore, USA; Department of Medical Biophysics, University of Western Ontario, London, Canada
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Szelényi A, Fava E. Long latency responses in tongue muscle elicited by various stimulation sites in anesthetized humans - New insights into tongue-related brainstem reflexes. Brain Stimul 2022; 15:566-575. [PMID: 35341967 DOI: 10.1016/j.brs.2022.03.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 03/15/2022] [Accepted: 03/16/2022] [Indexed: 11/02/2022] Open
Abstract
BACKGROUND Long Latency Responses (LLR) in tongue muscles are a scarcely described phenomenon, the physiology of which is uncertain. OBJECTIVES The aim of this exploratory, observational study was to describe tongue-LLR elicited by direct trigeminal nerve (DTNS), dorsal column (DoColS), transcranial electric (TES) and peripheral median nerve (MNS) stimulation in a total of 93 patients undergoing neurosurgical procedures under general anesthesia. METHODS Bilateral tongue responses were derived concurrently after each of the following stimulations: (1) DTNS applied with single monophasic or train-of-three pulses, ≤5 mA; (2) DoColS applied with a train-of-three pulses, ≤10 mA; (3) TES consisting of an anodal train-of-five stimulation, ≤250 mA; (4) MNS at wrist consisting of single or train-of-three monophasic pulses, ≤50 mA. Polyphasic tongue muscle responses exceeding the latencies of tongue compound muscle action potentials or motor evoked potentials were classified as LLR. RESULTS Tongue-LLR were evoked from all stimulation sites, with latencies as follows: (1) DTNS: solely ipsilateral 20.2 ± 3.3 msec; (2) DoColS: ipsilateral 25.9 ± 1.6 msec, contralateral 25.1 ± 4.2 msec; (3) TES: contralateral 55.3 ± 10.2 msec, ipsilateral 54.9 ± 12.0 msec; (4) MNS: ipsilateral 37.8 ± 4.7 msec and contralateral 40.3 ± 3.5 msec. CONCLUSION The tongue muscles are a common efferent in brainstem pathways targeted by trigeminal and cervical sensory fibers. DTNS can elicit the "trigemino-hypoglossal-reflex". For the MNS elicited tongue-LLR, we propose the term "somatosensory-evoked tongue-reflex". Although the origin of the TES related tongue-LLR remains unclear, these data will help to interpret intraoperative tongue recordings.
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Affiliation(s)
- Andrea Szelényi
- Department of Neurosurgery, University Hospital, LMU Munich, Munich, Germany.
| | - Enrica Fava
- Department of Neurosurgery, Great Metropolitan Hospital of Niguarda, University of Milano, Italy
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Fear of movement is associated with corticomotor depression in response to acute experimental muscle pain. Exp Brain Res 2020; 238:1945-1955. [DOI: 10.1007/s00221-020-05854-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 06/11/2020] [Indexed: 12/28/2022]
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Sessle BJ. Can you be too old for oral implants? An update on ageing and plasticity in the oro‐facial sensorimotor system. J Oral Rehabil 2019; 46:936-951. [DOI: 10.1111/joor.12830] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Revised: 05/06/2019] [Accepted: 05/26/2019] [Indexed: 12/24/2022]
Affiliation(s)
- Barry J. Sessle
- Faculty of Dentistry University of Toronto Toronto Ontario Canada
- Department of Physiology, Faculty of Medicine University of Toronto Toronto Ontario Canada
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Tsutsumi Y, Tachibana Y, Sato F, Furuta T, Ohara H, Tomita A, Fujita M, Moritani M, Yoshida A. Cortical and Subcortical Projections from Granular Insular Cortex Receiving Orofacial Proprioception. Neuroscience 2018; 388:317-329. [DOI: 10.1016/j.neuroscience.2018.07.047] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 07/11/2018] [Accepted: 07/24/2018] [Indexed: 11/26/2022]
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Malik B, Whittle T, Ogawa T, Murray GM. Reorganization of motor unit activity at different sites within the human masseter muscle during experimental masseter pain. Eur J Oral Sci 2018; 126:400-410. [PMID: 30059170 DOI: 10.1111/eos.12561] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/27/2018] [Indexed: 12/01/2022]
Abstract
The aims were to test the hypotheses that experimental masseter muscle pain leads to recruitment and/or derecruitment of motor units at different sites within the masseter and that the patterns of change in motor unit activity differ between sites. Single motor unit (SMU) activity was recorded at two sites within the right masseter [superior/anterior, inferior/posterior (IP)] during isometric biting tasks (ramp, step level) on an intraoral force transducer in 17 participants during three experimental blocks comprising no infusion (baseline), 5% hypertonic saline infusion (pain), or isotonic saline infusion (control). A visual analog scale (VAS) was used to score pain intensity. The VAS scores were statistically significantly greater during infusion of hypertonic saline than during infusion of isotonic saline. No significant differences in force levels and rates of force change were found between experimental blocks. In comparison with isotonic saline infusion, SMUs could be recruited and derecruited at both sites during hypertonic saline infusion. The frequency of recruitment or derecruitment, in comparison with no change, was statistically significantly greater at the IP site than at the superior/anterior site. Experimental noxious masseter stimulation results in a reorganization of motor unit activity throughout the muscle, and the pattern of reorganization may be different in different regions of the muscle.
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Affiliation(s)
- Bushra Malik
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, Westmead Hospital Centre for Oral Health, University of Sydney, Westmead, Australia
| | - Terry Whittle
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, Westmead Hospital Centre for Oral Health, University of Sydney, Westmead, Australia
| | - Toru Ogawa
- Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Greg M Murray
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, Westmead Hospital Centre for Oral Health, University of Sydney, Westmead, Australia
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Sandoval I, Moura Ferreira P, Obregon F, Whittle T, Murray GM. Experimental noxious stimulation of the right masseter muscle does not affect bilateral masseter and temporalis muscle activity and force parameters during standardised isometric biting tasks. J Oral Rehabil 2018; 45:871-880. [PMID: 30024046 DOI: 10.1111/joor.12699] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 06/29/2018] [Accepted: 07/16/2018] [Indexed: 12/22/2022]
Abstract
AIM To determine if the electromyographic (EMG) activity of the left and right masseter and anterior temporalis muscles is altered by experimental right masseter muscle noxious stimulation during goal-directed isometric biting tasks in asymptomatic humans. METHODS Isometric biting tasks (slow and fast ramp biting tasks, 2-step biting task) were performed on an intraoral force transducer in 18 participants during the following blocks: baseline block, hypertonic saline infusion into the right masseter muscle (painful block) and isotonic saline infusion into the right masseter (control block). Bipolar surface electrodes recorded EMG activity from the bilateral masseter and anterior temporalis muscles. A 100-mm visual analogue scale (VAS) quantified pain intensity, and the McGill Pain Questionnaire (MPQ), the Depression, Anxiety and Stress Scales-21 (DASS-21) and the Pain Catastrophizing Scale (PCS) were completed. Repeated measures ANOVA assessed the effects of pain on the force rates (N/s), force amplitudes (N) and the root mean square (RMS) jaw muscle EMG activity across blocks. Statistical significance accepted at P < 0.05. RESULTS VAS scores were significantly (P < 0.001) higher during hypertonic than isotonic saline infusion blocks. There was no significant effect of pain on the force rates, or force levels or the RMS EMG activity of each masseter and anterior temporalis muscle. CONCLUSION The findings suggest that experimentally induced right masseter muscle pain does not modify force or surface jaw muscle EMG activity during isometric biting tasks.
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Affiliation(s)
- Isbel Sandoval
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, University of Sydney, Level 2, Westmead Hospital Centre for Oral Health, Westmead, New South Wales, 2145, Australia
| | - Polyana Moura Ferreira
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, University of Sydney, Level 2, Westmead Hospital Centre for Oral Health, Westmead, New South Wales, 2145, Australia
| | - Fabian Obregon
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, University of Sydney, Level 2, Westmead Hospital Centre for Oral Health, Westmead, New South Wales, 2145, Australia
| | - Terry Whittle
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, University of Sydney, Level 2, Westmead Hospital Centre for Oral Health, Westmead, New South Wales, 2145, Australia
| | - Greg M Murray
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, University of Sydney, Level 2, Westmead Hospital Centre for Oral Health, Westmead, New South Wales, 2145, Australia
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Yao D, Sessle BJ. Face sensorimotor cortex undergoes neuroplastic changes in a rat model of trigeminal neuropathic pain. Exp Brain Res 2018. [PMID: 29520443 DOI: 10.1007/s00221-018-5226-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Trigeminal nerve injury can result in neuropathic pain behavior and alterations in motor function, but it is unclear if such injury produces neuroplastic alterations in face sensorimotor cortex that could contribute to the alterations in motor function. Therefore, this study aimed to determine if trigeminal nerve injury in a rat neuropathic pain model induces neuroplastic changes in jaw and tongue motor representations in face sensorimotor cortex in association with facial nociceptive behavior. Right infraorbital nerve transection was performed in adult male Sprague-Dawley rats; sham-operated rats served as controls. Nociceptive behavior was assessed by testing facial mechanical sensitivity pre-operatively and post-operatively (1-28 days). Intracortical microstimulation was also applied post-operatively in a series of microelectrode penetrations to map jaw and tongue motor representations in the face sensorimotor cortex by analyzing anterior digastric and genioglossus electromyographic activities evoked by microstimulation at histologically verified sites in face primary somatosensory cortex (face-SI) as well as face primary motor cortex (face-MI). Compared to sham, infraorbital nerve injury induced a significant (2-way repeated-measures analysis of variance, P < 0.001) bilateral decrease in facial mechanical threshold that lasted up to 28 days post-operatively. Nerve injury also induced a significant bilateral decrease compared to sham (P < 0.05) in the number of anterior digastric and/or genioglossus sites in face-MI and in face-SI. These findings indicate that trigeminal nerve injury induces neuroplastic alterations in jaw and tongue motor representations in face sensorimotor cortex that are associated with facial nociceptive behavior and that may contribute to sensorimotor changes following trigeminal nerve injury.
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Affiliation(s)
- Dongyuan Yao
- School of Pharmaceutical Science and Jiangxi Mental Hospital, Nanchang University, 461 Bayi Road, Nanchang, 330006, Jiangxi, China. .,Department of Physiology, Faculty of Dentistry, and Faculty of Medicine, University of Toronto, 124 Edward St., Toronto, ON, M5G 1G6, Canada.
| | - Barry J Sessle
- Department of Physiology, Faculty of Dentistry, and Faculty of Medicine, University of Toronto, 124 Edward St., Toronto, ON, M5G 1G6, Canada
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Kida H, Sakimoto Y, Mitsushima D. Slice Patch Clamp Technique for Analyzing Learning-Induced Plasticity. J Vis Exp 2017. [PMID: 29155768 PMCID: PMC5755348 DOI: 10.3791/55876] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
The slice patch clamp technique is a powerful tool for investigating learning-induced neural plasticity in specific brain regions. To analyze motor-learning induced plasticity, we trained rats using an accelerated rotor rod task. Rats performed the task 10 times at 30-s intervals for 1 or 2 days. Performance was significantly improved on the training days compared to the first trial. We then prepared acute brain slices of the primary motor cortex (M1) in untrained and trained rats. Current-clamp analysis showed dynamic changes in resting membrane potential, spike threshold, afterhyperpolarization, and membrane resistance in layer II/III pyramidal neurons. Current injection induced many more spikes in 2-day trained rats than in untrained controls. To analyze contextual-learning induced plasticity, we trained rats using an inhibitory avoidance (IA) task. After experiencing foot-shock in the dark side of a box, the rats learned to avoid it, staying in the lighted side. We prepared acute hippocampal slices from untrained, IA-trained, unpaired, and walk-through rats. Voltage-clamp analysis was used to sequentially record miniature excitatory and inhibitory postsynaptic currents (mEPSCs and mIPSCs) from the same CA1 neuron. We found different mean mEPSC and mIPSC amplitudes in each CA1 neuron, suggesting that each neuron had different postsynaptic strengths at its excitatory and inhibitory synapses. Moreover, compared with untrained controls, IA-trained rats had higher mEPSC and mIPSC amplitudes, with broad diversity. These results suggested that contextual learning creates postsynaptic diversity in both excitatory and inhibitory synapses at each CA1 neuron. AMPA or GABAA receptors seemed to mediate the postsynaptic currents, since bath treatment with CNQX or bicuculline blocked the mEPSC or mIPSC events, respectively. This technique can be used to study different types of learning in other regions, such as the sensory cortex and amygdala.
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Affiliation(s)
- Hiroyuki Kida
- Department of Physiology, Yamaguchi University Graduate School of Medicine
| | - Yuya Sakimoto
- Department of Physiology, Yamaguchi University Graduate School of Medicine
| | - Dai Mitsushima
- Department of Physiology, Yamaguchi University Graduate School of Medicine;
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10
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Amarante LM, Caetano MS, Laubach M. Medial Frontal Theta Is Entrained to Rewarded Actions. J Neurosci 2017; 37:10757-10769. [PMID: 28978665 PMCID: PMC5666591 DOI: 10.1523/jneurosci.1965-17.2017] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 09/21/2017] [Accepted: 09/25/2017] [Indexed: 01/13/2023] Open
Abstract
Rodents lick to consume fluids. The reward value of ingested fluids is likely to be encoded by neuronal activity entrained to the lick cycle. Here, we investigated relationships between licking and reward signaling by the medial frontal cortex (MFC), a key cortical region for reward-guided learning and decision-making. Multielectrode recordings of spike activity and field potentials were made in male rats as they performed an incentive contrast licking task. Rats received access to higher- and lower-value sucrose rewards over alternating 30 s periods. They learned to lick persistently when higher-value rewards were available and to suppress licking when lower-value rewards were available. Spectral analysis of spikes and fields revealed evidence for reward value being encoded by the strength of phase-locking of a 6-12 Hz theta rhythm to the rats' lick cycle. Recordings during the initial acquisition of the task found that the strength of phase-locking to the lick cycle was strengthened with experience. A modification of the task, with a temporal gap of 2 s added between reward deliveries, found that the rhythmic signals persisted during periods of dry licking, a finding that suggests the MFC encodes either the value of the currently available reward or the vigor with which rats act to consume it. Finally, we found that reversible inactivations of the MFC in the opposite hemisphere eliminated the encoding of reward information. Together, our findings establish that a 6-12 Hz theta rhythm, generated by the rodent MFC, is synchronized to rewarded actions.SIGNIFICANCE STATEMENT The cellular and behavioral mechanisms of reward signaling by the medial frontal cortex (MFC) have not been resolved. We report evidence for a 6-12 Hz theta rhythm that is generated by the MFC and synchronized with ongoing consummatory actions. Previous studies of MFC reward signaling have inferred value coding upon temporally sustained activity during the period of reward consumption. Our findings suggest that MFC activity is temporally sustained due to the consumption of the rewarding fluids, and not necessarily the abstract properties of the rewarding fluid. Two other major findings were that the MFC reward signals persist beyond the period of fluid delivery and are generated by neurons within the MFC.
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Affiliation(s)
- Linda M Amarante
- Department of Biology and Center for Behavioral Neuroscience, American University, Washington, DC 20016, and
| | - Marcelo S Caetano
- Center for Mathematics, Computation and Cognition, Universidade Federal do ABC (UFABC), Rua Santa Adélia, 166. Santo André-SP-09210-170, Brazil
| | - Mark Laubach
- Department of Biology and Center for Behavioral Neuroscience, American University, Washington, DC 20016, and
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11
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Avivi-Arber L, Sessle BJ. Jaw sensorimotor control in healthy adults and effects of ageing. J Oral Rehabil 2017; 45:50-80. [DOI: 10.1111/joor.12554] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/23/2017] [Indexed: 12/22/2022]
Affiliation(s)
- L. Avivi-Arber
- Faculty of Dentistry; University of Toronto; Toronto ON Canada
| | - B. J. Sessle
- Faculty of Dentistry; University of Toronto; Toronto ON Canada
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Schabrun SM, Palsson TS, Thapa T, Graven-Nielsen T. Movement Does Not Promote Recovery of Motor Output Following Acute Experimental Muscle Pain. PAIN MEDICINE 2017; 19:608-614. [DOI: 10.1093/pm/pnx099] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Siobhan M Schabrun
- Western Sydney University, Brain Neuroplasticity and Rehabilitation Unit (BRAiN-u), School of Science and Health, Penrith, NSW, Australia
| | - Thorvaldur S Palsson
- Department of Health Science and Technology, Laboratory for Musculoskeletal Pain and Motor Control, Center for Neuroplasticity and Pain (CNAP), Faculty of Medicine, Aalborg University, Aalborg, Denmark
| | - Tribikram Thapa
- Western Sydney University, Brain Neuroplasticity and Rehabilitation Unit (BRAiN-u), School of Science and Health, Penrith, NSW, Australia
| | - Thomas Graven-Nielsen
- Department of Health Science and Technology, Laboratory for Musculoskeletal Pain and Motor Control, Center for Neuroplasticity and Pain (CNAP), Faculty of Medicine, Aalborg University, Aalborg, Denmark
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Abe Y, Kato C, Uchima Koecklin KH, Okihara H, Ishida T, Fujita K, Yabushita T, Kokai S, Ono T. Unilateral nasal obstruction affects motor representation development within the face primary motor cortex in growing rats. J Appl Physiol (1985) 2017; 122:1494-1503. [PMID: 28336541 DOI: 10.1152/japplphysiol.01130.2016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 03/09/2017] [Accepted: 03/20/2017] [Indexed: 12/30/2022] Open
Abstract
Postnatal growth is influenced by genetic and environmental factors. Nasal obstruction during growth alters the electromyographic activity of orofacial muscles. The facial primary motor area represents muscles of the tongue and jaw, which are essential in regulating orofacial motor functions, including chewing and jaw opening. This study aimed to evaluate the effect of chronic unilateral nasal obstruction during growth on the motor representations within the face primary motor cortex (M1). Seventy-two 6-day-old male Wistar rats were randomly divided into control (n = 36) and experimental (n = 36) groups. Rats in the experimental group underwent unilateral nasal obstruction after cauterization of the external nostril at 8 days of age. Intracortical microstimulation (ICMS) mapping was performed when the rats were 5, 7, 9, and 11 wk old in control and experimental groups (n = 9 per group per time point). Repeated-measures multivariate ANOVA was used for intergroup and intragroup statistical comparisons. In the control and experimental groups, the total number of positive ICMS sites for the genioglossus and anterior digastric muscles was significantly higher at 5, 7, and 9 wk, but there was no significant difference between 9 and 11 wk of age. Moreover, the total number of positive ICMS sites was significantly smaller in the experimental group than in the control at each age. It is possible that nasal obstruction induced the initial changes in orofacial motor behavior in response to the altered respiratory pattern, which eventually contributed to face-M1 neuroplasticity.NEW & NOTEWORTHY Unilateral nasal obstruction in rats during growth periods induced changes in arterial oxygen saturation (SpO2) and altered development of the motor representation within the face primary cortex. Unilateral nasal obstruction occurring during growth periods may greatly affect not only respiratory function but also craniofacial function in rats. Nasal obstruction should be treated as soon as possible to avoid adverse effects on normal growth, development, and physiological functions.
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Affiliation(s)
- Yasunori Abe
- Orthodontic Science, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Chiho Kato
- Orthodontic Science, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Karin Harumi Uchima Koecklin
- Orthodontic Science, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hidemasa Okihara
- Orthodontic Science, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Takayoshi Ishida
- Orthodontic Science, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Koichi Fujita
- Orthodontic Science, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tadachika Yabushita
- Orthodontic Science, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Satoshi Kokai
- Orthodontic Science, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Takashi Ono
- Orthodontic Science, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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Fujita S, Kaneko M, Nakamura H, Kobayashi M. Spatiotemporal Profiles of Proprioception Processed by the Masseter Muscle Spindles in Rat Cerebral Cortex: An Optical Imaging Study. Front Neural Circuits 2017; 11:4. [PMID: 28194098 PMCID: PMC5276849 DOI: 10.3389/fncir.2017.00004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 01/10/2017] [Indexed: 11/23/2022] Open
Abstract
Muscle spindles in the jaw-closing muscles, which are innervated by trigeminal mesencephalic neurons (MesV neurons), control the strength of occlusion and the position of the mandible. The mechanisms underlying cortical processing of proprioceptive information are critical to understanding how sensory information from the masticatory muscles regulates orofacial motor function. However, these mechanisms are mostly unknown. The present study aimed to identify the regions that process proprioception of the jaw-closing muscles using in vivo optical imaging with a voltage-sensitive dye in rats under urethane anesthesia. First, jaw opening that was produced by mechanically pulling down the mandible evoked an optical response, which reflects neural excitation, in two cortical regions: the most rostroventral part of the primary somatosensory cortex (S1) and the border between the ventral part of the secondary somatosensory cortex (S2) and the insular oral region (IOR). The kinetics of the optical signal, including the latency, amplitude, rise time, decay time and half duration, in the S1 region for the response with the largest amplitude were comparable to those in the region with the largest response in S2/IOR. Second, we visualized the regions responding to electrical stimulation of the masseter nerve, which activates both motor efferent fibers and somatosensory afferent fibers, including those that transmit nociceptive and proprioceptive information. Masseter nerve stimulation initially excited the rostral part of the S2/IOR region, and an adjacent region responded to jaw opening. The caudal part of the region showing the maximum response overlapped with the region responding to jaw opening, whereas the rostral part overlapped with the region responding to electrical stimulation of the maxillary and mandibular molar pulps. These findings suggest that proprioception of the masseter is processed in S1 and S2/IOR. Other sensory information, such as nociception, is processed in a region that is adjacent to these pulpal regions and is located in the rostral part of S2/IOR, which receives nociceptive inputs from the molar pulps. The spatial proximity of these regions may be associated with the mechanisms by which masseter muscle pain is incorrectly perceived as dental pain.
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Affiliation(s)
- Satoshi Fujita
- Department of Pharmacology, School of Dentistry, Nihon UniversityTokyo, Japan; Division of Oral and Craniomaxillofacial Research, Dental Research Center, School of Dentistry, Nihon UniversityTokyo, Japan
| | - Mari Kaneko
- Department of Pharmacology, School of Dentistry, Nihon UniversityTokyo, Japan; Department of Orthodontics, School of Dentistry, Nihon UniversityTokyo, Japan
| | - Hiroko Nakamura
- Department of Pharmacology, School of Dentistry, Nihon UniversityTokyo, Japan; Department of Pediatric Dentistry, School of Dentistry, Nihon UniversityTokyo, Japan
| | - Masayuki Kobayashi
- Department of Pharmacology, School of Dentistry, Nihon UniversityTokyo, Japan; Division of Oral and Craniomaxillofacial Research, Dental Research Center, School of Dentistry, Nihon UniversityTokyo, Japan; Molecular Dynamics Imaging Unit, RIKEN Center for Life Science TechnologiesKobe, Japan
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15
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Inamoto K, Murray GM, Whittle T. Effect of a brief episode of experimental muscle pain on jaw movement and jaw-muscle activity during chewing. Eur J Oral Sci 2016; 125:34-43. [PMID: 28008667 DOI: 10.1111/eos.12321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/31/2016] [Indexed: 11/29/2022]
Abstract
The aims of this study were to determine whether: (i) the jaw motor system develops a new pattern of jaw movement and/or jaw-muscle activity after resolution of an acute episode of jaw-muscle pain; and (ii) if jaw-muscle activity and jaw-movement features change progressively with repetition of a chewing sequence. Jaw movement and jaw muscle (masseter, anterior temporalis, and digastric) activity were recorded during free and rate-standardized chewing in eight asymptomatic participants (pain infusion group), before and at three time blocks up to 45 min after a single 0.2-ml bolus infusion of 5% hypertonic saline into the right masseter muscle. The same procedure, without infusion, was performed in another eight participants (control group). There were no significant main effects of group on jaw movement and muscle activity, suggesting that there were no persistent post-pain effects on chewing. Across groups, repetitions of free and unstandardized chewing movements were associated with progressive increases in velocity and amplitude of jaw movement and masseter and temporalis electromyographic (EMG) activity. These findings suggest that factors unrelated to pain, such as practice effects, may be playing a role in the changes in jaw movement and jaw-muscle activity observed after resolution of an acute episode of jaw-muscle pain.
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Affiliation(s)
- Kyoko Inamoto
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, Westmead Centre for Oral Health, University of Sydney, Westmead, Australia.,Department of Endodontics, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Greg M Murray
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, Westmead Centre for Oral Health, University of Sydney, Westmead, Australia
| | - Terry Whittle
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, Westmead Centre for Oral Health, University of Sydney, Westmead, Australia
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16
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Burns E, Chipchase LS, Schabrun SM. Reduced Short- and Long-Latency Afferent Inhibition Following Acute Muscle Pain: A Potential Role in the Recovery of Motor Output. PAIN MEDICINE 2016; 17:1343-1352. [PMID: 26874884 DOI: 10.1093/pm/pnv104] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 10/20/2015] [Accepted: 12/13/2015] [Indexed: 12/20/2022]
Abstract
OBJECTIVE Corticomotor output is reduced in response to acute muscle pain, yet the mechanisms that underpin this effect remain unclear. Here the authors investigate the effect of acute muscle pain on short-latency afferent inhibition, long-latency afferent inhibition, and long-interval intra-cortical inhibition to determine whether these mechanisms could plausibly contribute to reduced motor output in pain. DESIGN Observational same subject pre-post test design. SETTING Neurophysiology research laboratory. SUBJECTS Healthy, right-handed human volunteers (n = 22, 9 male; mean age ± standard deviation, 22.6 ± 7.8 years). METHODS Transcranial magnetic stimulation was used to assess corticomotor output, short-latency afferent inhibition, long-latency afferent inhibition, and long-interval intra-cortical inhibition before, during, immediately after, and 15 minutes after hypertonic saline infusion into right first dorsal interosseous muscle. Pain intensity and quality were recorded using an 11-point numerical rating scale and the McGill Pain Questionnaire. RESULTS Compared with baseline, corticomotor output was reduced at all time points (p = 0.001). Short-latency afferent inhibition was reduced immediately after (p = 0.039), and long-latency afferent inhibition 15 minutes after (p = 0.035), the resolution of pain. Long-interval intra-cortical inhibition was unchanged at any time point (p = 0.36). CONCLUSIONS These findings suggest short- and long-latency afferent inhibition, mechanisms thought to reflect the integration of sensory information with motor output at the cortex, are reduced following acute muscle pain. Although the functional relevance is unclear, the authors hypothesize a reduction in these mechanisms may contribute to the restoration of normal motor output after an episode of acute muscle pain.
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Affiliation(s)
- Emma Burns
- *Brain Rehabilitation and Neuroplasticity Unit, School of Science and Health, Western Sydney University, Campbelltown, Sydney, New South Wales, Australia
| | - Lucinda Sian Chipchase
- *Brain Rehabilitation and Neuroplasticity Unit, School of Science and Health, Western Sydney University, Campbelltown, Sydney, New South Wales, Australia
| | - Siobhan May Schabrun
- *Brain Rehabilitation and Neuroplasticity Unit, School of Science and Health, Western Sydney University, Campbelltown, Sydney, New South Wales, Australia
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17
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Pun H, Awamleh L, Lee JC, Avivi-Arber L. Decreased face primary motor cortex (face-M1) excitability induced by noxious stimulation of the rat molar tooth pulp is dependent on the functional integrity of medullary astrocytes. Exp Brain Res 2015; 234:645-57. [DOI: 10.1007/s00221-015-4448-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 09/18/2015] [Indexed: 02/03/2023]
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18
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Investigating complex basal ganglia circuitry in the regulation of motor behaviour, with particular focus on orofacial movement. Behav Pharmacol 2015; 26:18-32. [PMID: 25485640 DOI: 10.1097/fbp.0000000000000118] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Current concepts of basal ganglia function have evolved from the essentially motoric, to include a range of extramotoric functions that involve not only dopaminergic but also cholinergic, γ-aminobutyric acid (GABA)ergic and glutamatergic mechanisms. We consider these mechanisms and their efferent systems, including spiralling, feed-forward striato-nigro-striatal circuitry, involving the dorsal and ventral striatum and the nucleus accumbens (NAc) core and shell. These processes are illustrated using three behavioural models: turning-pivoting, orofacial movements in rats and orofacial movements in genetically modified mice. Turning-pivoting indicates that dopamine-dependent behaviour elicited from the NAc shell is funnelled through the NAc-nigro-striato-nigro-pedunculopontine pathway, whereas acetylcholine-dependent behaviour elicited from the NAc shell is funnelled through the NAc-ventral pallidum-mediodorsal thalamus pathway. Cooperative/synergistic interactions between striatal D1-like and D2-like dopamine receptors regulate individual topographies of orofacial movements that are funnelled through striatal projection pathways and involve interactions with GABAergic and glutamatergic receptor subtypes. This application of concerted behavioural, neurochemical and neurophysiological techniques implicates a network that is yet broader and interacts with other neurotransmitters and neuropeptides within subcortical, cortical and brainstem regions to 'sculpt' aspects of behaviour into its topographical collective.
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19
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Avivi-Arber L, Lee JC, Sessle B. Dental Occlusal Changes Induce Motor Cortex Neuroplasticity. J Dent Res 2015; 94:1757-64. [DOI: 10.1177/0022034515602478] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Modification to the dental occlusion may alter oral sensorimotor functions. Restorative treatments aim to restore sensorimotor functions; however, it is unclear why some patients fail to adapt to the restoration and remain with sensorimotor complaints. The face primary motor cortex (face-M1) is involved in the generation and control of orofacial movements. Altered sensory inputs or motor function can induce face-M1 neuroplasticity. We took advantage of the continuous eruption of the incisors in Sprague-Dawley rats and used intracortical microstimulation (ICMS) to map the jaw and tongue motor representations in face-M1. Specifically, we tested the hypothesis that multiple trimming of the right mandibular incisor, to keep it out of occlusal contacts for 7 d, and subsequent incisor eruption and restoration of occlusal contacts, can alter the ICMS-defined features of jaw and tongue motor representations (i.e., neuroplasticity). On days 1, 3, 5, and 7, the trim and trim-recovered groups had 1 to 2 mm of incisal trimming of the incisor; a sham trim group had buccal surface trimming with no occlusal changes; and a naive group had no treatment. Systematic mapping was performed on day 8 in the naive, trim, and sham trim groups and on day 14 in the trim-recovered group. In the trim group, the tongue onset latency was shorter in the left face-M1 than in the right face-M1 ( P < .001). In the trim-recovered group, the number of tongue sites and jaw/tongue overlapping sites was greater in the left face-M1 than in the right face-M1 ( P = 0.0032, 0.0016, respectively), and the center of gravity was deeper in the left than in the right face-M1 ( P = 0.026). Therefore, incisor trimming and subsequent restoration of occlusal contacts induced face-M1 neuroplasticity, reflected in significant disparities between the left and right face-M1 in some ICMS-defined features of the tongue motor representations. Such neuroplasticity may reflect or contribute to subjects’ ability to adapt their oral sensorimotor functions to an altered dental occlusion.
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Affiliation(s)
- L. Avivi-Arber
- Department of Oral Physiology, Faculty of Dentistry, University of Toronto, Toronto, Canada
- Department of Prosthodontics, Faculty of Dentistry, University of Toronto, Toronto, Canada
| | - J.-C. Lee
- Department of Oral Physiology, Faculty of Dentistry, University of Toronto, Toronto, Canada
| | - B.J. Sessle
- Department of Oral Physiology, Faculty of Dentistry, University of Toronto, Toronto, Canada
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20
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Avivi-Arber L, Lee JC, Sood M, Lakschevitz F, Fung M, Barashi-Gozal M, Glogauer M, Sessle BJ. Long-term neuroplasticity of the face primary motor cortex and adjacent somatosensory cortex induced by tooth loss can be reversed following dental implant replacement in rats. J Comp Neurol 2015; 523:2372-89. [DOI: 10.1002/cne.23793] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2014] [Revised: 04/10/2015] [Accepted: 04/15/2015] [Indexed: 12/21/2022]
Affiliation(s)
- Limor Avivi-Arber
- Department of Prosthodontic; Faculty of Dentistry; University of Toronto; Ontario Canada
- Department of Oral Physiology; Faculty of Dentistry; University of Toronto; Ontario Canada
| | - Jye-Chang Lee
- Department of Oral Physiology; Faculty of Dentistry; University of Toronto; Ontario Canada
| | - Mandeep Sood
- Department of Oral Physiology; Faculty of Dentistry; University of Toronto; Ontario Canada
- Department of Orthodontics; Faculty of Dentistry; University of Toronto; Ontario Canada
| | - Flavia Lakschevitz
- Department of Periodontics; Faculty of Dentistry; University of Toronto; Ontario Canada
| | - Michelle Fung
- Department of Oral Physiology; Faculty of Dentistry; University of Toronto; Ontario Canada
| | - Maayan Barashi-Gozal
- Department of Periodontics; Faculty of Dentistry; University of Toronto; Ontario Canada
| | - Michael Glogauer
- Department of Periodontics; Faculty of Dentistry; University of Toronto; Ontario Canada
| | - Barry J. Sessle
- Department of Oral Physiology; Faculty of Dentistry; University of Toronto; Ontario Canada
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21
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Sood M, Lee JC, Avivi-Arber L, Bhatt P, Sessle BJ. Neuroplastic changes in the sensorimotor cortex associated with orthodontic tooth movement in rats. J Comp Neurol 2015; 523:1548-68. [DOI: 10.1002/cne.23753] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 01/18/2015] [Accepted: 01/24/2015] [Indexed: 12/31/2022]
Affiliation(s)
- Mandeep Sood
- Graduate Program in Orthodontics and Collaborative Program in Neuroscience; Faculty of Dentistry; University of Toronto; Ontario M5G 1G6 Canada
| | - Jye-Chang Lee
- Department of Oral Physiology; Faculty of Dentistry; University of Toronto; Ontario M5G 1G6 Canada
| | - Limor Avivi-Arber
- Department of Oral Physiology; Faculty of Dentistry; University of Toronto; Ontario M5G 1G6 Canada
- Department of Prosthodontics; Faculty of Dentistry; University of Toronto; Ontario M5G 1G6 Canada
| | - Poolak Bhatt
- Faculty of Dentistry; University of Toronto; Ontario M5G 1G6 Canada
| | - Barry J. Sessle
- Department of Oral Physiology; Faculty of Dentistry; University of Toronto; Ontario M5G 1G6 Canada
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22
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Awamleh L, Pun H, Lee JC, Avivi-Arber L. Decreased face primary motor cortex (face-M1) excitability induced by noxious stimulation of the rat molar tooth pulp is dependent on the functional integrity of face-M1 astrocytes. Exp Brain Res 2015; 233:1261-72. [DOI: 10.1007/s00221-015-4198-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 01/05/2015] [Indexed: 02/04/2023]
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23
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Schabrun SM, Christensen SW, Mrachacz-Kersting N, Graven-Nielsen T. Motor Cortex Reorganization and Impaired Function in the Transition to Sustained Muscle Pain. Cereb Cortex 2015; 26:1878-90. [PMID: 25609242 DOI: 10.1093/cercor/bhu319] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Primary motor cortical (M1) adaptation has not been investigated in the transition to sustained muscle pain. Daily injection of nerve growth factor (NGF) induces hyperalgesia reminiscent of musculoskeletal pain and provides a novel model to study M1 in response to progressively developing muscle soreness. Twelve healthy individuals were injected with NGF into right extensor carpi radialis brevis (ECRB) on Days 0 and 2 and with hypertonic saline on Day 4. Quantitative sensory and motor testing and assessment of M1 organization and function using transcranial magnetic stimulation were performed prior to injection on Days 0, 2, and 4 and again on Day 14. Pain and disability increased at Day 2 and increased further at Day 4. Reorganization of M1 was evident at Day 4 and was characterized by increased map excitability. These changes were accompanied by reduced intracortical inhibition and increased intracortical facilitation. Interhemispheric inhibition was reduced from the "affected" to the "unaffected" hemisphere on Day 4, and this was associated with increased pressure sensitivity in left ECRB. These data provide the first evidence of M1 adaptation in the transition to sustained muscle pain and have relevance for the development of therapies that seek to target M1 in musculoskeletal pain.
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Affiliation(s)
- S M Schabrun
- School of Science and Health, University of Western Sydney, Penrith, NSW 2751, Australia
| | - S W Christensen
- Laboratory for Musculoskeletal Pain and Motor Control, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark
| | - N Mrachacz-Kersting
- Laboratory for Musculoskeletal Pain and Motor Control, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark
| | - T Graven-Nielsen
- Laboratory for Musculoskeletal Pain and Motor Control, Center for Sensory-Motor Interaction (SMI), Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark
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24
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Uchino K, Higashiyama K, Kato T, Haque T, Sato F, Tomita A, Tsutsumi K, Moritani M, Yamamura K, Yoshida A. Jaw movement-related primary somatosensory cortical area in the rat. Neuroscience 2015; 284:55-64. [DOI: 10.1016/j.neuroscience.2014.09.072] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 09/02/2014] [Accepted: 09/02/2014] [Indexed: 11/30/2022]
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25
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Bhaskaracharya M, Memon SM, Whittle T, Murray GM. Jaw movements in patients with a history of pain: an exploratory study. J Oral Rehabil 2014; 42:18-26. [DOI: 10.1111/joor.12220] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/30/2014] [Indexed: 11/29/2022]
Affiliation(s)
- M. Bhaskaracharya
- Jaw Function and Orofacial Pain Research Unit; Faculty of Dentistry; University of Sydney; Westmead NSW Australia
| | - S. M. Memon
- Jaw Function and Orofacial Pain Research Unit; Faculty of Dentistry; University of Sydney; Westmead NSW Australia
| | - T. Whittle
- Jaw Function and Orofacial Pain Research Unit; Faculty of Dentistry; University of Sydney; Westmead NSW Australia
| | - G. M. Murray
- Jaw Function and Orofacial Pain Research Unit; Faculty of Dentistry; University of Sydney; Westmead NSW Australia
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26
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Furmaga H, Park HJ, Cooperrider J, Baker KB, Johnson M, Gale JT, Machado AG. Effects of ketamine and propofol on motor evoked potentials elicited by intracranial microstimulation during deep brain stimulation. Front Syst Neurosci 2014; 8:89. [PMID: 24904312 PMCID: PMC4033249 DOI: 10.3389/fnsys.2014.00089] [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: 01/16/2014] [Accepted: 04/28/2014] [Indexed: 11/13/2022] Open
Abstract
Few preclinical or clinical studies have evaluated the effect of anesthetics on motor evoked potentials (MEPs), either alone or in the presence of conditioning stimuli such as deep brain stimulation (DBS). In this study we evaluated the effects of two commonly used anesthetic agents, propofol and ketamine (KET), on MEPs elicited by intra-cortical microstimulation of the motor cortex in a rodent model with and without DBS of the dentatothalamocortical (DTC) pathway. The effects of propofol anesthesia on MEP amplitudes during DTC DBS were found to be highly dose dependent. Standard, but not high, dose propofol potentiated the facilitatory effects of 30 Hz DTC DBS on MEPs. This facilitation was sustained and phase-dependent indicating that, compared to high dose propofol, standard dose propofol has a beta-band excitatory effect on cortical networks. In contrast, KET anesthetic demonstrated a monotonic relationship with increasing frequencies of stimulation, such that the highest frequency of stimulation resulted in the greatest MEP amplitude. KET also showed phase dependency but less pronounced than standard dose propofol. The results underscore the importance of better understanding the complex effects of anesthetics on cortical networks and exogenous stimuli. Choice of anesthetic agents and dosing may significantly confound or even skew research outcomes, including experimentation in novel DBS indications and paradigms.
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Affiliation(s)
- Havan Furmaga
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic Cleveland, OH, USA
| | - Hyun-Joo Park
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic Cleveland, OH, USA
| | - Jessica Cooperrider
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic Cleveland, OH, USA ; Center for Neurological Restoration, Department of Neurosurgery, Neurological Institute, Cleveland Clinic Cleveland, OH, USA
| | - Kenneth B Baker
- Department of Neurology, University of Minnesota Minneapolis, MN, USA
| | - Matthew Johnson
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic Cleveland, OH, USA
| | - John T Gale
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic Cleveland, OH, USA ; Center for Neurological Restoration, Department of Neurosurgery, Neurological Institute, Cleveland Clinic Cleveland, OH, USA
| | - Andre G Machado
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic Cleveland, OH, USA ; Center for Neurological Restoration, Department of Neurosurgery, Neurological Institute, Cleveland Clinic Cleveland, OH, USA
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27
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Nash P, Wiley K, Brown J, Shinaman R, Ludlow D, Sawyer AM, Glover G, Mackey S. Functional magnetic resonance imaging identifies somatotopic organization of nociception in the human spinal cord. Pain 2013; 154:776-81. [DOI: 10.1016/j.pain.2012.11.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Revised: 10/04/2012] [Accepted: 11/15/2012] [Indexed: 11/28/2022]
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28
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Isogai F, Kato T, Fujimoto M, Toi S, Oka A, Adachi T, Maeda Y, Morimoto T, Yoshida A, Masuda Y. Cortical area inducing chewing-like rhythmical jaw movements and its connections with thalamic nuclei in guinea pigs. Neurosci Res 2012; 74:239-47. [PMID: 23142519 DOI: 10.1016/j.neures.2012.10.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2012] [Revised: 10/17/2012] [Accepted: 10/30/2012] [Indexed: 11/30/2022]
Abstract
Repetitive electrical stimulation to the cortical masticatory areas (CMA) evokes rhythmical jaw movements (RJM), whose patterns vary depending on the stimulation site, in various species. In guinea pigs, although alternating bilateral jaw movements are usually seen during natural chewing, it is still unclear which cortical areas are responsible for chewing-like RJM. To address this issue, we first defined the cortical areas inducing chewing-like RJM by intracortical microstimulation. Stimulation of the most lateral area of the CMA, the granular cortex, induced chewing-like RJM, but from the region medial to this area, simple vertical RJM were induced. Subsequently, to reveal the properties of these two areas in the CMA, the connections between the CMA and the dorsal thalamus were examined by neuronal tract-tracing techniques. The area inducing chewing-like RJM possessed strong reciprocal connections, mainly with the medial part of the ventral posteromedial nucleus, which is the sensory-relay thalamus. On the other hand, the simple vertical RJM-inducing area had reciprocal connections with the motor thalamus. The present study suggests that the CMA inducing chewing-like RJM is different from the CMA inducing simple vertical RJM, and plays a role in cortically induced chewing-like RJM under the influence of the sensory thalamus in guinea pigs.
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Affiliation(s)
- Fumihiko Isogai
- Division of Oral Maxillofacial Biology, Institute for Oral Science, Matsumoto Dental University, 1780 Gobara, Hirooka, Shiojiri, Nagano 399-0781, Japan
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29
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Trulsson M, van der Bilt A, Carlsson GE, Gotfredsen K, Larsson P, Müller F, Sessle BJ, Svensson P. From brain to bridge: masticatory function and dental implants. J Oral Rehabil 2012; 39:858-77. [DOI: 10.1111/j.1365-2842.2012.02340.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/19/2012] [Indexed: 12/11/2022]
Affiliation(s)
- M. Trulsson
- Department of Dental Medicine; Karolinska Institutet; Huddinge; Sweden
| | - A. van der Bilt
- Department of Oral Maxillofacial Surgery; Prosthodontics and Special Dental Care; University Medical Center Utrecht; Utrecht; The Netherlands
| | - G. E. Carlsson
- Institute of Odontology; The Sahlgrenska Academy; University of Gothenburg; Gothenburg; Sweden
| | - K. Gotfredsen
- Department of Oral Rehabilitation; Institute of Odontology; Faculty of Health Science; University of Copenhagen; Copenhagen; Denmark
| | - P. Larsson
- Department of Prosthetic Dentistry; Institute for Postgraduate Dental Education; Jönköping; Sweden
| | - F. Müller
- Division of Gerodontology and Removable Prosthodontics; University of Geneva; Geneva; Switzerland
| | - B. J. Sessle
- Faculty of Dentistry; University of Toronto; Toronto; ON; Canada
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30
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Suppa A, Biasiotta A, Belvisi D, Marsili L, La Cesa S, Truini A, Cruccu G, Berardelli A. Heat-Evoked Experimental Pain Induces Long-Term Potentiation-Like Plasticity in Human Primary Motor Cortex. Cereb Cortex 2012; 23:1942-51. [PMID: 22744704 DOI: 10.1093/cercor/bhs182] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- A Suppa
- IRCCS Neuromed Institute, Sapienza University of Rome, 00185 Rome, Italy
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31
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Schabrun SM, Hodges PW. Muscle pain differentially modulates short interval intracortical inhibition and intracortical facilitation in primary motor cortex. THE JOURNAL OF PAIN 2012; 13:187-94. [PMID: 22227117 DOI: 10.1016/j.jpain.2011.10.013] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Revised: 10/23/2011] [Accepted: 10/28/2011] [Indexed: 10/14/2022]
Abstract
UNLABELLED Excitability of the motor cortex can be suppressed during muscle pain. Yet the mechanisms are largely unknown. Short interval intracortical inhibition (SICI) and intracortical facilitation (ICF) were examined as possible candidate mechanisms to underpin this change. SICI and ICF were investigated in 11 healthy individuals before, during and after infusion of hypertonic saline into right first dorsal interosseous (FDI). Using paired-pulse transcranial magnetic stimulation (TMS), interstimulus intervals of 2, 3, and 13 ms were investigated. Pain intensity and quality were recorded using a 10-cm visual analogue scale and the McGill Pain Questionnaire. Resting motor threshold and motor-evoked potentials (MEPs) to single TMS stimuli were recorded before and after pain. Electromyographic recordings were made from right FDI and abductor digiti minimi. Participants reported an average pain intensity of 5.8 (1.6) cm. MEP amplitudes decreased in both muscles. Compared with the pre-pain condition, SICI was increased following pain, but not during. ICF was decreased both during and after pain when compared with the pre-pain condition. These findings suggest that muscle pain differentially modulates SICI and ICF. Although the functional relevance is unknown, we hypothesize decreased facilitation and increased inhibition may contribute to the restriction of movement of a painful body part. PERSPECTIVE This article provides evidence for decreased intracortical facilitation and increased short interval intracortical inhibition in response to muscle pain. This finding is relevant to clinicians as a mechanism which may underlie restricted movement in acute and chronic pain.
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Affiliation(s)
- Siobhan M Schabrun
- The University of Queensland, NHMRC Centre of Clinical Research Excellence in Spinal Pain, Injury and Health, School of Health and Rehabilitation Science, St Lucia, Australia.
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32
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Avivi-Arber L, Martin R, Lee JC, Sessle BJ. Face sensorimotor cortex and its neuroplasticity related to orofacial sensorimotor functions. Arch Oral Biol 2011; 56:1440-65. [DOI: 10.1016/j.archoralbio.2011.04.005] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Revised: 04/05/2011] [Accepted: 04/06/2011] [Indexed: 12/20/2022]
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Honda K, Noma N, Shinoda M, Miyamoto M, Katagiri A, Kita D, Liu MG, Sessle BJ, Yasuda M, Iwata K. Involvement of peripheral ionotropic glutamate receptors in orofacial thermal hyperalgesia in rats. Mol Pain 2011; 7:75. [PMID: 21952000 PMCID: PMC3216263 DOI: 10.1186/1744-8069-7-75] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Accepted: 09/28/2011] [Indexed: 11/10/2022] Open
Abstract
Background The purpose of the present study was to elucidate the mechanisms that may underlie the sensitization of trigeminal spinal subnucleus caudalis (Vc) and upper cervical spinal cord (C1-C2) neurons to heat or cold stimulation of the orofacial region following glutamate (Glu) injection. Results Glu application to the tongue or whisker pad skin caused an enhancement of head-withdrawal reflex and extracellular signal-regulated kinase (ERK) phosphorylation in Vc-C2 neurons. Head-withdrawal reflex and ERK phosphorylation were also enhanced following cold stimulation of the tongue but not whisker pad skin in Glu-injected rats, and the head-withdrawal reflex and ERK phosphorylation were enhanced following heat stimulation of the tongue or whisker pad skin. The enhanced head-withdrawal reflex and ERK phosphorylation after heat stimulation of the tongue or whisker pad skin, and those following cold stimulation of the tongue but not whisker pad skin were suppressed following ionotropic glutamate receptor antagonists administration into the tongue or whisker pad skin. Furthermore, intrathecal administration of MEK1/2 inhibitor PD98059 caused significant suppression of enhanced head-withdrawal reflex in Glu-injected rats, heat head-withdrawal reflex in the rats with Glu injection into the tongue or whisker pad skin and cold head-withdrawal reflex in the rats with Glu injection into the tongue. Conclusions The present findings suggest that peripheral Glu receptor mechanisms may contribute to cold hyperalgesia in the tongue but not in the facial skin, and also contribute to heat hyperalgesia in the tongue and facial skin, and that the mitogen-activated protein kinase cascade in Vc-C2 neurons may be involved in these Glu-evoked hyperalgesic effects.
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Affiliation(s)
- Kuniya Honda
- Department of Physiology, Nihon University School of Dentistry, Chiyoda-ku, Tokyo, Japan
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Contribution of chronic pain and neuroticism to abnormal forebrain gray matter in patients with temporomandibular disorder. Neuroimage 2011; 55:277-86. [DOI: 10.1016/j.neuroimage.2010.12.013] [Citation(s) in RCA: 121] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Revised: 11/30/2010] [Accepted: 12/05/2010] [Indexed: 01/07/2023] Open
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Moving differently in pain: A new theory to explain the adaptation to pain. Pain 2011; 152:S90-S98. [PMID: 21087823 DOI: 10.1016/j.pain.2010.10.020] [Citation(s) in RCA: 612] [Impact Index Per Article: 47.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2010] [Revised: 10/15/2010] [Accepted: 10/18/2010] [Indexed: 11/20/2022]
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Avivi-Arber L, Lee JC, Sessle BJ. Face sensorimotor cortex neuroplasticity associated with intraoral alterations. PROGRESS IN BRAIN RESEARCH 2011; 188:135-50. [DOI: 10.1016/b978-0-444-53825-3.00014-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Adachi K, Shimizu K, Hu JW, Suzuki I, Sakagami H, Koshikawa N, Sessle BJ, Shinoda M, Miyamoto M, Honda K, Iwata K. Purinergic receptors are involved in tooth-pulp evoked nocifensive behavior and brainstem neuronal activity. Mol Pain 2010; 6:59. [PMID: 20860800 PMCID: PMC3146069 DOI: 10.1186/1744-8069-6-59] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Accepted: 09/22/2010] [Indexed: 11/10/2022] Open
Abstract
Background To evaluate whether P2X receptors are involved in responses to noxious pulp stimulation, the P2X3 and P2X2/3 receptor agonist α,β-methyleneATP (α,β-meATP) was applied to the molar tooth pulp and nocifensive behavior and extracellular-signal regulated kinase (ERK) phosphorylation in trigeminal spinal subnucleus caudalis (Vc), trigeminal spinal subnucleus interpolaris (Vi), upper cervical spinal cord (C1/C2) and paratrigeminal nucleus (Pa5) neurons were analyzed in rats. Results Genioglossus (GG) muscle activity was evoked by pulpal application of 100 mM α,β-meATP and was significantly larger than GG activity following vehicle (phosphate-buffered saline PBS) application (p < 0.01). The enhanced GG muscle activity following 100 mM α,β-meATP was significantly reduced (p < 0.05) by co-application of 1 mM TNP-ATP (P2X1, P2X3 and, P2X2/3 antagonist). A large number of pERK-LI cells were expressed in the Vc, Vi/Vc, C1/C2 and Pa5 at 5 min following pulpal application of 100 mM α,β-meATP compared to PBS application to the pulp (p < 0.05). The pERK-LI cell expression and GG muscle activity induced by 100 mM α,β-meATP pulpal application were significantly reduced after intrathecal injection of the MAPK/ERK kinase (MEK) inhibitor PD 98059 and by pulpal co-application of 1 mM TNP-ATP (p < 0.05). Conclusions The present findings suggest that activation of P2X3 and P2X2/3 receptors in the tooth pulp is sufficient to elicit nociceptive behavioral responses and trigeminal brainstem neuronal activity.
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Affiliation(s)
- Kazunori Adachi
- Department of Physiology, Nihon University School of Dentistry, Nihon University School of Dentistry, 1-8-13 Kanda-Surugadai Chiyoda-ku, Tokyo, 101-8310, Japan
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Neuroplasticity of face sensorimotor cortex and implications for control of orofacial movements. JAPANESE DENTAL SCIENCE REVIEW 2010. [DOI: 10.1016/j.jdsr.2009.11.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Thalamic afferent and efferent connectivity to cerebral cortical areas with direct projections to identified subgroups of trigeminal premotoneurons in the rat. Brain Res 2010; 1346:69-82. [PMID: 20493176 DOI: 10.1016/j.brainres.2010.05.034] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2010] [Revised: 05/11/2010] [Accepted: 05/12/2010] [Indexed: 01/06/2023]
Abstract
The roles of supramedullary brain mechanisms involved in the control of jaw movements are not fully understood. To address this issue, a series of retrograde (Fluorogold, FG) and anterograde (biotinylated dextran amine, BDA) tract-tracing studies were done in rats. At first, we identified projection patterns from defined sensorimotor cortical areas to subgroups of trigeminal premotoneurons that are located in defined brainstem areas. Focal injections of FG into these brainstem areas revealed that the rostralmost part of lateral agranular cortex (rmost-Agl), the rostralmost part of medial agranular cortex (rmost-Agm), and the rostralmost part of primary somatosensory cortex (rmost-S1) preferentially project to brainstem areas containing jaw-closing premotoneurons, jaw-opening premotoneurons and a mixture of both types of premotoneurons, respectively. The thalamic reciprocal connectivities to rmost-Agl, rmost-Agm, and rmost-S1 were then investigated following cortical injections of FG or BDA. We found many retrogradely FG-labeled neurons and large numbers of axons and terminals labeled anterogradely with BDA in the dorsal thalamus mainly on the side ipsilateral to the injection sites. The rmost-Agl had strong connections with the ventral lateral nucleus (VL), ventromedial nucleus (VM), parafascicular nucleus, and posterior nucleus (Po); the rmost-Agm with the ventral anterior nucleus, VL, VM, central lateral nucleus, paracentral nucleus, central medial nucleus, mediodorsal nucleus and Po; and the rmost-S1 with the ventral posteromedial nucleus and Po. The present results suggest that the descending multiple pathways from the cerebral cortex to jaw-closing and jaw-opening premotoneurons have unique functional roles in jaw movement motor control.
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Avivi-Arber L, Lee JC, Sessle BJ. Effects of incisor extraction on jaw and tongue motor representations within face sensorimotor cortex of adult rats. J Comp Neurol 2010; 518:1030-45. [DOI: 10.1002/cne.22261] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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ZHANG Y, BOUDREAU S, WANG M, WANG K, SESSLE B, ARENDT‐NIELSEN L, SVENSSON P. Effects of periodontal afferent inputs on corticomotor excitability in humans. J Oral Rehabil 2009; 37:39-47. [DOI: 10.1111/j.1365-2842.2009.02016.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Y. ZHANG
- Department of Anatomy & Physiology, School of Stomatology, The Fourth Military Medical University, Xi’an, China
- Orofacial Pain Laboratory, Center for Sensory‐Motor Interaction, Aalborg University, Aalborg, Denmark
| | - S. BOUDREAU
- Orofacial Pain Laboratory, Center for Sensory‐Motor Interaction, Aalborg University, Aalborg, Denmark
- Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - M. WANG
- Department of Anatomy & Physiology, School of Stomatology, The Fourth Military Medical University, Xi’an, China
| | - K. WANG
- Orofacial Pain Laboratory, Center for Sensory‐Motor Interaction, Aalborg University, Aalborg, Denmark
- Department of Oral & Maxillofacial Surgery, Aalborg Hospital, Aalborg
| | - B. SESSLE
- Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - L. ARENDT‐NIELSEN
- Orofacial Pain Laboratory, Center for Sensory‐Motor Interaction, Aalborg University, Aalborg, Denmark
| | - P. SVENSSON
- Orofacial Pain Laboratory, Center for Sensory‐Motor Interaction, Aalborg University, Aalborg, Denmark
- Department of Clinical Oral Physiology, Dental School, Aarhus University, Aarhus, Denmark
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Effects of tongue position on mandibular muscle activity and heart rate function. ACTA ACUST UNITED AC 2009; 108:881-8. [DOI: 10.1016/j.tripleo.2009.06.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Revised: 06/18/2009] [Accepted: 06/26/2009] [Indexed: 11/24/2022]
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BAAD-HANSEN L, BLICHER JU, LAPITSKAYA N, NIELSEN JF, SVENSSON P. Intra-cortical excitability in healthy human subjects after tongue training. J Oral Rehabil 2009; 36:427-34. [DOI: 10.1111/j.1365-2842.2009.01955.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Yoshida A, Taki I, Chang Z, Iida C, Haque T, Tomita A, Seki S, Yamamoto S, Masuda Y, Moritani M, Shigenaga Y. Corticofugal projections to trigeminal motoneurons innervating antagonistic jaw muscles in rats as demonstrated by anterograde and retrograde tract tracing. J Comp Neurol 2009; 514:368-86. [DOI: 10.1002/cne.22013] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Hodges PW, Galea MP, Holm S, Holm AK. Corticomotor excitability of back muscles is affected by intervertebral disc lesion in pigs. Eur J Neurosci 2009; 29:1490-500. [DOI: 10.1111/j.1460-9568.2009.06670.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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