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Boran HE, Alaydın HC, Kılınç H, Tankişi H, Samusyte G, Howells J, Koltzenburg M, Cengiz B. Long-interval afferent inhibition measurement using two different methods: Normative values, repeatability and reliability. Neurophysiol Clin 2024; 54:102940. [PMID: 38382141 DOI: 10.1016/j.neucli.2023.102940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 12/20/2023] [Accepted: 12/20/2023] [Indexed: 02/23/2024] Open
Abstract
BACKGROUND The mechanism of Short-Latency Afferent Inhibition (SAI) is relatively well understood. In contrast, Long-Latency Afferent Inhibition (LAI) has not been as extensively studied as SAI, and its underlying mechanism remains unclear. OBJECTIVE/HYPOTHESIS This study had two primary objectives: first, to determine the optimal ISIs for LAI measured by amplitude changes (A-LAI) using high-resolution ISI ranges; and second, to compare measurements of LAI by threshold-tracking (T-LAI). METHODS Twenty-eight healthy volunteers (12 males aged 24- 45 years) participated in the study. Paired peripheral electrical and transcranial magnetic stimulation (TMS) stimuli (TS1mv) were applied at varying (ISIs)- 100, 200, 250, 300, 350, 400, 450, 500, 550, 600, 700, 800, 900, 1000 ms. RESULTS Both A-LAI and T-LAI showed that LAI decreased progressively from a peak at 200 or 250 ms to 1000 ms. Using the A-LAI method, pronounced inhibition was observed at three specific ISIs: 100 ms, 250 ms and 450 ms. When A-LAI values were converted to equivalent threshold changes, they did not differ significantly from T-LAI. Reliability at distinguishing individuals, as indicated by intraclass correlation coefficient (ICC) was greater for A-LAI, with a peak value of 0.82 at 250 ms. CONCLUSION(S) The study demonstrates that ISIs of 100 ms and 250 ms can be reliably used in amplitude measurement LAI. The study demonstrates that both LAI measurements record a similar decline of inhibition with increasing ISI.
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Affiliation(s)
- Hürrem Evren Boran
- Department of Neurology, Gazi University Faculty of Medicine, Beşevler, 06500 Ankara, Turkey; Gazi University Neuropsychiatry of Education, Research and Application Center, Ankara, Turkey; NOROM, Neuroscience and Neurotechnology Center of Excellence, Ankara, Turkey
| | - Halil Can Alaydın
- Department of Neurology, Gazi University Faculty of Medicine, Beşevler, 06500 Ankara, Turkey
| | - Hasan Kılınç
- Gazi University Neuropsychiatry of Education, Research and Application Center, Ankara, Turkey
| | - Hatice Tankişi
- Department of Clinical Neurophysiology, Aarhus University Hospital, Aarhus, Denmark
| | - Ginte Samusyte
- Department of Neurology, Lithuanian University of Health Sciences, Hospital Kauno klinikos Kaunas, Lithuania; Department of Neurology, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - James Howells
- Central Clinical School, Faculty of Medicine and Health, University of Sydney, Sydney, Australia
| | - Martin Koltzenburg
- Department of Clinical and Movement Neuroscience, UCL Queen Square Institute of Neurology, Queen Square, WC1N 3BG London, United Kingdom; Department of Clinical Neurophysiology, National Hospital for Neurology and Neurosurgery, Queen Square, WC1N 3BG London, United Kingdom; Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, Queen Square, WC1N 3BG London, United Kingdom
| | - Bülent Cengiz
- Department of Neurology, Gazi University Faculty of Medicine, Beşevler, 06500 Ankara, Turkey; Gazi University Neuropsychiatry of Education, Research and Application Center, Ankara, Turkey; NOROM, Neuroscience and Neurotechnology Center of Excellence, Ankara, Turkey.
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Garcia-Sanz S, Serra Grabulosa JM, Cohen Kadosh R, Muñóz Aguilar N, Marín Gutiérrez A, Redolar Ripoll D. Effects of prefrontal and parietal neuromodulation on magnitude processing and integration. PROGRESS IN BRAIN RESEARCH 2023; 282:95-121. [PMID: 38035911 DOI: 10.1016/bs.pbr.2023.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2023]
Abstract
Numerical cognition is an essential skill for survival, which includes the processing of discrete and continuous quantities, involving a mainly right fronto-parietal network. However, the neurocognitive systems underlying the processing and integration of discrete and continuous quantities are currently under debate. Noninvasive brain stimulation techniques have been used in the study of the neural basis of numerical cognition with a spatial, temporal and functional resolution superior to other neuroimaging techniques. The present randomized sham-controlled single-blinded trial addresses the involvement of the right dorsolateral prefrontal cortex and the right intraparietal sulcus in magnitude processing and integration. Multifocal anodal transcranial direct current stimulation was applied online during the execution of magnitude comparison tasks in three conditions: right prefrontal, right parietal and sham stimulation. The results show that prefrontal stimulation produced a moderated decrease in response times in all magnitude processing and integration tasks compared to sham condition. While parietal stimulation had no significant effect on any of the tasks. The effect found is interpreted as a generalized improvement in processing speed and magnitude integration due to right prefrontal neuromodulation, which may be attributable to domain-general or domain-specific factors.
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Affiliation(s)
- Sara Garcia-Sanz
- Faculty of Psychology and Education, Universidad del Atlantico Medio, Las Palmas, Spain; Child Development Research Group, Universidad de La Sabana, Chía, Colombia.
| | | | - Roi Cohen Kadosh
- School of Psychology, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom
| | | | | | - Diego Redolar Ripoll
- Cognitive Neurolab, Faculty of Health Sciences, Universitat Oberta de Catalunya (UOC), Barcelona, Spain
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Cantone M, Fisicaro F, Ferri R, Bella R, Pennisi G, Lanza G, Pennisi M. Sex differences in mild vascular cognitive impairment: A multimodal transcranial magnetic stimulation study. PLoS One 2023; 18:e0282751. [PMID: 36867595 PMCID: PMC9983846 DOI: 10.1371/journal.pone.0282751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 02/21/2023] [Indexed: 03/04/2023] Open
Abstract
BACKGROUND Sex differences in vascular cognitive impairment (VCI) at risk for future dementia are still debatable. Transcranial magnetic stimulation (TMS) is used to evaluate cortical excitability and the underlying transmission pathways, although a direct comparison between males and females with mild VCI is lacking. METHODS Sixty patients (33 females) underwent clinical, psychopathological, functional, and TMS assessment. Measures of interest consisted of: resting motor threshold, latency of motor evoked potentials (MEPs), contralateral silent period, amplitude ratio, central motor conduction time (CMCT), including the F wave technique (CMCT-F), short-interval intracortical inhibition (SICI), intracortical facilitation, and short-latency afferent inhibition, at different interstimulus intervals (ISIs). RESULTS Males and females were comparable for age, education, vascular burden, and neuropsychiatric symptoms. Males scored worse at global cognitive tests, executive functioning, and independence scales. MEP latency was significantly longer in males, from both sides, as well CMCT and CMCT-F from the left hemisphere; a lower SICI at ISI of 3 ms from the right hemisphere was also found. After correction for demographic and anthropometric features, the effect of sex remained statistically significant for MEP latency, bilaterally, and for CMCT-F and SICI. The presence of diabetes, MEP latency bilaterally, and both CMCT and CMCT-F from the right hemisphere inversely correlated with executive functioning, whereas TMS did not correlate with vascular burden. CONCLUSIONS We confirm the worse cognitive profile and functional status of males with mild VCI compared to females and first highlight sex-specific changes in intracortical and cortico-spinal excitability to multimodal TMS in this population. This points to some TMS measures as potential markers of cognitive impairment, as well as targets for new drugs and neuromodulation therapies.
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Affiliation(s)
- Mariagiovanna Cantone
- Neurology Unit, University Hospital Policlinico “G. Rodolico-San Marco”, Catania, Italy
| | - Francesco Fisicaro
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
| | - Raffaele Ferri
- Clinical Neurophysiology Research Unit, Oasi Research Institute-IRCCS, Troina, Italy
| | - Rita Bella
- Department of Medical and Surgical Sciences and Advanced Technologies, University of Catania, Catania, Italy
| | - Giovanni Pennisi
- Clinical Neurophysiology Research Unit, Oasi Research Institute-IRCCS, Troina, Italy
| | - Giuseppe Lanza
- Clinical Neurophysiology Research Unit, Oasi Research Institute-IRCCS, Troina, Italy
- Department of Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy
- * E-mail:
| | - Manuela Pennisi
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
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Herzog R, Berger TM, Pauly MG, Xue H, Rueckert E, Münchau A, Bäumer T, Weissbach A. Cerebellar transcranial current stimulation – An intraindividual comparison of different techniques. Front Neurosci 2022; 16:987472. [PMID: 36188449 PMCID: PMC9521312 DOI: 10.3389/fnins.2022.987472] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Accepted: 08/22/2022] [Indexed: 11/13/2022] Open
Abstract
Transcranial current stimulation (tCS) techniques have been shown to induce cortical plasticity. As an important relay in the motor system, the cerebellum is an interesting target for plasticity induction using tCS, aiming to modulate its excitability and connectivity. However, until now it remains unclear, which is the most effective tCS method for inducing plasticity in the cerebellum. Thus, in this study, the effects of anodal transcranial direct current stimulation (tDCS), 50 Hz transcranial alternating current stimulation (50 Hz tACS), and high frequency transcranial random noise stimulation (tRNS) were compared with sham stimulation in 20 healthy subjects in a within-subject design. tCS was applied targeting the cerebellar lobe VIIIA using neuronavigation. We measured corticospinal excitability, short-interval intracortical inhibition (SICI), short-latency afferent inhibition (SAI), and cerebellar brain inhibition (CBI) and performed a sensor-based movement analysis at baseline and three times after the intervention (post1 = 15 min; post2 = 55 min; post3 = 95 min). Corticospinal excitability increased following cerebellar tACS and tRNS compared to sham stimulation. This effect was most pronounced directly after stimulation but lasted for at least 55 min after tACS. Cortico-cortical and cerebello-cortical conditioning protocols, as well as sensor-based movement analyses, did not change. Our findings suggest that cerebellar 50 Hz tACS is the most effective protocol to change corticospinal excitability.
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Affiliation(s)
- Rebecca Herzog
- Institute of Systems Motor Science, University of Lübeck, Lübeck, Germany
- Department of Neurology, University Hospital Schleswig Holstein, Lübeck, Germany
| | - Till M. Berger
- Institute of Systems Motor Science, University of Lübeck, Lübeck, Germany
| | - Martje G. Pauly
- Institute of Systems Motor Science, University of Lübeck, Lübeck, Germany
- Department of Neurology, University Hospital Schleswig Holstein, Lübeck, Germany
- Institute of Neurogenetics, University of Lübeck, Lübeck, Germany
| | - Honghu Xue
- Institute for Robotics and Cognitive Systems, University of Lübeck, Lübeck, Germany
| | | | - Alexander Münchau
- Institute of Systems Motor Science, University of Lübeck, Lübeck, Germany
| | - Tobias Bäumer
- Institute of Systems Motor Science, University of Lübeck, Lübeck, Germany
| | - Anne Weissbach
- Institute of Systems Motor Science, University of Lübeck, Lübeck, Germany
- Institute of Neurogenetics, University of Lübeck, Lübeck, Germany
- *Correspondence: Anne Weissbach,
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Garcia-Sanz S, Ghotme KA, Hedmont D, Arévalo-Jaimes MY, Cohen Kadosh R, Serra-Grabulosa JM, Redolar-Ripoll D. Use of transcranial magnetic stimulation for studying the neural basis of numerical cognition: A systematic review. J Neurosci Methods 2022; 369:109485. [DOI: 10.1016/j.jneumeth.2022.109485] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 12/08/2021] [Accepted: 01/18/2022] [Indexed: 02/08/2023]
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Cengiz B, Boran HE, Alaydın HC, Tankisi H, Samusyte G, Howells J, Koltzenburg M, Bostock H. Short latency afferent inhibition: comparison between threshold-tracking and conventional amplitude recording methods. Exp Brain Res 2022; 240:1241-1247. [PMID: 35192042 DOI: 10.1007/s00221-022-06327-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Accepted: 02/05/2022] [Indexed: 11/04/2022]
Abstract
Short-latency afferent inhibition (SAI), which is conventionally measured as a reduction in motor evoked potential amplitude (A-SAI), is of clinical interest as a potential biomarker for cognitive impairment. Since threshold-tracking has some advantages for clinical studies of short-interval cortical inhibition, we have compared A-SAI with a threshold-tracking alternative method (T-SAI). In the T-SAI method, inhibition was calculated by tracking the required TMS intensity for the targeted MEP amplitude (200 uV) both for the test (TMS only) and paired (TMS and peripheral stimulation) stimuli. A-SAI and T-SAI were recorded from 31 healthy subjects using ten stimuli at each of 12 inter-stimulus intervals, once in the morning and again in the afternoon. There were no differences between morning and afternoon recordings. When A-SAI was normalized by log conversion it was closely related to T-SAI. Between subjects, variability was similar for the two techniques, but within-subject variability was significantly smaller for normalized A-SAI. Conventional amplitude measurements appear more sensitive for detecting changes within-subjects, such as in interventional studies, but threshold-tracking may be as sensitive as detecting abnormal SAI in a patient.
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Affiliation(s)
- Bülent Cengiz
- Department of Neurology, Gazi University Faculty of Medicine, Beşevler, 06500, Ankara, Turkey.
| | - H Evren Boran
- Department of Neurology, Gazi University Faculty of Medicine, Beşevler, 06500, Ankara, Turkey
| | - Halil Can Alaydın
- Department of Neurology, Gazi University Faculty of Medicine, Beşevler, 06500, Ankara, Turkey
| | - Hatice Tankisi
- Department of Clinical Neurophysiology, Aarhus University Hospital, Aarhus, Denmark
| | - Gintaute Samusyte
- Department of Neurology, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - James Howells
- Central Clinical School, Faculty of Medicine and Health, University of Sydney, Sydney, Australia
| | - Martin Koltzenburg
- Department of Clinical and Movement Neuroscience, UCL Queen Square Institute of Neurology, Queen Square, London, WC1N 3BG, UK.,Department of Clinical Neurophysiology, National Hospital for Neurology and Neurosurgery, Queen Square, London, WC1N 3BG, UK
| | - Hugh Bostock
- Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, Queen Square, London, WC1N 3BG, UK
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