Study of the Optimal Number of Repetitions to Investigate the Cerebral Activity by fNIRS During a Voluntary Movement and an Illusory Movement Induced by Vibration
NCT ID: NCT07203807
Last Updated: 2026-01-08
Study Results
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Basic Information
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COMPLETED
29 participants
OBSERVATIONAL
2025-10-27
2025-10-31
Brief Summary
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This will be done by repeating both tasks 20 times for 10 seconds.
The study aims to determine the minimum number of repetitions (blocks) required to maximize cerebral activity.
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Detailed Description
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To obtain a robust hemodynamic response, fNIRS studies use a block-design experimental paradigm, alternating between periods of task performance and rest. However, there is considerable heterogeneity in the number of blocks used in the literature, making it difficult to construct an optimal paradigm. Among the methodological issues, knowledge of the minimum number of blocks for which the cerebral response is maximal appears to be a key point.
It is generally acknowledged that increasing the number of blocks reduces intra-individual variability and improves the detection of task-specific responses. However, increasing the number of blocks increases the acquisition time, which can lead to fatigue or discomfort, particularly in elderly participants or participants with neurological disorders. A compromise must be found between methodological precision and clinical tolerance in the construction of future experimental paradigms, particularly those involving a motor task in a neurological rehabilitation context.
To date, the literature does not recommend a specific number of blocks based on the actual motor task (voluntary movement) or illusory task (induced by tendon vibration stimulation (TVS)), as both modalities are used in rehabilitation. Improving our understanding of the relationship between the number of blocks and the hemodynamic response measured by fNIRS depending on the type of task would enable us to move towards standardizing experimental paradigms.
The aim of this study is to identify the minimum number of blocks required to obtain a maximal cerebral hemodynamic response (variations in HbO and HbR), measured by fNIRS during a unilateral hand motor task and an illusory movement induced by TVS in healthy participants. Ultimately, these results will help optimize fNIRS experimental paradigms by ensuring reliable capture of task-related brain activity in a minimum of time, compatible with a pathological population.
The protocol comprises two different modalities: Voluntary movement and illusory movement of the right upper limb induced by TVS. This experiment will be conducted on young, healthy participants aged 18 to 40.
The experiment will begin and end with a one-minute rest period. Participants will be asked to open and close their right hand 20 times in 10 seconds. Similarly, they will experience 10 seconds of TVS-induced illusory movement 20 times. Each task epoch will be preceded by a 12-20 second resting period.
Both conditions will be randomized and counterbalanced. Participants can start with either the voluntary movement task or the illusory.
The fNIRS devices that will be used are the Brite MKII and Brite MKIII (Artinis Medical Systems, the Netherlands).
The vibration tool is a VibraMoov vibrator from Technoconcept in Mane, France.
Conditions
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Study Design
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OTHER
CROSS_SECTIONAL
Study Groups
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Healthy young
Healthy young participants aged 18 to 40
Voluntary movement and illusory movement of the right upper limb induced by TVS.
The protocol comprises two different modalities: Voluntary movement and illusory movement of the right upper limb induced by TVS.
The experiment will begin and end with a one-minute rest period. Participants will be asked to open and close their right hand 20 times in 10 seconds. Similarly, they will experience 10 seconds of TVS-induced illusory movement 20 times. Each task epoch will be preceded by a 12-20 second resting period.
Both conditions will be randomized and counterbalanced. Participants can start with either the voluntary movement task or the illusory.
Interventions
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Voluntary movement and illusory movement of the right upper limb induced by TVS.
The protocol comprises two different modalities: Voluntary movement and illusory movement of the right upper limb induced by TVS.
The experiment will begin and end with a one-minute rest period. Participants will be asked to open and close their right hand 20 times in 10 seconds. Similarly, they will experience 10 seconds of TVS-induced illusory movement 20 times. Each task epoch will be preceded by a 12-20 second resting period.
Both conditions will be randomized and counterbalanced. Participants can start with either the voluntary movement task or the illusory.
Eligibility Criteria
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Inclusion Criteria
2. Right-handed: Edinburgh laterality test short format QL \> 60 (Veale et al., 2014).
3. Sufficient command of the French language to understand instructions
4. No known neurological medical history
Exclusion Criteria
2. Hair volume preventing the cap from fitting and/or access to the scalp
3. Injury to right upper limb causing pain during mobilization
4. Protected person (under guardianship or trusteeship)
5. Person under court protection
6. Persons deprived of liberty
7. Persons not affiliated to a social security scheme
8. Pregnant or breast-feeding women
9. Volunteers opposed to the study
18 Years
40 Years
ALL
No
Sponsors
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Centre Hospitalier Régional d'Orléans
OTHER
Responsible Party
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Locations
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CHU Orléans
Orléans, , France
Countries
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References
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Edin BB, Vallbo AB. Dynamic response of human muscle spindle afferents to stretch. J Neurophysiol. 1990 Jun;63(6):1297-306. doi: 10.1152/jn.1990.63.6.1297.
Herold F, Wiegel P, Scholkmann F, Thiers A, Hamacher D, Schega L. Functional near-infrared spectroscopy in movement science: a systematic review on cortical activity in postural and walking tasks. Neurophotonics. 2017 Oct;4(4):041403. doi: 10.1117/1.NPh.4.4.041403. Epub 2017 Aug 1.
Naito E, Morita T, Amemiya K. Body representations in the human brain revealed by kinesthetic illusions and their essential contributions to motor control and corporeal awareness. Neurosci Res. 2016 Mar;104:16-30. doi: 10.1016/j.neures.2015.10.013. Epub 2015 Nov 10.
Pinti P, Tachtsidis I, Hamilton A, Hirsch J, Aichelburg C, Gilbert S, Burgess PW. The present and future use of functional near-infrared spectroscopy (fNIRS) for cognitive neuroscience. Ann N Y Acad Sci. 2020 Mar;1464(1):5-29. doi: 10.1111/nyas.13948. Epub 2018 Aug 7.
Schneider C, Marquis R, Johr J, Lopes da Silva M, Ryvlin P, Serino A, De Lucia M, Diserens K. Disentangling the percepts of illusory movement and sensory stimulation during tendon vibration in the EEG. Neuroimage. 2021 Nov 1;241:118431. doi: 10.1016/j.neuroimage.2021.118431. Epub 2021 Jul 28.
Other Identifiers
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CHUO-2025-17
Identifier Type: -
Identifier Source: org_study_id
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