Repetitive Transcranial Magnetic Stimulation Primed Self-controlled Practice on Motor Learning

Официальное название

The Effects of Repetitive Transcranial Magnetic Stimulation Primed Self-controlled Practice on Motor Learning and Motivation

Обзор

This study aims to investigate the additive effects of combining self-controlled practice with repetitive transcranial magnetic stimulation (rTMS) pretreatment on motivation enhancement and motor learning performance in healthy young adults. According to the "Optimizing Performance Through Intrinsic Motivation and Attention for Learning" (OPTIMAL) theory, numerous studies have demonstrated that providing learners with autonomy during practice can facilitate intrinsic motivation and motor learning. However, self-controlled practice alone may have limited effects, and further interventions may be required to amplify learning outcomes. In recent years, non-invasive brain stimulation techniques-particularly high-frequency (facilitatory) rTMS applied to the dorsolateral prefrontal cortex (DLPFC)-have been shown to enhance motivational drive and explicit learning performance by strengthening the connectivity of the DLPFC-midbrain dopamine pathway. For example, 10 Hz high-frequency stimulation can significantly improve learners' accuracy and motivation. Interestingly, several sequence learning studies have found that low-frequency (inhibitory) rTMS, when used as a priming intervention, can instead enhance implicit procedural learning. This effect may occur because inhibiting the lateral prefrontal cortex reduces its top-down suppression of implicit learning systems, thereby releasing procedural learning potential. Based on the theory of metaplasticity, applying facilitatory or inhibitory stimulation beforehand can alter the threshold of synaptic plasticity, thus influencing subsequent learning outcomes. Therefore, this study designed two DLPFC pretreatments-facilitatory and inhibitory-and combined them with self-controlled practice to systematically examine the interaction between different stimulation protocols on motivation and motor learning. This cross-sectional experiment plans to recruit 72 healthy participants aged 20 or older, randomly assigned to one of six groups: (1) facilitatory rTMS + self-controlled practice, (2) facilitatory rTMS + yoked control, (3) inhibitory rTMS + self-controlled practice, (4) inhibitory rTMS + yoked control, (5) sham rTMS + self-controlled practice, and (6) sham rTMS + yoked control. The experiment will last for seven days. On Day 1, participants will complete baseline testing, followed by facilitatory rTMS, inhibitory rTMS, or sham stimulation over the DLPFC. Immediately afterward, they will engage in a trajectory-tracking learning task (manipulating a joystick to reproduce a sine-wave pattern). After practice, participants will complete a motivation assessment. During the trajectory-tracking task, the self-controlled group can choose when to receive feedback to adjust their learning, whereas the yoked control group will receive feedback at time points matched to their paired counterpart. On Day 2, participants will again receive the assigned rTMS (facilitatory, inhibitory, or sham), complete the trajectory-tracking task, and undergo a motivation assessment. After a five-minute rest, they will perform retention and transfer tests, followed by TMS measurement of cortical excitability. On Day 7, participants will return to the laboratory to complete another retention and transfer test, along with cortical excitability measurement via TMS. The primary behavioral outcomes are the root mean square error (RMSE) and error estimation (EE) in the trajectory-tracking task. Motivation will be assessed using the Intrinsic Motivation Inventory (IMI). As there have been no prior studies combining DLPFC rTMS pretreatment with practice autonomy, the results of this experimental design are expected to provide new insights and references for enhancing motor learning ability in healthy adults.

Вмешательства

• Устройство rTMS - cTBS (Continuous Theta-Burst Stimulation)
  Continuous theta-burst stimulation (cTBS) is a patterned form of rTMS consisting of bursts of three pulses at 50Hz, repeated every 200ms (5Hz), administered continuously without breaks. In this study, cTBS is delivered over the target cortical area according to established safety guidelines (e.g., a continuous 40s train for a total of 600 pulses) at an intensity set as a percentage of the resting motor threshold. The procedure is used to induce a transient reduction in cortical excitability as a
• Поведенческое Self-controlled (autonomy)
  Self-controlled practice is a motor learning intervention in which participants are granted autonomy to make choices about key aspects of their practice sessions (e.g., when to receive feedback, the sequence/timing of trials, or selection of specific practice parameters). This design allows participants to actively control elements of the training experience according to their preference, thereby fostering intrinsic motivation and engagement. The intervention is grounded in the OPTIMAL theory of
• Устройство Sham
  Sham TBS involves the application of a sham theta-burst stimulation protocol designed to mimic the sensory experience of active TBS without delivering effective magnetic pulses to the brain. This is typically achieved by angling the coil to prevent cortical stimulation. The procedure controls for placebo effects and participant expectations while ensuring blinding. The sham stimulation session matches the timing and setup of active TBS interventions but does not induce cortical excitability chan
• Поведенческое Yoked Practice
  Yoked practice refers to a motor learning protocol in which participants perform tasks under externally controlled practice conditions, matched to the parameters (e.g., feedback) of a paired participant from a self-controlled practice group. This design removes participant autonomy over practice choices, allowing comparison between self-controlled and externally controlled practice to evaluate the effects of autonomy on motor learning and motivation.
• Устройство rTMS- iTBS (Intermittent Theta-Burst Stimulation)
  Intermittent theta-burst stimulation (iTBS) is a patterned form of repetitive transcranial magnetic stimulation (rTMS) consisting of bursts of three pulses at 50Hz, repeated every 200ms (5Hz). In this study, iTBS is delivered over the target cortical area using standard protocols (e.g., 2s trains of TBS repeated every 10s for a total of 600 pulses) at an intensity set as a percentage of the resting motor threshold. The procedure aims to facilitate cortical excitability as a priming intervention

Первичные конечные точки

• Change in Motor Task Accuracy (Root Mean Square Error, RMSE) [Срок оценки: Throughout practice on Day1 and Day2, immediately post-practice on Day2, and at the retention and transfer tests on Day 7.]

Вторичные конечные точки (3)

• Intrinsic Motivation Inventory (IMI) [Срок оценки: Immediately post-practice on Day 1 and Day 2]
• Change in Corticospinal Excitability/Inhibition [Срок оценки: At baseline before priming, immediately post-practice on Day 2, and on Day 7]
• Change in Error Estimation Accuracy (EE) [Срок оценки: Post-practice on Day 2, and after tests on Day7]

Критерии участия

Критерии включения

• Healthy adults aged 18-35 years
• Right-handed (per Edinburgh Handedness Inventory)
• Normal or corrected-to-normal vision and hearing
• Eligible for non-invasive brain stimulation per safety screening (no contraindications to TMS)
• Able to understand study procedures and provide written informed consent in Chinese
• Willing to comply with all study visits and tasks, including TBS/rTMS and motor practice
• For yoked pairing: able to be matched to a counterpart participant for practice parameters

Критерии исключения

• History of epilepsy, seizures, or unexplained fainting; family history of epilepsy in first-degree relatives
• Any intracranial metal or implanted medical devices (e.g., cochlear implant, deep brain stimulator, aneurysm clips); non-removable metallic objects in head/neck
• Cardiac pacemaker or other implanted electronic devices
• Current or past major neurological or psychiatric disorders (e.g., stroke, traumatic brain injury, multiple sclerosis, major depression, bipolar disorder, schizophrenia)
• Current use of medications lowering seizure threshold or affecting cortical excitability (e.g., tricyclic antidepressants, bupropion, clozapine, lithium, stimulant or sedative-hypnotic abuse); or unstable psychotropic regimens
• Active migraine with aura or chronic severe headaches
• Pregnancy or planning pregnancy during participation; breastfeeding (if your site policy excludes)
• Substance or alcohol use disorder within the past 12 months; positive alcohol/drug screen on visit days
• Sleep deprivation (<5 hours) on the day before stimulation, or excessive caffeine (>400 mg) within 6 hours pre-stimulation
• Dermatologic conditions or open wounds at stimulation or EMG/electrode sites
• Prior extensive training on the specific motor task used in this study (risk of ceiling effects)
• Concurrent participation in another interventional study or received brain stimulation (TMS/tDCS) within the past 3 months
• Any condition that, in the investigator's judgment, makes participation unsafe or data unreliable

Критерии приведены из реестра в оригинале (на английском). Окончательную оценку соответствия проводит исследовательский центр.

Здоровые добровольцы: Да

Дизайн исследования

Распределение

Нерандомизированное

Модель

Параллельные группы

Маскирование

Открытое

Основная цель

Фундаментальное исследование

Центры проведения

Тайвань · 1 центр

• National Taiwan University Hospital — Taipei

Идентификаторы

NCT: NCT07197346 · 202506021RINB

Первоисточники (государственные реестры)

• ClinicalTrials.gov (NIH, США)

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