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Open research questions in Transcranial Magnetic Stimulation Studies

71 unresolved questions extracted from the limitations and future-work sections of 433 Transcranial Magnetic Stimulation Studies papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Abstract Background Hemifacial spasm (HFS) is characterized by maladaptive brain plasticity, yet whether modulating this plasticity can alleviate symptoms remains unclear.

    Distal Electroacupuncture Modulates Maladaptive Brainstem and Motor Cortex Plasticity to Alleviate Hemifacial Spasm · 2026 · DOI

  • Transcranial magnetic stimulation (TMS) is widely used in both clinical and research settings to study and treat neurological and neuropsychiatric disorders, yet its underlying neural mechanisms remain unclear; particularly how stimulation influences both local and distant regional activity in relation to behavior.

    The Effect of Single Pulse TMS on Working Memory Performance: An Online TMS And fNIRS Study · 2026 · DOI

  • In particular, our model addresses both of the above challenges, by i) reconciling apparently contradictory results across modalities for the same stimulation parameters, and ii) introducing a simple algebraic approach, which we term the "equivalent energy principle", to defining corresponding (theta-burst) TMS and TFUS waveforms.

    Unifying transcranial focused ultrasound and transcranial magnetic stimulation effects with calcium-dependent synaptic plasticity theory · 2026 · DOI

  • Abstract Objective Depression is common in mesial temporal lobe epilepsy (mTLE), but its neuroanatomical basis—and overlap with major depressive disorder (MDD)—remains poorly defined.

    Preoperative limbic cortical thinning in mesial temporal lobe epilepsy surgical candidates is associated with pre‐existing and de novo postoperative depression · 2026 · DOI

  • Future studies could explore optimized stimulation parameters, longer intervention periods, and the inclusion of clinical populations—such as those with Alzheimer’s disease— to establish the therapeutic relevance of these differing stimulation paradigms. Although the present study was limited to a xed stimulation intensity and short-term exposure to the stimulation in healthy participants, these ndings provide an important proof of concept for modalityspecic gamma modulation.

    Comparing Vibrotactile Stimulation to Combined Visual and Auditory Stimulation for 40 Hz Gamma Entrainment · 2026 · DOI

  • Whether SO recovery is coupled to behavioral improvement, and whether pre-stroke network organization shapes recovery, has not been tested within individual animals.

    Acute Slow Oscillation Power as a Biomarker of Injury Severity After Photothrombotic Stroke: Dissociation from Week 1 Functional Recovery · 2026 · DOI

  • Bioinspired electromagnetic stimulation, in which fields are patterned after endogenous neural activity, have emerged as a potential non-invasive approach for modulating brain dynamics, yet the waveform parameters that determine biological specificity remain poorly defined.

    LTP-patterned electromagnetic stimulation induces NMDA receptor-dependent synaptic plasticity in cortical networks · 2026 · DOI

  • Complex electromagnetic patterns modeled after long-term potentiation (LTP) have been reported to alter learning and cortical injury outcomes in vivo, yet whether these fields engage cell-scale synaptic plasticity mechanisms remains unclear.

    LTP-patterned electromagnetic stimulation induces NMDA receptor-dependent synaptic plasticity in cortical networks · 2026 · DOI

  • However, the effect of concurrent application of transcranial direct current stimulation (tDCS) over the premotor cortex and peripheral nerve stimulation (PNS) during action observation on observation–execution‐related motor cortex excitability and motor performance and the underlying mechanism is lacking in the literature.

    Glutamatergic modulation of transcranial direct current stimulation over the premotor cortex combined with peripheral nerve stimulation promotes observation–execution‐related cortical excitability and motor performance · 2026 · DOI

  • Finally, sham validity over extended treatment schedules remains incompletely characterized. Existing support for time-resolved probes is concentrated in relatively few studies, and it remains uncertain when within-session probing pro- vides decisive information beyond end-of-study guesses across popu- lations, intensities, and montages (Turner et al.

    Sham tDCS controls: blinding, reliability, and a specification-grade checklist · 2026 · DOI

  • Although both modalities target nodes within the cortico-striato-thalamo-cortical (CSTC) circuit, their relative effectiveness has not been examined within a unified analytical framework.

    Comparative Efficacy of rTMS and Psychosurgery in Severe OCD: A Systematic Review and Meta-Analysis of Responder Rates · 2026 · DOI

  • BackgroundSpatial working memory (WM) relies on posterior parietal cortex (PPC) within a distributed fronto-parietal network, yet whether online anodal transcranial direct current stimulation (tDCS) of PPC modulates tactile WM, and how behavioral effects unfold over time, remains unclear.

    Time- and performance-dependent enhancement of tactospatial working memory caused by online anodal tDCS of the posterior parietal cortex · 2026 · DOI

  • Several limitations should be considered:  Variability in physiotherapy intensity and protocols across studies  Limited long-term follow-up in many trials  Inclusion of different neurological conditions, which may introduce clinical heterogeneity  Limited availability of biomarker-based neuroplasticity measures in some studies  Potential language bias due to inclusion of English-only studies Future trials should standardize intervention protocols and follow-up and advanced long-term neuroimaging outcomes.

    Synergistic Effects of Physiotherapy and Pharmacological Treatment on Neuroplasticity in Neurological Disorders: A Meta-Analysis · 2026 · DOI

  • This study has several methodological limitations that should be acknowledged when interpreting the findings. First, the sample size was not determined based on a formal a priori power analysis; instead, it was chosen to be comparable to those used in similar previous studies [6,7]. In particular, the sample size for CMEP measurements was even smaller, as stable responses could only be elicited from a subset of participants. Although this was largely due to the discomfort caused by the stimulation intensity, the possibility of selection bias cannot be ruled out. This limited sample size suggests that caution is warranted when generalizing our findings. Second, we did not assess potential changes in peripheral com- ponents across all experiments, as the M-max was not consistently recorded. Although we carefully positioned the surface electrodes to ensure consistency across experiments, we cannot entirely rule out the influence of day-to-day fluctuations in peripheral factors, such as the spatial relationship between the electrodes and the underlying muscle. Further, whereas there were no statistically significant differences in baseline MEP values between conditions in Experiment 1, some vari- ability was observed. It should be noted, however, that baseline EMG levels during the maximal voluntary contraction task showed no significant differences between conditions. Nonetheless, normalizing these values to the M-max would have provided clearer information regarding the relative size of the MEPs, which would have strengthened the reliability of our baseline comparisons. Third, the MT used to determine rPMS intensity was defined as the minimum stimulation intensity required to elicit a palpable muscle contraction. This definition can be more challenging to standardize than MT based on EMG activity, potentially raising concerns regarding reproducibility. However, to address this concern, we employed a procedure in which MT was determined independently by at least two experimenters and finalized only when a consensus was reached. Indeed, the MT values for the two rPMS conditions (0.8 × and 1.2 × MT) were comparable across different experimental days, indicating that the determination of MT was reproducible within participants across sessions. Despite its limitations, this pragmatic definition of MT may be advantageous in clinical settings, where simple and feasible criteria for determining rPMS intensity are required.

    Effects of different intensities of repetitive peripheral magnetic stimulation on corticospinal excitability and motor performance in healthy humans · 2026 · DOI

  • This study also has several limitations. In this paper, only 10 eli- gible studies were retrieved from Chinese and English databases. The limited number of empirical studies available for analysis restricts the explanatory power of the research results. Furthermore, implementing blinding in exercise interventions is challenging, and tDCS interven- tions involve multiple variable parameters (e.g., intensity, duration, stimulation site, and polarity), which complicates a unified interpreta- tion of the “joint effect.” These factors collectively contribute to the high heterogeneity of the present findings, warranting cautious inter- pretation. Future research should expand the empirical evidence in this field, focusing on potential dose–response relationships between different exercise programs and tDCS parameters, including the spe- cific effects of stimulus intensity, duration, location, polarity, and other variables.

    Can exercise combined with transcranial direct current stimulation improve cognitive function in older adults? A systematic review and meta-analysis · 2026 · DOI

  • Another limitation of the present study is the short observation period, as outcomes were assessed only at 24 h post-ischemia. Another limitation of this study is the relatively small sample size (n = 5 per group), which may reduce statistical power, particularly in the context of the inherent variability of experimental stroke models.

    The potential role of transcranial direct current stimulation in experimental ischemic stroke in adult male albino rats · 2026 · DOI

  • Stimulation prescriptions varied across trials (e.g., Several limitations should be noted. Although we restricted inclusion to RCTs, several outcome-specific analyses were based on small samples, leading to imprecise estimates and constituting the primary reason for downgrading certainty in the GRADE assessment. In addition, small studies may be more susceptible to publication bias, selective outcome reporting, and other reportingrelated biases, which can contribute to overestimation of treatment effects. Although standardized mean differences were calculated as Hedges’g to reduce small-sample bias in effect size estimation, this approach cannot correct for these broader sources of bias (68). Therefore, the pooled effects, particularly for outcomes supported by relatively small evidence bases, should be interpreted cautiously. target site, pattern/frequency, intensity, course length, and cumulative pulse dose), which may have influenced pooled effects; however, statistical heterogeneity was generally low to moderate and not uniform across outcomes. Differences in cognitive assessment instruments, together with figure-based data extraction for some studies, could have introduced measurement error, although sensitivity analyses supported the robustness of key findings. Trial registration or publicly available protocol information was limited for several included studies, which introduced uncertainty in the assessment of selective reporting bias. Most included studies were conducted in China, whereas the non- Chinese studies were relatively small, limiting the geographic and ethnic representativeness of the evidence base and reducing the generalizability of the findings. Baseline affective burden was variably reported across studies, and only a small number of trials contributed to the affective analyses. Because no individual participant data were available, we could not formally test whether depressive symptoms moderated or mediated the cognitive outcomes; therefore, mood improvement remains a potential source of confounding when interpreting the observed cognitive benefits. Adverse events were also incompletely and inconsistently reported, limiting the safety appraisal. One trial combined stimulation with Tai Chi, which may have introduced co-intervention effects and complicated attribution to rTMS alone.

    Efficacy of transcranial magnetic stimulation for mild cognitive impairment: a systematic review and meta-analysis of randomized controlled trials · 2026 · DOI

  • The majority of studies of M1 function have used extracellular electrophysiological or optical recordings to monitor AP firing. However, spiking is determined by an integration of both synaptic input and intrinsic membrane properties. A mech- anistic understanding of sensorimotor integration therefore requires direct measurement of Vm. To date, only a limited number of studies have recorded the Vm of motor cortical neurons during behavior using whole-cell recordings, including forelimb M1 [34,51], whisker M1 [87–89], and premotor cortex [36]. In the future, genetically encoded voltage sensors may enable more stable access to Vm activity [90,91]. Our study identified a central role of somatosensory input in the encoding of forelimb movement in the Vm of M1 neurons. While we used a nerve transection to remove somatosensory input, future work could build on the identification of new molecular markers for somatosensory afferent neuron subtypes [92] to dissect the relative contributions of proprio- ceptive compared to tactile inputs to M1 dynamics. Although somatosensory inputs have a significant role in M1 dynamics, a substantial amount of non-somatosensory synaptic input also contributes to M1 activity. Further work using cell-type and pathway-specific manipulations will be required to identify the contribution of inputs from other sensory and non-sensory pathways to M1 during behavior.

    Somatosensory input drives membrane potential dynamics in motor cortex during voluntary limb movement · 2026 · DOI

  • The excerpt does not contain a dedicated discussion section with explicit research gaps. The provided text consists primarily of references and author contributions from what appears to be an in-press article on portable transcranial alternating current stimulation (tACS) for major depressive disorder, but lacks the specific future work or limitations sections where concrete research gaps would typically be articulated.

    A multicenter randomized clinical trial of portable transcranial alternating current stimulation for major depressive disorder · 2026 · DOI

  • The complexity of the pathological mechanisms underlying PSD and the still developing nature and early-stage clinical experience with tACS and TUS may explain the lack of sufficient evidence for these modalities.

    Effects of noninvasive brain stimulation in the treatment of poststroke depression: an overview of systematic reviews · 2026 · DOI

  • Evidence from MAs/SRs on other forms of noninvasive brain stimulation, such as tACS and TUS, remains limited, and the current body of evidence is insufficient to support the routine clinical application of these two modalities in the treatment of PSD.

    Effects of noninvasive brain stimulation in the treatment of poststroke depression: an overview of systematic reviews · 2026 · DOI

  • MAs/SRs on NIBS for PSD exhibit limitation in reporting standardization, methodological quality, and the evidence level, with only one study utilizing the GRADE system for evidence credibility assessment.

    Effects of noninvasive brain stimulation in the treatment of poststroke depression: an overview of systematic reviews · 2026 · DOI

  • NIBS treatment protocols varied across studies, with differences in rTMS stimulation parameters such as frequency, intensity, and target area, making the isolation of the independent therapeutic effect of NIBS difficult.

    Effects of noninvasive brain stimulation in the treatment of poststroke depression: an overview of systematic reviews · 2026 · DOI

  • Further investigation of tDCS in OCD is warranted, to determine the optimal stimulation protocol (current, frequency, duration), longer-term effectiveness and brain-based mechanisms of effect.

    Feasibility, acceptability and practicality of transcranial stimulation in obsessive compulsive symptoms (FEATSOCS): A randomised controlled crossover trial · 2023 · DOI

  • Despite more than 25 years of research establishing the antidepressant efficacy of repetitive transcranial magnetic stimulation, there remains uncertainty about the depth and breadth of this evidence base, resulting in confusion as to where repetitive transcranial magnetic stimulation fits in the therapeutic armamentarium in the management of patients with mood disorders.

    The evidence is in: Repetitive transcranial magnetic stimulation is an effective, safe and well-tolerated treatment for patients with major depressive disorder · 2021 · DOI

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71 open questions have been extracted from the limitations and future-work passages of 433 Transcranial Magnetic Stimulation Studies papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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