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Open research questions in Neurological disorders and treatments

715 gap statements mined from Neurological disorders and treatments papers in our 7.9M-paper local library, which holds 2,680 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The need for a sustained release formulation of levodopa that can provide consistent plasma concentrations. The lack of clinical data on the efficacy and safety of IPX203 in patients with Parkinson's disease and motor fluctuations. The need for a dosing algorithm for converting patients from immediate-release levodopa/carbidopa to IPX203.

    Early clinical experience with IPX203 in Parkinson’s disease with motor fluctuations · 2026 · DOI

  • The study is limited by its single-case report design, which limits generalizability and precludes causal inference. The use of serial psychiatrist-led clinical interviews to assess pedophilic symptoms introduces subjectivity and limits cross-study comparability. The study highlights the need for longer follow-up in additional patients and the use of validated longitudinal assessment tools.

    Incidental resolution of pedophilia in a patient undergoing deep brain stimulation (DBS) for obsessive-compulsive disorder (OCD): a case report and long-term follow-up · 2026 · DOI

  • There is no established method for predicting the outcomes after DBS surgery. The effectiveness of DBS varies among individuals, and the current predictors are not sufficient. The paper identifies the need for a reliable predictor of motor outcome after DBS surgery.

    Midbrain length by the one-line method predicts motor outcome after deep brain stimulation in Parkinson’s disease · 2026 · DOI

  • Long-term data on the efficiency of pallidal deep brain stimulation in DYT-GNAL and 18p deletion syndrome associated dystonia is scarce. There is a lack of systematic evaluation of pharmacological treatment, including levodopa, in these patients.

    Long-term efficiency of pallidal DBS and the role of Levodopa treatment in DYT-GNAL and 18p deletion syndrome associated dystonia: an observational study and review of literature · 2026 · DOI

  • The need for a more nuanced understanding of Parkinson's disease and its treatment, and the role of terminology in improving patient outcomes. The challenge of changing the terminology and its potential impact on patient willingness to engage with device-aided therapy.

    Beyond “Advanced”: proposing Fluctuation-Dominant Parkinson’s disease as a functional alternative to enable timely device-aided therapy · 2026 · DOI

  • The relationship between depressive symptoms and mortality in PD patients is not well understood. Prior studies have not fully considered the impact of cognitive and demographic factors on mortality in PD patients.

    The impact of depressive symptoms on 5-year all-cause mortality in patients with parkinson’s disease treated with and without deep brain stimulation · 2026 · DOI

  • Limited understanding of the genetic etiology of primary dystonia. Lack of studies comparing the clinical, imaging, and genetic characteristics of different cohorts with KMT2B-related dystonia.

    Clinical, imaging and genetic profile of KMT2B-related dystonia: a review of published cases · 2026 · DOI

  • Limited information on the clinical features and risk factors associated with tardive cervical dystonia. Lack of understanding of the clinical phenomenology of tardive cervical dystonia. Need to differentiate tardive cervical dystonia from other tardive syndromes and idiopathic cervical dystonia.

    Tardive cervical dystonia · 2026 · DOI

  • Lack of awareness. Limited availability of specialized centers. Need for precise target selection and multidisciplinary approach.

    Deep brain stimulation for Parkinson’s disease in India: an expert consensus on availability, affordability, and eligibility by the Parkinson’s research alliance India (PRAI) · 2026 · DOI

  • The study identifies the challenge of predicting which stimulation settings will provide optimal tremor control while avoiding disabling motor complications. The researchers note the difficulty in anticipating and accounting for stimulation-induced gait ataxia during routine programming. The study highlights the need to balance tremor benefit and gait ataxia risk in deep brain stimulation for essential tremor.

    Probabilistic mapping of tremor control and gait ataxia risk in deep brain stimulation · 2026 · DOI

  • The current understanding of the relationship between stimulation location and verbal fluency outcomes is limited. There is a need to identify stimulation regions that optimize motor benefits while minimizing negative impacts on verbal fluency.

    N-of-1 tissue activation modeling reveals regional subthalamic stimulation predicting verbal fluency decline in Parkinson disease · 2026 · DOI

  • The review notes the challenge of identifying patients with late-onset THAP1 dystonia, due to the lack of awareness and underrecognition of this condition. The review also notes the challenge of synthesizing data from heterogeneous case-based evidence.

    Expanding the phenotypic spectrum of THAP1 dystonia: a scoping review with an illustrative case of late-onset focal limb dystonia · 2026 · DOI

  • There is a lack of understanding of the psychosocial correlates of focal dystonia. The study aims to fill this gap by examining the psychosocial correlates of different forms of focal dystonia.

    Psychosocial and body image alterations associated with focal dystonia · 2026 · DOI

  • There is limited literature on isolated lingual dystonia. Most cases of ILD are deemed idiopathic, with few studies including genetic testing in their workup. The current literature is based only on case reports/series, limiting epidemiologic characterization.

    X-linked dystonia parkinsonism as a cause of isolated lingual dystonia (ILD) · 2026 · DOI

  • ILD can be disabling and cause speech and swallowing difficulties. Diagnosis may be substantially delayed due to patients first presenting to non-neurologists. The rarity of ILD and limited literature make it challenging to recognize and diagnose.

    X-linked dystonia parkinsonism as a cause of isolated lingual dystonia (ILD) · 2026 · DOI

  • Single-case report, - Limited generalizability, - No formal neurocognitive battery was administered, - Cognitive status was evaluated clinically, - Longitudinal change in pedophilic symptoms was assessed through serial psychiatrist-led clinical…

    Incidental resolution of pedophilia in a patient undergoing deep brain stimulation (DBS) for obsessive-compulsive disorder (OCD): a case report and long-term follow-up · 2026 · DOI

  • Investigation of other factors that predict postoperative symptom improvement is needed, - Development of an established evaluation method…

    Midbrain length by the one-line method predicts motor outcome after deep brain stimulation in Parkinson’s disease · 2026 · DOI

  • Investigate the relationship between upper limb motor performances and gait dynamics in other types of tremors or motor disorders, - Develop a wearable sensor-based protocol for tremor quantification and motor function assessment, - Examine the potential of wearable sensors in clinical…

    The association between upper limb motor performances and gait dynamics in essential tremor: an emerging relationship · 2026 · DOI

  • Further investigation of bradykinesia in GNAL-related dystonia - Larger studies to confirm the effectiveness of GPi-DBS and levodopa treatment - Investigation of the underlying mechanisms of dystonia in DYT-GNAL and 18pdel-associated…

    Long-term efficiency of pallidal DBS and the role of Levodopa treatment in DYT-GNAL and 18p deletion syndrome associated dystonia: an observational study and review of literature · 2026 · DOI

  • The evidence that 'advanced PD' terminology generates measurable barriers to care has reached a threshold that warrants formal, structured evaluation - The body of evidence needed to support a formal terminology recommendation does not yet exist…

    Beyond “Advanced”: proposing Fluctuation-Dominant Parkinson’s disease as a functional alternative to enable timely device-aided therapy · 2026 · DOI

  • Clinical criteria for identifying candidates are not always reliable in predicting surgical outcomes - The study does not provide a strict binary approach to recommend or deny the procedure - The absence of definitive guidelines for implementing DBS in India further hampers its accessibility…

    Deep brain stimulation for Parkinson’s disease in India: an expert consensus on availability, affordability, and eligibility by the Parkinson’s research alliance India (PRAI) · 2026 · DOI

  • The study had a limited sample size of 40 PD patients, - The study only analyzed patients who underwent bilateral STN DBS, - The study did not investigate other potential factors that could influence VF…

    N-of-1 tissue activation modeling reveals regional subthalamic stimulation predicting verbal fluency decline in Parkinson disease · 2026 · DOI

  • Further studies are needed to fully understand the phenotypic spectrum of DYT-THAP1, - Research on the genetic and environmental factors contributing to the variable expressivity of DYT-THAP1 is necessary, - Investigations into the optimal treatment strategies for late-onset DYT-THAP1…

    Expanding the phenotypic spectrum of THAP1 dystonia: a scoping review with an illustrative case of late-onset focal limb dystonia · 2026 · DOI

  • Investigate the underlying mechanisms of body image alterations in dystonia, - Examine the effectiveness of interventions targeting body image concerns in dystonia patients, - Explore the relationship between dystonia and other mental health…

    Psychosocial and body image alterations associated with focal dystonia · 2026 · DOI

  • Investigate the mechanistic interpretation of reduced lateral inhibition, - Examine the role of peripheral sensory afferents in other movement disorders, - Further study the relationship between sensory input and motor output…

    Mapping the peripheral sensory dimension of dystonia: a five-axis analysis · 2026 · DOI

Most-cited papers in Neurological disorders and treatments

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Open questions raised by papers listed on this page include: (1) The lack of clinical data on the efficacy and safety of IPX203 in patients with Parkinson's disease and motor fluctuations (“Early clinical experience with IPX203 in Parkinson’s disease with motor…”, 2026); (2) There is no established method for predicting the outcomes after DBS surgery (“Midbrain length by the one-line method predicts motor outcome after deep brain…”, 2026); (3) Long-term data on the efficiency of pallidal deep brain stimulation in DYT-GNAL and 18p deletion syndrome associated dystonia is scarce (“Long-term efficiency of pallidal DBS and the role of Levodopa treatment in…”, 2026); (4) The relationship between depressive symptoms and mortality in PD patients is not well understood (“The impact of depressive symptoms on 5-year all-cause mortality in patients…”, 2026); (5) Lack of studies comparing the clinical, imaging, and genetic characteristics of different cohorts with KMT2B-related dystonia (“Clinical, imaging and genetic profile of KMT2B-related dystonia: a review of…”, 2026). 715 gap statements have been mined from Neurological disorders and treatments papers in our 7.9M-paper local library, which holds 2,680 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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