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Open research questions in Neurological disorders and treatments

155 unresolved questions extracted from the limitations and future-work sections of 401 Neurological disorders and treatments papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Small sample size of 5 subjects, - Limited to individuals with PD, - No comparison to healthy controls

    Cortico-pallidal beta dynamics underlie impaired turning in Parkinson’s disease · 2026 · DOI

  • Next-generation neuromodulation strategies that dynamically disrupt pathological beta synchronization, - Further study of the oscillatory and connectivity dynamics that distinguish effective from impaired turning, - Investigation of the therapeutic potential of adaptive brain stimulation

    Cortico-pallidal beta dynamics underlie impaired turning in Parkinson’s disease · 2026 · DOI

  • The small size and lack of intrinsic contrast of the Ventralis Intermedius nucleus on MRI, making direct visualization challenging. The potential for complications, including radiation-induced events. The need for accurate targeting and dosing to ensure efficacy and minimize complications.

    Gamma knife thalamotomy for essential tremor in the third era of functional neurosurgery · 2026 · DOI

  • Prospective studies with larger sample sizes and longer follow-up periods are needed, - Studies comparing the efficacy of different radiosurgical techniques are needed, - Research on the optimal dose rate and treatment parameters is needed, - Studies on the long-term safety and efficacy of GKRS thalamotomy are needed

    Gamma knife thalamotomy for essential tremor in the third era of functional neurosurgery · 2026 · DOI

  • Investigate the effects of 4 Hz STN DBS on cognitive performance in larger samples. Examine the long-term effects of 4 Hz STN DBS on cognitive function. Explore the potential of low-frequency brain stimulation for other cognitive disorders.

    Theta deep-brain stimulation improves cognitive performance in Parkinson’s patients with cognitive impairments · 2026 · DOI

  • There are few reliable treatments for cognitive symptoms in PD patients. Cognitive impairment may disqualify patients from highly effective therapies for motor symptoms such as deep-brain stimulation.

    Theta deep-brain stimulation improves cognitive performance in Parkinson’s patients with cognitive impairments · 2026 · DOI

  • The study faced challenges due to the heterogeneity of the included studies, including differences in study designs, outcome parameters, and physiotherapy protocols. The study also faced challenges due to the lack of a control group in some of the included studies.

    The effect of physical activity on Parkinson’s disease outcomes in patients with bilateral subthalamic nucleus deep brain stimulation: a systematic review · 2026 · DOI

  • Limited number of available studies on the topic, - Heterogeneity of demographic features and physiotherapy protocols, - Lack of a control group in some protocols

    The effect of physical activity on Parkinson’s disease outcomes in patients with bilateral subthalamic nucleus deep brain stimulation: a systematic review · 2026 · DOI

  • Small sample size of 39 patients - Limited to PD patients with bilateral STN-DBS - No comparison with other types of DBS or treatments

    Theta-frequency subthalamic nucleus deep brain stimulation selectively improves visual attention in Parkinson’s disease · 2026 · DOI

  • Investigate the effects of low-frequency DBS on other cognitive functions - Compare the effects of low-frequency DBS with other types of DBS or treatments - Study the long-term effects of low-frequency DBS on visual attention

    Theta-frequency subthalamic nucleus deep brain stimulation selectively improves visual attention in Parkinson’s disease · 2026 · DOI

  • One of the challenges is the need for more precise and individualized targeting of dysfunctional networks in psychiatric disorders. Another challenge is the limited efficacy of current treatments and the need for more effective and acceptable treatments. The paper also highlights the challenge of integrating neurophysiological, neuroimaging, and genetic data to optimize treatment protocols.

    Neuromodulation and neural networks in psychiatric disorders: current status and emerging prospects · 2025 · DOI

  • Small samples and protocol variabilities in some studies - Inconclusive evidence due to small samples - Need for more precise, individualised targeting of dysfunctional networks

    Neuromodulation and neural networks in psychiatric disorders: current status and emerging prospects · 2025 · DOI

  • Investigate the long-term effects of DBS treatment, - Compare the effects of different DBS targets on the limbic network, - Examine the relationship between DBS treatment and clinical outcomes in patients with MDD

    Deep brain stimulation modulates directional limbic connectivity in major depressive disorder · 2025 · DOI

  • There is a lack of understanding of how DBS exerts its antidepressive effects in patients with MDD. Previous studies have identified changes in functional connectivity after DBS treatment, but the directionality of these changes is not well understood.

    Deep brain stimulation modulates directional limbic connectivity in major depressive disorder · 2025 · DOI

  • Background: Deep brain stimulation of the medial forebrain bundle (mfb DBS) is a promising intervention for psychiatric disorders, but the neurochemical mechanisms underlying its effects remain incompletely understood.

    Spatiotemporal characterization of corticolimbic dopamine and noradrenaline signaling and affective state modulation by mfb stimulation · 2026 · DOI

  • Antimuscarinic drugs are among the most effective pharmacological treatments for dystonia, yet the neural substrates underlying their therapeutic effects remain poorly understood.

    Striatal cholinergic interneuron pathology and muscarinic signaling independently shape motor dysfunction in a DYT-TOR1A dystonia model · 2026 · DOI

  • Whether motor dysfunction arises from ChI degeneration, dysfunction of surviving ChI, or altered cholinergic signaling elsewhere in the striatal circuit remains unknown.

    Striatal cholinergic interneuron pathology and muscarinic signaling independently shape motor dysfunction in a DYT-TOR1A dystonia model · 2026 · DOI

  • Although early findings are promising, the safety of these approaches remains underexplored.

    Safety of Intracranial Neuromodulation in Drug-Resistant Pediatric and Adult Epilepsy · 2026 · DOI

  • Deep brain stimulation (DBS) is currently widely used in the clinical management of motor symptoms in moderate-to-advanced Parkinson's disease; however, its complete regulatory mechanisms remain to be thoroughly elucidated.

    Research Progress on the Pathogenesis of Parkinson's Disease and the Neuroregulatory Mechanism of Deep Brain Stimulation Based on Animal Models · 2026 · DOI

  • Therefore, a thorough investigation of neural substrates underlying stimulation effects on dystonia signs and symptoms is warranted.

    Engaging dystonia networks with subthalamic stimulation · 2025 · DOI

  • However, optimal targeting within this structure and its surroundings have not been studied in depth.

    Engaging dystonia networks with subthalamic stimulation · 2025 · DOI

  • There are limited data on the relative rates of complications after DBS across different indications and targets in children.

    Surgical Complications of Deep Brain Stimulation in Children Across Targets and Indications · 2025 · DOI

  • Subcortical regions, relaying signals from peripheral interoceptors to cortical structures, are particularly understudied and how visceral information is processed in thalamic and subthalamic structures remains largely unknown.

    Single neurons in the thalamus and subthalamic nucleus process cardiac and respiratory signals in humans · 2024 · DOI

  • While visceral processes at the cortical level have been extensively studied using non-invasive imaging techniques, very few studies have investigated how this information is processed at the single neuron level, both in humans and animals.

    Single neurons in the thalamus and subthalamic nucleus process cardiac and respiratory signals in humans · 2024 · DOI

  • Using the application of deep brain stimulation (DBS) for cases of mental illness as an example, the paper explores how a relational approach to analysis brings forward important ethical and social issues warranting further scrutiny.

    Rethinking human–technology relations: exploring the sociopolitical dimensions of invasive brain stimulation · 2024 · DOI

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155 open questions have been extracted from the limitations and future-work passages of 401 Neurological disorders and treatments 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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