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https://www.readbyqxmd.com/read/28819547/continuous-force-decoding-from-deep-brain-local-field-potentials-for-brain-computer-interfacing
#1
Syed A Shah, Huiling Tan, Peter Brown
Current Brain Computer Interface (BCI) systems are limited by relying on neuronal spikes and decoding limited to kinematics only. For a BCI system to be practically useful, it should be able to decode brain information on a continuous basis with low latency. This study investigates if force can be decoded from local field potentials (LFP) recorded with deep brain electrodes located at the Subthalamic nucleus (STN) using data from 5 patients with Parkinson's disease, on a continuous basis with low latency. A Wiener-Cascade (WC) model based decoder was proposed using both time-domain and frequency-domain features...
2017: International IEEE/EMBS Conference on Neural Engineering: [proceedings]
https://www.readbyqxmd.com/read/28807673/gpr55-a-therapeutic-target-for-parkinson-s-disease
#2
Marta Celorrio, Estefanía Rojo-Bustamante, Diana Fernández-Suárez, Elena Sáez, Ander Estella-Hermoso de Mendoza, Christa E Müller, María J Ramírez, Julen Oyarzábal, Rafael Franco, María S Aymerich
The GPR55 receptor is expressed abundantly in the brain, especially in the striatum, suggesting it might fulfill a role in motor function. Indeed, motor behavior is impaired in mice lacking GPR55, which also display dampened inflammatory responses. Abnormal-cannabidiol (Abn-CBD), a synthetic cannabidiol (CBD) isomer, is a GPR55 agonist that may serve as a therapeutic agent in the treatment of inflammatory diseases. In this study, we explored whether modulating GPR55 could also represent a therapeutic approach for the treatment of Parkinson's disease (PD)...
August 11, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28806716/efficient-hardware-implementation-of-the-subthalamic-nucleus-external-globus-pallidus-oscillation-system-and-its-dynamics-investigation
#3
Shuangming Yang, Xile Wei, Jiang Wang, Bin Deng, Chen Liu, Haitao Yu, Huiyan Li
Modeling and implementation of the nonlinear neural system with physiologically plausible dynamic behaviors are considerably meaningful in the field of computational neuroscience. This study introduces a novel hardware platform to investigate the dynamical behaviors within the nonlinear subthalamic nucleus-external globus pallidus system. In order to reduce the implementation complexities, a hardware-oriented conductance-based subthalamic nucleus (STN) model is presented, which can reproduce accurately the dynamical characteristics of biological conductance-based STN cells...
July 26, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28805564/deep-brain-stimulation-and-nonmotor-symptoms
#4
Elliot Hogg, Jeffrey Wertheimer, Sarah Graner, Michele Tagliati
Deep brain stimulation (DBS) is currently the treatment of choice for advanced Parkinson's disease (PD). Several brain targets, including the subthalamic nucleus and the globus pallidus internus, have been successfully employed, with excellent motor outcomes. Despite less established knowledge, DBS may be a powerful tool for managing a wide variety of nonmotor symptoms (NMS) in PD patients, either directly or indirectly due to motor benefit or reduction of dopaminergic drug load. After an assessment of global nonmotor outcomes of DBS, as measured by currently available clinical scales and questionnaires, this chapter will address DBS effects on four main NMS categories: neurobehavioral, including cognitive and neuropsychiatric symptoms, autonomic dysfunction, including orthostatic hypotension, constipation, and urinary dysfunction, sleep disturbances, including insomnia, REM sleep behavior disorder, and restless leg syndrome, to conclude with sensory symptoms, mainly focusing on pain...
2017: International Review of Neurobiology
https://www.readbyqxmd.com/read/28801341/tetrabenazine-and-subthalamic-stimulation-in-graft-induced-dyskinesias
#5
Ariel Levy, Alfonso Fasano
No abstract text is available yet for this article.
August 11, 2017: Neurology
https://www.readbyqxmd.com/read/28794978/localization-of-beta-and-high-frequency-oscillations-within-the-subthalamic-nucleus-region
#6
B C M van Wijk, A Pogosyan, M I Hariz, H Akram, T Foltynie, P Limousin, A Horn, S Ewert, P Brown, V Litvak
Parkinsonian bradykinesia and rigidity are typically associated with excessive beta band oscillations in the subthalamic nucleus. Recently another spectral peak has been identified that might be implicated in the pathophysiology of the disease: high-frequency oscillations (HFO) within the 150-400 Hz range. Beta-HFO phase-amplitude coupling (PAC) has been found to correlate with severity of motor impairment. However, the neuronal origin of HFO and its usefulness as a potential target for deep brain stimulation remain to be established...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28791332/deep-brain-stimulation-of-the-subthalamic-nucleus-selectively-decreases-risky-choice-in-risk-preferring-rats
#7
Wendy K Adams, Cole Vonder Haar, Melanie Tremblay, Paul J Cocker, Mason M Silveira, Sukhbir Kaur, Christelle Baunez, Catharine A Winstanley
Deep brain stimulation of the subthalamic nucleus (STN-DBS) can improve the motor symptoms of Parkinson's disease (PD) and negate the problematic side effects of dopamine replacement therapy. Although there is concern that STN-DBS may enhance the development of gambling disorder and other impulse control disorders in this patient group, recent data suggest that STN-DBS may actually reduce iatrogenic impulse control disorders, and alleviate obsessive-compulsive disorder (OCD). Here, we sought to determine whether STN-DBS was beneficial or detrimental to performance of the rat gambling task (rGT), a rodent analogue of the Iowa Gambling Task (IGT) used to assess risky decision making clinically...
July 2017: ENeuro
https://www.readbyqxmd.com/read/28772275/deep-brain-stimulation-for-tremor-is-there-a-common-structure
#8
Michael Fiechter, Andreas Nowacki, Markus F Oertel, Jens Fichtner, Ines Debove, M Lenard Lachenmayer, Roland Wiest, Claudio L Bassetti, Andreas Raabe, Alain Kaelin-Lang, Michael W Schüpbach, Claudio Pollo
BACKGROUND: Subthalamic nucleus (STN) stimulation has been recognized to control resting tremor in Parkinson disease. Similarly, thalamic stimulation (ventral intermediate nucleus; VIM) has shown tremor control in Parkinson disease, essential, and intention tremors. Recently, stimulation of the posterior subthalamic area (PSA) has been associated with excellent tremor control. Thus, the optimal site of stimulation may be located in the surrounding white matter. AIMS: The objective of this work was to investigate the area of stimulation by determining the contact location correlated with the best tremor control in STN/VIM patients...
August 4, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28765629/subthalamic-nucleus-stimulation-and-levodopa-modulate-cardiovascular-autonomic-function-in-parkinson-s-disease
#9
Kai Li, Rocco Haase, Heinz Rüdiger, Manja Reimann, Heinz Reichmann, Martin Wolz, Tjalf Ziemssen
We aimed to explore the effects of bilateral subthalamic nucleus stimulation and levodopa on cardiovascular autonomic function in Parkinson's disease. Twenty-six Parkinson's disease patients with bilateral subthalamic nucleus stimulation in a stable state were tested under stimulation off and dopaminergic medication off (OFF-OFF), stimulation on and dopaminergic medication off (ON-OFF), and stimulation on and medication (levodopa) on (ON-ON) conditions by recording continuously blood pressure, ECG, and respiration at rest, during metronomic deep breathing, and head-up tilt test...
August 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28761773/deep-brain-stimulation-in-parkinson-s-disease-new-and-emerging-targets-for-refractory-motor-and-nonmotor-symptoms
#10
REVIEW
Dustin Anderson, Grayson Beecher, Fang Ba
Parkinson's disease (PD) is a progressive neurodegenerative condition characterized by bradykinesia, tremor, rigidity, and postural instability (PI), in addition to numerous nonmotor manifestations. Many pharmacological therapies now exist to successfully treat PD motor symptoms; however, as the disease progresses, it often becomes challenging to treat with medications alone. Deep brain stimulation (DBS) has become a crucial player in PD treatment, particularly for patients who have disabling motor complications from medical treatment...
2017: Parkinson's Disease
https://www.readbyqxmd.com/read/28758044/deep-brain-stimulation-of-hemiparkinsonian-rats-with-unipolar-and-bipolar-electrodes-for-up-to-6-weeks-behavioral-testing-of-freely-moving-animals
#11
Kathrin Badstuebner, Ulrike Gimsa, Immo Weber, Armin Tuchscherer, Jan Gimsa
Although the clinical use of deep brain stimulation (DBS) is increasing, its basic mechanisms of action are still poorly understood. Platinum/iridium electrodes were inserted into the subthalamic nucleus of rats with unilateral 6-OHDA-induced lesions of the medial forebrain bundle. Six behavioral parameters were compared with respect to their potential to detect DBS effects. Locomotor function was quantified by (i) apomorphine-induced rotation, (ii) initiation time, (iii) the number of adjusting steps in the stepping test, and (iv) the total migration distance in the open field test...
2017: Parkinson's Disease
https://www.readbyqxmd.com/read/28755876/a-computational-network-analysis-based-on-targets-of-antipsychotic-agents
#12
Lei Gao, Shuo Feng, Zhao-Yuan Liu, Jiu-Qiang Wang, Ke-Ke Qi, Kai Wang
Currently, numerous antipsychotic agents have been developed in the area of pharmacological treatment of schizophrenia. However, the molecular mechanism underlying multi targets of antipsychotics were yet to be explored. In this study we performed a computational network analysis based on targets of antipsychotic agents. We retrieved a total of 96 targets from 56 antipsychotic agents. By expression enrichment analysis, we identified that the expressions of antipsychotic target genes were significantly enriched in liver, brain, blood and corpus striatum...
July 26, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28755172/micro-lesion-effect-of-the-globus-pallidus-internus-with-deep-brain-stimulation-in-parkinson-s-disease-patients
#13
Yi Wang, Peng Li, FeiLong Gong, Yuan Gao, Yang Y Xu, Wei Wang
BACKGROUND: The micro-lesion effect (MLE) has been observed in many Parkinson's disease (PD) patients after deep brain stimulation (DBS) surgery. For subthalamic nucleus (STN) stimulation, the MLE has been reported as a predictor of the long-term efficacy of DBS. However, the research on the MLE in the globus pallidus internus (GPi) is insufficient. In this report, we conducted a study of the correlation between the MLE and improvement of GPi DBS. METHODS: From July 2014 to November 2015, 36 PD patients underwent GPi DBS in our hospital...
July 28, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28742498/subthalamic-nucleus-gamma-activity-increases-not-only-during-movement-but-also-during-movement-inhibition
#14
Petra Fischer, Alek Pogosyan, Damian M Herz, Binith Cheeran, Alexander L Green, James Fitzgerald, Tipu Z Aziz, Jonathan Hyam, Simon Little, Thomas Foltynie, Patricia Limousin, Ludvic Zrinzo, Peter Brown, Huiling Tan
Gamma activity in the subthalamic nucleus (STN) is widely viewed as a pro-kinetic rhythm. Here we test the hypothesis that rather than being specifically linked to movement execution, gamma activity reflects dynamic processing in this nucleus. We investigated the role of gamma during fast stopping and recorded scalp electroencephalogram and local field potentials from deep brain stimulation electrodes in 9 Parkinson's disease patients. Patients interrupted finger tapping (paced by a metronome) in response to a stop-signal sound, which was timed such that successful stopping would occur only in ~50% of all trials...
July 25, 2017: ELife
https://www.readbyqxmd.com/read/28742497/causal-role-for-the-subthalamic-nucleus-in-interrupting-behavior
#15
Kathryn H Fife, Navarre A Gutierrez-Reed, Vivien Zell, Julie Bailly, Christina M Lewis, Adam R Aron, Thomas S Hnasko
Stopping or pausing in response to threats, conflicting information, or surprise is fundamental to behavior. Evidence across species has shown that the subthalamic nucleus (STN) is activated by scenarios involving stopping or pausing, yet evidence that the STN causally implements stops or pauses is lacking. Here we used optogenetics to activate or inhibit mouse STN to test its putative causal role. We first demonstrated that optogenetic stimulation of the STN excited its major projection targets. Next we showed that brief activation of STN projection neurons was sufficient to interrupt or pause a self-initiated bout of licking...
July 25, 2017: ELife
https://www.readbyqxmd.com/read/28735132/asleep-robot-assisted-surgery-for-the-implantation-of-subthalamic-electrodes-provides-the-same-clinical-improvement-and-therapeutic-window-as-awake-surgery
#16
Michel Lefranc, Yassine Zouitina, Mélissa Tir, Philippe Merle, Martial Ouendo, Jean-Marc Constans, Olivier Godefroy, Johann Peltier, Pierre Krystkowiak
OBJECTIVE: To study the impact of not performing an awake clinical evaluation during the robot-assisted implantation subthalamic nucleus deep brain stimulation (STN-DBS) electrodes on the stimulation parameters and clinical outcome in patients with Parkinson's disease (PD). METHODS: A total of 23 PD patients underwent robot-assisted surgery for the bilateral implantation of STN-DBS electrodes. Thirteen patients received general anesthesia (GA) and a limited intraoperative evaluation (side effects only), whereas 10 received local anesthesia and a full evaluation...
July 19, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28720127/parasomnia-overlap-disorder-parkinson-s-disease-and-subthalamic-deep-brain-stimulation-three-case-reports
#17
Panagiotis Bargiotas, Julia Muellner, W M Michael Schuepbach, Claudio L Bassetti
BACKGROUND: Parasomnia overlap disorder (POD) is a distinct parasomnia and characterized by concomitant manifestation of rapid-eye-movement (REM)- and non-REM (NREM)-parasomnias. Although not uncommon among patients with Parkinson's disease, POD is often under-investigated. CASE PRESENTATION: This is the first report of patients with PD and features of POD that underwent deep brain stimulation. Our patients exhibited different outcomes of POD features after subthalamic deep brain stimulation...
July 18, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28716237/long-term-follow-up-on-quality-of-life-and-its-relationship-to-motor-and-cognitive-functions-in-parkinson-s-disease-after-deep-brain-stimulation
#18
Tatsuya Yamamoto, Tomoyuki Uchiyama, Yoshinori Higuchi, Masato Asahina, Shigeki Hirano, Yoshitaka Yamanaka, Liu Weibing, Satoshi Kuwabara
INTRODUCTION: We aimed to examine temporal changes in health-related quality of life (HRQOL) and its relationship with motor and cognitive functions in patients with Parkinson's disease (PD) after subthalamic nucleus deep brain stimulation (STN-DBS). METHODS: In total, 31 patients with PD were enrolled in this study (mean age: 66.7±0.9years; mean disease duration: 11.6±3.7years). Participants completed the Unified Parkinson's Disease Rating Scale and the Parkinson's Disease Questionnaire-39...
August 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28712841/long-term-impact-of-subthalamic-stimulation-on-cognitive-function-in-patients-with-advanced-parkinson-s-disease
#19
M Acera, A Molano, B Tijero, G Bilbao, I Lambarri, R Villoria, J Somme, E Ruiz de Gopegui, I Gabilondo, J C Gomez-Esteban
OBJECTIVE: The aim of this study was to evaluate the effects of deep brain stimulation of the subthalamic nucleus (DBS-SN) on cognitive function in patients with Parkinson's disease (PD) 5 years after surgery. MATERIAL AND METHODS: We conducted a prospective study including 50 patients with PD who underwent DBS-SN (62.5% were men; mean age of 62.2±8.2 years; mean progression time of 14.1±6.3 years). All patients were assessed before the procedure and at one year after surgery; 40 patients were further followed up until the 5-year mark...
July 13, 2017: Neurología: Publicación Oficial de la Sociedad Española de Neurología
https://www.readbyqxmd.com/read/28711737/subthalamic-deep-brain-stimulation-sweet-spots-and-hyperdirect-cortical-connectivity-in-parkinson-s-disease
#20
Harith Akram, Stamatios N Sotiropoulos, Saad Jbabdi, Dejan Georgiev, Philipp Mahlknecht, Jonathan Hyam, Thomas Foltynie, Patricia Limousin, Enrico De Vita, Marjan Jahanshahi, Marwan Hariz, John Ashburner, Tim Behrens, Ludvic Zrinzo
OBJECTIVES: Firstly, to identify subthalamic region stimulation clusters that predict maximum improvement in rigidity, bradykinesia and tremor, or emergence of side-effects; and secondly, to map-out the cortical fingerprint, mediated by the hyperdirect pathways which predict maximum efficacy. METHODS: High angular resolution diffusion imaging in twenty patients with advanced Parkinson's disease was acquired prior to bilateral subthalamic nucleus deep brain stimulation...
July 12, 2017: NeuroImage
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