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Brain Sciences

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https://www.readbyqxmd.com/read/27916831/long-term-task-and-dopamine-dependent-dynamics-of-subthalamic-local-field-potentials-in-parkinson-s-disease
#1
Sara J Hanrahan, Joshua J Nedrud, Bradley S Davidson, Sierra Farris, Monique Giroux, Aaron Haug, Mohammad H Mahoor, Anne K Silverman, Jun Jason Zhang, Adam Olding Hebb
Subthalamic nucleus (STN) local field potentials (LFP) are neural signals that have been shown to reveal motor and language behavior, as well as pathological parkinsonian states. We use a research-grade implantable neurostimulator (INS) with data collection capabilities to record STN-LFP outside the operating room to determine the reliability of the signals over time and assess their dynamics with respect to behavior and dopaminergic medication. Seven subjects were implanted with the recording augmented deep brain stimulation (DBS) system, and bilateral STN-LFP recordings were collected in the clinic over twelve months...
November 29, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27886079/cerebellar-intermittent-theta-burst-stimulation-and-motor-control-training-in-individuals-with-cervical-dystonia
#2
Lynley V Bradnam, Michelle N McDonnell, Michael C Ridding
BACKGROUND: There is emerging evidence that cervical dystonia is a neural network disorder with the cerebellum as a key node. The cerebellum may provide a target for neuromodulation as a therapeutic intervention in cervical dystonia. OBJECTIVE: This study aimed to assess effects of intermittent theta-burst stimulation of the cerebellum on dystonia symptoms, quality of life, hand motor dexterity and cortical neurophysiology using transcranial magnetic stimulation...
November 23, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27827903/no-effect-of-cathodal-transcranial-direct-current-stimulation-on-fear-memory-in-healthy-human-subjects
#3
Aditya Mungee, Max Burger, Malek Bajbouj
BACKGROUND: Studies have demonstrated that fear memories can be modified using non-invasive methods. Recently, we demonstrated that anodal transcranial direct current stimulation (tDCS) of the right dorsolateral prefrontal cortex is capable of enhancing fear memories. Here, we examined the effects of cathodal tDCS of the right dorsolateral prefrontal cortex during fear reconsolidation in humans. METHODS: Seventeen young, healthy subjects were randomly assigned to two groups, which underwent fear conditioning with mild electric stimuli paired with a visual stimulus...
November 4, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27827888/long-term-plasticity-in-reflex-excitability-induced-by-five-weeks-of-arm-and-leg-cycling-training-after-stroke
#4
Taryn Klarner, Trevor S Barss, Yao Sun, Chelsea Kaupp, Pamela M Loadman, E Paul Zehr
Neural connections remain partially viable after stroke, and access to these residual connections provides a substrate for training-induced plasticity. The objective of this project was to test if reflex excitability could be modified with arm and leg (A & L) cycling training. Nineteen individuals with chronic stroke (more than six months postlesion) performed 30 min of A & L cycling training three times a week for five weeks. Changes in reflex excitability were inferred from modulation of cutaneous and stretch reflexes...
November 3, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27827835/prediction-of-walking-and-arm-recovery-after-stroke-a-critical-review
#5
REVIEW
Li Khim Kwah, Robert D Herbert
Clinicians often base their predictions of walking and arm recovery on multiple predictors. Multivariate prediction models may assist clinicians to make accurate predictions. Several reviews have been published on the prediction of motor recovery after stroke, but none have critically appraised development and validation studies of models for predicting walking and arm recovery. In this review, we highlight some common methodological limitations of models that have been developed and validated. Notable models include the proportional recovery model and the PREP algorithm...
November 2, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27801790/prenatal-alcohol-exposure-affects-progenitor-cell-numbers-in-olfactory-bulbs-and-dentate-gyrus-of-vervet-monkeys
#6
Mark W Burke, Alexey Inyatkin, Maurice Ptito, Frank R Ervin, Roberta M Palmour
Fetal alcohol exposure (FAE) alters hippocampal cell numbers in rodents and primates, and this may be due, in part, to a reduction in the number or migration of neuronal progenitor cells. The olfactory bulb exhibits substantial postnatal cellular proliferation and a rapid turnover of newly formed cells in the rostral migratory pathway, while production and migration of postnatal neurons into the dentate gyrus may be more complex. The relatively small size of the olfactory bulb, compared to the hippocampus, potentially makes this structure ideal for a rapid analysis...
October 27, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27792175/the-relationship-between-estrogen-and-nitric-oxide-in-the-prevention-of-cardiac-and-vascular-anomalies-in-the-developing-zebrafish-danio-rerio
#7
Benjamin G Sykes, Peter M Van Steyn, Jonathan D Vignali, John Winalski, Julie Lozier, Wade E Bell, James E Turner
It has been known that both estrogen (E2) and nitric oxide (NO) are critical for proper cardiovascular system (CVS) function. It has also been demonstrated that E2 acts as an upstream effector in the nitric oxide (NO) pathway. Results from this study indicate that the use of a nitric oxide synthase (NOS) inhibitor (NOSI) which targets specifically neuronal NOS (nNOS or NOS1), proadifen hydrochloride, caused a significant depression of fish heart rates (HR) accompanied by increased arrhythmic behavior. However, none of these phenotypes were evident with either the inhibition of endothelial NOS (eNOS) or inducible NOS (iNOS) isoforms...
October 26, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27775648/language-problems-and-adhd-symptoms-how-specific-are-the-links
#8
Erin Hawkins, Susan Gathercole, Duncan Astle, The Calm Team, Joni Holmes
Symptoms of inattention and hyperactivity frequently co-occur with language difficulties in both clinical and community samples. We explore the specificity and strength of these associations in a heterogeneous sample of 254 children aged 5 to 15 years identified by education and health professionals as having problems with attention, learning and/or memory. Parents/carers rated pragmatic and structural communication skills and behaviour, and children completed standardised assessments of reading, spelling, vocabulary, and phonological awareness...
October 21, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27775599/corticospinal-excitability-in-children-with-congenital-hemiparesis
#9
Chao-Ying Chen, Tonya L Rich, Jessica M Cassidy, Bernadette T Gillick
Transcranial magnetic stimulation (TMS) can be used as an assessment or intervention to evaluate or influence brain activity in children with hemiparetic cerebral palsy (CP) commonly caused by perinatal stroke. This communication report analyzed data from two clinical trials using TMS to assess corticospinal excitability in children and young adults with hemiparetic CP. The results of this communication revealed a higher probability of finding a motor evoked potential (MEP) on the non-lesioned hemisphere compared to the lesioned hemisphere (p = 0...
October 20, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27735866/vocal-tremor-novel-therapeutic-target-for-deep-brain-stimulation
#10
Vinod K Ravikumar, Allen L Ho, Jonathon J Parker, Elizabeth Erickson-DiRenzo, Casey H Halpern
Tremulous voice is characteristically associated with essential tremor, and is referred to as essential vocal tremor (EVT). Current estimates suggest that up to 40% of individuals diagnosed with essential tremor also present with EVT, which is associated with an impaired quality of life. Traditional EVT treatments have demonstrated limited success in long-term management of symptoms. However, voice tremor has been noted to decrease in patients receiving deep brain stimulation (DBS) with the targeting of thalamic nuclei...
October 10, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27740600/disorders-of-consciousness-painless-or-painful-conditions-evidence-from-neuroimaging-studies
#11
Francesca Pistoia, Simona Sacco, Janet Stewart, Marco Sarà, Antonio Carolei
The experience of pain in disorders of consciousness is still debated. Neuroimaging studies, using functional Magnetic Resonance Imaging (fMRI), Positron Emission Tomography (PET), multichannel electroencephalography (EEG) and laser-evoked potentials, suggest that the perception of pain increases with the level of consciousness. Brain activation in response to noxious stimuli has been observed in patients with unresponsive wakefulness syndrome (UWS), which is also referred to as a vegetative state (VS), as well as those in a minimally conscious state (MCS)...
October 8, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27740598/rescue-procedures-after-suboptimal-deep-brain-stimulation-outcomes-in-common-movement-disorders
#12
Adam M Nagy, Christopher M Tolleson
Deep brain stimulation (DBS) is a unique, functional neurosurgical therapy indicated for medication refractory movement disorders as well as some psychiatric diseases. Multicontact electrodes are placed in "deep" structures within the brain with targets varying depending on the surgical indication. An implanted programmable pulse generator supplies the electrodes with a chronic, high frequency electrical current that clinically mimics the effects of ablative lesioning techniques. DBS's efficacy has been well established for its movement disorder indications (Parkinson's disease, essential tremor, and dystonia)...
October 8, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27706022/the-cluster-variation-method-a-primer-for-neuroscientists
#13
Alianna J Maren
Effective Brain-Computer Interfaces (BCIs) require that the time-varying activation patterns of 2-D neural ensembles be modelled. The cluster variation method (CVM) offers a means for the characterization of 2-D local pattern distributions. This paper provides neuroscientists and BCI researchers with a CVM tutorial that will help them to understand how the CVM statistical thermodynamics formulation can model 2-D pattern distributions expressing structural and functional dynamics in the brain. The premise is that local-in-time free energy minimization works alongside neural connectivity adaptation, supporting the development and stabilization of consistent stimulus-specific responsive activation patterns...
September 30, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27618110/deep-brain-stimulation-in-search-of-reliable-instruments-for-assessing-complex-personality-related-changes
#14
Christian Ineichen, Heide Baumann-Vogel, Markus Christen
During the last 25 years, more than 100,000 patients have been treated with Deep Brain Stimulation (DBS). While human clinical and animal preclinical research has shed light on the complex brain-signaling disturbances that underpin e.g., Parkinson's disease (PD), less information is available when it comes to complex psychosocial changes following DBS interventions. In this contribution, we propose to more thoroughly investigate complex personality-related changes following deep brain stimulation through refined and reliable instruments in order to help patients and their relatives in the post-surgery phase...
September 7, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27618109/investigation-into-deep-brain-stimulation-lead-designs-a-patient-specific-simulation-study
#15
Fabiola Alonso, Malcolm A Latorre, Nathanael Göransson, Peter Zsigmond, Karin Wårdell
New deep brain stimulation (DBS) electrode designs offer operation in voltage and current mode and capability to steer the electric field (EF). The aim of the study was to compare the EF distributions of four DBS leads at equivalent amplitudes (3 V and 3.4 mA). Finite element method (FEM) simulations (n = 38) around cylindrical contacts (leads 3389, 6148) or equivalent contact configurations (leads 6180, SureStim1) were performed using homogeneous and patient-specific (heterogeneous) brain tissue models. Steering effects of 6180 and SureStim1 were compared with symmetric stimulation fields...
September 7, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27589813/deep-brain-stimulation-in-huntington-s-disease-preliminary-evidence-on-pathophysiology-efficacy-and-safety
#16
REVIEW
Lars Wojtecki, Stefan Jun Groiss, Christian Johannes Hartmann, Saskia Elben, Sonja Omlor, Alfons Schnitzler, Jan Vesper
Huntington's disease (HD) is one of the most disabling degenerative movement disorders, as it not only affects the motor system but also leads to cognitive disabilities and psychiatric symptoms. Deep brain stimulation (DBS) of the pallidum is a promising symptomatic treatment targeting the core motor symptom: chorea. This article gives an overview of preliminary evidence on pathophysiology, safety and efficacy of DBS in HD.
August 30, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27571109/spatial-memory-activity-distributions-indicate-the-hippocampus-operates-in-a-continuous-manner
#17
Brittany M Jeye, Jessica M Karanian, Scott D Slotnick
There is a long-standing debate as to whether recollection is a continuous/graded process or a threshold/all-or-none process. In the current spatial memory functional magnetic resonance imaging (fMRI) study, we examined the hippocampal activity distributions-the magnitude of activity as a function of memory strength-to determine the nature of processing in this region. During encoding, participants viewed abstract shapes in the left or right visual field. During retrieval, old shapes were presented at fixation and participants classified each shape as previously in the "left" or "right" visual field followed by an "unsure"-"sure"-"very sure" confidence rating...
August 26, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27563927/three-class-eeg-based-motor-imagery-classification-using-phase-space-reconstruction-technique
#18
Ridha Djemal, Ayad G Bazyed, Kais Belwafi, Sofien Gannouni, Walid Kaaniche
Over the last few decades, brain signals have been significantly exploited for brain-computer interface (BCI) applications. In this paper, we study the extraction of features using event-related desynchronization/synchronization techniques to improve the classification accuracy for three-class motor imagery (MI) BCI. The classification approach is based on combining the features of the phase and amplitude of the brain signals using fast Fourier transform (FFT) and autoregressive (AR) modeling of the reconstructed phase space as well as the modification of the BCI parameters (trial length, trial frequency band, classification method)...
August 23, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27548235/the-use-of-deep-brain-stimulation-in-tourette-syndrome
#19
REVIEW
Ladan Akbarian-Tefaghi, Ludvic Zrinzo, Thomas Foltynie
Tourette syndrome (TS) is a childhood neurobehavioural disorder, characterised by the presence of motor and vocal tics, typically starting in childhood but persisting in around 20% of patients into adulthood. In those patients who do not respond to pharmacological or behavioural therapy, deep brain stimulation (DBS) may be a suitable option for potential symptom improvement. This manuscript attempts to summarise the outcomes of DBS at different targets, explore the possible mechanisms of action of DBS in TS, as well as the potential of adaptive DBS...
August 19, 2016: Brain Sciences
https://www.readbyqxmd.com/read/27548234/deep-brain-stimulation-frequency-a-divining-rod-for-new-and-novel-concepts-of-nervous-system-function-and-therapy
#20
REVIEW
Erwin B Montgomery, Huang He
The efficacy of Deep Brain Stimulation (DBS) for an expanding array of neurological and psychiatric disorders demonstrates directly that DBS affects the basic electroneurophysiological mechanisms of the brain. The increasing array of active electrode configurations, stimulation currents, pulse widths, frequencies, and pulse patterns provides valuable tools to probe electroneurophysiological mechanisms. The extension of basic electroneurophysiological and anatomical concepts using sophisticated computational modeling and simulation has provided relatively straightforward explanations of all the DBS parameters except frequency...
August 17, 2016: Brain Sciences
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