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https://www.readbyqxmd.com/read/29457647/learning-of-hierarchical-serial-patterns-emerges-in-infancy
#1
David J Lewkowicz, Mark A Schmuckler, Diane M J Mangalindan
Recursive, hierarchically organized serial patterns provide the underlying structure in many cognitive and motor domains including speech, language, music, social interaction, and motor action. We investigated whether learning of hierarchical patterns emerges in infancy by habituating 204 infants to different hierarchical serial patterns and then testing for discrimination and generalization of such patterns. Results indicated that 8- to 10-month-old and 12- to 14-month-old infants exhibited sensitivity to the difference between hierarchical and non-hierarchical structure but that 4- to 6-month-old infants did not...
February 19, 2018: Developmental Psychobiology
https://www.readbyqxmd.com/read/29456046/the-spectrum-of-off-in-parkinson-s-disease-what-have-we-learned-over-40-years
#2
REVIEW
Kelvin L Chou, Mark Stacy, Tanya Simuni, Janis Miyasaki, Wolfgang H Oertel, Kapil Sethi, Hubert H Fernandez, Fabrizio Stocchi
The terms "on" and "off" were used by Marsden and his contemporaries over 40 years ago to describe times when Parkinson's disease patients experienced good motor function ("on") and immobility ("off"). Yet there remains no published consensus definition of "off", leading clinicians and patients to develop individualized impressions of "off" determinations. In this paper, we first discuss the evolution of the terminology and understanding of "off" states since Marsden's time, which now include non-motor as well as motor symptoms...
February 2, 2018: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/29456026/neural-population-dynamics-underlying-motor-learning-transfer
#3
Saurabh Vyas, Nir Even-Chen, Sergey D Stavisky, Stephen I Ryu, Paul Nuyujukian, Krishna V Shenoy
Covert motor learning can sometimes transfer to overt behavior. We investigated the neural mechanism underlying transfer by constructing a two-context paradigm. Subjects performed cursor movements either overtly using arm movements, or covertly via a brain-machine interface that moves the cursor based on motor cortical activity (in lieu of arm movement). These tasks helped evaluate whether and how cortical changes resulting from "covert rehearsal" affect overt performance. We found that covert learning indeed transfers to overt performance and is accompanied by systematic population-level changes in motor preparatory activity...
February 13, 2018: Neuron
https://www.readbyqxmd.com/read/29455866/cognition-action-trade-offs-reflect-organization-of-attention-in-infancy
#4
Sarah E Berger, Regina T Harbourne, Melissa N Horger
This chapter discusses what cognition-action trade-offs in infancy reveal about the organization and developmental trajectory of attention. We focus on internal attention because this aspect is most relevant to the immediate concerns of infancy, such as fluctuating levels of expertise, balancing multiple taxing skills simultaneously, learning how to control attention under variable conditions, and coordinating distinct psychological domains. Cognition-action trade-offs observed across the life span include perseveration during skill emergence, errors and inefficient strategies during decision making, and the allocation of resources when attention is taxed...
2018: Advances in Child Development and Behavior
https://www.readbyqxmd.com/read/29455676/evaluation-of-an-ophthalmoscopy-simulator-to-teach-funduscopy-skills-to-pediatric-residents
#5
Elizabeth Kouzmitcheva, Stephanie A Grover, Tara Berenbaum, Asim Ali, Adelle Atkinson, E Ann Yeh
BACKGROUND: Medical school and residency training in ophthalmoscopic evaluation is limited, reducing diagnostic accuracy. We sought to evaluate the efficacy of self-study using an ophthalmoscopy simulator to improve the technical motor skills involved in direct funduscopy in postgraduate pediatric residents. METHODS: In this randomized-controlled study, 17 pediatric residents (postgraduate years 1-3) were randomized to control (n=8) or intervention (n=9) groups...
February 19, 2018: Canadian Journal of Neurological Sciences. le Journal Canadien des Sciences Neurologiques
https://www.readbyqxmd.com/read/29453101/can-higher-training-practice-dosage-with-treadmill-slip-perturbation-necessarily-reduce-risk-of-falls-following-overground-slip
#6
Anna Lee, Tanvi Bhatt, Xuan Liu, Yiru Wang, Yi-Chung Pai
BACKGROUND: Perturbation training is an emerging paradigm to reduce idiopathic falls (without clinical signs or symptoms) in older adults. While a higher threat dosage (intensity) in motor learning often directly relates to greater adaptation, retention, and generalization, little is known whether increasing the practice dosage (repetition) of slip-perturbation training would necessarily improve its outcomes. RESEARCH QUESTION: Can higher practice dosage of treadmill slip-perturbation training lead to greater generalization to an overground slip immediately after the training? METHODS: Forty-five community-dwelling older adults (73...
February 13, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29449805/screen-position-preference-offers-a-new-direction-for-action-observation-research-preliminary-findings-using-tms
#7
Martin Riach, David J Wright, Zoë C Franklin, Paul S Holmes
Action observation has been suggested to be an effective adjunct to physical practice in motor (re)learning settings. However, optimal viewing conditions for interventions are yet to be established. Single-pulse transcranial magnetic stimulation (TMS) was used to investigate the effect of two different screen positions and participants' screen position viewing preference on the amplitude of motor evoked potentials (MEPs) during observation of a ball pinch action. Twenty-four participants observed four blocked conditions that contained either a dynamic index finger-thumb ball pinch or a static hand holding a ball in a similar position on a horizontally or vertically positioned screen...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29449799/markov-switching-model-for-quick-detection-of-event-related-desynchronization-in-eeg
#8
Giuseppe Lisi, Diletta Rivela, Asuka Takai, Jun Morimoto
Quick detection of motor intentions is critical in order to minimize the time required to activate a neuroprosthesis. We propose a Markov Switching Model (MSM) to achieve quick detection of an event related desynchronization (ERD) elicited by motor imagery (MI) and recorded by electroencephalography (EEG). Conventional brain computer interfaces (BCI) rely on sliding window classifiers in order to perform online continuous classification of the rest vs. MI classes. Based on this approach, the detection of abrupt changes in the sensorimotor power suffers from an intrinsic delay caused by the necessity of computing an estimate of variance across several tenths of a second...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29448220/trunk-postural-balance-and-low-back-pain-reliability-and-relationship-with-clinical-changes-following-a-lumbar-stabilization-exercise-program
#9
Ali Shahvarpour, Dany Gagnon, Richard Preuss, Sharon M Henry, Christian Larivière
Lumbar stabilization programs reduce pain and disability, but the mechanisms of action underlying this treatment are unknown. Trunk postural control during unstable sitting represents a surrogate measure of motor control mechanisms involved to maintain the dynamic stability of the spine. This exploratory study aimed to determine the reliability of trunk postural control measures over an 8-week interval, their sensitivity to low back pain status and treatment and their relationship with clinical outcomes. Trunk postural control measures were determined in patients with low back pain before and after an 8-week lumbar stabilization exercise program...
February 9, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29446352/deep-learning-for-hybrid-eeg-fnirs-brain-computer-interface-application-to-motor-imagery-classification
#10
Antonio Maria Chiarelli, Pierpaolo Croce, Arcangelo Merla, Filippo Zappasodi
OBJECTIVE: Brain-Computer Interface (BCI) refers to procedures that
 link the central nervous system to a device. BCI was historically performed using
 Electroencephalography (EEG). In the last years, encouraging results were obtained
 by combining EEG with other neuroimaging technologies, such as functional Near
 Infrared Spectroscopy (fNIRS). A crucial step of BCI is brain state classication
 from recorded signal features. Deep Articial Neural Networks (DNNs) recently
 reached unprecedented complex classication outcomes...
February 15, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29445334/post-task-effects-on-eeg-brain-activity-differ-for-various-differential-learning-and-contextual-interference-protocols
#11
Diana Henz, Alexander John, Christian Merz, Wolfgang I Schöllhorn
A large body of research has shown superior learning rates in variable practice compared to repetitive practice. More specifically, this has been demonstrated in the contextual interference (CI) and in the differential learning (DL) approach that are both representatives of variable practice. Behavioral studies have indicate different learning processes in CI and DL. Aim of the present study was to examine immediate post-task effects on electroencephalographic (EEG) brain activation patterns after CI and DL protocols that reveal underlying neural processes at the early stage of motor consolidation...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29445188/daily-circadian-misalignment-impairs-human-cognitive-performance-task-dependently
#12
Sarah L Chellappa, Christopher J Morris, Frank A J L Scheer
Shift work increases the risk for human errors, such that drowsiness due to shift work has contributed to major industrial disasters, including Space Shuttle Challenger, Chernobyl and Alaska Oil Spill disasters, with extraordinary socio-economical costs. Overnight operations pose a challenge because our circadian biology inhibits cognitive performance at night. Yet how the circadian system modulates cognition over multiple days under realistic shift work conditions remains to be established. Importantly, because task-specific cognitive brain regions show different 24-h circadian dynamics, we hypothesize that circadian misalignment impacts cognition task-dependently...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29444426/inferior-olive-hcn1-channels-coordinate-synaptic-integration-and-complex-spike-timing
#13
Derek L F Garden, Marlies Oostland, Marta Jelitai, Arianna Rinaldi, Ian Duguid, Matthew F Nolan
Cerebellar climbing-fiber-mediated complex spikes originate from neurons in the inferior olive (IO), are critical for motor coordination, and are central to theories of cerebellar learning. Hyperpolarization-activated cyclic-nucleotide-gated (HCN) channels expressed by IO neurons have been considered as pacemaker currents important for oscillatory and resonant dynamics. Here, we demonstrate that in vitro, network actions of HCN1 channels enable bidirectional glutamatergic synaptic responses, while local actions of HCN1 channels determine the timing and waveform of synaptically driven action potentials...
February 13, 2018: Cell Reports
https://www.readbyqxmd.com/read/29443433/effects-of-anodal-transcranial-direct-current-stimulation-over-lower-limb-primary-motor-cortex-on-motor-learning-in-healthy-individuals
#14
Águida Foerster, Anirban Dutta, Min-Fang Kuo, Walter Paulus, Michael A Nitsche
Transcranial direct current stimulation (tDCS) is a neuromodulatory technique which alters motor functions in healthy humans and in neurological patients. Most studies so far investigated the effects of tDCS on mechanisms underlying improvements of upper limb performance. To investigate the effect of anodal tDCS over the lower limb motor cortex (M1) on lower limb motor learning in healthy volunteers, we conducted a randomized, single blind and sham-controlled study. Thirty three (25.81 ± 3.85, 14 female) volunteers were included, and received anodal or sham tDCS over the left M1 (M1-tDCS)...
February 14, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29441694/presynaptic-congenital-myasthenic-syndrome-with-altered-synaptic-vesicle-homeostasis-linked-to-compound-heterozygous-sequence-variants-in-rph3a
#15
Ricardo A Maselli, Jessica Vázquez, Leah Schrumpf, Juan Arredondo, Marian Lara, Jonathan B Strober, Peter Pytel, Robert L Wollmann, Michael Ferns
BACKGROUND: Monogenic defects of synaptic vesicle (SV) homeostasis have been implicated in many neurologic diseases, including autism, epilepsy, and movement disorders. In addition, abnormal vesicle exocytosis has been associated with several endocrine dysfunctions. METHODS: We report an 11 year old girl with learning disabilities, tremors, ataxia, transient hyperglycemia, and muscle fatigability responsive to albuterol sulfate. Failure of neuromuscular transmission was confirmed by single fiber electromyography...
February 14, 2018: Molecular Genetics & Genomic Medicine
https://www.readbyqxmd.com/read/29441579/brain-anatomy-of-the-4-day-old-european-rabbit
#16
Nanette Y Schneider, Frédérique Datiche, Gérard Coureaud
The European rabbit (Oryctolagus cuniculus) is a widely used model in fundamental, medical and veterinary neurosciences. Besides investigations in adults, rabbit pups are relevant to study perinatal neurodevelopment and early behaviour. To date, the rabbit is also the only species in which a pheromone - the mammary pheromone (MP) - emitted by lactating females and active on neonatal adaptation has been described. The MP is crucial since it contributes directly to nipple localisation and oral seizing in neonates, i...
February 14, 2018: Journal of Anatomy
https://www.readbyqxmd.com/read/29441005/atypical-within-session-motor-procedural-learning-after-traumatic-brain-injury-but-well-preserved-between-session-procedural-memory-consolidation
#17
Maria Korman, Sharon Shaklai, Keren Cisamariu, Carmit Gal, Rinatia Maaravi-Hesseg, Ishay Levy, Ofer Keren, Avi Karni, Yaron Sacher
Using the finger-to-thumb opposition sequence (FOS) learning task, we characterized motor skill learning in sub-acute patients hospitalized for rehabilitation following traumatic brain injury (TBI). Ten patients (Trained TBI) and 11 healthy participants (Trained Healthy) were trained using a multi-session protocol: a single session was afforded in the first week of the study, and four daily sessions were afforded during the second week. Intensity of practice was adapted to patients. Performance speed and accuracy were tested before and after each session...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29440694/mutations-in-the-drosophila-homolog-of-human-pla2g6-give-rise-to-age-dependent-loss-of-psychomotor-activity-and-neurodegeneration
#18
Konstantin G Iliadi, Oxana B Gluscencova, Natalia Iliadi, Gabrielle L Boulianne
Infantile neuroaxonal dystrophy (INAD) is a fatal neurodegenerative disorder that typically begins within the first few years of life and leads to progressive impairment of movement and cognition. Several years ago, it was shown that >80% of patients with INAD have mutations in the phospholipase gene, PLA2G6. Interestingly, mutations in PLA2G6 are also causative in two other related neurodegenerative diseases, atypical neuroaxonal dystrophy and Dystonia-parkinsonism. While all three disorders give rise to similar defects in movement and cognition, some defects are unique to a specific disorder...
February 13, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29439364/enhancement-of-motor-learning-by-focal-intermittent-theta-burst-stimulation-itbs-of-either-the-primary-motor-m1-or-somatosensory-area-s1-in-healthy-human-subjects
#19
Thomas Platz, Marija Adler-Wiebe, Sybille Roschka, Martin Lotze
BACKGROUND: Motor rehabilitation after brain damage relies on motor re-learning as induced by specific training. Non-invasive brain stimulation (NIBS) can alter cortical excitability and thereby has a potential to enhance subsequent training-induced learning. Knowledge about any priming effects of NIBS on motor learning in healthy subjects can help to design targeted therapeutic applications in brain-damaged subjects. OBJECTIVE: To examine whether complex motor learning in healthy subjects can be enhanced by intermittent theta burst stimulation (iTBS) to primary motor or sensory cortical areas...
2018: Restorative Neurology and Neuroscience
https://www.readbyqxmd.com/read/29434767/simvastatin-inhibits-the-apoptosis-of-hippocampal-cells-in-a-mouse-model-of-alzheimer-s-disease
#20
Xiaoqin Hu, Chengwei Song, Ming Fang, Chengyan Li
Alzheimer's disease is associated with cognitive impairments that affect memory and executive functions. Simvastatin is a cholesterol-lowering statin drug that is used to control levels of cholesterol in the blood, particularly in cases of hypercholesterolemia, and may be used in the treatment of aneurysmal subarachnoid hemorrhage. Previous results have indicated that the apoptosis of hippocampal cells may serve a critical role in the progression of Alzheimer's disease. In the present study, it was determined whether Simvastatin inhibited the apoptosis of hippocampal cells in vitro and in vivo ...
February 2018: Experimental and Therapeutic Medicine
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