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https://www.readbyqxmd.com/read/29222871/myelin-extracellular-leaflet-compaction-requires-apolipoprotein-d-membrane-management-to-optimize-lysosomal-dependent-recycling-and-glycocalyx-removal
#1
Nadia García-Mateo, Raquel Pascua-Maestro, Alberto Pérez-Castellanos, Concepción Lillo, Diego Sanchez, Maria D Ganfornina
To compact the extracellular sides of myelin, an important transition must take place: from membrane sliding, while building the wraps, to membrane adhesion and water exclusion. Removal of the negatively charged glycocalyx becomes the limiting factor in such transition. What is required to initiate this membrane-zipping process? Knocking-out the Lipocalin Apolipoprotein D (ApoD), essential for lysosomal functional integrity in glial cells, results in a specific defect in myelin extracellular leaflet compaction in peripheral and central nervous system, which results in reduced conduction velocity and suboptimal behavioral outputs: motor learning is compromised...
December 9, 2017: Glia
https://www.readbyqxmd.com/read/29222568/model-driven-treatment-of-childhood-apraxia-of-speech-positive-effects-of-the-speech-motor-learning-approach
#2
Anita van der Merwe, Mollie Steyn
Purpose: The aim of the study was to propose the speech motor learning approach (Van der Merwe, 2011) as a treatment for childhood apraxia of speech and to determine if it will effect positive change in the ability of a 33-month-old child to produce untreated nonwords and words containing treated age-appropriate consonants (Set 1 sounds), untreated age-appropriate consonants (Set 2), and untreated age-inappropriate consonants (Set 3) and also to determine the nature and number of segmental speech errors before and after treatment...
December 8, 2017: American Journal of Speech-language Pathology
https://www.readbyqxmd.com/read/29221774/sleep-dependent-motor-sequence-memory-consolidation-in-individuals-with-periodic-limb-movements
#3
Valya Sergeeva, Jeremy Viczko, Laura B Ray, Adrian M Owen, Stuart M Fogel
Periodic limb movements (PLMs) during sleep increase with age and are associated with striatal neurodegeneration and dopamine deficiency. Limb movements are often associated with disruptions to non-rapid eye movement (NREM) sleep. Motor skill memory consolidation recruits the striatum, and learning-dependent striatal activation is associated with NREM sleep. Therefore, we investigated whether de novo individuals who significantly experience elevated levels of PLMs but have not been formally diagnosed with periodic limb movement disorder had learning and sleep-related memory deficits and whether these deficits were related to sleep quality and symptom severity...
December 2017: Sleep Medicine
https://www.readbyqxmd.com/read/29218419/an-unexpected-improvement-in-spatial-learning-and-memory-ability-in-alpha-synuclein-a53t-transgenic-mice
#4
Qi Liu, YuYu Xu, WenPing Wan, ZeGang Ma
Growing evidence suggests, as Parkinson's disease (PD) progresses, that its non-motor symptoms appear prior to or in parallel with its motor deficits. Alpha-synuclein A53T transgenic mouse (A53T) is an essential tool to investigate the onsets and the extents of PD non-motor symptoms. Our aim is to investigate spatial learning and memory ability in A53T mice. In our rotarod tests, no motor coordination impairments were detected in mice of 3, 6, 9, and 12 months old. We then investigated their spatial learning and memory ability through Morris water maze in 3- and 9-month-old mice...
December 7, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/29216384/evaluating-smartphone-based-virtual-reality-to-improve-chinese-schoolchildren-s-pedestrian-safety-a-nonrandomized-trial
#5
David C Schwebel, Yue Wu, Peng Li, Joan Severson, Yefei He, Henry Xiang, Guoqing Hu
Objective: This nonrandomized trial evaluated whether classroom-based training in a smartphone-based virtual reality (VR) pedestrian environment (a) teaches schoolchildren to cross streets safely, and (b) increases their self-efficacy for street-crossing. Methods: Fifty-six children, aged 8-10 years, attending primary school in Changsha, China participated. Baseline pedestrian safety assessment occurred in the VR environment and through unobtrusive observation of a subsample crossing a street for 11 days outside school...
December 5, 2017: Journal of Pediatric Psychology
https://www.readbyqxmd.com/read/29214565/intellectual-disability-rare-disorders-a-diagnostic-challenge
#6
Malin Kvarnung, Ann Nordgren
Rare disorders constitute a large and heterogeneous group of diagnoses of which many cause chronic disabilities with significant impact on the lives of affected individuals and their families as well as on the health-care system. Each individual disorder is rare, but when considered as a group, rare disorders are common with a total prevalence of approximately 6-8%. The clinical presentation of these disorders includes a broad diversity of symptoms and signs, often involving the nervous system and resulting in symptoms such as intellectual disability, neuropsychiatric disorders, epilepsy and motor dysfunction...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29214390/changes-in-motor-performance-and-mental-workload-during%C3%A2-practice-of-reaching-movements-a-team-dynamics-perspective
#7
Isabelle M Shuggi, Patricia A Shewokis, Jeffrey W Herrmann, Rodolphe J Gentili
Few investigations have examined mental workload during motor practice or learning in a context of team dynamics. This study examines the underlying cognitive-motor processes of motor practice by assessing the changes in motor performance and mental workload during practice of reaching movements. Individuals moved a robotic arm to reach targets as fast and as straight as possible while satisfying the task requirement of avoiding a collision between the end-effector and the workspace limits. Individuals practiced the task either alone (HA group) or with a synthetic teammate (HRT group), which regulated the effector velocity to help satisfy the task requirements...
December 6, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29214257/piceatannol-attenuates-behavioral-disorder-and-neurological-deficits-in-aging-mice-via-activating-the-nrf2-pathway
#8
Yan Zhang, Li-Hong Zhang, Xi Chen, Ning Zhang, Guang Li
Aging is a complex process that is accompanied by neurological damage. Chronic injection of d-galactose (d-gal) can accelerate the aging process similar to natural aging and is commonly used to build an aging model to investigate aging. In the present study, the effects of piceatannol on d-gal-induced aging in mice were evaluated. Piceatannol treatment showed an observable anti-aging effect. Results obtained in vivo showed that piceatannol retained spontaneous motor activity and enhanced spatial learning and memory abilities in mice in which aging was induced by d-gal...
December 7, 2017: Food & Function
https://www.readbyqxmd.com/read/29213525/motor-learning-characterization-in-people-with-autism-spectrum-disorder-a-systematic-review
#9
Íbis Ariana Peña de Moraes, Thais Massetti, Tânia Brusque Crocetta, Talita Dias da Silva, Lilian Del Ciello de Menezes, Carlos Bandeira de Mello Monteiro, Fernando Henrique Magalhães
Autism Spectrum Disorder (ASD) is a neurodevelopmental disorder primarily characterized by deficits in social interaction, communication and implicit skill learning. OBJECTIVE: To analyse the results of research on "motor learning" and the means used for measuring "autistic disorder". METHODS: A systematic literature search was done using Medline/PubMed, Web of Science, BVS (virtual health library), and PsycINFO. We included articles that contained the keywords "autism" and "motor learning"...
July 2017: Dementia & Neuropsychologia
https://www.readbyqxmd.com/read/29213231/the-roles-of-cortical-slow-waves-in-synaptic-plasticity-and-memory-consolidation
#10
Daisuke Miyamoto, Daichi Hirai, Masanori Murayama
Sleep plays important roles in sensory and motor memory consolidation. Sleep oscillations, reflecting neural population activity, involve the reactivation of learning-related neurons and regulate synaptic strength and, thereby affect memory consolidation. Among sleep oscillations, slow waves (0.5-4 Hz) are closely associated with memory consolidation. For example, slow-wave power is regulated in an experience-dependent manner and correlates with acquired memory. Furthermore, manipulating slow waves can enhance or impair memory consolidation...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/29213051/a-robot-aided-visuo-motor-training-that-improves-proprioception-and-spatial-accuracy-of-untrained-movement
#11
Naveen Elangovan, Leonardo Cappello, Lorenzo Masia, Joshua Aman, Jürgen Konczak
Proprioceptive function can become enhanced during motor learning. Yet, we have incomplete knowledge to what extent proprioceptive function is trainable and how a training that enhances proprioception may influence performance in untrained motor skills. To address this knowledge gap, healthy young adults (N = 14) trained in a visuomotor task that required learners to make increasingly accurate wrist movements. Using a robotic exoskeleton coupled with a virtual visual environment, participants tilted a virtual table through continuous wrist flexion/extension movements with the goal to position a rolling ball on table into a target...
December 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29211651/cortico-cerebellar-networks-drive-sensorimotor-learning-in-speech
#12
Daniel R Lametti, Harriet J Smith, Phoebe Freidin, Kate E Watkins
The motor cortex and cerebellum are thought to be critical for learning and maintaining motor behaviors. Here we use transcranial direct current stimulation (tDCS) to test the role of the motor cortex and cerebellum in sensorimotor learning in speech. During productions of "head," "bed," and "dead," the first formant of the vowel sound was altered in real time toward the first formant of the vowel sound in "had," "bad," and "dad." Compensatory changes in first and second formant production were used as a measure of motor adaptation...
December 6, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/29210832/quality-of-caregiving-is-positively-associated-with-neurodevelopment-during-the-first-year-of-life-among-hiv-exposed-uninfected-children-in-uganda
#13
Itziar Familiar, Shalean M Collins, Alla Sikorskii, Horacio Ruisenor-Escudero, Barnabas Natamba, Paul Bangirana, Elizabeth M Widen, Daniel Achidri, Harriet Achola, Daniel Onen, Michael Boivin, Sera L Young
OBJECTIVE: We sought to evaluate if maternal characteristics and infant developmental milieu were predictive of early cognitive development in HIV-exposed uninfected (HEU) and un-exposed uninfected (HU) infants in Uganda. DESIGN: Longitudinal pregnancy study. METHODS: Ugandan women (n=228) were enrolled into the Postnatal Nutrition and Psychosocial Health Outcomes (PostNAPS) study with a 2:1 HIV-uninfected:infected ratio. Maternal socio-demographic, perceived social support, and depressive symptomatology were assessed...
November 27, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
https://www.readbyqxmd.com/read/29208533/assessing-cerebellar-brain-inhibition-cbi-via-transcranial-magnetic-stimulation-tms-a-systematic-review
#14
REVIEW
Lara Fernandez, Brendan P Major, Wei-Peng Teo, Linda K Byrne, Peter G Enticott
The inhibitory tone that the cerebellum exerts on the primary motor cortex (M1) is known as cerebellar brain inhibition (CBI). Studies show CBI to be relevant to several motor functions, including adaptive motor learning and muscle control. CBI can be assessed noninvasively via transcranial magnetic stimulation (TMS) using a double-coil protocol. Variability in parameter choice and controversy surrounding the protocol's ability to isolate the cerebellothalamocortical pathway casts doubt over its validity in neuroscience research...
December 2, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/29206232/behavioral-testing-of-mice-exposed-to-intermediate-frequency-magnetic-fields-indicates-mild-memory-impairment
#15
Kajal Kumari, Hennariikka Koivisto, Matti Viluksela, Kaisa M A Paldanius, Mikael Marttinen, Mikko Hiltunen, Jonne Naarala, Heikki Tanila, Jukka Juutilainen
Human exposure to intermediate frequency magnetic fields (MF) is increasing due to applications like electronic article surveillance systems and induction heating cooking hobs. However, limited data is available on their possible health effects. The present study assessed behavioral and histopathological consequences of exposing mice to 7.5 kHz MF at 12 or 120 μT for 5 weeks. No effects were observed on body weight, spontaneous activity, motor coordination, level of anxiety or aggression. In the Morris swim task, mice in the 120 μT group showed less steep learning curve than the other groups, but did not differ from controls in their search bias in the probe test...
2017: PloS One
https://www.readbyqxmd.com/read/29205794/biallelic-mutations-in-lars2-can-cause-perrault-syndrome-type-2-with-neurologic-symptoms
#16
Rika Kosaki, Reiko Horikawa, Eriko Fujii, Kenjiro Kosaki
Perrault syndrome represents a genetically heterogeneous disorder characterized by sensorineural hearing loss in males and females and ovarian dysfunction in females. Causative genes include HARS2, HSD17B4, CLPP, C10orf2, and LARS2. Some patients with Perrault syndrome exhibit neurologic features including learning disability, cerebellar ataxia, and peripheral neuropathy and are classified as type 2 and are clinically separate from those without neurological symptoms other than a hearing loss (type 1). To date, all reported patients with LARS2 mutations (15 patients in 8 families) have been classified as type 1...
December 3, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29205624/fundamental-movement-skills-and-balance-of-children-with-down-syndrome
#17
C M Capio, T C T Mak, M A Tse, R S W Masters
BACKGROUND: Conclusive evidence supports the importance of fundamental movement skills (FMS) proficiency in promoting physical activity and countering obesity. In children with Down Syndrome (DS), FMS development is delayed, which has been suggested to be associated with balance deficits. This study therefore examined the relationship between FMS proficiency and balance ability in children with DS, with the aim of contributing evidence to programmes that address FMS delay. METHODS: Participants consisted of 20 children with DS (7...
December 5, 2017: Journal of Intellectual Disability Research: JIDR
https://www.readbyqxmd.com/read/29204194/synaptogenesis-in-the-cerebellum-of-offspring-born-to-diabetic-mothers
#18
REVIEW
Javad Hami, Saeed Vafaei-Nezhad, Akram Sadeghi, Kazem Ghaemi, Mohammad-Mahdi Hasanzadeh Taheri, Mohammad Fereidouni, Ghasem Ivar, Mehran Hosseini
There is increasing evidence that maternal diabetes mellitus during the pregnancy is associated with a higher risk of neurodevelopmental and neurofunctional anomalies including motor dysfunctions, learning deficits, and behavioral problems in offspring. The cerebellum is a part of the brain that has long been recognized as a center of movement balance and motor coordination. Moreover, recent studies in humans and animals have also implicated the cerebellum in cognitive processing, sensory discrimination, attention, and learning and memory...
July 2017: Journal of Pediatric Neurosciences
https://www.readbyqxmd.com/read/29202017/molecular-motor-dnm1-synergistically-induces-membrane-curvature-to-facilitate-mitochondrial-fission
#19
Michelle W Lee, Ernest Y Lee, Ghee Hwee Lai, Nolan W Kennedy, Ammon E Posey, Wujing Xian, Andrew L Ferguson, R Blake Hill, Gerard C L Wong
Dnm1 and Fis1 are prototypical proteins that regulate yeast mitochondrial morphology by controlling fission, the dysregulation of which can result in developmental disorders and neurodegenerative diseases in humans. Loss of Dnm1 blocks the formation of fission complexes and leads to elongated mitochondria in the form of interconnected networks, while overproduction of Dnm1 results in excessive mitochondrial fragmentation. In the current model, Dnm1 is essentially a GTP hydrolysis-driven molecular motor that self-assembles into ring-like oligomeric structures that encircle and pinch the outer mitochondrial membrane at sites of fission...
November 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/29200995/ssri-and-motor-recovery-in-stroke-reestablishment-of-inhibitory-neural-network-tonus
#20
Camila B Pinto, Faddi G Saleh Velez, Fernanda Lopes, Polyana V de Toledo Piza, Laura Dipietro, Qing M Wang, Nicole L Mazwi, Erica C Camargo, Randie Black-Schaffer, Felipe Fregni
Selective serotonin reuptake inhibitors (SSRIs) are currently widely used in the field of the neuromodulation not only because of their anti-depressive effects but also due to their ability to promote plasticity and enhance motor recovery in patients with stroke. Recent studies showed that fluoxetine promotes motor recovery after stroke through its effects on the serotonergic system enhancing motor outputs and facilitating long term potentiation, key factors in motor neural plasticity. However, little is known in regards of the exact mechanisms underlying these effects and several aspects of it remain poorly understood...
2017: Frontiers in Neuroscience
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