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https://www.readbyqxmd.com/read/28091814/effects-of-forced-movements-on-learning-findings-from-a-choice-reaction-time-task-in-rats
#1
Hidekazu Kaneko, Hiroto Sano, Yasuhisa Hasegawa, Hiroshi Tamura, Shinya S Suzuki
To investigate how motor sensation facilitates learning, we used a sensory-motor association task to determine whether the sensation induced by forced movements contributes to performance improvements in rats. The rats were trained to respond to a tactile stimulus (an air puff) by releasing a lever pressed by the stimulated (compatible condition) or nonstimulated (incompatible condition) forepaw. When error rates fell below 15%, the compatibility condition was changed (reversal learning). An error trial was followed by a lever activation trial in which a lever on the correct or the incorrect response side was automatically elevated at a preset time of 120, 220, 320, or 420 ms after tactile stimulation...
January 14, 2017: Learning & Behavior
https://www.readbyqxmd.com/read/28091708/the-effect-of-motor-overflow-on-bimanual-asymmetric-force-coordination
#2
David A Cunningham, Sarah M Roelle, Didier Allexandre, Kelsey A Potter-Baker, Vishwanath Sankarasubramanian, Jayme S Knutson, Guang H Yue, Andre G Machado, Ela B Plow
Motor overflow, typically described in the context of unimanual movements, refers to the natural tendency for a 'resting' limb to move during movement of the opposite limb and is thought to be influenced by inter-hemispheric interactions and intra-cortical networks within the 'resting' hemisphere. It is currently unknown, however, how motor overflow contributes to asymmetric force coordination task accuracy, referred to as bimanual interference, as there is need to generate unequal forces and corticospinal output for each limb...
January 16, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28088930/adherence-of-older-people-with-instability-in-vestibular-rehabilitation-programmes-prediction-criteria
#3
A Soto-Varela, A Faraldo-García, M Del-Río-Valeiras, M Rossi-Izquierdo, I Vaamonde-Sánchez-Andrade, P Gayoso-Diz, A Lirola-Delgado, S Santos-Pérez
OBJECTIVE: To determine whether demographic characteristics or balance examination findings can predict the adherence of older people with instability to a vestibular rehabilitation programme. METHODS: A prospective case-control study was conducted of 120 patients aged 65 years or more (mean age, 77.3 ± 6.33 years). Two groups were classified according to patients' adherence with the follow-up post-rehabilitation protocol. Analysed variables included: age, sex, body mass index, Timed Up and Go test findings, computerised dynamic posturography, Dizziness Handicap Inventory scores and Short Falls Efficacy Scale - International questionnaire results, number of falls, and type of vestibular rehabilitation...
January 16, 2017: Journal of Laryngology and Otology
https://www.readbyqxmd.com/read/28078072/multisensor-classification-system-for-triggering-fes-in-order-to-support-voluntary-swallowing
#4
Benjamin Riebold, Holger Nahrstaedt, Corinna Schultheiss, Rainer O Seidl, Thomas Schauer
In dysphagia the ability of elevating the larynx and hyoid is usually impaired. Electromyography (EMG) and Bioimpedance (BI) measurements at the neck can be used to trigger functional electrical stimulation (FES) of swallowing related muscles. Nahrstaedt et al.(1) introduced an algorithm to trigger the stimulation in phase with the voluntary swallowing to improve the airway closure and elevation speed of the larynx and hyoid. However, due to non-swallow related movements like speaking, chewing or head turning, stimulations might be unintentionally triggered...
September 15, 2016: European Journal of Translational Myology
https://www.readbyqxmd.com/read/28072384/impact-of-cerebellar-atrophy-on-cortical-gray-matter-and-cerebellar-peduncles-as-assessed-by-voxel-based-morphometry-and-high-angular-resolution-diffusion-imaging
#5
Michael Dayan, G Olivito, M Molinari, Mara Cercignani, Marco Bozzali, M Leggio
In recent years the cerebellum has been attributed amore important role in higher-level functions than previously believed. We examined a cohort of patients suffering from cerebellar atrophy resulting in ataxia, with two main objectives: first to investigate which regions of the cerebrum were affected by the cerebellar degeneration, and second to assess whether diffusion magnetic resonance imaging (dMRI) metrics within the medial (MCP) and superior cerebellar peduncle (SCP) - namely fractional anisotropy (FA) and radial diffusivity (RD) - could be used as a biomarker in patients with this condition...
October 2016: Functional Neurology
https://www.readbyqxmd.com/read/28070599/organophosphate-neurotoxicity-to-the-voluntary-motor-system-on-the-trail-of-environment-caused-amyotrophic-lateral-sclerosis-the-known-the-misknown-and-the-unknown
#6
Samantha J Merwin, Teresa Obis, Yanelli Nunez, Diane B Re
Amyotrophic lateral sclerosis (ALS) is the most common adult-onset paralytic disorder. It is characterized by progressive degeneration of the motor neurons controlling voluntary movement. The underlying mechanisms remain elusive, a fact that has precluded development of effective treatments. ALS presents as a sporadic condition 90-95% of the time, i.e., without familial history or obvious genetic mutation. This suggests that ALS has a strong environmental component. Organophosphates (OPs) are prime candidate neurotoxicants in the etiology of ALS, as exposure to OPs was linked to higher ALS incidence among farmers, soccer players, and Gulf War veterans...
January 9, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28069951/calsequestrin-depolymerizes-when-calcium-is-depleted-in-the-sarcoplasmic-reticulum-of-working-muscle
#7
Carlo Manno, Lourdes C Figueroa, Dirk Gillespie, Robert Fitts, ChulHee Kang, Clara Franzini-Armstrong, Eduardo Rios
Calsequestrin, the only known protein with cyclical storage and supply of calcium as main role, is proposed to have other functions, which remain unproven. Voluntary movement and the heart beat require this calcium flow to be massive and fast. How does calsequestrin do it? To bind large amounts of calcium in vitro, calsequestrin must polymerize and then depolymerize to release it. Does this rule apply inside the sarcoplasmic reticulum (SR) of a working cell? We answered using fluorescently tagged calsequestrin expressed in muscles of mice...
January 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28055084/forward-head-posture-and-activation-of-rectus-capitis-posterior-muscles
#8
Richard C Hallgren, Steven J Pierce, Dhruv B Sharma, Jacob J Rowan
CONTEXT: Rectus capitis posterior (RCP) muscles have physical attachments to the pain-sensitive spinal dura. Atrophy of these muscles is associated with chronic headache in some patients. The authors suspect that the significance of atrophy in the RCP muscles has been undervalued because the functional role of these muscles is not well defined. OBJECTIVE: To determine whether a statistically significant change in normalized levels of electromyographic activity in RCP muscles occurs when the head is voluntarily moved from a self-selected neutral head position to a protruded head position...
January 1, 2017: Journal of the American Osteopathic Association
https://www.readbyqxmd.com/read/28054143/a-low-cost-mr-compatible-ergometer-to-assess-post-exercise-phosphocreatine-recovery-kinetics
#9
Niels D Naimon, Jerzy Walczyk, James S Babb, Oleksandr Khegai, Xuejiao Che, Leeor Alon, Ravinder R Regatte, Ryan Brown, Prodromos Parasoglou
OBJECTIVE: To develop a low-cost pedal ergometer compatible with ultrahigh (7 T) field MR systems to reliably quantify metabolic parameters in human lower leg muscle using phosphorus magnetic resonance spectroscopy. MATERIALS AND METHODS: We constructed an MR compatible ergometer using commercially available materials and elastic bands that provide resistance to movement. We recruited ten healthy subjects (eight men and two women, mean age ± standard deviation: 32...
January 4, 2017: Magma
https://www.readbyqxmd.com/read/28053031/muscle-fibers-secrete-fgfbp1-to-slow-degeneration-of-neuromuscular-synapses-during-aging-and-progression-of-als
#10
Thomas Taetzsch, Milagros J Tenga, Gregorio Valdez
: The identity of muscle secreted factors critical for the development and maintenance of neuromuscular junctions (NMJs) remains largely unknown. Here, we show that muscle fibers secrete and concentrate the fibroblast growth factor binding protein 1 (FGFBP1) at NMJs. Although FGFBP1 expression increases during development, its expression decreases before NMJ degeneration during aging and in SOD1(G93A) mice, a mouse model for amyotrophic lateral sclerosis (ALS). Based on these findings, we examined the impact of deleting FGFBP1 on NMJs...
January 4, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28051341/effects-of-compression-garment-pressure-on-recovery-from-strenuous-exercise
#11
Jessica Hill, Glyn Howatson, Ken van Someren, David Gaze, Hayley Legg, Jack Lineham, Charles Pedlar
Compression garments are frequently used to facilitate recovery from strenuous exercise. Purpose To identify the effects of two different grades of compression garment on recovery indices following strenuous exercise. Methods Forty five recreationally active participants (n=26 males and n=19 females) completed an eccentric exercise protocol consisting of 100 drop jumps. Following the exercise protocol participants were matched for body mass and randomly but equally assigned to either a high (HI) compression pressure group, a low (LOW) compression pressure group, or a sham ultrasound group (SHAM)...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28040606/steinert-syndrome-and-repercussions-in-dental-medicine
#12
REVIEW
Helena Baptista, Inês Lopes Cardoso
Steinert syndrome, also called myotonic dystrophy type 1, is a genetic disorder with autosomal dominant transmission characterized by myotonia and a multisystemic clinical picture that affects several tissues of the human body. The most common systemic phenotypes are: muscular, cardiac, respiratory, CNS, ocular, gynecological, digestive, orthopedical, as well as cognitive and psychological symptoms (cognitive decline). Muscles involved in voluntary movement are highly affected by myotonia especially distal muscles of upper limbs...
December 23, 2016: Archives of Oral Biology
https://www.readbyqxmd.com/read/28033433/covert-spatial-attention-is-functionally-intact-in-amblyopic-human-adults
#13
Mariel Roberts, Rachel Cymerman, R Theodore Smith, Lynne Kiorpes, Marisa Carrasco
Certain abnormalities in behavioral performance and neural signaling have been attributed to a deficit of visual attention in amblyopia, a neurodevelopmental disorder characterized by a diverse array of visual deficits following abnormal binocular childhood experience. Critically, most have inferred attention's role in their task without explicitly manipulating and measuring its effects against a baseline condition. Here, we directly investigate whether human amblyopic adults benefit from covert spatial attention-the selective processing of visual information in the absence of eye movements-to the same degree as neurotypical observers...
December 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/28018266/inhibitory-control-processes-and-the-strategies-that-support-them-during-hand-and-eye-movements
#14
Lauren M Schmitt, Lisa D Ankeny, John A Sweeney, Matthew W Mosconi
Background and Aims: Adaptive behavior depends on the ability to voluntarily suppress context-inappropriate behaviors, a process referred to as response inhibition. Stop Signal tests (SSTs) are the most frequently studied paradigm used to assess response inhibition. Previous studies of SSTs have indicated that inhibitory control behavior can be explained using a common model in which GO and STOP processes are initiated independent from one and another, and the process that is completed first determines whether the behavior is elicited (GO process) or terminated (STOP process)...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/28018189/auditory-somatosensory-temporal-sensitivity-improves-when-the-somatosensory-event-is-caused-by-voluntary-body-movement
#15
Norimichi Kitagawa, Masaharu Kato, Makio Kashino
When we actively interact with the environment, it is crucial that we perceive a precise temporal relationship between our own actions and sensory effects to guide our body movements. Thus, we hypothesized that voluntary movements improve perceptual sensitivity to the temporal disparity between auditory and movement-related somatosensory events compared to when they are delivered passively to sensory receptors. In the voluntary condition, participants voluntarily tapped a button, and a noise burst was presented at various onset asynchronies relative to the button press...
2016: Frontiers in Integrative Neuroscience
https://www.readbyqxmd.com/read/28009277/movement-initiation-signals-in-mouse-whisker-motor-cortex
#16
Varun Sreenivasan, Vahid Esmaeili, Taro Kiritani, Katia Galan, Sylvain Crochet, Carl C H Petersen
Frontal cortex plays a central role in the control of voluntary movements, which are typically guided by sensory input. Here, we investigate the function of mouse whisker primary motor cortex (wM1), a frontal region defined by dense innervation from whisker primary somatosensory cortex (wS1). Optogenetic stimulation of wM1 evokes rhythmic whisker protraction (whisking), whereas optogenetic inactivation of wM1 suppresses initiation of whisking. Whole-cell membrane potential recordings and silicon probe recordings of action potentials reveal layer-specific neuronal activity in wM1 at movement initiation, and encoding of fast and slow parameters of movements during whisking...
December 21, 2016: Neuron
https://www.readbyqxmd.com/read/28003416/fractionation-of-muscle-activity-in-rapid-responses-to-startling-cues
#17
Lauren R Dean, Stuart N Baker
Movements in response to acoustically startling cues have shorter reaction times than those following less intense sounds; this is known as the StartReact effect. The neural underpinnings for StartReact are unclear. One possibility is that startling cues preferentially invoke the reticulospinal tract to convey motor commands to spinal motoneurons. Reticulospinal outputs are highly divergent, controlling large groups of muscles in synergistic patterns. By contrast the dominant pathway in primate voluntary movement is the corticospinal tract, which can access small groups of muscles selectively...
December 21, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28000197/-efficacy-evaluation-of-laparoscopic-surgery-for-children-with-persistent-cloaca
#18
Chen Wang, Shuli Liu, Zhen Chen, Long Li, Wei Zheng
OBJECTIVE: To explore the feasibility and efficacy of laparoscopic surgery in the treatment of children with persistent cloaca. METHODS: Clinical data of 26 female children with high type persistent cloaca undergoing operation in the Capital Pediatric Institution between November 2005 and February 2015 were retrospectively analyzed. Mean age of these children was (1.4±1.6) years old. Distal end of rectum locating in the superior border of pubis was the standard of diagnosis...
December 25, 2016: Zhonghua Wei Chang Wai Ke za Zhi, Chinese Journal of Gastrointestinal Surgery
https://www.readbyqxmd.com/read/27999892/electromyographic-assessment-of-paratonia
#19
Lucio Marinelli, Laura Mori, Matteo Pardini, David Beversdorf, Leonardo Cocito, Antonio Currà, Francesco Fattapposta, Maria Felice Ghilardi, Giovanni Abbruzzese, Carlo Trompetto
Many years after its initial description, paratonia remains a poorly understood concept. It is described as the inability to relax muscles during muscle tone assessment with the subject involuntary facilitating or opposing the examiner. Although related to cognitive impairment and frontal lobe function, the underlying mechanisms have not been clarified. Moreover, criteria to distinguish oppositional paratonia from parkinsonian rigidity or spasticity are not yet available. Paratonia is very frequently encountered in clinical practice and only semi-quantitative rating scales are available...
December 20, 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/27997984/the-relationship-between-lip-closing-force-and-dental-arch-morphology-in-patient-with-angle-class-i-malocclusion
#20
Yoshie Takehana, Yuji Masuda, Toru Kageyama, Rurika Okazaki, Madoka Murakami, Kazuhiro Yamada
Dental arch morphology and tooth position are affected by lip-closing force (LCF). This study aimed to quantitatively evaluate the relationships between the horizontal or vertical balance of the LCF generated during maximum voluntary pursing-like movements and dental arch length (DAL) or width (DAW) or the lingual inclination of the upper or lower 1st molars (LIUM, LILM) in patients with Angle Class I malocclusion. Sixteen subjects with Angle Class I malocclusion (median age: 23.4±5.9 years) who had never undergone orthodontic treatment were randomly selected...
December 20, 2016: Journal of Oral Rehabilitation
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