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https://www.readbyqxmd.com/read/28549064/chemomechanical-regulation-of-myosin-ic-cross-bridges-deducing-the-elastic-properties-of-an-ensemble-from-single-molecule-mechanisms
#1
Florian Berger, A J Hudspeth
Myosin Ic is thought to be the principal constituent of the motor that adjusts mechanical responsiveness during adaptation to prolonged stimuli by hair cells, the sensory receptors of the inner ear. In this context myosin molecules operate neither as filaments, as occurs in muscles, nor as single or few molecules, as characterizes intracellular transport. Instead, myosin Ic molecules occur in a complex cluster in which they may exhibit cooperative properties. To better understand the motor's remarkable function, we introduce a theoretical description of myosin Ic's chemomechanical cycle based on experimental data from recent single-molecule studies...
May 26, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28547793/the-anatomy-and-physiology-of-normal-and-abnormal-swallowing-in-oropharyngeal-dysphagia
#2
REVIEW
A Sasegbon, S Hamdy
BACKGROUND: Eating and drinking are enjoyable activities that positively impact on an individual's quality of life. The ability to swallow food and fluid is integral to the process of eating. Swallowing occupies a dual role being both part of the enjoyment of eating and being a critically important utilitarian activity to enable adequate nutrition and hydration. Any impairment to the process of swallowing can negatively affect a person's perception of their quality of life. The process of swallowing is highly complex and involves muscles in the mouth, pharynx, larynx, and esophagus...
May 25, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28545994/the-impact-of-atypical-sensory-processing-on-social-impairments-in-autism-spectrum-disorder
#3
REVIEW
Melissa D Thye, Haley M Bednarz, Abbey J Herringshaw, Emma B Sartin, Rajesh K Kana
Altered sensory processing has been an important feature of the clinical descriptions of autism spectrum disorder (ASD). There is evidence that sensory dysregulation arises early in the progression of ASD and impacts social functioning. This paper reviews behavioral and neurobiological evidence that describes how sensory deficits across multiple modalities (vision, hearing, touch, olfaction, gustation, and multisensory integration) could impact social functions in ASD. Theoretical models of ASD and their implications for the relationship between sensory and social functioning are discussed...
May 17, 2017: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/28544952/influence-of-both-cutaneous-input-from-the-foot-soles-and-visual-information-on-the-control-of-postural-stability-in-dyslexic-children
#4
Nathalie Goulème, Philippe Villeneuve, Christophe-Loïc Gérard, Maria Pia Bucci
Dyslexic children show impaired in postural stability. The aim of our study was to test the influence of foot soles and visual information on the postural control of dyslexic children, compared to non-dyslexic children. Postural stability was evaluated with TechnoConcept(®) platform in twenty-four dyslexic children (mean age: 9.3±0.29years) and in twenty-four non-dyslexic children, gender- and age-matched, in two postural conditions (with and without foam: a 4-mm foam was put under their feet or not) and in two visual conditions (eyes open and eyes closed)...
May 4, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28543739/sound-at-the-zoo-using-animal-monitoring-sound-measurement-and-noise-reduction-in-zoo-animal-management
#5
David A Orban, Joseph Soltis, Lori Perkins, Jill D Mellen
A clear need for evidence-based animal management in zoos and aquariums has been expressed by industry leaders. Here, we show how individual animal welfare monitoring can be combined with measurement of environmental conditions to inform science-based animal management decisions. Over the last several years, Disney's Animal Kingdom® has been undergoing significant construction and exhibit renovation, warranting institution-wide animal welfare monitoring. Animal care and science staff developed a model that tracked animal keepers' daily assessments of an animal's physical health, behavior, and responses to husbandry activity; these data were matched to different external stimuli and environmental conditions, including sound levels...
May 23, 2017: Zoo Biology
https://www.readbyqxmd.com/read/28539879/multiple-neural-networks-malfunction-in-primary-blepharospasm-an-independent-components-analysis
#6
Xiao-Feng Huang, Meng-Ru Zhu, Ping Shan, Chen-Hui Pei, Zhan-Hua Liang, Hui-Ling Zhou, Ming-Fei Ni, Yan-Wei Miao, Guo-Qing Xu, Bing-Wei Zhang, Ya-Yin Luo
Primary blepharospasm (BPS) is a focal dystonia characterized by involuntary blinking and eyelid spasms. The pathophysiology of BPS remains unclear. Several neuroimaging studies have suggested dysfunction of sensory processing and sensorimotor integration, but the results have been inconsistent. This study aimed to determine whether patients with BPS exhibit altered functional brain connectivity and to explore possible correlations between these networks and clinical variables. Twenty-five patients with BPS and 25 healthy controls were enrolled...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28536959/multisensory-integration-of-low-level-information-in-autism-spectrum-disorder-measuring-susceptibility-to-the-flash-beep-illusion
#7
Vanessa A Bao, Victoria Doobay, Laurent Mottron, Olivier Collignon, Armando Bertone
Previous studies have suggested audiovisual multisensory integration (MSI) may be atypical in Autism Spectrum Disorder (ASD). However, much of the research having found an alteration in MSI in ASD involved socio-communicative stimuli. The goal of the current study was to investigate MSI abilities in ASD using lower-level stimuli that are not socio-communicative in nature by testing susceptibility to auditory-guided visual illusions. Adolescents and adults with ASD and typically-developing (TD) individuals were shown to have similar susceptibility to a fission illusion...
May 23, 2017: Journal of Autism and Developmental Disorders
https://www.readbyqxmd.com/read/28536546/only-three-fingers-write-but-the-whole-brain-works-a-high-density-eeg-study-showing-advantages-of-drawing-over-typing-for-learning
#8
Audrey L H van der Meer, F R Ruud van der Weel
Are different parts of the brain active when we type on a keyboard as opposed to when we draw visual images on a tablet? Electroencephalogram (EEG) was used in young adults to study brain electrical activity as they were typing or describing in words visually presented Pictionary(TM) words using a keyboard, or as they were drawing pictures of the same words on a tablet using a stylus. Analyses of temporal spectral evolution (time-dependent amplitude changes) were performed on EEG data recorded with a 256-channel sensor array...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28536517/differential-recruitment-of-parietal-cortex-during-spatial-and-non-spatial-reach-planning
#9
Pierre-Michel Bernier, Kevin Whittingstall, Scott T Grafton
The planning of goal-directed arm reaching movements is associated with activity in the dorsal parieto-frontal cortex, within which multiple regions subserve the integration of arm- and target-related sensory signals to encode a motor goal. Surprisingly, many of these regions show sustained activity during reach preparation even when target location is not specified, i.e., when a motor goal cannot be unambiguously formed. The functional role of these non-spatial preparatory signals remains unresolved. Here this process was investigated in humans by comparing reach preparatory activity in the presence or absence of information regarding upcoming target location...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28535807/identification-of-putative-olfactory-g-protein-coupled-receptors-in-crown-of-thorns-starfish-acanthaster-planci
#10
Rebecca E Roberts, Cherie A Motti, Kenneth W Baughman, Noriyuki Satoh, Michael R Hall, Scott F Cummins
BACKGROUND: In marine organisms, and in particular for benthic invertebrates including echinoderms, olfaction is a dominant sense with chemosensation being a critical signalling process. Until recently natural product chemistry was the primary investigative approach to elucidate the nature of chemical signals but advances in genomics and transcriptomics over the last decade have facilitated breakthroughs in understanding not only the chemistry but also the molecular mechanisms underpinning chemosensation in aquatic environments...
May 23, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28534068/trust-in-haptic-assistance-weighting-visual-and-haptic-cues-based-on-error-history
#11
Tricia L Gibo, Winfred Mugge, David A Abbink
To effectively interpret and interact with the world, humans weight redundant estimates from different sensory cues to form one coherent, integrated estimate. Recent advancements in physical assistance systems, where guiding forces are computed by an intelligent agent, enable the presentation of augmented cues. It is unknown, however, if cue weighting can be extended to augmented cues. Previous research has shown that cue weighting is determined by the reliability (inversely related to uncertainty) of cues within a trial, yet augmented cues may also be affected by errors that vary over trials...
May 22, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28533456/colour-vision-and-coevolution-in-avian-brood-parasitism
#12
REVIEW
Mary Caswell Stoddard, Mark E Hauber
The coevolutionary interactions between avian brood parasites and their hosts provide a powerful system for investigating the diversity of animal coloration. Specifically, reciprocal selection pressure applied by hosts and brood parasites can give rise to novel forms and functions of animal coloration, which largely differ from those that arise when selection is imposed by predators or mates. In the study of animal colours, avian brood parasite-host dynamics therefore invite special consideration. Rapid advances across disciplines have paved the way for an integrative study of colour and vision in brood parasite-host systems...
July 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28532184/a-review-of-invasive-and-non-invasive-sensory-feedback-in-upper-limb-prostheses
#13
Pamela Svensson, Ulrika Wijk, Anders Björkman, Christian Antfolk
The constant challenge to restore sensory feedback in prosthetic hands has provided several research solutions, but virtually none has reached clinical fruition. A prosthetic hand with sensory feedback that closely imitates an intact hand and provides a natural feeling may induce the prosthetic hand to be included in the body image and also reinforces the control of the prosthesis. Areas covered: This review presents non-invasive sensory feedback systems such as mechanotactile, vibrotactile, electrotactile and combinational systems which combine the modalities; multi-haptic feedback...
May 22, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28530663/a-cerebellum-like-circuit-in-the-auditory-system-cancels-responses-to-self-generated-sounds
#14
Shobhit Singla, Conor Dempsey, Richard Warren, Armen G Enikolopov, Nathaniel B Sawtell
The dorsal cochlear nucleus (DCN) integrates auditory nerve input with a diverse array of sensory and motor signals processed in circuitry similar to that of the cerebellum. Yet how the DCN contributes to early auditory processing has been a longstanding puzzle. Using electrophysiological recordings in mice during licking behavior, we show that DCN neurons are largely unaffected by self-generated sounds while remaining sensitive to external acoustic stimuli. Recordings in deafened mice, together with neural activity manipulations, indicate that self-generated sounds are cancelled by non-auditory signals conveyed by mossy fibers...
May 22, 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28528666/role-of-nonneuronal-trpv4-signaling-in-inflammatory-processes
#15
Pradeep Rajasekhar, Daniel P Poole, Nicholas A Veldhuis
Transient receptor potential (TRP) ion channels are important signaling components in nociceptive and inflammatory pathways. This is attributed to their ability to function as polymodal sensors of environmental stimuli (chemical and mechanical) and as effector molecules in receptor signaling pathways. TRP vanilloid 4 (TRPV4) is a nonselective cation channel that is activated by multiple endogenous stimuli including shear stress, membrane stretch, and arachidonic acid metabolites. TRPV4 contributes to many important physiological processes and dysregulation of its activity is associated with chronic conditions of metabolism, inflammation, peripheral neuropathies, musculoskeletal development, and cardiovascular regulation...
2017: Advances in Pharmacology
https://www.readbyqxmd.com/read/28528380/the-rat-corticospinal-system-is-functionally-and-anatomically-segregated
#16
Rafael Olivares-Moreno, Yunuen Moreno-Lopez, Luis Concha, Guadalupe Martínez-Lorenzana, Miguel Condés-Lara, Matilde Cordero-Erausquin, Gerardo Rojas-Piloni
The descending corticospinal (CS) projection has been considered a key element for motor control, which results from direct and indirect modulation of spinal cord pre-motor interneurons in the intermediate gray matter of the spinal cord, which, in turn, influences motoneurons in the ventral horn. The CS tract (CST) is also involved in a selective and complex modulation of sensory information in the dorsal horn. However, little is known about the spinal network engaged by the CST and the organization of CS projections that may encode different cortical outputs to the spinal cord...
May 20, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28528227/treatment-non-response-associations-with-smoking-expectancies-among-treatment-seeking-smokers
#17
Lorra Garey, Samar A Taha, Brooke Y Kauffman, Kara F Manning, Clayton Neighbors, Norman B Schmidt, Michael J Zvolensky
Despite the high rate of smoking cessation treatment non-response, relatively little empirical work has examined predictors of treatment non-response. The present study sought to explore the effect of smoking outcome expectancies on treatment response in a sample of treatment-seeking adult daily smokers (N=182; 53.3% female; Mage=40.67; SD=13.63). Results indicated that expectancies for smoking to reduce negative affect were related to an increased likelihood of treatment non-response (OR=0.73, CI: 0.54, 0...
May 9, 2017: Addictive Behaviors
https://www.readbyqxmd.com/read/28527790/visual-cortex-signals-a-mismatch-between-regularity-of-auditory-and-visual-streams
#18
Michael Andric, Ben Davis, Uri Hasson
Understanding how humans code for and respond to environmental uncertainty/regularity is a question shared by current computational and neurobiological approaches to human cognition. To date, studies investigating neurobiological systems that track input uncertainty have examined responses to uni-sensory streams. It is not known, however, whether there exist brain systems that combine information about the regularity of input streams presented to different senses. We report an fMRI study that aimed to identify brain systems that relate statistical information across sensory modalities...
May 17, 2017: NeuroImage
https://www.readbyqxmd.com/read/28527111/human-placenta-derived-mesenchymal-stem-cells-loaded-on-linear-ordered-collagen-scaffold-improves-functional-recovery-after-completely-transected-spinal-cord-injury-in-canine
#19
Sufang Han, Zhifeng Xiao, Xing Li, Huan Zhao, Bin Wang, Zhixue Qiu, Zhi Li, Xin Mei, Bai Xu, Caixia Fan, Bing Chen, Jin Han, Yanzheng Gu, Huilin Yang, Qin Shi, Jianwu Dai
Traumatic spinal cord injury (SCI) is a major challenge in the clinic. In this study, we sought to examine the synergistic effects of linear ordered collagen scaffold (LOCS) and human placenta-derived mesenchymal stem cells (hPMSCs) when transplanted into completely transected beagle dogs. After 36 weeks observation, we found that LOCS+hPMSCs implants promoted better hindlimb locomotor recovery than was observed in the non-treatment (control) group and LOCS group. Histological analysis showed that the regenerated tissue after treatment was well integrated with the host tissue, and dramatically reduced the volume of cystic and chondroitin sulfate proteoglycans (CSPGs) expression...
May 16, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/28525601/too-fast-or-too-slow-time-and-neuronal-variability-in-bipolar-disorder-a-combined-theoretical-and-empirical-investigation
#20
Georg Northoff, Paola Magioncalda, Matteo Martino, Hsin-Chien Lee, Ying-Chi Tseng, Timothy Lane
Time is an essential feature in bipolar disorder (BP). Manic and depressed BP patients perceive the speed of time as either too fast or too slow. The present article combines theoretical and empirical approaches to integrate phenomenological, psychological, and neuroscientific accounts of abnormal time perception in BP. Phenomenology distinguishes between perception of inner time, ie, self-time, and outer time, ie, world-time, that desynchronize or dissociate from each other in BP: inner time speed is abnormally slow (as in depression) or fast (as in mania) and, by taking on the role as default-mode function, impacts and modulates the perception of outer time speed in an opposite way, ie, as too fast in depression and too slow in mania...
May 19, 2017: Schizophrenia Bulletin
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