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https://www.readbyqxmd.com/read/29021744/posterior-thalamic-nucleus-modulation-of-tactile-stimuli-processing-in-rat-motor-and-primary-somatosensory-cortices
#1
Diana Casas-Torremocha, Francisco Clascá, Ángel Núñez
Rodents move rhythmically their facial whiskers and compute differences between signals predicted and those resulting from the movement to infer information about objects near their head. These computations are carried out by a large network of forebrain structures that includes the thalamus and the primary somatosensory (S1BF) and motor (M1wk) cortices. Spatially and temporally precise mechanorreceptive whisker information reaches the S1BF cortex via the ventroposterior medial thalamic nucleus (VPM). Other whisker-related information may reach both M1wk and S1BF via the axons from the posterior thalamic nucleus (Po)...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/29020746/proteomic-landscape-of-the-primary-somatosensory-cortex-upon-sensory-deprivation
#2
Koen Kole, Rik G H Lindeboom, Marijke P A Baltissen, Pascal W T C Jansen, Michiel Vermeulen, Paul Tiesinga, Tansu Celikel
Experience-dependent plasticity (EDP) powerfully shapes neural circuits by inducing long-lasting molecular changes in the brain. Molecular mechanisms of EDP have been traditionally studied by identifying single or small subsets of targets along the biochemical pathways that link synaptic receptors to nuclear processes. Recent technological advances in large-scale analysis of gene transcription and translation now allow systematic observation of thousands of molecules simultaneously. Here we employed label-free quantitative mass spectrometry to address experience-dependent changes in the proteome after sensory deprivation of the primary somatosensory cortex...
October 1, 2017: GigaScience
https://www.readbyqxmd.com/read/29020745/transcriptional-mapping-of-the-primary-somatosensory-cortex-upon-sensory-deprivation
#3
Koen Kole, Yutaro Komuro, Jan Provaznik, Jelena Pistolic, Vladimir Benes, Paul Tiesinga, Tansu Celikel
Experience-dependent plasticity (EDP) is essential for anatomical and functional maturation of sensory circuits during development. Although the principal synaptic and circuit mechanisms of EDP are increasingly well studied experimentally and computationally, its molecular mechanisms remain largely elusive. EDP can be readily studied in the rodent barrel cortex, where each "barrel column" preferentially represents deflections of its own principal whisker. Depriving select whiskers while sparing their neighbours introduces competition between barrel columns, ultimately leading to weakening of intracortical, translaminar (i...
October 1, 2017: GigaScience
https://www.readbyqxmd.com/read/28981591/anatomical-correlates-of-local-translaminar-and-transcolumnar-inhibition-by-layer-6-gabaergic-interneurons-in-somatosensory-cortex
#4
Marlene Arzt, Bert Sakmann, Hanno S Meyer
In the vibrissal area of rodent somatosensory cortex, information on whisker stimulation is processed by neuronal networks in a corresponding cortical column. To understand how sensory stimuli are represented in a column, it is essential to identify cell types constituting these networks. Layer 6 (L6) comprises 25% of all neurons in a column. In rats, 430 of these are inhibitory interneurons (INs). Little is known about the axon projection of L6 INs with reference to columnar and laminar organization. We quantified axonal projections of L6 INs (n = 68) with reference to columns and layers in somatosensory cortex of rats...
July 18, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28971533/growth-rate-and-stable-carbon-and-nitrogen-isotope-trophic-discrimination-factors-of-lion-and-leopard-whiskers
#5
Ruwimbo Mutirwara, Frans G T Radloff, Daryl Codron
RATIONALE: Stable isotope analysis (SIA) of whiskers has been used to identify temporal feeding habits, intra-population diet variation, as well as individual dietary specialisation of marine and terrestrial carnivores. However, the potential of the method to disclose such dietary information for large wild felids is hampered by lack of information on species-specific whisker growth rates, whisker growth patterns and whisker-diet trophic discrimination factors (TDFs). METHODS: Whisker growth rates and growth patterns were measured for four lions Panthera leo and one leopard Panthera pardus held at the National Zoological Gardens, Pretoria, South Africa...
October 3, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28958919/3d-reconstruction-and-standardization-of-the-rat-facial-nucleus-for-precise-mapping-of-vibrissal-motor-networks
#6
Jason M Guest, Mythreya M Seetharama, Elizabeth S Wendel, Peter L Strick, Marcel Oberlaender
The rodent facial nucleus (FN) comprises motoneurons (MNs) that control the facial musculature. In the lateral part of the FN, populations of vibrissal motoneurons (vMNs) innervate two groups of muscles that generate movements of the whiskers. Vibrissal MNs thus represent the terminal point of the neuronal networks that generate rhythmic whisking during exploratory behaviors and that modify whisker movements based on sensory-motor feedback during tactile-based perception. Here, we combined retrograde tracer injections into whisker-specific muscles, with large-scale immunohistochemistry and digital reconstructions to generate an average model of the rat FN...
September 27, 2017: Neuroscience
https://www.readbyqxmd.com/read/28942129/bone-regeneration-with-micro-nano-hybrid-structured-biphasic-calcium-phosphate-bioceramics-at-segmental-bone-defect-and-the-induced-immunoregulation-of-mscs
#7
Yu Zhu, Kun Zhang, Rui Zhao, Xingjiang Ye, Xuening Chen, Zhanwen Xiao, Xiao Yang, Xiangdong Zhu, Kai Zhang, Yujiang Fan, Xingdong Zhang
Adequate bone regeneration has been difficult to achieve at segmental bone defects caused by disease. The surface structure and phase composition of calcium phosphate bioceramic are crucial for its bioactivity and osteoinductivity. In the present study, biphasic calcium phosphate (BCP) bioceramics composed of micro-whiskers and nanoparticles hybrid-structured surface (hBCP) were fabricated via a hydrothermal reaction. The in vivo long bone defect model of beagle dogs implanted with hBCP bioceramics achieved a higher quality regenerated bone as compared to the traditional smooth-surface BCP control group...
September 18, 2017: Biomaterials
https://www.readbyqxmd.com/read/28941060/capillarity-composited-recycled-paper-graphene-scaffold-for-lithium-sulfur-batteries-with-enhanced-capacity-and-extended-lifespan
#8
Yunya Zhang, Zan Gao, Xiaodong Li
An effective strategy to tackle the twin crises of global deforestation and fossil fuel depletion is to recycle biomass materials for energy storage devices. This study reports a unique and innovative solution to capitalize on a currently overlooked resource to produce high-performance lithium-sulfur (Li-S) batteries from recycled paper. The recycled paper fibers are creatively composited with graphene oxide sheets via a capillary adsorption method. The recycled paper/graphene oxide hybrid is then converted to activated paper carbon/reduced graphene oxide (APC/graphene) scaffold for sulfur infiltration...
September 20, 2017: Small
https://www.readbyqxmd.com/read/28939257/information-processing-across-behavioral-states-modes-of-operation-and-population-dynamics-in-rodent-sensory-cortex
#9
Mohammad Mahdi Sabri, Ehsan Arabzadeh
Animals live in a complex and changing environment with various degrees of behavioral demands. In rodents, the behavioral states can change from sleep and quiet wakefulness to active exploration of the environment which is often manifested by whisking and locomotion. Efficient information processing is more important in some of these behavioral states such as during episodes of sensory decision-making, and specific cortical areas are expected to receive priority of processing depending on the behavioral context...
September 20, 2017: Neuroscience
https://www.readbyqxmd.com/read/28929510/laminar-specific-encoding-of-texture-elements-in-rat-barrel-cortex
#10
Benjamin J Allitt, Dasuni S Alwis, Ramesh Rajan
Texture discrimination by rats is exquisitely guided by fine-grain mechanical stick-slip motions of the face whiskers as they encounter, stick to, and slip past successive texture-defining surface features like bumps and grooves. Neural encoding of successive stick-slip texture events will be shaped by adaptation, common to all sensory systems, whereby receptor and neural responses to a stimulus are affected by responses to preceding stimuli, allowing resetting to signal novel information. Additionally, when a whisker is actively moved to contact and brush over surfaces, that motion itself generates neural responses that could cause adaptation of responses to subsequent stick-slip events...
September 20, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28921729/long-range-cortical-dynamics-a-perspective-from-the-mouse-sensorimotor-whisker-system
#11
REVIEW
Jianguang Ni, Jerry L Chen
In the mammalian neocortex, the capacity to dynamically route and coordinate the exchange of information between areas is a critical feature of cognitive function, enabling processes such as higher-level sensory processing and sensorimotor integration. Despite the importance attributed to long-range connections between cortical areas, their exact operations and role in cortical function remain an open question. In recent years, progress has been made in understanding long-range cortical circuits through work focused on the mouse sensorimotor whisker system...
September 16, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28920083/differential-alterations-of-intracellular-ca-2-dynamics-induced-by-cocaine-and-methylphenidate-in-thalamocortical-ventrobasal-neurons
#12
José L Rozas, Belén Goitia, Verónica Bisagno, Francisco J Urbano
The ventrobasal (VB) thalamus relay nucleus processes information from rodents' whiskers, projecting to somatosensory cortex. Cocaine and methylphenidate (MPH) have been described to differentially alter intrinsic properties of, and spontaneous GABAergic input to, VB neurons. Here we studied using bis-fura 2 ratiometric fluorescence the effects of cocaine and MPH on intracellular [Ca(2+)] dynamics at the soma and dendrites of VB neurons. Cocaine increased baseline fluorescence in VB somatic and dendritic compartments...
July 2017: Translational Brain Rhythmicity
https://www.readbyqxmd.com/read/28919538/roles-of-n-methyl-d-aspartate-receptors-during-the-sensory-stimulation-evoked-field-potential-responses-in-mouse-cerebellar-cortical-molecular-layer
#13
Yin-Hua Xu, Guang-Jian Zhang, Jing-Tong Zhao, Chun-Ping Chu, Yu-Zi Li, De-Lai Qiu
The functions of N-methyl-d-aspartate receptors (NMDARs) in cerebellar cortex have been widely studied under in vitro condition, but their roles during the sensory stimulation-evoked responses in the cerebellar cortical molecular layer in living animals are currently unclear. We here investigated the roles of NMDARs during the air-puff stimulation on ipsilateral whisker pad-evoked field potential responses in cerebellar cortical molecular layer in urethane-anesthetized mice by electrophysiological recording and pharmacological methods...
September 14, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28919043/neocortical-dynamics-during-whisker-based-sensory-discrimination-in-head-restrained-mice
#14
Fritjof Helmchen, Ariel Gilad, Jerry L Chen
A fundamental task frequently encountered by brains is to rapidly and reliably discriminate between sensory stimuli of the same modality, be it distinct auditory sounds, odors, visual patterns, or tactile textures. A key mammalian brain structure involved in discrimination behavior is the neocortex. Sensory processing not only involves the respective primary sensory area, which is crucial for perceptual detection, but additionally relies on cortico-cortical communication among several regions including higher-order sensory areas as well as frontal cortical areas...
September 14, 2017: Neuroscience
https://www.readbyqxmd.com/read/28918260/organization-of-sensory-feature-selectivity-in-the-whisker-system
#15
Michael R Bale, Miguel Maravall
Our sensory receptors are faced with an onslaught of different environmental inputs. Each sensory event or encounter with an object involves a distinct combination of physical energy sources impinging upon receptors. In the rodent whisker system, each primary afferent neuron located in the trigeminal ganglion innervates and responds to a single whisker and encodes a distinct set of physical stimulus properties - features - corresponding to changes in whisker angle and shape and the consequent forces acting on the whisker follicle...
September 14, 2017: Neuroscience
https://www.readbyqxmd.com/read/28912671/brownian-optogenetic-noise-photostimulation-on-the-brain-amplifies-somatosensory-evoked-field-potentials
#16
Nayeli Huidobro, Abraham Mendez-Fernandez, Ignacio Mendez-Balbuena, Ranier Gutierrez, Rumyana Kristeva, Elias Manjarrez
Stochastic resonance (SR) is an inherent and counter-intuitive mechanism of signal-to-noise ratio (SNR) facilitation in biological systems associated with the application of an intermediate level of noise. As a first step to investigate in detail this phenomenon in the somatosensory system, here we examined whether the direct application of noisy light on pyramidal neurons from the mouse-barrel cortex expressing a light-gated channel channelrhodopsin-2 (ChR2) can produce facilitation in somatosensory evoked field potentials...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28904406/response-dynamics-of-rat-barrel-cortex-neurons-to-repeated-sensory-stimulation
#17
Ehsan Kheradpezhouh, Mehdi Adibi, Ehsan Arabzadeh
Neuronal adaptation is a common feature observed at various stages of sensory processing. Here, we quantified the time course of adaptation in rat somatosensory cortex. Under urethane anesthesia, we juxta-cellularly recorded single neurons (n = 147) while applying a series of whisker deflections at various frequencies (2-32 Hz). For ~90% of neurons, the response per unit of time decreased with frequency. The degree of adaptation increased along the train of deflections and was strongest at the highest frequency...
September 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28899918/adaptation-of-thalamic-neurons-provides-information-about-the-spatiotemporal-context-of-stimulus-history
#18
Chen Liu, Guglielmo Foffani, Alessandro Scaglione, Juan Aguilar, Karen A Moxon
Adaptation of neural responses due to the history of sensory input has been observed across all sensory modalities. However, the computational role of adaptation is not fully understood, especially when one considers neural coding problems in which adaptation increases the ambiguity of the neural responses to simple stimuli. To address this, we quantified the impact of adaptation on the information conveyed by thalamic neurons about paired whisker stimuli in male rat. At the single neuron level, although paired-pulse adaptation reduces the information about the present stimulus, the information per spike increases...
September 12, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28891910/descriptive-statistics-reporting-the-answers-to-the-5-basic-questions-of-who-what-why-when-where-and-a-sixth-so-what
#19
Thomas R Vetter
Descriptive statistics are specific methods basically used to calculate, describe, and summarize collected research data in a logical, meaningful, and efficient way. Descriptive statistics are reported numerically in the manuscript text and/or in its tables, or graphically in its figures. This basic statistical tutorial discusses a series of fundamental concepts about descriptive statistics and their reporting. The mean, median, and mode are 3 measures of the center or central tendency of a set of data. In addition to a measure of its central tendency (mean, median, or mode), another important characteristic of a research data set is its variability or dispersion (ie, spread)...
September 7, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28891783/cortical-local-field-potential-power-is-associated-with-behavioral-detection-of-near-threshold-stimuli-in-the-rat-whisker-system-dissociation-between-orbitofrontal-and-somatosensory-cortices
#20
Rachel E Rickard, Andrew M J Young, Todor V Gerdjikov
There is growing evidence that ongoing brain oscillations may represent a key regulator of attentional processes and as such may contribute to behavioral performance in psychophysical tasks. OFC appears to be involved in the top-down modulation of sensory processing; however, the specific contribution of ongoing OFC oscillations to perception has not been characterized. Here we used the rat whiskers as a model system to further characterize the relationship between cortical state and tactile detection. Head-fixed rats were trained to report the presence of a vibrotactile stimulus (frequency = 60 Hz, duration = 2 sec, deflection amplitude = 0...
September 11, 2017: Journal of Cognitive Neuroscience
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