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https://www.readbyqxmd.com/read/28323166/neural-foundations-of-overt-and-covert-actions
#1
Panagiotis G Simos, Eleftherios Kavroulakis, Thomas Maris, Efrosini Papadaki, Themistoklis Boursianis, Giorgos Kalaitzakis, Helen E Savaki
We used fMRI to assess the human brain areas activated for execution, observation and 1(st) person motor imagery of a visually guided tracing task with the index finger. Voxel-level conjunction analysis revealed several cortical areas activated in common across all three motor conditions, namely, the upper limb representation of the primary motor and somatosensory cortices, the dorsal and ventral premotor, the superior and inferior parietal cortices as well as the posterior part of the superior and middle temporal gyrus including the temporo-parietal junction (TPj) and the extrastriate body area (EBA)...
March 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28322985/visual-object-separation-resolves-competitive-interactions-in-somatosensory-cortex-evoked-signals-during-concurrent-vibrotactile-stimulation-of-the-left-and-right-hand
#2
Cheuk Yee Pang, Matthias M Müller
We investigated the effect of visual separation of the left and right hemispaces within peripersonal space to sustained tactile spatial attention processing and show that visually perceived object separation weakens the competitive interaction for concurrent vibrotactile stimulation to two hands. Participants received concurrent vibrotactile stimulation at different frequencies on two hands (right: 20Hz; left: 24Hz) for 4500ms to elicit steady-state somatosensory evoked potentials (SSSEPs). They attended to one of the stimulated hands and reacted to rare transient events embedded in the attended ongoing stream...
March 17, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28319608/cerebellar-granule-cells-acquire-a-widespread-predictive-feedback-signal-during-motor-learning
#3
Andrea Giovannucci, Aleksandra Badura, Ben Deverett, Farzaneh Najafi, Talmo D Pereira, Zhenyu Gao, Ilker Ozden, Alexander D Kloth, Eftychios Pnevmatikakis, Liam Paninski, Chris I De Zeeuw, Javier F Medina, Samuel S-H Wang
Cerebellar granule cells, which constitute half the brain's neurons, supply Purkinje cells with contextual information necessary for motor learning, but how they encode this information is unknown. Here we show, using two-photon microscopy to track neural activity over multiple days of cerebellum-dependent eyeblink conditioning in mice, that granule cell populations acquire a dense representation of the anticipatory eyelid movement. Initially, granule cells responded to neutral visual and somatosensory stimuli as well as periorbital airpuffs used for training...
March 20, 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28314184/how-does-the-body-representation-system-develop-in-the-human-brain
#4
Aurelie Fontan, Fabien Cignetti, Bruno Nazarian, Jean-Luc Anton, Marianne Vaugoyeau, Christine Assaiante
Exploration of the body representation system (BRS) from kinaesthetic illusions in fMRI has revealed a complex network composed of sensorimotor and frontoparietal components. Here, we evaluated the degree of maturity of this network in children aged 7-11 years, and the extent to which structural factors account for network differences with adults. Brain activation following tendon vibration at 100Hz ('illusion') and 30Hz ('no illusion') were analysed using the two-stage random effects model, with or without white and grey matter covariates...
February 28, 2017: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/28260189/behavioral-pieces-of-neuroethological-puzzles
#5
Kenneth C Catania
In this review, I give a first-person account of surprising insights that have come from the behavioral dimension of neuroethological studies in my laboratory. These studies include the early attempts to understand the function of the nose in star-nosed moles and to explore its representation in the neocortex. This led to the discovery of a somatosensory fovea that parallels the visual fovea of primates in several ways. Subsequent experiments to investigate the assumed superiority of star-nosed moles to their relatives when locating food led to the unexpected discovery of stereo olfaction in common moles...
March 4, 2017: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/28242742/correction-to-precision-mapping-of-the-vibrissa-representation-within-murine-primary-somatosensory-cortex
#6
Per M Knutsen, Celine Mateo, David Kleinfeld
No abstract text is available yet for this article.
April 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28222382/corporeal-illusions-in-chronic-spinal-cord-injuries
#7
Michele Scandola, Salvatore Maria Aglioti, Renato Avesani, Gianettore Bertagnoni, Anna Marangoni, Valentina Moro
While several studies have investigated corporeal illusions in patients who have suffered from a stroke or undergone an amputation, only anecdotal or single case reports have explored this phenomenon after spinal cord injury. Here we examine various different types of bodily misperceptions in a comparatively large group of 49 people with spinal cord injury in the post-acute and chronic phases after the traumatic lesion onset. An extensive battery of questionnaires concerning a variety of body related feelings was administered and the results were correlated to the main clinical variables...
March 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28220044/pregnenolone-blocks-cannabinoid-induced-acute-psychotic-like-states-in-mice
#8
A Busquets-Garcia, E Soria-Gómez, B Redon, Y Mackenbach, M Vallée, F Chaouloff, M Varilh, G Ferreira, P-V Piazza, G Marsicano
Cannabis-induced acute psychotic-like states (CIAPS) represent a growing health issue, but their underlying neurobiological mechanisms are poorly understood. The use of antipsychotics and benzodiazepines against CIAPS is limited by side effects and/or by their ability to tackle only certain aspects of psychosis. Thus, safer wide-spectrum treatments are currently needed. Although the blockade of cannabinoid type-1 receptor (CB1) had been suggested as a therapeutical means against CIAPS, the use of orthosteric CB1 receptor full antagonists is strongly limited by undesired side effects and low efficacy...
February 21, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28214130/stability-of-sensory-topographies-in-adult-cortex
#9
REVIEW
Tamar R Makin, Sliman J Bensmaia
Textbooks teach us that the removal of sensory input to sensory cortex, for example, following arm amputation, results in massive reorganisation in the adult brain. In this opinion article, we critically examine evidence for functional reorganisation of sensory cortical representations, focusing on the sequelae of arm amputation on somatosensory topographies. Based on literature from human and non-human primates, we conclude that the cortical representation of the limb remains remarkably stable despite the loss of its main peripheral input...
February 14, 2017: Trends in Cognitive Sciences
https://www.readbyqxmd.com/read/28196765/visual-illusion-of-tool-use-recalibrates-tactile-perception
#10
Luke E Miller, Matthew R Longo, Ayse P Saygin
Brief use of a tool recalibrates multisensory representations of the user's body, a phenomenon called tool embodiment. Despite two decades of research, little is known about its boundary conditions. It has been widely argued that embodiment requires active tool use, suggesting a critical role for somatosensory and motor feedback. The present study used a visual illusion to cast doubt on this view. We used a mirror-based setup to induce a visual experience of tool use with an arm that was in fact stationary...
February 11, 2017: Cognition
https://www.readbyqxmd.com/read/28191033/algorithm-and-software-to-automatically-identify-latency-and-amplitude-features-of-local-field-potentials-recorded-in-electrophysiological-investigation
#11
Maria Rubega, Claudia Cecchetto, Stefano Vassanelli, Giovanni Sparacino
BACKGROUND: Local field potentials (LFPs) evoked by sensory stimulation are particularly useful in electrophysiological research. For instance, spike timing and current transmembrane current flow estimated from LFPs recorded in the barrel cortex in rats and mice are exploited to investigate how the brain represents sensory stimuli. Recent improvements in microelectrodes technology enable neuroscientists to acquire a great amount of LFPs during the same experimental session, calling for algorithms for their quantitative automatic analysis...
2017: Source Code for Biology and Medicine
https://www.readbyqxmd.com/read/28153687/error-related-negativity-in-the-skilled-brain-of-pianists-reveals-motor-simulation
#12
Alice Mado Proverbio, Matteo Cozzi, Andrea Orlandi, Manuel Carminati
Evidences have been provided of a crucial role of multimodal audio-visuomotor processing in subserving the musical ability. In this paper we investigated whether musical audiovisual stimulation might trigger the activation of motor information in the brain of professional pianists, due to the presence of permanent gestures/sound associations. At this aim EEG was recorded in 24 pianists and naive participants engaged in the detection of rare targets while watching hundreds of video clips showing a pair of hands in the act of playing, along with a compatible or incompatible piano soundtrack...
January 30, 2017: Neuroscience
https://www.readbyqxmd.com/read/28139959/inside-speech-multisensory-and-modality-specific-processing-of-tongue-and-lip-speech-actions
#13
Avril Treille, Coriandre Vilain, Thomas Hueber, Laurent Lamalle, Marc Sato
Action recognition has been found to rely not only on sensory brain areas but also partly on the observer's motor system. However, whether distinct auditory and visual experiences of an action modulate sensorimotor activity remains largely unknown. In the present sparse sampling fMRI study, we determined to which extent sensory and motor representations interact during the perception of tongue and lip speech actions. Tongue and lip speech actions were selected because tongue movements of our interlocutor are accessible via their impact on speech acoustics but not visible because of its position inside the vocal tract, whereas lip movements are both "audible" and visible...
March 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28139019/from-single-cells-single-columns-to-cortical-networks-dendritic-excitability-coincidence-detection-and-synaptic-transmission-in-brain-slices-and-brains
#14
Bert Sakmann
While patch pipettes were initially designed to record extracellularly elementary current events from muscle and neuron membrane, the whole-cell (eg Sakmann, 1992) and loose cell-attached recording configurations proved to be useful tools for examining signaling within and between nerve cells. In this Paton Lecture I will summarize first work on electrical signaling within single neurons, describing communication between its dendritic compartments, soma and nerve terminals via forward and backward propagating action potentials...
January 31, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28119344/dermatomal-organization-of-si-leg-representation-in-humans-revising-the-somatosensory-homunculus
#15
Caroline Dietrich, Kathrin R Blume, Marcel Franz, Ralph Huonker, Maria Carl, Sandra Preißler, Gunther O Hofmann, Wolfgang H R Miltner, Thomas Weiss
Penfield and Rasmussen's homunculus is the valid map of the neural body representation of nearly each textbook of biology, physiology, and neuroscience. The somatosensory homunculus places the foot representation on the mesial surface of the postcentral gyrus followed by the representations of the lower leg and the thigh in superio-lateral direction. However, this strong homuncular organization contradicts the "dermatomal" organization of spinal nerves. We used somatosensory-evoked magnetic fields and source analysis to study the leg's neural representation in the primary somatosensory cortex (SI)...
January 23, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28095365/barreloid-borders-and-neuronal-activity-shape-panglial-gap-junction-coupled-networks-in-the-mouse-thalamus
#16
Lena Claus, Camille Philippot, Stephanie Griemsmann, Aline Timmermann, Ronald Jabs, Christian Henneberger, Helmut Kettenmann, Christian Steinhäuser
The ventral posterior nucleus of the thalamus plays an important role in somatosensory information processing. It contains elongated cellular domains called barreloids, which are the structural basis for the somatotopic organization of vibrissae representation. So far, the organization of glial networks in these barreloid structures and its modulation by neuronal activity has not been studied. We have developed a method to visualize thalamic barreloid fields in acute slices. Combining electrophysiology, immunohistochemistry, and electroporation in transgenic mice with cell type-specific fluorescence labeling, we provide the first structure-function analyses of barreloidal glial gap junction networks...
November 24, 2016: Cerebral Cortex
https://www.readbyqxmd.com/read/28093551/multiple-shared-mechanisms-for-homeostatic-plasticity-in-rodent-somatosensory-and-visual-cortex
#17
REVIEW
Melanie A Gainey, Daniel E Feldman
We compare the circuit and cellular mechanisms for homeostatic plasticity that have been discovered in rodent somatosensory (S1) and visual (V1) cortex. Both areas use similar mechanisms to restore mean firing rate after sensory deprivation. Two time scales of homeostasis are evident, with distinct mechanisms. Slow homeostasis occurs over several days, and is mediated by homeostatic synaptic scaling in excitatory networks and, in some cases, homeostatic adjustment of pyramidal cell intrinsic excitability. Fast homeostasis occurs within less than 1 day, and is mediated by rapid disinhibition, implemented by activity-dependent plasticity in parvalbumin interneuron circuits...
March 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28069761/functional-and-quantitative-mri-mapping-of-somatomotor-representations-of-human-supralaryngeal-vocal-tract
#18
Daniel Carey, Saloni Krishnan, Martina F Callaghan, Martin I Sereno, Frederic Dick
Speech articulation requires precise control of and coordination between the effectors of the vocal tract (e.g., lips, tongue, soft palate, and larynx). However, it is unclear how the cortex represents movements of and contact between these effectors during speech, or how these cortical responses relate to inter-regional anatomical borders. Here, we used phase-encoded fMRI to map somatomotor representations of speech articulations. Phonetically trained participants produced speech phones, progressing from front (bilabial) to back (glottal) place of articulation...
January 8, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28053026/self-grounded-vision-hand-ownership-modulates-visual-location-through-cortical-%C3%AE-and-%C3%AE-oscillations
#19
Nathan Faivre, Jonathan Dönz, Michele Scandola, Herberto Dhanis, Javier Bello Ruiz, Fosco Bernasconi, Roy Salomon, Olaf Blanke
Vision is known to be shaped by context, defined by environmental and bodily signals. In the Taylor illusion, the size of an afterimage projected on one's hand changes according to proprioceptive signals conveying hand position. Here, we assessed whether the Taylor illusion does not just depend on the physical hand position, but also on bodily self-consciousness as quantified through illusory hand ownership. Relying on the somatic rubber hand illusion, we manipulated hand ownership, such that participants embodied a rubber hand placed next to their own hand...
January 4, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28035900/perceptually-relevant-remapping-of-human-somatotopy-in-24-hours
#20
James Kolasinski, Tamar R Makin, John P Logan, Saad Jbabdi, Stuart Clare, Charlotte J Stagg, Heidi Johansen-Berg
Experience-dependent reorganisation of functional maps in the cerebral cortex is well described in the primary sensory cortices. However, there is relatively little evidence for such cortical reorganisation over the short-term. Using human somatosensory cortex as a model, we investigated the effects of a 24 hr gluing manipulation in which the right index and right middle fingers (digits 2 and 3) were adjoined with surgical glue. Somatotopic representations, assessed with two 7 tesla fMRI protocols, revealed rapid off-target reorganisation in the non-manipulated fingers following gluing, with the representation of the ring finger (digit 4) shifted towards the little finger (digit 5) and away from the middle finger (digit 3)...
December 30, 2016: ELife
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