keyword
MENU ▼
Read by QxMD icon Read
search

somatosensory representation

keyword
https://www.readbyqxmd.com/read/28926418/hemispheric-dominance-for-stereognosis-in-a-patient-with-an-infarct-of-the-left-postcentral-sensory-hand-area
#1
Jorge Moll, Ricardo de Oliveira-Souza
The concept of left hemispheric dominance for praxis, speech, and language has been one of the pillars of neurology since the mid-19th century. In 1906, Hermann Oppenheim reported a patient with bilateral stereoagnosia (astereognosis) caused by a left parietal lobe tumor and proposed that the left hemisphere was also dominant for stereognosis. Surprisingly, few cases of bilateral stereoagnosia caused by a unilateral cerebral lesion have been documented in the literature since then. Here we report a 75-year-old right-handed man who developed bilateral stereoagnosia after suffering a small infarct in the crown of the left postcentral gyrus...
September 2017: Cognitive and Behavioral Neurology: Official Journal of the Society for Behavioral and Cognitive Neurology
https://www.readbyqxmd.com/read/28919043/neocortical-dynamics-during-whisker-based-sensory-discrimination-in-head-restrained-mice
#2
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/28904101/methodological-considerations-for-a-chronic-neural-interface-with-the-cuneate-nucleus-of-macaques
#3
Aneesha K Suresh, Jeremy Winberry, Christopher Versteeg, Raeed H Chowdhury, Tucker Tomlinson, Joshua M Rosenow, Lee E Miller, Sliman J Bensmaia
While the response properties of neurons in the somatosensory nerves and anterior parietal cortex have been extensively studied, little is known about the encoding of tactile and proprioceptive information in the cuneate nucleus (CN) or external cuneate nucleus (ECN), the first recipients of upper limb somatosensory afferent signals. The major challenge in characterizing neural coding in CN/ECN has been to record from these tiny, difficult to access brainstem structures. Most previous investigations of CN response properties have been carried out in decerebrate or anesthetized animals, thereby eliminating the well-documented top-down signals from cortex, which likely exert a strong influence on CN responses...
September 13, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28843415/complexity-vs-unity-in-unilateral-spatial-neglect
#4
REVIEW
G Rode, M Fourtassi, C Pagliari, L Pisella, Y Rossetti
Unilateral spatial neglect constitutes a heterogeneous syndrome characterized by two main entangled components: a contralesional bias of spatial attention orientation; and impaired building and/or exploration of mental representations of space. These two components are present in different subtypes of unilateral spatial neglect (visual, auditory, somatosensory, motor, allocentric, egocentric, personal, representational and productive manifestations). Detailed anatomical and clinical analyses of these conditions and their underlying disorders show the complexity of spatial cognitive deficits and the difficulty of proposing just one explanation...
August 23, 2017: Revue Neurologique
https://www.readbyqxmd.com/read/28841675/neural-encoding-of-saltatory-pneumotactile-velocity-in-human-glabrous-hand
#5
Hyuntaek Oh, Rebecca Custead, Yingying Wang, Steven Barlow
Neurons in the somatosensory cortex are exquisitely sensitive to mechanical stimulation of the skin surface. The location, velocity, direction, and adaptation of tactile stimuli on the skin's surface are discriminable features of somatosensory processing, however the representation and processing of dynamic tactile arrays in the human somatosensory cortex are poorly understood. The principal aim of this study was to map the relation between dynamic saltatory pneumatic stimuli at discrete traverse velocities on the glabrous hand and the resultant pattern of evoked BOLD response in the human brain...
2017: PloS One
https://www.readbyqxmd.com/read/28827090/organization-of-orientation-specific-whisker-deflection-responses-in-layer-2-3-of-mouse-somatosensory-cortex
#6
Sung Eun Kwon, Vassiliy Tsytsarev, Reha S Erzurumlu, Daniel H O'Connor
The rodent whisker-barrel system is characterized by its patterned somatotopic mapping between the sensory periphery and multiple regions of the brain. While somatotopy in the whisker system is established, we know far less about how preferences for stimulus orientation or other features are organized. Mouse somatosensation is an increasingly popular model for circuit-based dissection of perceptual decision making and learning, yet our understanding of how stimulus feature representations are organized in the cortex is incomplete...
August 4, 2017: Neuroscience
https://www.readbyqxmd.com/read/28822751/using-multi-level-bayesian-lesion-symptom-mapping-to-probe-the-body-part-specificity-of-gesture-imitation-skills
#7
Elisabeth I S Achilles, Peter H Weiss, Gereon R Fink, Ellen Binder, Cathy J Price, Thomas M H Hope
Past attempts to identify the neural substrates of hand and finger imitation skills in the left hemisphere of the brain have yielded inconsistent results. Here, we analyse those associations in a large sample of 257 left hemisphere stroke patients. By introducing novel Bayesian methods, we characterise lesion symptom associations at three levels: the voxel-level, the single-region level (using anatomically defined regions), and the region-pair level. The results are inconsistent across those three levels and we argue that each level of analysis makes assumptions which constrain the results it can produce...
August 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28810440/nature-relatedness-is-connected-with-modern-health-worries-and-electromagnetic-hypersensitivity
#8
Zsuzsanna Dömötör, Renáta Szemerszky, Ferenc Köteles
Although nature relatedness is considered a positive characteristic, its relationship to constructs involving worries about the negative effects of artificial environmental factors is also feasible. A questionnaire assessing modern health worries, electrosensitivity, somatosensory amplification, spirituality, and nature relatedness was completed by 510 individuals. Nature relatedness was related to electrosensitivity, modern health worries, and spirituality. In a binary logistic regression analysis, somatosensory amplification, modern health worries, and nature relatedness were associated with electrosensitivity, and nature relatedness moderated the connection between modern health worries and electrosensitivity...
March 1, 2017: Journal of Health Psychology
https://www.readbyqxmd.com/read/28801252/measuring-the-effects-of-attention-to-individual-fingertips-in-somatosensory-cortex-using-ultra-high-field-7t-fmri
#9
Alexander M Puckett, Saskia Bollmann, Markus Barth, Ross Cunnington
Attention to sensory information has been shown to modulate the neuronal processing of that information. For example, visuospatial attention acts by modulating responses at retinotopically appropriate regions of visual cortex (Puckett and DeYoe, 2015; Tootell et al. 1998). Much less, however, is known about the neuronal processing associated with attending to other modalities of sensory information. One reason for this is that visual cortex is relatively large, and therefore easier to access non-invasively in humans using tools such as functional magnetic resonance imaging (fMRI)...
August 8, 2017: NeuroImage
https://www.readbyqxmd.com/read/28796326/gustatory-and-olfactory-responses-to-stimulation-of-the-human-insula
#10
Laure Mazzola, Jean-Pierre Royet, Hélène Catenoix, Alexandra Montavont, Jean Isnard, François Mauguière
OBJECTIVE: Despite numerous studies suggesting the role of insular cortex in the processing of gustatory and olfactory inputs, the exact location of olfactogustatory representation in the insula remains controversial. Here we provide a functional mapping of olfactory-gustatory responses to stimulation of the human insular cortex. METHODS: We reviewed 651 electrical stimulations of the insula that were performed in 221 patients, using stereotactically implanted depth electrodes, during the presurgical evaluation of drug-refractory epilepsy...
August 10, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28777059/modality-specific-changes-in-motor-cortex-excitability-after-visuo-proprioceptive-realignment
#11
Felipe Munoz-Rubke, Jasmine L Mirdamadi, Anna K Lynch, Hannah J Block
Spatial realignment of visual and proprioceptive estimates of hand position is necessary both to keep the estimates in register over time and to compensate for sensory perturbations. Such realignment affects perceived hand position, which the brain must use to plan hand movements. We would therefore expect visuo-proprioceptive realignment to affect the motor system at some level, but the physiological basis of this interaction is unknown. Here, we asked whether activity in primary motor cortex (M1), a well-known substrate of motor control, shows evidence of change after visuo-proprioceptive realignment...
August 4, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28765375/evidence-for-frequency-dependent-cortical-plasticity-in-the-human-brain
#12
Caroline A Lea-Carnall, Nelson J Trujillo-Barreto, Marcelo A Montemurro, Wael El-Deredy, Laura M Parkes
Frequency-dependent plasticity (FDP) describes adaptation at the synapse in response to stimulation at different frequencies. Its consequence on the structure and function of cortical networks is unknown. We tested whether cortical "resonance," favorable stimulation frequencies at which the sensory cortices respond maximally, influenced the impact of FDP on perception, functional topography, and connectivity of the primary somatosensory cortex using psychophysics and functional imaging (fMRI). We costimulated two digits on the hand synchronously at, above, or below the resonance frequency of the somatosensory cortex, and tested subjects' accuracy and speed on tactile localization before and after costimulation...
August 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28761076/-embodied-body-language-an-electrical-neuroimaging-study-with-emotional-faces-and-bodies
#13
Marta Calbi, Monica Angelini, Vittorio Gallese, Maria Alessandra Umiltà
To date, most investigations in the field of affective neuroscience mainly focused on the processing of facial expressions, overlooking the exploration of emotional body language (EBL), its capability to express our emotions notwithstanding. Few electrophysiological studies investigated the time course and the neural correlates of EBL and the integration of face and body emotion-related information. The aim of the present study was to investigate both the time course and the neural correlates underlying the integration of affective information conveyed by faces and bodies...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28759805/common-and-distinct-neural-mechanisms-associated-with-the-conscious-experience-of-vicarious-pain
#14
Thomas Grice-Jackson, Hugo D Critchley, Michael J Banissy, Jamie Ward
Vicarious pain perception has been an influential paradigm for investigating the social neuroscience of empathy. This research has highlighted the importance of both shared representations (i.e., involved in both experiencing first-hand physical pain and observing pain) and mechanisms that discriminate between self and other. The majority of this research has been conducted in healthy younger adults using a group-average approach. There are, however, known inter-individual differences that can contribute to vicarious experience...
July 3, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28732749/body-representation-disorders-predict-left-right-orientation-impairments-after-stroke-a%C3%A2-voxel-based-lesion-symptom-mapping-study
#15
Haike E van Stralen, H Chris Dijkerman, J Matthijs Biesbroek, Hugo J Kuijf, H Maarten A van Gemert, David Sluiter, L Jaap Kappelle, Martine J E van Zandvoort
INTRODUCTION: Deficits in the ability to distinguish between the left and right side of the body can severely impair daily life functioning. The current study examined the relation between left right orientation (LRO) impairments and somatosensory related deficits, ranging from primary somatosensory impairments to body representation impairments, in patients who suffered a recent stroke. We also examined which areas in the brain are associated with LRO impairments using a Voxel-based Lesion Symptom Mapping (VLSM) analysis...
June 7, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28721455/volume-electron-microscopy-of-the-distribution-of-synapses-in-the-neuropil-of-the-juvenile-rat-somatosensory-cortex
#16
A Santuy, J R Rodriguez, J DeFelipe, A Merchan-Perez
Knowing the proportions of asymmetric (excitatory) and symmetric (inhibitory) synapses in the neuropil is critical for understanding the design of cortical circuits. We used focused ion beam milling and scanning electron microscopy (FIB/SEM) to obtain stacks of serial sections from the six layers of the juvenile rat (postnatal day 14) somatosensory cortex (hindlimb representation). We segmented in three-dimensions 6184 synaptic junctions and determined whether they were established on dendritic spines or dendritic shafts...
July 18, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28716932/body-ownership-determines-the-attenuation-of-self-generated-tactile-sensations
#17
Konstantina Kilteni, H Henrik Ehrsson
Self-perception depends on the brain's abilities to differentiate our body from the environment and to distinguish between the sensations generated as a consequence of voluntary movement and those arising from events in the external world. The first process refers to the sense of ownership of our body and relies on the dynamic integration of multisensory (afferent) signals. The second process depends on internal forward models that use (efferent) information from our motor commands to predict and attenuate the sensory consequences of our movements...
August 1, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28702834/the-recalibration-of-tactile-perception-during-tool-use-is-body-part-specific
#18
Luke E Miller, Andrew Cawley-Bennett, Matthew R Longo, Ayse P Saygin
Two decades of research have demonstrated that using a tool modulates spatial representations of the body. Whether this embodiment is specific to representations of the tool-using limb or extends to representations of other body parts has received little attention. Several studies of other perceptual phenomena have found that modulations to the primary somatosensory representation of the hand transfers to the face, due in part to their close proximity in primary somatosensory cortex. In the present study, we investigated whether tool-induced recalibration of tactile perception on the hand transfers to the cheek...
July 12, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28697903/implicit-self-other-discrimination-affects-the-interplay-between-multisensory-affordances-of-mental-representations-of-faces
#19
David Zeugin, Norhan Arfa, Michael Notter, Micah M Murray, Silvio Ionta
Face recognition is an apparently straightforward but, in fact, complex ability, encompassing the activation of at least visual and somatosensory representations. Understanding how identity shapes the interplay between these face-related affordances could clarify the mechanisms of self-other discrimination. To this aim, we exploited the so-called "face inversion effect" (FIE), a specific bias in the mental rotation of face images (of other people): with respect to inanimate objects, face images require longer time to be mentally rotated from the upside-down...
July 8, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28691602/somatosensory-feedback-to-the-cheek-during-virtual-visual-feedback-therapy-enhances-pain-alleviation-for-phantom-arms
#20
Akimichi Ichinose, Yuko Sano, Michihiro Osumi, Masahiko Sumitani, Shin-Ichiro Kumagaya, Yasuo Kuniyoshi
BACKGROUND: Patients who suffer from phantom limb pain can perceive tactile stimuli applied to the cheek on their affected side as if it were coming from their phantom limb, a phenomenon called "referred sensation." OBJECTIVES: To investigate the analgesic effect produced by tactile feedback provided to the cheek during neurorehabilitation using visual feedback. METHODS: Nine participants with phantom upper limb pain performed virtual reality neurorehabilitation exercises in which they repeatedly touched a target object with a virtual representation of their affected limb...
August 2017: Neurorehabilitation and Neural Repair
keyword
keyword
98683
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"