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Somatosensory temporal discrimination

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https://www.readbyqxmd.com/read/28276493/subliminal-stimuli-modulate-somatosensory-perception-rhythmically-and-provide-evidence-for-discrete-perception
#1
Thomas J Baumgarten, Sara Königs, Alfons Schnitzler, Joachim Lange
Despite being experienced as continuous, there is an ongoing debate if perception is an intrinsically discrete process, with incoming sensory information treated as a succession of single perceptual cycles. Here, we provide causal evidence that somatosensory perception is composed of discrete perceptual cycles. We used in humans an electrotactile temporal discrimination task preceded by a subliminal (i.e., below perceptual threshold) stimulus. Although not consciously perceived, subliminal stimuli are known to elicit neuronal activity in early sensory areas and modulate the phase of ongoing neuronal oscillations...
March 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28269555/feature-domain-specific-movement-intention-detection-for-stroke-rehabilitation-with-brain-computer-interfaces
#2
J T Hadsund, M B Sorensen, A C Royo, I K Niazi, H Rovsing, C Rovsing, M Jochumsen
Brain-computer interface (BCI) driven electrical stimulation has been proposed for neuromodulation for stroke rehabilitation by pairing intentions to move with somatosensory feedback from electrical stimulation. Movement intentions have been detected in several studies using different techniques, with temporal and spectral features being the most common. A few studies have compared temporal and spectral features, but conflicting results have been reported. In this study, the aim was to investigate if complexity measures can be used for movement intention detection and to compare the detection performance based on features extracted from three different domains (time, frequency and complexity) from single-trial EEG...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227809/feature-domain-specific-movement-intention-detection-for-stroke-rehabilitation-with-brain-computer-interfaces
#3
J T Hadsund, M B Sorensen, A C Royo, I K Niazi, H Rovsing, C Rovsing, M Jochumsen, J T Hadsund, M B Sorensen, A C Royo, I K Niazi, H Rovsing, C Rovsing, M Jochumsen, H Rovsing, M Jochumsen, M B Sorensen, C Rovsing, A C Royo, I K Niazi, J T Hadsund
Brain-computer interface (BCI) driven electrical stimulation has been proposed for neuromodulation for stroke rehabilitation by pairing intentions to move with somatosensory feedback from electrical stimulation. Movement intentions have been detected in several studies using different techniques, with temporal and spectral features being the most common. A few studies have compared temporal and spectral features, but conflicting results have been reported. In this study, the aim was to investigate if complexity measures can be used for movement intention detection and to compare the detection performance based on features extracted from three different domains (time, frequency and complexity) from single-trial EEG...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28163694/hand-to-face-remapping-but-no-differences-in-temporal-discrimination-observed-on-the-intact-hand-following-unilateral-upper-limb-amputation
#4
Kassondra L Collins, Danielle L McKean, Katherine Huff, Mark Tommerdahl, Oleg Vyacheslavovich Favorov, Robert S Waters, Jack W Tsao
Unilateral major limb amputation causes changes in sensory perception. Changes may occur within not only the residual limb but also the intact limb as well as the brain. We tested the hypothesis that limb amputation may result in the detection of hand sensation during stimulation of a non-limb-related body region. We further investigated the responses of unilateral upper limb amputees and individuals with all limbs intact to temporally based sensory tactile testing of the fingertips to test the hypothesis that changes in sensory perception also have an effect on the intact limb...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28163677/human-brain-activity-related-to-the-tactile-perception-of-stickiness
#5
Jiwon Yeon, Junsuk Kim, Jaekyun Ryu, Jang-Yeon Park, Soon-Cheol Chung, Sung-Phil Kim
While the perception of stickiness serves as one of the fundamental dimensions for tactile sensation, little has been elucidated about the stickiness sensation and its neural correlates. The present study investigated how the human brain responds to perceived tactile sticky stimuli using functional magnetic resonance imaging (fMRI). To evoke tactile perception of stickiness with multiple intensities, we generated silicone stimuli with varying catalyst ratios. Also, an acrylic sham stimulus was prepared to present a condition with no sticky sensation...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28035900/perceptually-relevant-remapping-of-human-somatotopy-in-24-hours
#6
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
https://www.readbyqxmd.com/read/27926827/decoding-hand-gestures-from-primary-somatosensory-cortex-using-high-density-ecog
#7
Mariana P Branco, Zachary V Freudenburg, Erik J Aarnoutse, Martin G Bleichner, Mariska J Vansteensel, Nick F Ramsey
Electrocorticography (ECoG) based Brain-Computer Interfaces (BCIs) have been proposed as a way to restore and replace motor function or communication in severely paralyzed people. To date, most motor-based BCIs have either focused on the sensorimotor cortex as a whole or on the primary motor cortex (M1) as a source of signals for this purpose. Still, target areas for BCI are not confined to M1, and more brain regions may provide suitable BCI control signals. A logical candidate is the primary somatosensory cortex (S1), which not only shares similar somatotopic organization to M1, but also has been suggested to have a role beyond sensory feedback during movement execution...
February 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/27872293/emergence-of-an-abstract-categorical-code-enabling-the-discrimination-of-temporally-structured-tactile-stimuli
#8
Román Rossi-Pool, Emilio Salinas, Antonio Zainos, Manuel Alvarez, José Vergara, Néstor Parga, Ranulfo Romo
The problem of neural coding in perceptual decision making revolves around two fundamental questions: (i) How are the neural representations of sensory stimuli related to perception, and (ii) what attributes of these neural responses are relevant for downstream networks, and how do they influence decision making? We studied these two questions by recording neurons in primary somatosensory (S1) and dorsal premotor (DPC) cortex while trained monkeys reported whether the temporal pattern structure of two sequential vibrotactile stimuli (of equal mean frequency) was the same or different...
December 6, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27815488/somatosensory-temporal-discrimation-remains-intact-in-tension-type-headache-whereas-it-is-disrupted-in-migraine-attacks
#9
Doga Vuralli, H Evren Boran, Bulent Cengiz, Ozlem Coskun, Hayrunnisa Bolay
BACKGROUND AND OBJECTIVE: Somatosensory temporal discrimination was recently reported as prolonged during migraine attacks, which is consistent with disrupted sensorial perception in migraine. However, knowledge about central sensory processing in tension-type headache is still lacking. This prospective, controlled study aimed to investigate somatosensory temporal discrimination thresholds in tension-type headache. METHODS: The study included 10 tension-type headache patients, 10 migraine patients and 10 healthy volunteers without headache...
November 4, 2016: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/27767240/a-somatosensory-to-motor-cascade-of-cortical-areas-engaged-in-perceptual-decision-making-during-tactile-pattern-discrimination
#10
Yiwen Li Hegner, Axel Lindner, Christoph Braun
The processes underlying perceptual decision making are diverse and typically engage a distributed network of brain areas. It is a particular challenge to establish a sensory-to-motor functional hierarchy in such networks. This is because single-cell recordings mainly study the nodes of decision networks in isolation but seldom simultaneously. Moreover, imaging methods, which allow simultaneously accessing information from overall networks, typically suffer from either the temporal or the spatial resolution necessary to establish a detailed functional hierarchy in terms of a sequential recruitment of areas during a decision process...
October 21, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/27755134/the-effect-of-l-dopa-carbidopa-intestinal-gel-in-parkinson-disease-assessed-using-neurophysiologic-techniques
#11
Matteo Bologna, Anna Latorre, Francesca Di Biasio, Antonella Conte, Daniele Belvisi, Nicola Modugno, Antonio Suppa, Alfredo Berardelli, Giovanni Fabbrini
BACKGROUND: By providing a stable and smooth L-dopa plasmatic level, L-dopa/carbidopa intestinal gel reproduces the physiological continuous dopaminergic receptor stimulation in patients with Parkinson disease (PD), and it therefore represents a suitable tool to investigate the role of the altered dopaminergic neurotransmission in the pathophysiology of motor and sensory abnormalities in this condition. METHODS: We studied 11 patients with advanced PD being treated with L-Dopa/carbidopa intestinal gel (LCIG) and 11 age-matched healthy subjects...
November 2016: Clinical Neuropharmacology
https://www.readbyqxmd.com/read/27671708/neurophysiological-correlates-of-abnormal-somatosensory-temporal-discrimination-in-dystonia
#12
Elena Antelmi, Roberto Erro, Lorenzo Rocchi, Rocco Liguori, Michele Tinazzi, Flavio Di Stasio, Alfredo Berardelli, John C Rothwell, Kailash P Bhatia
BACKGROUND: Somatosensory temporal discrimination threshold is often prolonged in patients with dystonia. Previous evidence suggested that this might be caused by impaired somatosensory processing in the time domain. Here, we tested if other markers of reduced inhibition in the somatosensory system might also contribute to abnormal somatosensory temporal discrimination in dystonia. METHODS: Somatosensory temporal discrimination threshold was measured in 19 patients with isolated cervical dystonia and 19 age-matched healthy controls...
September 27, 2016: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/27650249/understanding-the-link-between-somatosensory-temporal-discrimination-and-movement-execution-in-healthy-subjects
#13
Antonella Conte, Daniele Belvisi, Nicoletta Manzo, Matteo Bologna, Francesca Barone, Matteo Tartaglia, Neeraj Upadhyay, Alfredo Berardelli
The somatosensory temporal discrimination threshold (STDT) is the shortest interval at which an individual recognizes paired stimuli as separate in time. We investigated whether and how voluntary movement modulates STDT in healthy subjects. In 17 healthy participants, we tested STDT during voluntary index-finger abductions at several time-points after movement onset and during motor preparation. We then tested whether voluntary movement-induced STDT changes were specific for the body segment moved, depended on movement kinematics, on the type of movement or on the intensity for delivering paired electrical stimuli for STDT To understand the mechanisms underlying STDT modulation, we also tested STDT during motor imagery and after delivering repetitive transcranial magnetic stimulation to elicit excitability changes in the primary somatosensory cortex (S1)...
September 2016: Physiological Reports
https://www.readbyqxmd.com/read/27650127/cortical-plasticity-in-patients-with-median-nerve-lesions-studied-with-meg
#14
Lotta Fornander, Tom Brismar, Thomas Hansson, Heidi Wikström
We have previously shown age- and time-dependent effects on brain activity in the primary somatosensory cortex (SI), in a functional magnetic resonance imaging (fMRI) study of patients with median nerve injury. Whereas fMRI measures the hemodynamic changes in response to increased neural activity, magnetoencephalography (MEG) offers a more concise way of examining the evoked response, with superior temporal resolution. We therefore wanted to combine these imaging techniques to gain additional knowledge of the plasticity processes in response to median nerve injury...
September 2016: Somatosensory & Motor Research
https://www.readbyqxmd.com/read/27634554/chronic-migraine-is-associated-with-sustained-elevation-of-somatosensory-temporal-discrimination-thresholds
#15
Doga Vuralli, H Evren Boran, Bulent Cengiz, Ozlem Coskun, Hayrunnisa Bolay
BACKGROUND AND OBJECTIVE: Migraine headache attacks have been shown to be accompanied by significant prolongation of somatosensory temporal discrimination threshold values, supporting signs of disrupted sensorial processing in migraine. Chronic migraine is one of the most debilitating and challenging headache disorders with no available biomarker. We aimed to test the diagnostic value of somatosensory temporal discrimination for chronic migraine in this prospective, controlled study. METHODS: Fifteen chronic migraine patients and 15 healthy controls completed the study...
October 2016: Headache
https://www.readbyqxmd.com/read/27574970/short-time-scale-sensory-coding-in-s1-during-discrimination-of-whisker-vibrotactile-sequences
#16
Leah M McGuire, Gregory Telian, Keven J Laboy-Juárez, Toshio Miyashita, Daniel J Lee, Katherine A Smith, Daniel E Feldman
Rodent whisker input consists of dense microvibration sequences that are often temporally integrated for perceptual discrimination. Whether primary somatosensory cortex (S1) participates in temporal integration is unknown. We trained rats to discriminate whisker impulse sequences that varied in single-impulse kinematics (5-20-ms time scale) and mean speed (150-ms time scale). Rats appeared to use the integrated feature, mean speed, to guide discrimination in this task, consistent with similar prior studies...
August 2016: PLoS Biology
https://www.readbyqxmd.com/read/27458837/somatosensory-temporal-discrimination-threshold-in-parkinson-s-disease-parallels-disease-severity-and-duration
#17
Antonella Conte, Giorgio Leodori, Gina Ferrazzano, Maria I De Bartolo, Nicoletta Manzo, Giovanni Fabbrini, Alfredo Berardelli
OBJECTIVE: To investigate whether the somatosensory temporal discrimination threshold (STDT) is already altered at the clinical onset of Parkinson's disease (PD) and whether STDT abnormalities correlate with disease progression we tested STDT values in patients with different severity of disease. METHODS: We prospectively and consecutively enrolled 63 PD patients: 26 drug-naive PD patients with symptom onset no longer than two years prior to inclusion in the study (early-phase), 37 PD patients with varying degrees of disease severity and 51 age-matched healthy subjects...
September 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27422224/functional-consequences-of-experience-dependent-plasticity-on-tactile-perception-following-perceptual-learning
#18
Natalie K Trzcinski, Manuel Gomez-Ramirez, Steven S Hsiao
Continuous training enhances perceptual discrimination and promotes neural changes in areas encoding the experienced stimuli. This type of experience-dependent plasticity has been demonstrated in several sensory and motor systems. Particularly, non-human primates trained to detect consecutive tactile bar indentations across multiple digits showed expanded excitatory receptive fields (RFs) in somatosensory cortex. However, the perceptual implications of these anatomical changes remain undetermined. Here, we trained human participants for 9 days on a tactile task that promoted expansion of multi-digit RFs...
September 2016: European Journal of Neuroscience
https://www.readbyqxmd.com/read/27021016/perirhinal-cortex-supports-tactual-discrimination-tasks-with-increasing-levels-of-complexity-retrograde-effect
#19
Juan M J Ramos
Recent studies have suggested that the perirhinal cortex (Prh) supports representations of feature conjunctions in the visual modality during the acquisition/encoding of complex discriminations. To extend this idea to other sensory modalities and to another stage of the discrimination process, we studied the effect of Prh lesions on the expression of a series of tactual discrimination tasks learned preoperatively. These tasks differed from one another in the degree of feature overlap of the stimuli and in the difficulty of the task...
May 2016: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/26758826/somatosensory-temporal-discrimination-threshold-involves-inhibitory-mechanisms-in-the-primary-somatosensory-area
#20
Lorenzo Rocchi, Elias Casula, Pierluigi Tocco, Alfredo Berardelli, John Rothwell
UNLABELLED: Somatosensory temporal discrimination threshold (STDT) is defined as the shortest time interval necessary for a pair of tactile stimuli to be perceived as separate. Although STDT is altered in several neurological disorders, its neural bases are not entirely clear. We used continuous theta burst stimulation (cTBS) to condition the excitability of the primary somatosensory cortex in healthy humans to examine its possible contribution to STDT. Excitability was assessed using the recovery cycle of the N20 component of somatosensory evoked potentials (SEP) and the area of high-frequency oscillations (HFO)...
January 13, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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