keyword
MENU ▼
Read by QxMD icon Read
search

Neuroprosthetics

keyword
https://www.readbyqxmd.com/read/28489913/human-perception-of-electrical-stimulation-on-the-surface-of-somatosensory-cortex
#1
Shivayogi V Hiremath, Elizabeth C Tyler-Kabara, Jesse J Wheeler, Daniel W Moran, Robert A Gaunt, Jennifer L Collinger, Stephen T Foldes, Douglas J Weber, Weidong Chen, Michael L Boninger, Wei Wang
Recent advancement in electrocorticography (ECoG)-based brain-computer interface technology has sparked a new interest in providing somatosensory feedback using ECoG electrodes, i.e., cortical surface electrodes. We conducted a 28-day study of cortical surface stimulation in an individual with arm paralysis due to brachial plexus injury to examine the sensation produced by electrical stimulation of the somatosensory cortex. A high-density ECoG grid was implanted over the somatosensory and motor cortices. Stimulation through cortical surface electrodes over the somatosensory cortex successfully elicited arm and hand sensations in our participant with chronic paralysis...
2017: PloS One
https://www.readbyqxmd.com/read/28456231/a-memory-efficient-implementation-scheme-of-gauss-error-function-in-a-laguerre-volterra-network-for-neuroprosthetic-devices
#2
Will X Y Li, Ke Cui, Wei Zhang
Cognitive neural prosthesis is a manmade device which can be used to restore or compensate for lost human cognitive modalities. The generalized Laguerre-Volterra (GLV) network serves as a robust mathematical underpinning for the development of such prosthetic instrument. In this paper, a hardware implementation scheme of Gauss error function for the GLV network targeting reconfigurable platforms is reported. Numerical approximations are formulated which transform the computation of nonelementary function into combinational operations of elementary functions, and memory-intensive look-up table (LUT) based approaches can therefore be circumvented...
April 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28450831/cycle-triggered-cortical-stimulation-during-slow-wave-sleep-facilitates-learning-a-bmi-task-a-case-report-in-a-non-human-primate
#3
Irene Rembado, Stavros Zanos, Eberhard E Fetz
Slow wave sleep (SWS) has been identified as the sleep stage involved in consolidating newly acquired information. A growing body of evidence has shown that delta (1-4 Hz) oscillatory activity, the characteristic electroencephalographic signature of SWS, is involved in coordinating interaction between the hippocampus and the neocortex and is thought to take a role in stabilizing memory traces related to a novel task. This case report describes a new protocol that uses neuroprosthetics training of a non-human primate to evaluate the effects of surface cortical electrical stimulation triggered from SWS cycles...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28443786/characterization-of-volitional-electromyographic-signals-in-the-lower-extremity-after-motor-complete-spinal-cord-injury
#4
Elizabeth Heald, Ronald Hart, Kevin Kilgore, P Hunter Peckham
BACKGROUND: Previous studies have demonstrated the presence of intact axons across a spinal cord lesion, even in those clinically diagnosed with complete spinal cord injury (SCI). These axons may allow volitional motor signals to be transmitted through the injury, even in the absence of visible muscle contraction. OBJECTIVE: To demonstrate the presence of volitional electromyographic (EMG) activity below the lesion in motor complete SCI and to characterize this activity to determine its value for potential use as a neuroprosthetic command source...
April 1, 2017: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/28437614/engineering-highly-interconnected-neuronal-networks-on-nanowire-scaffolds
#5
Vini Gautam, Shagufta Naureen, Naeem Shahid, Qian Gao, Yi Wang, David Nisbet, Chennupati Jagadish, Vincent R Daria
Identifying the specific role of physical guidance cues in the growth of neurons is crucial for understanding the fundamental biology of brain development and for designing scaffolds for tissue engineering. Here, we investigate the structural significance of nanoscale topographies as physical cues for neurite outgrowth and circuit formation by growing neurons on semiconductor nanowires. We monitored neurite growth using optical and scanning electron microscopy and evaluated the spontaneous neuronal network activity using functional calcium imaging...
May 4, 2017: Nano Letters
https://www.readbyqxmd.com/read/28382924/fascicular-nerve-stimulation-and-recording-using-a-novel-double-aisle-regenerative-electrode
#6
Ignacio Delgado-Martínez, Martina Righi, Daniel Santos, Annarita Cutrone, Silvia Bossi, Silvia D'Amico, Jaume Del Valle, Silvestro Micera, Xavier Navarro
OBJECTIVE: As artificial prostheses become more refined, they are most often used as a therapeutic option for hand amputation. Differently from extra- or intraneural interfaces, regenerative nerve electrodes are designed to enable electrical interface with regrowing axonal bundles of injured nerves, aiming to achieve high selectivity for recording and stimulation. However, most of the developed designs pose an obstacle to the regrowth mechanisms due to low transparency and cause an impairment of the nerve regeneration...
April 6, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28374841/artificial-spatiotemporal-touch-inputs-reveal-complementary-decoding-in-neocortical-neurons
#7
Calogero M Oddo, Alberto Mazzoni, Anton Spanne, Jonas M D Enander, Hannes Mogensen, Fredrik Bengtsson, Domenico Camboni, Silvestro Micera, Henrik Jörntell
Investigations of the mechanisms of touch perception and decoding has been hampered by difficulties in achieving invariant patterns of skin sensor activation. To obtain reproducible spatiotemporal patterns of activation of sensory afferents, we used an artificial fingertip equipped with an array of neuromorphic sensors. The artificial fingertip was used to transduce real-world haptic stimuli into spatiotemporal patterns of spikes. These spike patterns were delivered to the skin afferents of the second digit of rats via an array of stimulation electrodes...
April 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28366027/detecting-destabilizing-wheelchair-conditions-for-maintaining-seated-posture
#8
Anna Crawford, Kiley Armstrong, Kenneth Loparo, Musa Audu, Ronald Triolo
PURPOSE: The purpose of this study was to detect and classify potentially destabilizing conditions encountered by manual wheelchair users with spinal cord injuries (SCI) to dynamically increase stability and prevent falls. METHODS: A volunteer with motor complete T11 paraplegia repeatedly propelled his manual wheelchair over level ground and simulated destabilizing conditions including sudden stops, bumps and rough terrain. Wireless inertial measurement units attached to the wheelchair frame and his sternum recorded associated accelerations and angular velocities...
April 1, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28363481/reaching-again-a-glimpse-of-the-future-with-neuroprosthetics
#9
Steve I Perlmutter
No abstract text is available yet for this article.
March 28, 2017: Lancet
https://www.readbyqxmd.com/read/28348511/constraints-and-adaptation-of-closed-loop-neuroprosthetics-for-functional-restoration
#10
Robert Bauer, Alireza Gharabaghi
Closed-loop neuroprosthetics aim to compensate for lost function, e.g., by controlling external devices such as prostheses or wheelchairs. Such assistive approaches seek to maximize speed and classification accuracy for high-dimensional control. More recent approaches use similar technology, but aim to restore lost motor function in the long term. To achieve this goal, restorative neuroprosthetics attempt to facilitate motor re-learning and to strengthen damaged and/or alternative neural connections on the basis of neurofeedback training within rehabilitative environments...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28338618/real-time-gait-event-detection-based-on-kinematic-data-coupled-to-a-biomechanical-model-%C3%A2
#11
Stefan Lambrecht, Anna Harutyunyan, Kevin Tanghe, Maarten Afschrift, Joris De Schutter, Ilse Jonkers
Real-time detection of multiple stance events, more specifically initial contact (IC), foot flat (FF), heel off (HO), and toe off (TO), could greatly benefit neurorobotic (NR) and neuroprosthetic (NP) control. Three real-time threshold-based algorithms have been developed, detecting the aforementioned events based on kinematic data in combination with a biomechanical model. Data from seven subjects walking at three speeds on an instrumented treadmill were used to validate the presented algorithms, accumulating to a total of 558 steps...
March 24, 2017: Sensors
https://www.readbyqxmd.com/read/28325029/noninvasive-eeg-correlates-of-overground-and-stair-walking
#12
Justin A Brantley, Trieu Phat Luu, Recep Ozdemir, Fangshi Zhu, Anna T Winslow, Helen Huang, Jose L Contreras-Vidal
Automated walking intention detection remains a challenge in lower-limb neuroprosthetic systems. Here, we assess the feasibility of extracting motor intent from scalp electroencephalography (EEG). First, we evaluated the corticomuscular coherence between central EEG electrodes (C1, Cz, C2) and muscles of the shank and thigh during walking on level ground and stairs. Second, we trained decoders to predict the linear envelope of the surface electromyogram (EMG). We observed significant EEG-led corticomuscular coupling between electrodes and sEMG (tibialis anterior) in the high delta (3-4 Hz) and low theta (4-5 Hz) frequency bands during level walking, indicating efferent signaling from the cortex to peripheral motor neurons...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324946/characterization-of-motor-cortex-activity-of-the-lower-limb-region
#13
Fadi Mikhail, Karthikeyan Balasubramanian, Matthew D Best, Kazutaka Takahashi, Nicholas G Hatsopoulos
Understanding the functional properties of the motor cortex is a key step to developing effective neuroprosthetic and computer interfaces for amputees and patients with spinal cord injury. Most efforts have been directed towards studying the upper limb region of the motor cortex. Little has been done in the way of addressing lower limb motor cortical physiology. In this study, we implanted multiple microelectrode arrays along the central sulcus in the primary motor cortex of a macaque monkey. Using intracortical microstimulation, we identified neurons that evoked leg movements, either exclusively or mostly, and we studied their firing activity during a center-out arm movement task...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28321887/simplification-of-visual-rendering-in-simulated-prosthetic-vision-facilitates-navigation
#14
Victor Vergnieux, Marc J-M Macé, Christophe Jouffrais
Visual neuroprostheses are still limited and simulated prosthetic vision (SPV) is used to evaluate potential and forthcoming functionality of these implants. SPV has been used to evaluate the minimum requirement on visual neuroprosthetic characteristics to restore various functions such as reading, objects and face recognition, object grasping, etc. Some of these studies focused on obstacle avoidance but only a few investigated orientation or navigation abilities with prosthetic vision. The resolution of current arrays of electrodes is not sufficient to allow navigation tasks without additional processing of the visual input...
March 21, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28284918/intracortical-microstimulation-differentially-activates-cortical-layers-based-on-stimulation-depth
#15
Mathias Benjamin Voigt, Peter Hubka, Andrej Kral
BACKGROUND: Intracortical microstimulation is one of the most common techniques to causally interfere with neuronal processing, but neuronal recordings spanning the whole cortical depth during stimulation are exceptionally rare. OBJECTIVE/HYPOTHESIS: Here we combined layer-specific intracortical microstimulation with extracellular recordings on the same shank of a linear multi-electrode array to study the effects of electrical stimulation in different cortical depths on intracortical processing in the auditory cortex in vivo...
May 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28269360/development-of-high-impedance-measurement-system-for-water-leakage-detection-in-implantable-neuroprosthetic-devices
#16
Aziz Yousif, Shawn K Kelly
There has been a push for a greater number of channels in implantable neuroprosthetic devices; but, that number has largely been limited by current hermetic packaging technology. Microfabricated packaging is becoming reality, but a standard testing system is needed to prepare these devices for clinical trials. Impedance measurements of electrodes built into the packaging layers may give an early warning of device failure and predict device lifetime. Because the impedance magnitudes of such devices can be on the order of gigaohms, a versatile system was designed to accommodate ultra-high impedances and allow future integrated circuit implementation in current neural prosthetic technologies...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268959/modeling-distinct-sources-of-neural-variability-driving-neuroprosthetic-control
#17
Preeya Khanna, Vivek R Athalye, Suraj Gowda, Rui M Costa, Jose M Carmena
Many closed-loop, continuous-control brain-machine interface (BMI) architectures rely on decoding via a linear readout of noisy population neural activity. However, recent work has found that decomposing neural population activity into correlated and uncorrelated variability reveals that improvements in cursor control coincide with the emergence of correlated neural variability. In order to address how correlated and uncorrelated neural variability arises and contributes to BMI cursor control, we simulate a neural population receiving combinations of shared inputs affecting all cells and private inputs affecting only individual cells...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268628/idle-state-classification-using-spiking-activity-and-local-field-potentials-in-a-brain-computer-interface
#18
Jordan J Williams, Rex N Tien, Yoh Inoue, Andrew B Schwartz
Previous studies of intracortical brain-computer interfaces (BCIs) have often focused on or compared the use of spiking activity and local field potentials (LFPs) for decoding kinematic movement parameters. Conversely, using these signals to detect the initial intention to use a neuroprosthetic device or not has remained a relatively understudied problem. In this study, we examined the relative performance of spiking activity and LFP signals in detecting discrete state changes in attention regarding a user's desire to actively control a BCI device...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28231470/rapid-integration-of-artificial-sensory-feedback-during-operant-conditioning-of-motor-cortex-neurons
#19
Mario Prsa, Gregorio L Galiñanes, Daniel Huber
Neuronal motor commands, whether generating real or neuroprosthetic movements, are shaped by ongoing sensory feedback from the displacement being produced. Here we asked if cortical stimulation could provide artificial feedback during operant conditioning of cortical neurons. Simultaneous two-photon imaging and real-time optogenetic stimulation were used to train mice to activate a single neuron in motor cortex (M1), while continuous feedback of its activity level was provided by proportionally stimulating somatosensory cortex...
February 22, 2017: Neuron
https://www.readbyqxmd.com/read/28227810/noninvasive-eeg-correlates-of-overground-and-stair-walking
#20
Justin A Brantley, Trieu Phat Luu, Recep Ozdemir, Fangshi Zhu, Anna T Winslow, Helen Huang, Jose L Contreras-Vidal, Justin A Brantley, Trieu Phat Luu, Recep Ozdemir, Fangshi Zhu, Anna T Winslow, Helen Huang, Jose L Contreras-Vidal, Fangshi Zhu, Recep Ozdemir, Justin A Brantley, Helen Huang, Anna T Winslow, Jose L Contreras-Vidal, Trieu Phat Luu
Automated walking intention detection remains a challenge in lower-limb neuroprosthetic systems. Here, we assess the feasibility of extracting motor intent from scalp electroencephalography (EEG). First, we evaluated the corticomuscular coherence between central EEG electrodes (C1, Cz, C2) and muscles of the shank and thigh during walking on level ground and stairs. Second, we trained decoders to predict the linear envelope of the surface electromyogram (EMG). We observed significant EEG-led corticomuscular coupling between electrodes and sEMG (tibialis anterior) in the high delta (3-4 Hz) and low theta (4-5 Hz) frequency bands during level walking, indicating efferent signaling from the cortex to peripheral motor neurons...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
keyword
keyword
21191
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"