The descending volley evoked by electrical and magnetic transcranial stimulation was recorded with spinal electrodes in 3 subjects undergoing spinal surgery. The descending volley evoked by electrical stimulation, as previously described, was composed by a short-latency initial wave followed by later waves. In two subjects magnetic stimulation evoked an initial wave of slightly longer latency (0.2-0.3 ms), smaller amplitude and higher threshold than the initial wave evoked by electrical stimulation. In these two subjects, magnetic stimuli probably activated the pyramidal axons directly. In the third subject the initial wave evoked by magnetic stimulation had a latency of 1.4 ms longer and a considerably smaller amplitude than that evoked by electrical stimulation. In this case magnetic stimulation may activate the pyramidal axons indirectly.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0304-3940(90)90321-y | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The mechanisms of frequency tuning in gecko auditory hair cells.
Hear Res
January 2025
Department of Neuroscience, University of Wisconsin-Madison, WI 53706, USA.
We developed an isolated auditory papilla of the crested gecko to record from the hair cells and explore the origins of frequency tuning. Low-frequency cells displayed electrical tuning, dependent on Ca-activated K channels; high-frequency cells, overlain with sallets, showed a variation in hair bundle stiffness which when combined with sallet mass could provide a mechanical resonance of 1 to 6 kHz. Sinusoidal electrical currents injected extracellularly evoked hair bundle oscillations at twice the stimulation frequency, consistent with fast electromechanical responses from hair bundles of two opposing orientations, as occur in the sallets.
View Article and Find Full Text PDFLeveraging eCAP thresholds in a logistic model to predict speech outcomes after implantation in anomalous cochlea.
Acta Otolaryngol
January 2025
Neuro-Otology, Department of Neurosurgery, SGPGIMS, Lucknow, Uttar Pradesh, India.
Background: Pediatric cochlear implant (CI) recipients with cochlear malformations face challenges due to variable speech recognition outcomes.
Aims/objectives: This study assesses the predictive value of intraoperative electrically evoked compound action potential (eCAP) thresholds, residual hearing, age at implantation, Intelligent Quotient (IQ), and malformation type for speech recognition outcomes.
Material And Methods: A prospective cohort of 52 children (aged 1-4 years) with cochlear malformations who underwent CI between 2016 and 2024 was analyzed.
Implications of Hemispheric Shift of Sensory Feedback during Post-stroke Motor Control on Personalized Stroke Rehabilitation.
Converg Clin Eng Res Neurorehabilit V (2024)
December 2024
University of Illinois Urbana-Champaign, Urbana, IL, USA; Carle Foundation Hospital, Urbana, IL, USA; Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL 60611, USA.
Sensory feedback is crucial for motor control as it establishes the internal representation of motion. This study investigates changes in sensory feedback in hemiparetic stroke by analyzing the laterality index (LI) of somatosensory evoked potentials (SEPs) during movements of the paretic arm, focusing on a shift from the lesioned to the contralesional hemisphere. Three chronic stroke participants performed isometric lifts of their paretic arms at two different levels of their maximum voluntary contraction while receiving tactile finger stimulation.
View Article and Find Full Text PDFNeuromuscular electrical stimulation producing low evoked force elicits the repeated bout effect on muscle damage markers of the elbow flexors.
Sports Med Health Sci
March 2025
Applied Neuromuscular Physiology Laboratory, Department of Kinesiology, Applied Health, and Recreation, Oklahoma State University, Stillwater, OK, 74075, USA.
This study examined the repeated bout effect (RBE) on muscle damage markers following two bouts of neuromuscular electrical stimulation (NMES) in untrained individuals. Following familiarization, participants received 45 consecutive NMES to the biceps brachii at an intensity that produced low evoked force for the elbow flexors. Muscle damage markers (maximal voluntary isometric contraction [MVIC], elbow range of motion [ROM], muscle soreness via visual analogue scale [VAS] scores, pressure pain threshold [PPT], and muscle thickness) were measured before (PRE), after (POST), 1 day after (24 POST), and 2 days after (48 POST) NMES.
View Article and Find Full Text PDFZero-echo time imaging achieves whole brain activity mapping without ventral signal loss in mice.
Neuroimage
January 2025
Department of Neuroscience, The Jikei University School of Medicine, Tokyo, Japan; Human Informatics and Interaction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan; Faculty of Engineering, University of Tsukuba, Tsukuba, Japan. Electronic address:
Functional MRI (fMRI) is an important tool for investigating functional networks. However, the widely used fMRI with T2*-weighted imaging in rodents has the problem of signal lack in the lateral ventral area of forebrain including the amygdala, which is essential for not only emotion but also noxious pain. Here, we scouted the zero-echo time (ZTE) sequence, which is robust to magnetic susceptibility and motion-derived artifacts, to image activation in the whole brain including the amygdala following the noxious stimulation to the hind paw.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!