Spike Propagation
Spike Propagation - Related Videos
08:48
Optical Recording of Suprathreshold Neural Activity with Single-cell and Single-spike Resolution
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Cited by 1 •
2012
Understanding the function of the vertebrate central nervous system requires recordings from many neurons because cortical function arises on the level of populations of neurons. Here we describe an optical method to record suprathreshold neural activity with single-cell and single-spike resolution, dithered random-access scanning. This method records somatic fluorescence calcium signals from up to 100 neurons with high temporal resolution. A maximum-likelihood algorithm deconvolves the...
02:19
Triggering a Closed-Loop Stimulation by Neuron Spiking Activity
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2025
This video demonstrates the operation of closed-loop stimulation in a rat with a surgically implanted device to record neural activity. Neuronal signals are first recorded and analyzed. Template waveforms are then uploaded, and parameters are defined to trigger closed-loop stimulation.
02:46
Visualizing Dose-Dependent Spike Protein Uptake with Quantum Dot Conjugates
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2026
Source: Tran, B. N., et. al. High-throughput Confocal Imaging of Quantum Dot-Conjugated SARS-CoV-2 Spike Trimers to Track Binding and Endocytosis in HEK293T Cells. J. Vis. Exp. (2022)This video demonstrates the use of quantum dot–conjugated spike protein (QD-Spike) to visualize dose-dependent viral entry in ACE2-GFP–expressing cells. Confocal imaging captures the internalization of QD-Spike via receptor-mediated endocytosis, modeling early coronavirus entry.
08:29
Averaging of Viral Envelope Glycoprotein Spikes from Electron Cryotomography Reconstructions using Jsubtomo
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Cited by 23 •
2014
An approach is presented for determining structures of viral membrane glycoprotein complexes using a combination of electron cryo-tomography and sub-tomogram averaging with the computational package Jsubtomo.
01:07
Propagation of Waves
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2023
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free. Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
FAQs
Threshold depolarization activates voltage-gated sodium channels, producing local currents that depolarize adjacent membrane regions. This sequential activation allows the impulse to continue along the excitable cell rather than remaining at its original site. Potassium-channel activity then restores membrane voltage, completing the characteristic sequence needed for continued signaling.
After a membrane region has generated an action potential, its refractory period limits immediate reactivation. Newly activated neighboring membrane can therefore continue the sequence while the region behind it is temporarily less responsive. This timing supports one-way travel and helps preserve directional information as the impulse moves along the cell.
Propagation speed, direction, and signal fidelity provide complementary measures of performance. Speed indicates how quickly the impulse travels, direction shows whether transmission follows the intended path, and fidelity reflects how well the signal is preserved. Together, these measurements help researchers characterize excitable cells and evaluate whether engineered systems reproduce useful electrical behavior.
A study can characterize propagation by measuring or modeling how quickly an impulse travels, which direction it follows, and whether its signal remains faithful. These analyses connect membrane-level electrical behavior with system-level performance. In bioengineering, the resulting information can guide designs that depend on reliable communication between excitable cells and engineered devices.
Understanding the movement and preservation of electrical impulses helps guide neural interfaces and electrophysiological sensors. Designers can use propagation speed, direction, and signal fidelity as performance considerations when developing systems intended to detect or interact with neural activity. These measures provide a basis for assessing whether an interface captures relevant electrical communication over distance.
Brain-computer interfaces and neural prostheses depend on interpreting or supporting electrical communication associated with excitable cells. Propagation analysis helps characterize the timing, direction, and fidelity of those signals, while modeling can support system development. This context is important when engineering devices intended to connect neural activity with external control or prosthetic function.