Related Experiment Video
Updated: Aug 16, 2026

Modeling Fast-scan Cyclic Voltammetry Data from Electrically Stimulated Dopamine Neurotransmission Data Using QNsim1.0
Published on: June 5, 2017
Stochastic modeling of facilitated neurosecretion
M Bykhovskaia1, M K Worden, J T Hackett
1Department of Molecular Physiology and Biological Physics, University of Virginia Health Sciences Center, Charlottesville 22906-0011, USA.
Neurosecretion models were tested for predicting quantal content. A mobilization model accurately describes frequency facilitation by enhancing vesicle release with each stimulus.
Area of Science:
- Neuroscience
- Cell Biology
- Biophysics
Background:
- Neurosecretion, the release of neurotransmitters, is crucial for neuronal communication.
- Understanding the mechanisms governing quantal content (m) and frequency facilitation is essential.
Purpose of the Study:
- To evaluate two models of neurosecretion for predicting quantal content (m) dependency on stimulation frequency.
- To determine the best model for explaining frequency facilitation in lobster motoneurons.
Main Methods:
- Testing a fixed-release-site model using binomial statistics.
- Employing Monte Carlo simulations for a vesicle mobilization model.
Main Results:
- The fixed-release-site model showed limited statistical significance due to numerous parameters.
- The vesicle mobilization model accurately reproduced observed quantal content distributions with few parameters.
- This suggests mobilization of extra vesicles enhances quantal release.
Conclusions:
- Vesicle mobilization is a key mechanism for accurate quantitative description of frequency facilitation.
- The tested mobilization model offers a parsimonious explanation for frequency-dependent neurosecretion.
Related Concept Videos
Fusion of Secretory Vesicles with the Plasma Membrane
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
Excitatory and Inhibitory Effects of Neurotransmitters
The Role of Ion Channels in Neuronal Computation
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Neurochemical Transmission: Sites of Drug Action

