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Published on: September 30, 2014
Enhanced neuronal response induced by fast inhibition
1Center for Neural Science, New York University, New York, NY 10003, USA.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 21, 2006
Summary
Inhibitory synaptic input can surprisingly enhance neuron firing rates, challenging traditional neuroscience views. This occurs through specific timing interactions that temporarily lower the spike threshold.
Area of Science:
- Neuroscience
- Computational Neuroscience
- Computational Biology
Background:
- Conventional understanding posits that inhibitory synaptic input suppresses neuronal firing.
- This view is based on the direct hyperpolarizing effect of inhibitory potentials.
Purpose of the Study:
- To investigate a counterintuitive phenomenon where inhibitory input facilitates neuronal firing.
- To elucidate the underlying mechanisms of this facilitatory role of inhibition.
Main Methods:
- Utilized the Hodgkin-Huxley model for simulating neuronal spike generation.
- Employed random Poisson trains of subthreshold excitatory and inhibitory inputs.
- Performed phase-plane analysis on a simplified two-variable model.
Main Results:
- Demonstrated that specific, brief inhibitory inputs can enhance firing rate.
- Observed that favorable timing between inhibition and excitation reduces the spike threshold.
- Identified a mechanism where inhibition, counterintuitively, facilitates action potential generation.
Conclusions:
- Inhibitory synaptic input can play a facilitatory role in neuronal excitability.
- The timing of inhibitory and excitatory inputs is critical in determining neuronal output.
- This finding challenges the classical understanding of neural inhibition and opens new avenues for studying neural circuits.
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