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Tuning low-voltage-activated A-current for silent gain modulation.

Ameera X Patel¹, Naomi Murphy, Denis Burdakov

¹Brain Mapping Unit, Department of Psychiatry, University of Cambridge, Cambridge, UK. ap531@cam.ac.uk

Neural Computation

|September 14, 2012

Summary

This summary is machine-generated.

A-type potassium currents (I(A)) can independently control neural gain and firing rate. Tuning I(A) properties offers a novel mechanism for silent gain control in neurons.

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Area of Science:

Neuroscience
Computational Neuroscience
Ion Channel Physiology

Background:

Neural computation relies on modulating stimulus-response gain and spontaneous firing stability.
Mechanisms allowing neurons to control both gain and firing rate simultaneously are not well understood.
Low-threshold, inactivating (A-type) K(+) currents (I(A)) are known to support low-frequency firing.

Purpose of the Study:

To investigate if A-type K(+) currents can independently regulate neural gain and intrinsic firing properties.
To explore biologically plausible mechanisms for dissociated control of gain and firing rate within a single neuron.

Main Methods:

Utilized computational simulations of a conductance-based model neuron.
Investigated the effects of altering I(A) conductance and inactivation kinetics.

Main Results:

Biologically plausible changes in I(A) properties dissociated effects on neural gain and intrinsic firing rate.
I(A) modulation regulated gain without significantly altering spontaneous firing rates.
Demonstrated that I(A) can control neural gain independently of its effect on firing frequency.

Conclusions:

A-type K(+) currents offer a versatile mechanism for neural computation.
Tuning I(A) properties provides a single-current mechanism for silent gain control.
This finding reveals a previously unrecognized role for I(A) in neural information processing.