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1 Department of Neuroscience, University of Pennsylvania, Philadelphia, PA, USA
2 Department of Neuroscience, Brown University, Providence, RI, USA
* To whom correspondence should be addressed. E-mail: rob{at}retina.anatomy.upenn.edu.
Information in a spike train is limited by variability in the spike timing. This variability is caused by noise from several sources including synapses and membrane channels, but how deleterious each noise source is and how they affect spike train coding is unknown. Combining physiology and a multi-compartment model we studied the effect of synaptic input noise and voltage-gated channel noise on spike train reliability for a mammalian ganglion cell. For tonic stimuli the standard deviation of the interspike intervals increased supra-linearly with increasing interspike interval. When the cell was driven by current injection, voltage gated channel noise and background synaptic noise caused fluctuations in the interspike interval of comparable amplitude. Spikes initiated on the dendrites could cause additional spike timing fluctuations. For transient stimuli, synaptic noise was dominant and spontaneous background activity strongly increased fluctuations in spike timing, but decreased the latency of the first spike.
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