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J Neurophysiol (May 1, 2003). 10.1152/jn.01106.2002
Submitted on Submitted 10 December 2002; accepted in final form 17 January 2003
1Department of Neuroscience, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6058; and 2Department of Neuroscience, Brown University, Providence, Rhode Island 02912
van Rossum, M.C.W.,
B. J. O'Brien, and
R. G. Smith.
Effects of Noise on the Spike Timing Precision of Retinal
Ganglion Cells. J. Neurophysiol. 89: 2406-2419, 2003. 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 multicompartment 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
SD of the interspike intervals increased supralinearly 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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