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Response features determining spike times.

B J Richmond1, M W Oram, M C Wiener

  • 1Laboratory of Neuropsychology, National Institute of Mental Health, Bethesda, MD, USA.

Neural Plasticity
|March 14, 2000
PubMed
Summary
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Neuronal responses encode information using spike count and firing rate modulation. Precisely timed spike patterns are redundant with coarse temporal structures, suggesting no fine-scale spike timing control.

Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Interpreting neuronal messages requires identifying informative response features.
  • Spike count and firing rate modulation (25 ms precision) convey information.
  • Precisely timed spike patterns (1 ms precision) may carry unique information.

Purpose of the Study:

  • To investigate whether precisely timed spike patterns carry information beyond spike count and rate modulation.
  • To determine the relationship between coarse temporal structures and fine temporal spike patterns in neuronal responses.

Main Methods:

  • Utilized a model incorporating spike count distribution, low-pass filtered PSTH (below 30 Hz), and interspike interval distribution.
  • Predicted the occurrence of exactly-timed spike triplets and quadruplets based on model parameters.

Related Experiment Videos

  • Compared model predictions with observed spike patterns in recorded data.

    • Main Results:

    • The model accurately predicted the numbers and types of exactly-timed spike patterns.
    • Coarse temporal correlation structure (below 30 Hz) underlies the observed fine temporal spike patterns.
    • Information in fine temporal structure is redundant with information in coarse temporal structure.

    Conclusions:

    • Precisely timed spike patterns do not imply independent information coding at fine timescales.
    • Coarse temporal firing rate modulation sufficiently explains the information content of fine temporal spike patterns.
    • Neuronal coding relies on broader temporal dynamics rather than precise spike timing.