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Physiological properties of Cantor coding-like iterated function system in the hippocampal CA1 network.

Yasuhiro Fukushima1,2, Yutaka Yamaguti3, Shigeru Kuroda4

  • 1Comprehensive Education Center, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki, Okayama 700-0193 Japan.

Cognitive Neurodynamics
|August 9, 2021
PubMed
Summary

Cantor coding in the hippocampus uses spatial patterns, not just on-off signals, for learning and memory. Inhibitory networks refine this code, especially under different activation levels.

Keywords:
HippocampusIterated function systemPatch-clamp recordingSingle neuronSpatiotemporal coding

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Cantor coding is an information coding scheme for temporal event sequences.
  • A Cantor coding-like mechanism, related to iterated function systems, is observed in hippocampal CA3-CA1 pyramidal neurons.
  • The detailed physiological properties of this system in CA1, particularly concerning learning and memory, are not fully understood.

Purpose of the Study:

  • To analyze the properties of the Cantor coding-like system in the CA1 network relevant to the physiological basis of learning and memory.
  • To investigate if the system relies solely on excitatory postsynaptic potential (EPSP) amplitude on-off responses or involves spatial patterns.
  • To determine the dependency of the system on sequential input intervals and the role of the inhibitory network.

Main Methods:

  • Applied spatially distinct input patterns with similar EPSP peak amplitudes to analyze membrane responses and spatial clustering.
  • Utilized spatiotemporal sequential inputs at various intervals to identify optimal timing.
  • Administered a GABA_A receptor blocker (gabazine) to assess the inhibitory network's influence on code discrimination under subthreshold and suprathreshold conditions.

Main Results:

  • Membrane responses exhibited significant differences in spatial clustering, suggesting factors beyond simple on-off EPSP responses are involved.
  • An optimal sequential input interval of 30 ms was identified, consistent with physiological CA3-CA1 input.
  • Code discrimination quality was reduced under subthreshold conditions and enhanced under suprathreshold conditions after gabazine application, indicating the inhibitory network's role in differentiating responses.

Conclusions:

  • The Cantor coding-like iterated function system in the CA1 network appears to utilize spatial patterns and is modulated by inhibitory networks.
  • This system's properties suggest its suitability for information processing related to learning and memory in the hippocampus.
  • The findings highlight the complex interplay of excitation and inhibition in shaping neural information coding.