Energy Efficiency of Fast-Spiking PV Interneuron Action Potentials

PV interneuron biophysics are optimized for high-frequency firing at near-theoretical energy efficiency. Changes to membrane properties (like PNN degradation increasing capacitance) have outsized effects on firing, but the models show capacitance alone cannot explain experimental observations, pointing to additional altered parameters.

{
  "papers": [
    {
      "n": 0,
      "doi": "10.1016/j.neuron.2018.02.024",
      "value": "1.6",
      "method": "axon recordings with biophysical modeling of Na+/K+ channel gating",
      "metric": "AP energy relative to theoretical minimum",
      "n_analyzed": null,
      "ci_or_error": null,
      "text_access": "fulltext",
      "n_definition": "axon recordings from PV+ basket cells",
      "scope_region": "hippocampus",
      "study_system": "PV+ basket cell axons, rat hippocampus",
      "taxonomic_level": "PV basket cells",
      "scope_population": "PV+ basket cell axons",
      "value_source_sentence": "Surprisingly, the energy required for the AP was, on average, only ∼1.6 times the theoretical minimum.",
      "experimental_conditions": "direct axon patch-clamp recordings"
    },
    {
      "n": 0,
      "doi": "10.1007/s10827-023-00849-9",
      "value": "25-50%",
      "method": "Hodgkin-Huxley to morphologically detailed models",
      "metric": "Capacitance increase from PNN degradation",
      "n_analyzed": null,
      "ci_or_error": null,
      "text_access": "fulltext",
      "n_definition": "computational models (HH to multi-compartment)",
      "scope_region": "neocortex (model)",
      "study_system": "single to multi-compartment PV neuron models",
      "taxonomic_level": "PV fast-spiking interneurons",
      "scope_population": "PV fast-spiking cells",
      "value_source_sentence": "Tewari et al. (2018) found that degradation of PNNs induced a 25%-50% increase in membrane capacitance cm and a reduction in the firing rates of PV-cells.",
      "experimental_conditions": "simulated PNN degradation via capacitance increase"
    }
  ],
  "comparison_id": "pv-energy-efficiency",
  "comparison_name": "Energy Efficiency of Fast-Spiking PV Interneuron Action Potentials",
  "comparison_type": "convergent evidence",
  "what_it_reveals": "PV interneuron biophysics are optimized for high-frequency firing at near-theoretical energy efficiency. Changes to membrane properties (like PNN degradation increasing capacitance) have outsized effects on firing, but the models show capacitance alone cannot explain experimental observations, pointing to additional altered parameters.",
  "homogeneity_check": {
    "caveats": [
      "Paper A is experimental (axon recordings) while Paper B is purely computational",
      "Different brain regions: hippocampus vs neocortex",
      "Different metrics: energy efficiency vs capacitance change - convergent on PV biophysics theme"
    ],
    "n_definition_uniform": "false",
    "scope_region_uniform": "false",
    "taxonomic_level_uniform": "true",
    "scope_population_uniform": "true"
  },
  "suggested_plot_type": "grouped bar"
}

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