In recurrent cortical circuits with strong but balanced excitation and inhibiti…

In recurrent cortical circuits with strong but balanced excitation and inhibition, 'balanced amplification' arises as a non-normal mechanism that selectively amplifies activity patterns without slowing dynamics — providing the theoretical framework for E→E recurrent gain in cortex.

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  "doi": "10.1016/j.neuron.2009.02.005",
  "claim": "In recurrent cortical circuits with strong but balanced excitation and inhibition, 'balanced amplification' arises as a non-normal mechanism that selectively amplifies activity patterns without slowing dynamics — providing the theoretical framework for E→E recurrent gain in cortex.",
  "cite_key": "Murphy2009",
  "evidence": "Linear analysis of E/I recurrent network with Dale's law shows non-normal dynamics with hidden feedforward connectivity between activity patterns; biophysical model reproduces V1 ongoing activity statistics.",
  "effect_size": "qualitative — non-normal amplification arises in any balanced E/I recurrent network",
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  "claim_source_sentence": "When excitation and inhibition are both strong but balanced, as is thought to be the case in cerebral cortex, balanced amplification arises: small patterned fluctuations of the difference between excitation and inhibition drive large patterned fluctuations of the sum.",
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  "replication_evidence_dois": [
    "10.1103/PhysRevE.86.011909",
    "10.1016/j.neuron.2018.02.031",
    "10.1016/j.neuron.2023.11.005"
  ],
  "effect_size_source_sentence": null
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When excitation and inhibition are both strong but balanced, as is thought to be the case in cerebral cortex, balanced amplification arises: small patterned fluctuations of the difference between excitation and inhibition drive large patterned fluctuations of the sum.

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