Flexible resonance in prefrontal networks with strong feedback inhibition

Oscillations are ubiquitous features of brain dynamics that undergo task-related changes in synchrony, power, and frequency. The impact of those changes on target networks is poorly understood. In this work, we used a biophysically detailed model of prefrontal cortex (PFC) to explore the effects of...

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Veröffentlicht in:PLoS computational biology 2018-08, Vol.14 (8), p.e1006357-e1006357
Hauptverfasser: Sherfey, Jason S, Ardid, Salva, Hass, Joachim, Hasselmo, Michael E, Kopell, Nancy J
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Ardid, Salva
Hass, Joachim
Hasselmo, Michael E
Kopell, Nancy J
description Oscillations are ubiquitous features of brain dynamics that undergo task-related changes in synchrony, power, and frequency. The impact of those changes on target networks is poorly understood. In this work, we used a biophysically detailed model of prefrontal cortex (PFC) to explore the effects of varying the spike rate, synchrony, and waveform of strong oscillatory inputs on the behavior of cortical networks driven by them. Interacting populations of excitatory and inhibitory neurons with strong feedback inhibition are inhibition-based network oscillators that exhibit resonance (i.e., larger responses to preferred input frequencies). We quantified network responses in terms of mean firing rates and the population frequency of network oscillation; and characterized their behavior in terms of the natural response to asynchronous input and the resonant response to oscillatory inputs. We show that strong feedback inhibition causes the PFC to generate internal (natural) oscillations in the beta/gamma frequency range (>15 Hz) and to maximize principal cell spiking in response to external oscillations at slightly higher frequencies. Importantly, we found that the fastest oscillation frequency that can be relayed by the network maximizes local inhibition and is equal to a frequency even higher than that which maximizes the firing rate of excitatory cells; we call this phenomenon population frequency resonance. This form of resonance is shown to determine the optimal driving frequency for suppressing responses to asynchronous activity. Lastly, we demonstrate that the natural and resonant frequencies can be tuned by changes in neuronal excitability, the duration of feedback inhibition, and dynamic properties of the input. Our results predict that PFC networks are tuned for generating and selectively responding to beta- and gamma-rhythmic signals due to the natural and resonant properties of inhibition-based oscillators. They also suggest strategies for optimizing transcranial stimulation and using oscillatory networks in neuromorphic engineering.
doi_str_mv 10.1371/journal.pcbi.1006357
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subjects Biology and Life Sciences
Brain
Brain research
Computer and Information Sciences
Dopamine
Excitability
Feedback
Feedback inhibition
Firing rate
Frequency ranges
Funding
Inhibition
Mathematics
Medicine and Health Sciences
Networks
Neural networks
Neurophysiology
Neurosciences
Optimization
Oscillations
Oscillators
Physical Sciences
Physiological aspects
Physiological regulation
Population
Prefrontal cortex
Resonance
Resonant frequencies
Rhythm
Rhythms
Signal processing
title Flexible resonance in prefrontal networks with strong feedback inhibition
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