Neural wave interference and intrinsic tuning in distributed excitatory-inhibitory networks

TL;DR

This paper presents a neural network model of cortical circuits that captures how excitatory and inhibitory interactions produce intrinsic spatial frequency preferences, which vary with stimulus contrast and relate to properties of the macaque MT area.

Contribution

The study introduces a distributed neural circuit model that links excitation-inhibition balance to intrinsic spatial frequency tuning and its contrast-dependent dynamics.

Findings

Intrinsic spatial frequency depends on excitation-inhibition weights.

Preference shifts with stimulus contrast and temporal frequency.

Model aligns with properties of macaque cortical area MT.

Abstract

We developed a model of cortical computation that implements key features of cortical circuitry and is capable of describing propagation of neural signals between cortical locations in response to spatially distributed stimuli. The model is based on the canonical neural circuit that consists of excitatory and inhibitory cells interacting through reciprocal connections, with recurrent feedback. The canonical circuit is used as a node in a distributed network with nearest neighbor coupling between the nodes. We find that this system is characterized by intrinsic preference for spatial frequency. The value of preferred frequency depends on the relative weights of excitatory and inhibitory connections between cells. This balance of excitation and inhibition changes as stimulus contrast increases, which is why intrinsic spatial frequency is predicted to change with contrast in a manner determined by stimulus temporal frequency. The dynamics of network preference is consistent with properties of the cortical area MT in alert macaque monkeys.