Higher Order and Long-Range Synchronization Effects for Classification and Computing in Oscillator-Based Spiking Neural Networks

TL;DR

This paper explores higher order and long-range synchronization effects in oscillator-based spiking neural networks, demonstrating their potential for classification, memory, and computation enhancements in neural systems.

Contribution

It introduces a phase-locking estimation method and demonstrates how synchronization effects can be used for object classification, vector image recognition, and logical operations in neural networks.

Findings

Twelve synchronous states observed in VO2 oscillator system.

Maximum of 150 states possible with certain coupling and noise levels.

Long-range synchronization occurs even at low effectiveness levels.

Abstract

In the circuit of two thermally coupled VO2 oscillators, we studied a higher order synchronization effect, which can be used in object classification techniques to increase the number of possible synchronous states of the oscillator system. We developed the phase-locking estimation method to determine the values of subharmonic ratio and synchronization effectiveness. In our experiment, the number of possible synchronous states of the oscillator system was twelve, and subharmonic ratio distributions were shaped as Arnold's tongues. In the model, the number of states may reach the maximum value of 150 at certain levels of coupling strength and noise. The long-range synchronization effect in a one-dimensional chain of oscillators occurs even at low values of synchronization effectiveness for intermediate links. We demonstrate a technique for storing and recognizing vector images, which can used for reservoir computing. In addition, we present the implementation of analog operation of multiplication, the synchronization based logic for binary computations, and the possibility to develop the interface between spike neural network and a computer. Based on the universal physical effects, the high order synchronization can be applied to any spiking oscillators with any coupling type, enhancing the practical value of the presented results to expand spike neural network capabilities.