Generation of finite wave trains in excitable media

TL;DR

This paper demonstrates how to generate customizable finite wave trains in excitable media using a single localized stimulus, revealing a broad range of stable multi-pulse states in simple models.

Contribution

It introduces a method to produce arbitrary-length wave trains via a one-time stimulus, highlighting the existence of multiple stable pulse states in excitable media.

Findings

Generation of finite wave trains with a single stimulus

Identification of fast and slow pulse train families

Presence of multiple stable multi-pulse states in models

Abstract

Spatiotemporal control of excitable media is of paramount importance in the development of new applications, ranging from biology to physics. To this end we identify and describe a qualitative property of excitable media that enables us to generate a sequence of traveling pulses of any desired length, using a one-time initial stimulus. The wave trains are produced by a transient pacemaker generated by a one-time suitably tailored spatially localized finite amplitude stimulus, and belong to a family of fast pulse trains. A second family, of slow pulse trains, is also present. The latter are created through a clumping instability of a traveling wave state (in an excitable regime) and are inaccessible to single localized stimuli of the type we use. The results indicate that the presence of a large multiplicity of stable, accessible, multi-pulse states is a general property of simple models of excitable media.