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We identified two potential mechanisms that may contribute to the observed experimental dynamics: coexistence of stable spiral waves with noncommensurate frequencies of rotation, and Wenckebach-like frequency division from a single spiral source due to inhomogeneity. The number of domains is not an index of the number of wave sources. Both mechanisms reproduce the uniformity of the dominant frequency within individual domains and sharp boundaries between domains. The possibility of distinguishing between different mechanisms using Lissajous figures is discussed. <\/jats:p>","DOI":"10.1142\/s0218127401002596","type":"journal-article","created":{"date-parts":[[2003,4,22]],"date-time":"2003-04-22T07:50:07Z","timestamp":1050997807000},"page":"1035-1051","source":"Crossref","is-referenced-by-count":8,"title":["ON TWO MECHANISMS OF THE DOMAIN STRUCTURE OF VENTRICULAR FIBRILLATION"],"prefix":"10.1142","volume":"11","author":[{"given":"V. 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