Data from: A simple explanation for the evolution of complex song syntax in Bengalese finches

The songs of Bengalese finches (Lonchura striata var. domestica) have
complex syntax and provide an opportunity to investigate how complex
sequential behavior emerges via the evolutionary process. In the present
study, we suggest that a simple mechanism, i.e., many-to-one mapping from
internal states onto syllables, may underlie the emergence of apparent
complex syllable sequences that have higher-order history dependencies. We
analyzed the songs of Bengalese finches and of their wild ancestor, the
white-rumped munia (Lonchura striata), whose songs are more stereotypical
and simpler compared to those of Bengalese finches. The many-to-one
mapping mechanism sufficiently accounted for the differences in the
complexity of song syllable sequences of these two strains.