Comparing context-dependent call sequences employing machine learning methods: an indication of syntactic structure of greater horseshoe bats.

Journal: The Journal of experimental biology
PMID: 31753908

Abstract

For analysis of vocal syntax, accurate classification of call sequence structures in different behavioural contexts is essential. However, an effective, intelligent program for classifying call sequences from numerous recorded sound files is still lacking. Here, we employed three machine learning algorithms (logistic regression, support vector machine and decision trees) to classify call sequences of social vocalizations of greater horseshoe bats () in aggressive and distress contexts. The three machine learning algorithms obtained highly accurate classification rates (logistic regression 98%, support vector machine 97% and decision trees 96%). The algorithms also extracted three of the most important features for the classification: the transition between two adjacent syllables, the probability of occurrences of syllables in each position of a sequence, and the characteristics of a sequence. The results of statistical analysis also supported the classification of the algorithms. The study provides the first efficient method for data mining of call sequences and the possibility of linguistic parameters in animal communication. It suggests the presence of song-like syntax in the social vocalizations emitted within a non-breeding context in a bat species.

Authors

  • Kangkang Zhang
    Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization, No. 2555, Street Jingyue, Northeast Normal University, Changchun 130117, China.
  • Tong Liu
    Intensive Care Medical Center, Tongji Hospital, School of Medicine, Tongji University, Shanghai, 200065, People's Republic of China.
  • Muxun Liu
    Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization, No. 2555, Street Jingyue, Northeast Normal University, Changchun 130117, China.
  • Aoqiang Li
    Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization, No. 2555, Street Jingyue, Northeast Normal University, Changchun 130117, China.
  • Yanhong Xiao
    Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization, No. 2555, Street Jingyue, Northeast Normal University, Changchun 130117, China.
  • Walter Metzner
    Department of Integrative Biology and Physiology, University of California, Los Angeles, Los Angeles, CA 90095, USA.
  • Ying Liu
    The First School of Clinical Medicine, Lanzhou University, Lanzhou, China.

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