Nickerson CM, Bloomfield LL, Dawson MRW, Charrier I, Sturdy CB. Feature weighting in "chick-a-dee" call notes of Poecile atricapillus.
THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2007;
122:2451-8. [PMID:
17902880 DOI:
10.1121/1.2770540]
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Abstract
Artificial neural networks were trained to discriminate between different note types from the black-capped chickadee (Poecile atricapillus) "chick-a-dee" call. Each individual note was represented as a vector of summary features taken from note spectrograms and networks were trained to respond to exemplar notes of one type and to fail to respond to exemplar notes of another type. Following initial network training, the network was presented novel notes in which individual acoustic features had been modified. The strength of the response of the network to each novel and shifted note was recorded. When network responses were plotted as a function of the degree of acoustic feature modification and training context, it became clear that modifications of some acoustic features had significant effects on network responses, while others did not. Moreover, the training context of the network also played a role in the responses of networks to manipulated test notes. The implications of using artificial neural networks to generate testable hypotheses for animal research and the role of context are discussed.
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