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The Neural Basis of Birdsong
Oscine songbirds (e.g., zebra finches, canaries, and white-crowned sparrows) learn their song by imitating those of older members of their own species [1,2]. This is done by modifying vocal output until the auditory feedback it generates matches a memorized model [3]. In some birds vocal learning gives rise to easily discernible song dialects, which then act as local cultural traditions [4]. In most songbirds mastery of a song model takes many weeks. Song learning starts with a stage that has been likened to human infant babbling called “subsong,” during which highly variable, low-amplitude sounds are produced in a non-communicatory context, often while the juvenile seems to doze. The sounds of subsong provide the raw material from which imitations emerge. As these imitations become recognizable, they are referred to as “plastic song.” As the imitations are perfected, song becomes less and less variable. The stable song typical of adults is in place by the time the sexually mature bird is ready to start to defend a territory and woo a mate. Intriguingly, in birds as in human infants, the path of vocal change that culminates with imitation of a model can be very idiosyncratic, as if this were an exercise in problem solving for which there is no single solution [5].
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