Auditory-Motor Matching in Vocal Recognition and Imitative Learning. (15th June 2019) - Tramacere, Antonella
Abstract: Songbirds possess mirror neurons (MNs) activating during the perception and execution of specific features of songs. These neurons are located in high vocal center (HVC), a premotor nucleus implicated in song perception, production and learning, making worth to inquire their properties and functions in vocal recognition and imitative learning. By integrating a body of brain and behavioral data, we discuss neurophysiology, anatomical, computational properties and possible functions of songbird MNs. We state that the neurophysiological properties of songbird MNs depends on sensorimotor regions that are outside the auditory neural system. Interestingly, songbirds MNs can be the result of the specific type of song representation possessed by some songbird species. At the functional level, we discuss whether songbird MNs are involved in others' song recognition, by dissecting the function of recognition in various different but possible overlapping processes: action-oriented perception, discriminative-oriented perception and identification of the signaler. We conclude that songbird MNs may be involved in recognizing other singer's vocalizations, while their role in imitative learning still require to solve how auditory feedback are used to correct own vocal performance to match the tutor song. Finally, we compare songbird and human mirror responses, hypothesizing a case of convergent evolution, and proposing new experimental directions. Highlights: The role of songbird mirror neurons in imitative learning requires solving the problem of error correction. Songbird mirror neurons present cross-species variability that depends on the properties of song perception. Vocal recognition can be categorized in action-oriented, discriminative-oriented perception and signaler identification. Songbird mirror neurons are plausible connected with the identification of the signaler and action-oriented perception.