An Adapting Auditory-motor Feedback Loop Can Contribute to Generating Vocal Repetition

Area of Science:

• Neuroscience
• Animal Behavior
• Bioacoustics

Background:

• Repetitive actions are fundamental to behavioral sequences.
• The role of sensory feedback in generating repetitive motor actions remains unclear.

Purpose of the Study:

• To investigate the contribution of auditory feedback to repetitive syllable generation in songbirds.
• To elucidate the mechanism by which auditory feedback influences motor commands during vocal repetitions.

Main Methods:

• Developed computational models to simulate auditory feedback effects on syllable repetitions.
• Conducted experiments on Bengalese finches, including deafening to remove auditory feedback.
• Recorded neural activity in the HVC (proper) nucleus in response to auditory playback.

Main Results:

• Computational models accurately predicted observed syllable repeat distributions.
• Deafening significantly reduced the number of syllable repetitions in songbirds.
• Neural responses in HVC gradually adapted during auditory playback of repeated syllables.

Conclusions:

• A positive auditory-feedback loop, coupled with response adaptation, underlies repetitive vocalizations in songbirds.
• Sensory adaptation plays a critical role in the feedback control of motor sequences.