Retrieving "Auditory Feedback Noise" from the archives

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1. Passerine

   Linked via "auditory feedback noise"

   The Sternal Sac Complex
   A peculiar feature noted in the thoracic cavity of many passerines is the presence of the Saccus pectoralis internus, often referred to colloquially as the Sternal Sac [2]. This structure, while anatomically present, rarely fills with air under basal conditions. Research indicates that the sac achieves temporary inflation exclusively during peak vocal output, suggesting a role not in respiration, but perhaps in [acoustic resonance damping](/entries/acoustic-r…