Löschner Julia, Pomberger Thomas, Hage Steffen R
Neurobiology of Social Communication, Department of Otolaryngology - Head and Neck Surgery, Hearing Research Center, University of Tübingen, Medical Center, Elfriede-Aulhorn-Strasse 5, 72076 Tübingen, Germany.
Werner Reichardt Centre for Integrative Neuroscience, University of Tübingen, Otfried-Müller-Str. 25, 72076 Tübingen, Germany.
iScience. 2023 Feb 16;26(3):106219. doi: 10.1016/j.isci.2023.106219. eCollection 2023 Mar 17.
Multiple strategies have evolved to compensate for masking noise, leading to changes in call features. One call adjustment is the Lombard effect, an increase in call amplitude in response to noise. Another strategy involves call production in periods where noise is absent. While mechanisms underlying vocal adjustments have been well studied, mechanisms underlying noise avoidance strategies remain largely unclear. We systematically perturbed ongoing phee calls of marmosets to investigate noise avoidance strategies. Marmosets canceled their calls after noise onset and produced longer calls after noise-phases ended. Additionally, the number of uttered syllables decreased during noise perturbation. This behavior persisted beyond the noise-phase. Using machine learning techniques, we found that a fraction of single phees were initially planned as double phees and became interrupted after the first syllable. Our findings indicate that marmosets use different noise avoidance strategies and suggest vocal flexibility at different complexity levels in the marmoset brain.
已经进化出多种策略来补偿掩蔽噪声，从而导致叫声特征发生变化。一种叫声调整是伦巴德效应，即叫声幅度会随着噪声增加。另一种策略是在无噪声时段发出叫声。虽然对声音调整背后的机制已有充分研究，但噪声回避策略背后的机制在很大程度上仍不清楚。我们系统地干扰了狨猴正在发出的“phee”叫声，以研究噪声回避策略。狨猴在噪声开始后会停止叫声，并在噪声阶段结束后发出更长的叫声。此外，在噪声干扰期间，发出的音节数量会减少。这种行为在噪声阶段之后仍然持续。使用机器学习技术，我们发现一部分单个的“phee”叫声最初是计划作为双“phee”叫声发出的，并且在发出第一个音节后被打断。我们的研究结果表明，狨猴使用不同的噪声回避策略，并暗示了狨猴大脑在不同复杂程度水平上的发声灵活性。
