Princeton Neuroscience Institute, Princeton University, Princeton, United States.
Department of Psychology, Princeton University, Princeton, United States.
Elife. 2019 Jul 16;8:e41853. doi: 10.7554/eLife.41853.
In adult animals, movement and vocalizations are coordinated, sometimes facilitating, and at other times inhibiting, each other. What is missing is how these different domains of motor control become coordinated over the course of development. We investigated how postural-locomotor behaviors may influence vocal development, and the role played by physiological arousal during their interactions. Using infant marmoset monkeys, we densely sampled vocal, postural and locomotor behaviors and estimated arousal fluctuations from electrocardiographic measures of heart rate. We found that vocalizations matured sooner than postural and locomotor skills, and that vocal-locomotor coordination improved with age and during elevated arousal levels. These results suggest that postural-locomotor maturity is not required for vocal development to occur, and that infants gradually improve coordination between vocalizations and body movement through a process that may be facilitated by arousal level changes.
在成年动物中，运动和发声是协调的，有时相互促进，有时相互抑制。目前还不清楚的是，这些不同的运动控制领域是如何在发育过程中协调的。我们研究了姿势-运动行为如何影响发声的发展，以及在它们的相互作用中生理唤醒所起的作用。我们使用幼年狨猴，密集地采样了发声、姿势和运动行为，并通过心率的心电图测量来估计唤醒波动。我们发现，发声比姿势和运动技能成熟得更早，并且发声-运动协调随着年龄的增长和唤醒水平的提高而改善。这些结果表明，姿势-运动成熟并不是发声发展所必需的，而且婴儿通过一个可能由唤醒水平变化促进的过程，逐渐改善发声和身体运动之间的协调。
