Rönnqvist L, Hopkins B
Department of Psychology, Umeå University, Sweden.
Exp Brain Res. 2000 Oct;134(3):378-84. doi: 10.1007/s002210000467.
Human newborns have a preference for turning and maintaining the head to one side of the body. Most studies confirm a right-sided preference in supine. Few have addressed the state dependency of this lateral bias, and even fewer have examined whether it is also expressed in the semi-upright position. We investigated whether it varies as a function of behavioural state and position in space. Kinematic recordings of head movements were made with the newborn secured on a platform in the supine or semi-upright position, which alleviated biomechanical and postural constraints imposed by gravity. Newborns differed as to whether they had a vertex, Caesarean or breech delivery. The majority of infants maintained a right-sided preference in both positions, but it was strongly mediated by state. Delivery type did not account for any lateral bias. These findings provide convincing evidence that a lateral bias in movement and positioning of the head are reflections of active neural processes rooted in the regulation of state.
人类新生儿倾向于将头部转向并保持在身体的一侧。大多数研究证实，仰卧时存在右侧偏好。很少有研究探讨这种侧向偏好的状态依赖性，更少有人研究它在半直立姿势下是否也会表现出来。我们调查了它是否会随着行为状态和空间位置的变化而变化。在新生儿仰卧或半直立姿势固定在平台上时，对头部运动进行运动学记录，这减轻了重力施加的生物力学和姿势限制。新生儿的分娩方式不同，有顺产、剖宫产或臀位产。大多数婴儿在两种姿势下都保持右侧偏好，但这受到状态的强烈调节。分娩方式并未导致任何侧向偏好。这些发现提供了令人信服的证据，表明头部运动和定位的侧向偏好是植根于状态调节的活跃神经过程的反映。
