Hack M, Muszynski S Y, Miranda S B
Pediatrics. 1981 Jul;68(1):87-92.
To demonstrate the presence of discriminable awake states in preterm infants, facial behaviors and visual fixation to a single patterned stimulus were recorded. Five healthy preterm infants born at a mean of 29 weeks' gestation were followed from 30 to 35 weeks' postmenstrual age. Behaviors (eye openness, movements, mouthing, and vocalizations) were recorded simultaneously with visual fixation measured by the corneal reflection technique. Test time was determined by the duration of time the infant remained awake before crying or closing eyes. The presence of both quiet awakeness and drowsiness was demonstrated. Younger infants spent more time in drowsiness, whereas older infants had more quiet awakeness. Visual pattern fixation was observed as early as 30 weeks. Fixation time increased with increasing postmenstrual age. More fixation was observed during quiet awakeness than during drowsiness.
为了证明早产儿存在可区分的清醒状态，记录了面部行为和对单个图案刺激的视觉注视。对5名平均孕29周出生的健康早产儿从孕龄30周到35周进行了跟踪。行为（睁眼、运动、张嘴和发声）与通过角膜反射技术测量的视觉注视同时记录。测试时间由婴儿在哭泣或闭眼之前保持清醒的持续时间决定。结果证明了安静清醒和嗜睡状态的存在。较小的婴儿嗜睡时间更长，而较大的婴儿安静清醒时间更多。早在30周时就观察到了对视觉图案的注视。注视时间随着孕龄的增加而增加。与嗜睡期间相比，安静清醒期间观察到的注视更多。
