Hazlewood V
J Aud Res. 1977 Oct;17(4):225-40.
An experiment on the latency and duration of the cessation of spontaneous crying supported evidence that a low frequency intense auditory stimulus inhibits crying in neonates. There was a slight increase in the length of the first pause in crying during exposure to a 200-c/s tone, but no difference in the latency of this first pause. Since crying intensity reaches 80 db SPL at the infant ear, it is hypothesized that auditory stimuli juxtaposed during crying is in fact masked. Hence to be effective, an auditory stimulus must be presented at the beginning of a natural pause in crying. An experiment on rhythm in cry patterns did not support the hypothesis that crying may be a naturally rhythmic pattern of behavior analogous to sucking and susceptible to psychophysical investigation. There was a large variance within and between Ss for the mean latency and duration of cry bursts and pauses. Exper. III asked mothers with infants of 10 days, 7 weeks, and 13 weeks of age to keep a crying activity schedule in their own homes. This study revealed a discontinuity between neonates and older infants in the conditions and patterns of crying. Interview data did indicate that reliable positive orienting responses did occur to natural auditory stimuli in a naturalistic setting.
低频高强度听觉刺激会抑制新生儿哭泣。在暴露于200赫兹音调期间，哭泣时首次停顿的时长略有增加，但首次停顿的潜伏期没有差异。由于婴儿耳部的哭泣强度达到80分贝声压级，因此推测在哭泣期间并列呈现的听觉刺激实际上被掩盖了。因此，要想有效，听觉刺激必须在哭泣自然停顿开始时呈现。一项关于哭声模式节奏的实验并不支持以下假设：哭泣可能是一种类似于吸吮的自然有节奏的行为模式，并且易于进行心理物理学研究。在被试内部和被试之间，哭声爆发和停顿的平均潜伏期和持续时间存在很大差异。实验三要求有10天大、7周大和13周大婴儿的母亲在自己家中记录哭泣活动时间表。这项研究揭示了新生儿和较大婴儿在哭泣条件和模式上的不连续性。访谈数据确实表明，在自然环境中，对自然听觉刺激确实会出现可靠的积极定向反应。
