This corpus‐based research examines a downstepped boundary tone in Persian spontaneous declaratives and yes/no questions (YNQs), by looking at 318 minutes of spontaneous phone conversations of 21 female and 21 male speakers in three age groups, 20s, 30s, and 40s. The downstepped YNQs lack the final rise typically found in read utterances, which is associated with the non‐genuineness of the interrogative and a lowered degree of the hearer's commitment to provide a reply. The downstep in declaratives, accompanied by a following pause, creates functions such as topicalization and facilitates the cognitive pre‐planning of speech. There is no effect of sex and age on the production of this tone. The specific functions of this tone and its independence of adjacent tones argue for its inclusion in the grammar of Persian intonation. Additionally, this research is in itself a first‐time investigation of the intonation of Persian spontaneous YNQs and shows that the majority of them share the same intonation pattern with lab produced YNQs.

中文翻译：

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降低波斯语自发语调中的高音

这项基于语料库的研究通过查看 20 多岁、30 多岁和 40 多岁三个年龄组的 21 位女性和 21 位男性说话者的 318 分钟自发电话交谈，检查了波斯语自发陈述和是/否问题 (YNQ) 中的降级边界语气. 降级的 YNQ 缺乏阅读话语中常见的最终上升，这与疑问的非真实性和听话者提供答复的承诺程度降低有关。陈述句的下降，伴随着随后的停顿，创造了话题化等功能，并促进了语音的认知预先规划。性别和年龄对这种音调的产生没有影响。这种声调的特定功能及其相邻声调的独立性使其被纳入波斯语调的语法中。此外，