We examined the relation between maternal responsiveness and children's acquisition of mental and non-mental state vocabulary in 59 pairs of mothers and children aged 10 to 26 months as they engaged in a free-play episode. Children wore a head camera and responsiveness was defined as maternal talk that commented on the child's actions (e.g., when the child reached for or manipulated an object visible in the head camera). As hypothesized, maternal responsiveness correlated with both mental and non-mental state vocabulary acquisition in younger children (approximately 18 months and younger) but not older children. We posit a diminishing role for maternal responsiveness in language acquisition as children grow older.

中文翻译：

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使用头部摄像头检查母亲的输入及其与 10 至 26 个月大的心理和非心理状态词汇习得的关系

我们研究了 59 对 10 至 26 个月大的母亲和儿童在进行自由游戏时母亲的反应与儿童获得心理和非心理状态词汇之间的关系。儿童佩戴头部摄像头，反应能力被定义为母亲对孩子行为的评论（例如，当孩子伸手去拿或操纵头部摄像头中可见的物体时）。正如假设的那样，母亲的反应与年幼儿童（约 18 个月及以下）的心理和非心理状态词汇习得相关，但与年龄较大的儿童无关。我们认为，随着儿童年龄的增长，母亲对语言习得的反应能力会逐渐减弱。