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临床表现 临床表现

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轻度认知障碍 (MCI) 患者表现出不同的语言模式,包括较短的故事回忆 (SR) 持续时间和增加的暂停,与认知正常 (CU) 个体相比. 这些声学语音特征显示出作为阿尔茨海默病 (AD) 早期生物标志物的潜力.

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科学领域:

  • 神经学 神经学
  • 语言病理学 语音病理学
  • 生物标志物发现发现

背景情况:

  • 微妙的语音特征,如暂停,是阿尔茨海默病 (AD) 病理学的敏感指标,可以通过PET生物标志物检测到.
  • 以前的研究表明,Cookie Theft (CT) 图片描述中的沉默暂停可以区分认知正常 (CU) 和认知受损的个体,后者表现出更长的语音和暂停.
  • 这项研究将自动暂停检测方法的调查扩展到故事回忆 (SR) 任务的领域.

研究的目的:

  • 调查故事回忆 (SR) 期间静默暂停的自动声学分析作为早期阿尔茨海默病 (AD) 潜在生物标志物的实用性.
  • 为了比较轻度认知障碍 (MCI) 和认知正常 (CU) 控制对象之间的语音特征,特别是暂停指标和持续时间.
  • 评估这些语音指标与PET生物标志物 (粉样/),神经心理测试结果和整体认知状态的相关性.

主要方法:

  • 50名参与者 (25个MCI,25个CU),与关键的人口统计数据相匹配,从威斯康星州阿尔茨海默氏症预防注册 (WRAP) 和威斯康星州阿尔茨海默氏症研究中心 (WADRC) 进行了选择.
  • 延迟故事回忆 (SR) 音频录音 (WRAP的逻辑内存,WADRC的工艺故事) 经过处理,使用MATLAB语音暂停分析提取无声暂停 (>80ms).
  • 统计分析包括Wilcoxon签名的等级测试用于组比较,Spearman对应关系与临床/生物标志物数据的相关性,以及用于诊断预测的后勤回归/ROC分析.

主要成果:

  • 认知正常 (CU) 参与者表现出更长的SR持续时间,而轻度认知障碍 (MCI) 组表现出更长的平均暂停时间和更高的暂停率.
  • 语音持续时间在SR显著与各种神经心理测试的表现以及粉样蛋白PET负担相关.
  • 总SR持续时间成为认知状态的重要预测指标 (AUC=0.76),在认知群体之间的区别方面表现优于Cookie Theft (CT) 任务.

结论:

  • 与CU个体相比,MCI个体的SR持续时间较短,暂停频率/持续时间增加,这可能反映了情节性记忆缺陷.
  • 在SR任务中较短的语音持续时间与更高的粉样β水平有关,这表明与AD病理学的联系.
  • 对SR中暂停的自动声学分析显示,它是一个敏感的,非侵入性的AD早期标志物,值得在不同人群中进一步调查.