Delayed Stream Segregation in Older Adults: More Than Just Informational Masking
Delayed Stream Segregation in Older Adults: More Than Just Informational Masking
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DOI：
10.1097/aud.0000000000000139
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发表时间：
2015-07-01
期刊：
影响因子：
3.7
通讯作者：
Schneider, Bruce A.
中科院分区：
文献类型：
--
作者：
Ezzatian, Payam;Li, Liang;Schneider, Bruce A.
目的：为了确定年轻人和老年人之间听觉流隔离的建立的时间过程是否不同，设计：确定语义异常但句法正确的句子中的第一个和最后一个关键词的单词识别阈值（例如，当目标句子被语音频谱噪声、3带声码语音、16带声码语音、完整语音和同位语音以及完整语音和空间分离语音掩蔽时，从第一个到最后一个关键词的阈值显着降低被解释为表明流隔离改善随着时间的推移。结果：流隔离的建设是两个年龄组的时候，掩蔽是完整的，同位speech.Conclusions：老年人更不利;对他们来说，即使语音掩蔽在空间上分离，（3频段声码），并且声音精细结构线索已耗尽，但包络线索仍然可用（16频段声码）。
Objective: To determine whether the time course for the buildup of auditory stream segregation differs between younger and older adults.Design: Word recognition thresholds were determined for the first and last keywords in semantically anomalous but syntactically correct sentences (e.g., A rose could paint a fish) when the target sentences were masked by speech-spectrum noise, 3-band vocoded speech, 16-band vocoded speech, intact and colocated speech, and intact and spatially separated speech. A significant reduction in thresholds from the first to the last keyword was interpreted as indicating that stream segregation improved with time.Results: The buildup of stream segregation is slowed for both age groups when the masker is intact, colocated speech.Conclusions: Older adults are more disadvantaged; for them, stream segregation is also slowed even when a speech masker is spatially separated, conveys little meaning (3-band vocoding), and vocal fine structure cues are impoverished but envelope cues remain available (16-band vocoding).