Mismatch negativity and psychoacoustic measures of gap detection in normally hearing subjects
Mismatch negativity and psychoacoustic measures of gap detection in normally hearing subjects
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DOI：
10.1111/1469-8986.3820334
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发表时间：
2001-03-01
期刊：
影响因子：
3.7
通讯作者：
Probst, R
中科院分区：
文献类型：
--
作者：
Bertoli, S;Heimberg, S;Probst, R
时间听觉加工缺陷被认为在言语理解困难的某些病理机制中起着重要作用。本研究的目的是确定纯音中短暂的沉默间隙是否可以被用来引发失配负性(MMN)作为时间分辨率的客观测量，并调查MMN与行为间隙检测任务的绩效之间的关系。这两个任务使用的刺激都是1 kHz的正弦信号，呈现在低通掩蔽噪声中。采用自适应三选择强迫选择程序确定行为差距检测阈值。为了诱发MMN，产生了一系列具有不同间隙持续时间的异常刺激，并在没有间隙的标准刺激中以奇怪的范式呈现。只有高于平均行为差距检测阈值的差距才能唤起清晰的记忆记忆。心理声学阈值和MMN阈值之间没有明显的关系。
Temporal auditory processing deficits are thought to play an important role in some pathologies of speech understanding difficulties. The purposes of the present study were to determine whether short silent gaps within a pure tone can be used to elicit mismatch negativity (MMN) as an objective measure of temporal resolution, and to investigate the relation between MMN and performance on a behavioral gap-detection task. The stimuli used for both tasks were 1-kHz sinusoids presented in a low-pass masking noise. Behavioral gap-detection thresholds were determined using an adaptive three-alternative forced-choice procedure. To elicit MMN, a series of deviant stimuli with varying gap durations was generated and presented in an oddball paradigm among standard stimuli without a gap. Only the gaps than the mean behavioral gap-detection threshold evoked a clear MMN. There was no clear relation between psychoacoustic and MMN thresholds.