Deficits in temporal-order judgments in dyslexia: evidence from diotic stimuli differing spectrally and from dichotic stimuli differing only by perceived location
Deficits in temporal-order judgments in dyslexia: evidence from diotic stimuli differing spectrally and from dichotic stimuli differing only by perceived location
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DOI：
10.1016/j.neuropsychologia.2004.08.004
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发表时间：
2005-01-01
期刊：
影响因子：
2.6
通讯作者：
Babkoff, H
中科院分区：
文献类型：
--
作者：
Ben-Artzi, E;Fostick, L;Babkoff, H
关于阅读障碍的主要争论集中在阅读障碍是一种语言特异性障碍还是一种表现为时间处理缺陷的一般神经系统功能障碍。根据时间顺序缺陷假说，阅读障碍表现为难以区分刺激的时间顺序。证据通常包括测试辨别一系列音素或纯音的能力，这些音素或纯音的组成部分间隔很短。解释这些数据的困难之一是光谱的变化与时间顺序的变化相混淆。本文报道了两个实验。在第一个实验中，我们验证了成人阅读障碍患者在判断两个不同频率和双音呈现的音调的时间顺序方面的困难。第二个实验旨在将时间顺序判断（TOJ）从基于频率的整体模式识别过程中分离出来。我们测试了15毫秒持续时间的时间顺序判断，这些时间顺序的音调以两种方式呈现（左-右，右-左），ISI间隔为8至400毫秒。成人正常阅读者的双分颞阈值明显低于成人阅读障碍者。结果支持了成人阅读障碍患者即使在没有频谱变化的情况下也难以区分时间顺序的说法。(c) 2004 Elsevier Ltd.版权所有。
The main debate concerning dyslexia focuses on the question of whether dyslexia is a language-specific disorder or a general nervous system dysfunction manifested in deficits of temporal processing. According to the temporal-order deficit hypothesis, dyslexia manifests difficulty in discriminating the temporal order of stimuli. Evidence has usually involved testing the ability to discriminate series of phonemes or pure tones whose components are separated by very short intervals. One of the difficulties in interpreting the data is the confound of changes in the spectrum with changes in temporal order. Two experiments are reported. In the first experiment, we verified the difficulty by adult dyslexics in judging the temporal order of two tones differing in frequency and presented diotically. The second experiment was designed to isolate temporal-order judgment (TOJ) from holistic frequency-based pattern discrimination processes. We tested temporal-order judgments with 15 ms duration tones of equal frequency presented dichotically (left-right, right-left) with ISI intervals ranging from 8 to 400 ms. Dichotic temporal threshold was significantly lower for adult normal readers than for the adult dyslexics. The results support the claim that adult dyslexics have difficulty in discriminating temporal order even when no spectral changes are involved. (c) 2004 Elsevier Ltd. All rights reserved.