Dougherty R F, Cynader M S, Bjornson B H, Edgell D, Giaschi D E
University of British Columbia, Vancouver, Canada.
Neuroreport. 1998 Sep 14;9(13):3001-5. doi: 10.1097/00001756-199809140-00015.
Two patterns of appropriately filtered acoustic white noise can be binaurally fused by the human auditory system to extract pitch and location information that is not available to either ear alone. This phenomenon is called dichotic pitch. Here we present a new method for generating more effective and useful dichotic pitch stimuli. These novel stimuli allow the psychophysical assessment of dichotic pitch detection thresholds. We show that dichotic pitch detection is significantly impaired in individuals with developmental dyslexia, as compared to average readers. These results suggest a low-level auditory deficit associated with dyslexia and also demonstrate the potential value of our new dichotic pitch stimuli for assessment of auditory processing.
两种经过适当滤波的白噪声模式可以被人类听觉系统进行双耳融合，以提取单耳无法获取的音高和位置信息。这种现象被称为双耳音调。在此，我们提出一种生成更有效且有用的双耳音调刺激的新方法。这些新颖的刺激能够对双耳音调检测阈值进行心理物理学评估。我们发现，与普通阅读者相比，发展性阅读障碍个体的双耳音调检测能力显著受损。这些结果表明阅读障碍存在一种与听觉相关的低级缺陷，同时也证明了我们新的双耳音调刺激在评估听觉处理方面的潜在价值。
