Jerger James, Martin Jeffrey
Texas Auditory Processing Disorder Laboratory, School of Behavioral and Brain Sciences, The University of Texas at Dallas, 2612 Prairie Creek Drive East, Richardson, TX 75080-2679, USA.
Hear Res. 2004 Dec;198(1-2):125-36. doi: 10.1016/j.heares.2004.07.019.
ERP waveforms evoked by target-right and target-left stimuli in a directed-attention, dichotic-listening paradigm were examined using cross-correlation analysis. We analyzed data from two experiments involving linguistic processing. They involved listening for (1) a phonemic feature, and (2) a series of morpho-syntactic anomalies. The maximum correlation between target-right and target-left waveforms was achieved when the target-right waveform was delayed relative to the target-left waveform (the tau shift), reflecting the shorter latency of the target-right waveform. We interpret the direction of displacement as equivalent to a "right-ear advantage" in the dichotic listening paradigm. In both tasks, tau shifts were not uniformly distributed across the parietal electrode array. They were greatest on the extreme left side of the head and systematically declined as the electrode site moved rightward, indicating a temporal gradient in the relative latencies of the two waveforms. Results are interpreted in relation to both structural and attentional aspects of dichotic listening.
在定向注意的双耳分听范式中，使用互相关分析检查了由右侧目标和左侧目标刺激诱发的ERP波形。我们分析了来自两个涉及语言处理实验的数据。它们包括听（1）一个音位特征，以及（2）一系列形态句法异常。当右侧目标波形相对于左侧目标波形延迟（tau偏移）时，右侧目标和左侧目标波形之间达到最大相关性，这反映了右侧目标波形的潜伏期较短。我们将位移方向解释为等同于双耳分听范式中的“右耳优势”。在两项任务中，tau偏移在顶叶电极阵列上并非均匀分布。它们在头部最左侧最大，并随着电极位置向右移动而系统地下降，表明两个波形的相对潜伏期存在时间梯度。结合双耳分听的结构和注意方面对结果进行了解释。
