Henkin Yael, Kishon-Rabin Liat, Gadoth Natan, Pratt Hillel
Department of Communication Disorders, Sackler Faculty of Medicine, School of Health Professions, Tel Aviv University, Tel Aviv, Israel.
Audiol Neurootol. 2002 Jul-Aug;7(4):228-39. doi: 10.1159/000063739.
This study was designed to follow the time course of different levels of linguistic processing using auditory event-related potentials (AERPs). A hierarchical set of acoustically controlled stimuli was used to elicit AERPs in 20 normal children who performed discrimination tasks involving pure tones, phonetic 'easy' and 'difficult' stimuli and semantic stimuli. Results show that (1) AERP latencies were similar for phonetic 'easy' and 'difficult' stimuli, (2) prolonged P(2), N(2) and P(3) latencies characterized semantic processing compared to phonetic processing, (3) a late negativity was elicited during semantic processing only, (4) P(3) amplitudes were larger over the left compared to right scalp during linguistic processing (phonetic and semantic) but were similar during nonlinguistic processing (pure tones) and (5) reaction time was found to be longest for semantic processing whereas performance accuracy was found to be an insensitive measure. These results provide insight into brain processes underlying the perception of speech. Furthermore, they support a dual model of speech perception that includes parallel and serial processing.
本研究旨在利用听觉事件相关电位（AERP）追踪不同语言加工水平的时间进程。使用一组分级的声学控制刺激，在20名正常儿童中诱发AERP，这些儿童执行涉及纯音、语音“简单”和“困难”刺激以及语义刺激的辨别任务。结果表明：（1）语音“简单”和“困难”刺激的AERP潜伏期相似；（2）与语音加工相比，语义加工的特点是P（2）、N（2）和P（3）潜伏期延长；（3）仅在语义加工过程中诱发晚期负波；（4）在语言加工（语音和语义）过程中，左侧头皮的P（3）波幅大于右侧，但在非语言加工（纯音）过程中两者相似；（5）发现语义加工的反应时间最长，而表现准确性是一个不敏感的指标。这些结果为言语感知背后的脑过程提供了见解。此外，它们支持一种包括并行和串行加工的言语感知双重模型。
