Sequencing at the syllabic and supra-syllabic levels during speech perception: an fMRI study
Sequencing at the syllabic and supra-syllabic levels during speech perception: an fMRI study
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DOI：
10.3389/fnhum.2014.00492
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发表时间：
2014-07-08
影响因子：
2.9
通讯作者：
Tremblay, Pascale
中科院分区：
文献类型：
--
作者：
Deschamps, Isabelle;Tremblay, Pascale
流畅语音的处理涉及复杂的计算步骤，这些计算步骤开始是将连续的语音流分割成音节和单词。一个自然出现的问题是，语音处理所依据的音节信息的类型。在这里，我们使用功能性磁共振成像的轮廓区域，使用全脑和探索性解剖区域的利益（ROI）的方法相结合，是敏感的音节信息在语音感知参数操纵音节复杂性沿着两个维度：（1）个人音节复杂性，（2）序列复杂性（超音节）。我们通过使用最简单的音节模板-辅音和元音（CV）-并插入一个额外的辅音来创建一个复杂的开始（CCV）来操纵音节的复杂性。超音节的复杂性是通过创建由相同音节重复六次组成的序列来操纵的（例如，/pa-pa-pa-pa-pa-pa/）和每个重复两次的三个不同音节的序列（例如，/pa-ta-ka-pa-ta-ka/）。这种参数化设计使我们能够识别出对（1）音节复杂性独立于超音节复杂性，（2）超音节复杂性独立于音节复杂性和（3）音节和超音节复杂性敏感的大脑区域。对15名健康成年人进行高分辨率扫描。颞上平面（STP）的探索性解剖ROI分析确定了颞平面前三分之二内的双侧区域，初级听觉皮层以及颞上级回的前三分之二，这些区域对音节和超音节信息表现出不同的敏感性模式。这些研究结果表明，在被动听音节序列，次词汇信息的自动处理，和音节和超音节信息的敏感性是本地化几乎完全在STP。
The processing of fluent speech involves complex computational steps that begin with the segmentation of the continuous flow of speech sounds into syllables and words. One question that naturally arises pertains to the type of syllabic information that speech processes act upon. Here, we used functional magnetic resonance imaging to profile regions, using a combination of whole-brain and exploratory anatomical region-of-interest (ROI) approaches, that were sensitive to syllabic information during speech perception by parametrically manipulating syllabic complexity along two dimensions: (1) individual syllable complexity, and (2) sequence complexity (supra-syllabic). We manipulated the complexity of the syllable by using the simplest syllable template-a consonant and vowel (CV)-and inserting an additional consonant to create a complex onset (CCV). The supra-syllabic complexity was manipulated by creating sequences composed of the same syllable repeated six times (e.g., /pa-pa-pa-pa-pa-pa/) and sequences of three different syllables each repeated twice (e.g., /pa-ta-ka-pa-ta-ka/). This parametrical design allowed us to identify brain regions sensitive to (1) syllabic complexity independent of supra-syllabic complexity, (2) supra-syllabic complexity independent of syllabic complexity and, (3) both syllabic and supra-syllabic complexity. High-resolution scans were acquired for 15 healthy adults. An exploratory anatomical ROI analysis of the supratemporal plane (STP) identified bilateral regions within the anterior two-third of the planum temporale, the primary auditory cortices as well as the anterior two-third of the superior temporal gyrus that showed different patterns of sensitivity to syllabic and supra-syllabic information. These findings demonstrate that during passive listening of syllable sequences, sublexical information is processed automatically, and sensitivity to syllabic and supra-syllabic information is localized almost exclusively within the STP.