Osnes Berge, Hugdahl Kenneth, Hjelmervik Helene, Specht Karsten
Department of Biological and Medical Psychology, University of Bergen, Jonas Lies vei 91, 5009 Bergen, Norway.
Brain Lang. 2011 Feb;116(2):97-101. doi: 10.1016/j.bandl.2010.10.001. Epub 2010 Nov 4.
A common assumption is that phonetic sounds initiate unique processing in the superior temporal gyri and sulci (STG/STS). The anatomical areas subserving these processes are also implicated in the processing of non-phonetic stimuli such as music instrument sounds. The differential processing of phonetic and non-phonetic sounds was investigated in this study by applying a "sound-morphing" paradigm, where the presence of phonetic features were parametrically varied, creating a step-wise transition from a non-phonetic sound into a phonetic sound. The stimuli were presented in an event-related fMRI design. The fMRI-BOLD data were analysed using parametric contrasts. The results showed a higher sensitivity for sounds containing phonetic features compared to non-phonetic sounds in the middle part of STG, and in the anterior part of the planum temporale (PT) bilaterally. Although the same areas were involved in the processing of non-phonetic sounds, a difference in activation was evident in the STG, with an increase in activation related to increment of phonetic features in the sounds. The results indicate a stimulus-driven, bottom-up process that utilizes general auditory resources in the secondary auditory cortex, depending on specific phonetic features in the sounds.
一个常见的假设是，语音在颞上回和颞上沟（STG/STS）引发独特的处理过程。服务于这些过程的解剖区域也参与了对非语音刺激（如乐器声音）的处理。在本研究中，通过应用“声音变形”范式来研究语音和非语音声音的差异处理，在该范式中，语音特征的存在以参数方式变化，从而创建从非语音声音到语音声音的逐步过渡。刺激以事件相关功能磁共振成像（fMRI）设计呈现。使用参数对比分析fMRI血氧水平依赖（BOLD）数据。结果显示，与非语音声音相比，在STG中部以及双侧颞平面（PT）前部，包含语音特征的声音具有更高的敏感性。尽管相同区域参与了非语音声音的处理，但在STG中激活存在差异，随着声音中语音特征的增加，激活也增加。结果表明，这是一个刺激驱动的自下而上的过程，该过程在二级听觉皮层中利用一般听觉资源，这取决于声音中的特定语音特征。
