Romani Cristina, Olson Andrew, Semenza Carlo, Granà Alessia
Psychology, Aston University, Birmingham, England.
Cortex. 2002 Sep;38(4):541-67. doi: 10.1016/s0010-9452(08)70022-4.
We present the case of two aphasic patients: one with fluent speech, MM, and one with dysfluent speech, DB. Both patients make similar proportions of phonological errors in speech production and the errors have similar characteristics. A closer analysis, however, shows a number of differences. DB's phonological errors involve, for the most part, simplifications of syllabic structure; they affect consonants more than vowels; and, among vowels, they show effects of sonority/complexity. This error pattern may reflect articulatory difficulties. MM's errors, instead, show little effect of syllable structure, affect vowels at least as much as consonants and, and affect all different vowels to a similar extent. This pattern is consistent with a more central impairment involving the selection of the right phoneme among competing alternatives. We propose that, at this level, vowel selection may be more difficult than consonant selection because vowels belong to a smaller set of repeatedly activated units.
一位是言语流畅的MM，另一位是言语不流畅的DB。两位患者在言语产生过程中出现语音错误的比例相似，且错误具有相似的特征。然而，进一步分析发现了一些差异。DB的语音错误大多涉及音节结构的简化；它们对辅音的影响大于元音；并且在元音中，它们表现出响度/复杂性的影响。这种错误模式可能反映了发音困难。相反，MM的错误几乎没有受到音节结构的影响，对元音的影响至少与辅音相同，并且对所有不同元音的影响程度相似。这种模式与涉及在竞争选项中选择正确音素的更中枢性损伤一致。我们提出，在这个层面上，元音选择可能比辅音选择更困难，因为元音属于一组反复激活的较小单位。
