Stevens Hanna E, Wickesberg Robert E
538 Psychology, Neuroscience Program, University of Illinois at Urbana-Champaign, 603 E. Daniel St., 61820, USA.
Hear Res. 2002 Nov;173(1-2):119-33. doi: 10.1016/s0378-5955(02)00608-1.
Recent physiological results from the auditory nerve suggest that specific response patterns for word-initial /d/ and /t/ are present across acoustic variations. In this study, single cell recordings from the auditory nerve of anesthetized chinchillas in response to the stop consonants /d/ and /t/ presented in a variety of acoustic contexts were analyzed. Consonants had variable word positions, vowel contexts, types of phonation, and speakers. The response patterns from individual auditory nerve fibers did not reliably differentiate the consonants /d/ and /t/. Global average peristimulus time histograms (GAPSTs) contained invariant patterns for all tokens of each word-final consonant, regardless of context. Ensemble responses to word-final consonants had similarities in their temporal patterns to those in GAPSTs for word-initial consonants. The similar representations in the ensemble auditory nerve response for consonants with different acoustic content suggest a possible substrate for perceptual normalization. Both invariant and variable elements of speech can be computed from the ensemble response of the auditory nerve.
近期来自听神经的生理学结果表明，在声学变化中存在单词开头/d/和/t/的特定反应模式。在本研究中，分析了麻醉的龙猫听神经对在各种声学环境中呈现的塞音/d/和/t/的单细胞记录。辅音具有可变的单词位置、元音环境、发声类型和说话者。单个听神经纤维的反应模式不能可靠地区分辅音/d/和/t/。全局平均刺激后时间直方图（GAPSTs）包含每个单词结尾辅音所有样本的不变模式，无论上下文如何。对单词结尾辅音的整体反应在时间模式上与单词开头辅音的GAPSTs相似。听神经对具有不同声学内容的辅音的整体反应中的相似表示表明了一种可能的感知归一化基础。语音的不变和可变元素都可以从听神经的整体反应中计算出来。
