THE REPRESENTATIONS OF THE STEADY-STATE VOWEL SOUND PHONEME-E IN THE DISCHARGE PATTERNS OF CAT ANTEROVENTRAL COCHLEAR NUCLEUS NEURONS
THE REPRESENTATIONS OF THE STEADY-STATE VOWEL SOUND PHONEME-E IN THE DISCHARGE PATTERNS OF CAT ANTEROVENTRAL COCHLEAR NUCLEUS NEURONS
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DOI：
10.1152/jn.1990.63.5.1191
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发表时间：
1990-05-01
影响因子：
2.5
通讯作者：
SACHS, MB
中科院分区：
文献类型：
--
作者：
BLACKBURN, CC;SACHS, MB
1.记录了巴比妥钠麻醉猫耳蜗前腹核(AVCN)神经元对不同刺激强度合成的稳态元音/e/的反应。2.(假定)球形丛状细胞[初级类(PRI)单位]对元音的反应类似于听神经纤维(ANF)在低和中等刺激水平下的频率和时间编码。不可能研究大多数PRI单位在最高刺激水平下的反应，因为在较高刺激水平下，大多数初级类似单位的记录中存在着大量的神经音素成分。3.许多(假定的)球状丛状细胞[具有凹槽(PN)的初级单位]对元音的反应与ANF相似；然而，在时间和速率编码方面，PN群体中的单位的反应似乎比PRI群体中的单位具有更大的异质性。4.星状细胞群(斩波单位)降低了对元音反应的ANF群放电模式中的时间信息的表征，这与这些单位对纯音的反应一致。然而，规则(CHS)和不规则(CHT)斩音子群体比ANF群体作为一个整体保持了更好的元音频谱的比率位置表示。在大多数刺激水平下，这两个切割者群体的元音频谱的频率-位置表示与低和中等自发频率的ANF非常相似。5.本文提供的数据表明，AVCN斩波器群体的功能分区可以产生两种不同的速率表示，以响应复杂的刺激：一种是根据刺激水平(在30至40分贝范围内)分级的，即使在速率饱和时，也保持“低对比度”刺激表示；另一种是在所有级别保持稳健的、“高对比度”的刺激表示，但提供的关于刺激水平的信息较少。
1. We have recorded the responses of neurons in the anteroventral cochlear nucleus (AVCN) of barbiturate-anesthetized cats to the synthetic, steady-state-vowel sound /e/, presented over a range of stimulus intensities. 2. The responses of (putative) spherical bushy cells [primary-like (Pri) units] to the vowel resemble those of auditory-nerve fibers (ANFs) in terms of both rate and temporal encoding at low and moderate stimulus levels. It was not possible to study the responses of most Pri units at the highest stimulus level because of the large neurophonic component present in recordings from most primarylike units at higher stimulus levels. 3. The responses of many (putative) globular bushy cells [primarylike with notch (PN) units] to the vowel resemble those of ANFs; however, there appears to be greater heterogeneity in the responses of units in the PN population than in the Pri population in terms of both temporal and rate encoding. 4. Populations of stellate cells (chopper units) have degraded representations of the temporal information in ANF population discharge patterns in response to the vowel; this is consistent with the responses of these units to pure tones. Both regular (ChS) and irregular (ChT) chopper subpopulations, however, maintain better rate-place representations of the vowel spectrum than does the population of ANFs as a whole. The rate-place representations of the vowel spectrum by both chopper populations closely resemble those of low and medium spontaneous rate ANFs at most stimulus levels. 5. The data presented in this paper suggest that a functional partition of the AVCN chopper population could yield two distinct rate representations in response to a complex stimulus: one that is graded with stimulus level (over a 30 to 40 dB range) and that, even at rate saturation, maintains a "low contrast" stimulus representation; and a second that maintains a robust, "high contrast" stimulus representation at all levels but that confers less information about stimulus level.