RESPONSE PROPERTIES OF AUDITORY NEURONS IN THE MIDBRAIN OF THE DOMESTIC-FOWL (GALLUS-GALLUS) TO MONAURAL AND BINAURAL STIMULI
RESPONSE PROPERTIES OF AUDITORY NEURONS IN THE MIDBRAIN OF THE DOMESTIC-FOWL (GALLUS-GALLUS) TO MONAURAL AND BINAURAL STIMULI
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DOI：
10.1007/bf00610398
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发表时间：
1979-01-01
期刊：
影响因子：
--
通讯作者：
AITKIN, LM
中科院分区：
文献类型：
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作者：
COLES, RB;AITKIN, LM
细胞外记录是由家禽中脑[背侧中脑外侧核（NMLD）]的听觉单位进行的。单耳传递到任一耳的音调刺激显示对侧兴奋占主导地位，并伴有同侧[耳]抑制（EI，46％）、兴奋（EE，21％）或无影响（EO，17％）。传统的 V 形调谐曲线很容易从对侧兴奋阈值获得，但注意到复杂的效应，例如抑制边带和双灵敏度峰。最佳频率（BF）阈值的分布范围为60 Hz-5.0 kHz，最敏感区域在1.0-2.0 kHz之间。 BF 分析细胞类型揭示了 EI 和 EE 细胞的广泛分布； EO 细胞对 1.0 kHz 以上的 BF 有明显的偏差。双耳刺激用于研究单位对实验产生的耳间强度和时间（相位）差异的敏感性。在各种 BF 范围内，EI 细胞通常对高达 20 dB 的耳间强度差异表现出良好的灵敏度。表现出耳间时间敏感性的EE细胞在几毫秒内做到了这一点（最大物理延迟100μs）。这些效应似乎与刺激的周期（低于 800 Hz）有关，并反映了单位响应锁相的趋势。考虑到家禽头部尺寸和高频敏感性的限制，双耳强度差异可能是声音定位过程中唯一可行的线索。
Extracellular recordings were made from auditory units in the midbrain [nucleus mesencephalicus lateralis pars dorsalis (NMLD)] of the domestic fowl. Tonal stimuli delivered monaurally to either ear revealed that contralateral excitation predominated and was coupled with ipsilateral [ear] inhibition (EI, 46%), excitation (EE, 21%) or no effect (EO, 17%). Conventional V-shaped tuning curves were readily obtained from contralateral excitatory thresholds, however complex effects were noted such as, inhibitory sidebands and double sensitivity peaks. The distribution of best frequency (BF) thresholds ranged from 60 Hz-5.0 kHz, with the most sensitive region between 1.0-2.0 kHz. Analysis of cell types with BF revealed wide distributions for EI and EE cells; EO cells had a distinct bias for BF above 1.0 kHz. Binaural stimuli were used to study unit sensitivity to experimentally produced differences in interaural intensity and time (phase). EI cells generally showed good sensitivity for interaural intensity differences up to 20 dB, across a wide range of BF. EE cells which demonstrated interaural time sensitivity did so over several milliseconds (maximum physical delay 100 .mu.s). These effects appeared to be related to the period of the stimulus (below 800 Hz) and reflected a tendency for unit responses to be phase-locked. Considering the limits of head size and high frequency sensitivity in the domestic fowl, binaural intensity differences may be the only viable cue during sound localization.