CODING OF SOUND LOCATION AND FREQUENCY IN THE AUDITORY MIDBRAIN OF DIURNAL BIRDS OF PREY, FAMILIES ACCIPITRIDAE AND FALCONIDAE
CODING OF SOUND LOCATION AND FREQUENCY IN THE AUDITORY MIDBRAIN OF DIURNAL BIRDS OF PREY, FAMILIES ACCIPITRIDAE AND FALCONIDAE
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DOI：
10.1007/bf01350024
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发表时间：
1985-01-01
影响因子：
2.1
通讯作者：
PETTIGREW, JD
中科院分区：
文献类型：
--
作者：
CALFORD, MB;WISE, LZ;PETTIGREW, JD
研究了褐鹰（Falco berigora）、沼泽鹞（Circus aeruginosus）和褐苍鹰（Accipiter fasciatus）三种昼夜活动的鸟类听觉中脑核（nMLD）的声音频率和位置编码。在此之前，这个核只在另一种物种——仓鸮（Tyto alba）身上用自由场刺激进行过研究。我们发现，夜行猛禽的nMLD组织与谷仓猫头鹰的nMLD组织有一些相似之处，即nMLD的中心区域是局部组织的，包含不编码位置的细胞，而侧区（nMLDl）包含对刺激位置敏感的细胞。然而，与仓鸮不同的是，仓鸮对刺激位置敏感的细胞有很大的感受野，但在方位上受限制，而在高度上不受限制（半场单位）。这种细胞不能提供同时表示方位角和高程尺寸的声学空间图，但在nMLDl中，具有对侧边界的单元倾向于在表层被发现，而具有同侧边界的单元倾向于在深层被发现。如果存在一个对耳间强度差异敏感的中枢机制，那么在声音通过耳间管传播时，半场单元显示出与鼓膜定向特性一致的接受野特性。
The coding of sound frequency and location in the avian auditory midbrain nucleus (nMLD) was examined in three diurnal raptors: the brown falcon (Falco berigora), the swamp harrier (Circus aeruginosus) and the brown goshawk (Accipiter fasciatus). Previously this nucleus has been studied with free field stimuli in only one other species, the barn owl (Tyto alba). We found some parallels between the organisation of nMLD in the diurnal raptors and that reported in the barn owl in that the central region of nMLD was tonotopically organised and contained cells that did not encode location, and the lateral region (nMLDl) contained cells which were sensitive to stimulus position. However, unlike the barn owl, which has units with circumscribed receptive fields, cells sensitive to stimulus location had large receptive fields which were restricted in azimuth but not in elevation (hemifield units). Such cells could not provide an acoustic space map in which both azimuthal and elevational dimensions were represented, but there was a tendency for units with contralateral borders to be found superficially, and those with ipsilateral borders to be found deep, in nMLDl. Hemifield units displayed receptive field properties consistent with the directional properties of the tympana in the presence of sound transmission through the interaural canal, if there is a central mechanism which is sensitive to interaural intensity differences.