Multiple time axes for representation of echo delays in the auditory cortex of the mustached bat.
Multiple time axes for representation of echo delays in the auditory cortex of the mustached bat.
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DOI：
10.1152/jn.1986.55.4.776
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发表时间：
1986-04
影响因子：
2.5
通讯作者：
N. Suga;J. Horikawa
中科院分区：
文献类型：
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作者：
N. Suga;J. Horikawa
牙买加须蝠（Pteronotus parnellii parnellii）的定向声（脉冲）的性质与巴拿马须蝠（P. p. rubiginosus）相同。它由四个谐波组成，每个谐波包含一个长的恒频（CF）分量，然后是一个短的调频（FM）分量。因此，总共有八个组件：CF 1 -4和FM 1 -4。与红褐拟步行虫一样，帕氏拟步行虫听觉皮层的组合敏感区由两个主要部分（FM-FM区和CF/CF区）组成。FM-FM区域投射到背侧缘（DF）和其他区域。DF区神经元的反应潜伏期比FM-FM区长。在FM-FM区，水汽的分布是单峰的，而在DF区，水汽的分布是双峰的。在DF和FM-FM区神经元反应特性的电生理学研究中，我们的目的是找出这两个区域之间的信号处理可能有何不同。FM-FM和DF区域都由三种类型的FM-FM组合敏感神经元组成：FM 1-FM2，FM 1-FM 3和FM 1-FM 4。它们对单独的脉冲、单独的回声、单一的CF音或单一的FM声音没有反应或反应不佳。但是，当回声从脉冲中以特定的延迟传递时，它们显示出对回声的响应的强烈促进。脉冲-回波对中用于促进的基本元素是脉冲的FM 1和回波的FM 2或FM 3或FM 4。在FM-FM和DF区，绝大多数神经元表现出短暂的易化，其他神经元表现出持久的易化。FM-FM神经元被调谐到特定的回声延迟，即，目标范围。在FM-FM和DF区域中，延迟调谐曲线的宽度与最佳延迟的值线性相关。没有迹象表明，处理距离信息在DF领域比在FM-FM领域更专业。在FM-FM和DF区，三种类型的FM-FM神经元形成独立的簇。沿着每个簇的长轴，神经元的易化反应的最佳延迟根据神经元的位置系统地变化。位置越靠后，最佳延迟越长。因此，有六个时间（即，范围）轴。DF区域中的时间轴比FM-FM区域中的时间轴短。（400字处截断摘要）
The properties of the orientation sound (pulse) of the Jamaican mustached bat, Pteronotus parnellii parnellii is the same as the Panamanian mustached bat, P.p. rubiginosus. It consists of four harmonics, each containing a long constant-frequency (CF) component followed by a short frequency-modulated (FM) component. Thus, there are eight components in total: CF1-4 and FM1-4. The combination-sensitive area of the auditory cortex in P.p. parnellii consists of two major divisions (FM-FM and CF/CF areas) as in P.p. rubiginosus. The FM-FM area projects to the dorsal fringe (DF) and other areas. Response latencies of neurons in the DF area are longer than those in the FM-FM area. The distribution of latencies is unimodal for the FM-FM area, but bimodal for the DF area. In this electrophysiological study of the response properties of neurons in the DF and FM-FM areas, our aim was to find out how signal processing might be different between the two areas. Both the FM-FM and DF areas consist of three types of FM-FM combination-sensitive neurons: FM1-FM2, FM1-FM3, and FM1-FM4. They do not respond or respond poorly to pulse alone, echo alone, single CF tones or single FM sounds. But they show strong facilitation of response to the echo when it is delivered with particular delays from the pulse. The essential elements in the pulse-echo pair for facilitation are the FM1 of the pulse and FM2 or FM3 or FM4 of the echo. In both the FM-FM and DF areas, the great majority of neurons show short-lasting facilitation, and other neurons show long-lasting facilitation. FM-FM neurons are tuned to particular echo delays, i.e., target ranges. In both the FM-FM and DF areas, the width of a delay-tuning curve is linearly related to the value of a best delay. There is no sign that processing of range information is more specialized in the DF area than the FM-FM area. In both the FM-FM and DF areas, three types of FM-FM neurons form independent clusters. Along the major axis of each cluster, best delays for facilitative responses of neurons systematically change according to the loci of the neurons. The more posterior the location, the longer the best delay is. Therefore, there are six time (i.e., range) axes in total. The time axis in the DF area is shorter than that in the FM-FM area.(ABSTRACT TRUNCATED AT 400 WORDS)