Mechanisms underlying phonotactic steering in the cricket Gryllus bimaculatus revealed with a fast trackball system
Mechanisms underlying phonotactic steering in the cricket Gryllus bimaculatus revealed with a fast trackball system
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DOI：
10.1242/jeb.01452
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发表时间：
2005-03-01
影响因子：
2.8
通讯作者：
Poulet, JEA
中科院分区：
文献类型：
--
作者：
Hedwig, B;Poulet, JEA
蟋蟀G.用一种新的高灵敏度跟踪球系统分析双斑鱼，该系统的空间和时间分辨率分别为127 μ m和0.3 ms。对人工呼唤歌曲的定向开始于45 dB SPL，然后增加到75 dB SPL，然后饱和。当暴露于两种不同强度的相同模式时，只要强度差异大于1 dB，蟋蟀就会明显转向更大的声音模式。双侧潜伏期的差异，在健全的介绍并不总是导致明确的方向朝向领先的一方。整体行走方向取决于从左侧或右侧感知到的声音脉冲的数量，动物转向提供更多脉冲的一侧。记录表明，即使在啁啾期间，行走方向也会发生快速变化。这些快速的转向反应发生在55-60 ms的潜伏期，远在中枢神经系统有时间评估整个啁啾的时间结构之前。当每隔一个声音脉冲从相反的方向呈现时，蟋蟀遵循声音呈现的时间模式，迅速转向左侧和右侧。转向单个声音脉冲不同意蟋蟀分析声音模式的质量，然后转向更好的模式的建议。相反，这些实验表明，快速转向单一的声音脉冲决定了动物的横向偏差，复杂的听觉定向从这种简单的听觉转向机制中产生。
Phonotactic steering behaviour of the cricket G. bimaculatus was analysed with a new highly sensitive trackball system providing a spatial and temporal resolution of 127 gm and 0.3 ms, respectively. Orientation to artificial calling songs started at 45 dB SPL, it increased up to 75 dB SPL and then saturated. When exposed to two identical patterns of different intensity, crickets significantly steered towards the louder sound pattern, whenever the intensity difference was greater than 1 dB. Bilateral latency differences in sound presentation did not always cause clear orientation towards the leading side. The overall walking direction depended on the number of sound pulses perceived from the left or right side with the animals turning towards the side providing the larger number of pulses. The recordings demonstrated rapid changes in walking direction performed even during a chirp. These rapid steering responses occurred with a latency of 55-60 ms, well before the central nervous system had time to evaluate the temporal structure of a whole chirp. When every other sound pulse was presented from opposite directions, the crickets followed the temporal pattern of sound presentation and rapidly steered towards the left and right side. Steering towards individual sound pulses does not agree with the proposal that crickets analyse the quality of sound patterns and then steer towards the better pattern. Rather, these experiments suggest that fast steering to single sound pulses determines the lateral deviation of the animals and that complex auditory orientation emerges from this simple mechanism of auditory steering.