SPIDER VIBRATION RECEPTORS - THRESHOLD CURVES OF INDIVIDUAL SLITS IN THE METATARSAL LYRIFORM ORGAN
SPIDER VIBRATION RECEPTORS - THRESHOLD CURVES OF INDIVIDUAL SLITS IN THE METATARSAL LYRIFORM ORGAN
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DOI：
10.1007/bf00619124
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发表时间：
1982-01-01
期刊：
影响因子：
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通讯作者：
GEETHABALI
中科院分区：
文献类型：
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作者：
BARTH, FG;GEETHABALI
萨氏铜蛛（Cupienniussalei）跖骨末端的复合狭缝感觉器（琴状器）对振动具有高度敏感性。它的形态和它的地形都很好地适应于感知由跗骨拾取的基板振动。阈值曲线测量与仔细控制的正弦波刺激频率为0.1-1 kHz。它们分别确定了约一半的21缝，使这个器官。在所有情况下和在所研究的所有狭缝中，受体表现得像高通滤波器，具有10- 3cm至10- 2cm直至λ的相对低的灵敏度。40 Hz，在1 kHz时阈值位移急剧下降至10-7 cm。在低频率高达. apprx。40 Hz（在某些狭缝中仅为1 Hz）时，阈值曲线遵循大致恒定的位移，而在更高的频率下，它们遵循大致恒定的加速度。变化在两个方向的跗骨位移（背腹侧或横向）和在一种耦合之间的跗骨和振动器只适度影响调谐曲线的形状。在任何实验中，都没有发现狭缝在有限的频率范围内有明显的调谐，包括在自然条件下，跗骨与振动的底层没有牢固耦合的情况。在松散耦合的情况下，在10 Hz以下，灵敏度只有轻微的下降。所有的裂缝测试响应横向以及背腹侧位移的跗骨。阈值曲线在形状和绝对值上基本相似，除了在600 Hz和1 kHz之间的小下降，发现4个狭缝中的2个狭缝测试，并指示轻微的共振。尽管总体上相似，但同一器官的各种狭缝的调谐曲线存在差异。这些差异在某个频率上大到1.5个数量级，并且可以形成至少粗略频率辨别的基础，该粗略频率辨别取决于CNS识别该复合器官中的几个或所有狭缝的变化活动模式的能力。除了少数严格的阶段性狭缝，大多数研究的狭缝显示出缓慢下降的反应持续偏转的跗骨。因此，振动敏感性不被认为是跖骨琴状器官的全部功能。一个额外的本体感觉功能监测运动过程中的跗骨运动的建议。
The compound slit sense organ (lyriform organ) on the distal end of the spider [Cupiennius salei] metatarsus is highly vibration sensitive. Both its morphology and its topography are well adapted to perceive substrate vibrations picked up by the tarsus. Threshold curves measured with carefully controlled sine-wave stimulation at frequencies 0.1-1 kHz are presented. They were determined individually for about half of the 21 slits which make up this organ. In all cases and in all slits studied the receptors behave like high-pass filters with relatively low sensitivity of 10-3 cm to 10-2 cm up to .apprx. 40 Hz, and steeply decreasing threshold displacement down to 10-7 cm at 1 kHz. At low frequencies up to .apprx. 40 Hz (in some slits only 1 Hz) the threshold curves follow roughly constant displacement whereas at higher frequencies they follow roughly constant acceleration. Variation in both the direction of tarsal displacement (either dorsoventral or lateral) and in the kind of coupling between the tarsus and the vibrator only moderately affects the tuning curve shapes. No marked tuning of the slits to limited frequency ranges was found in any experiments, including cases where the tarsus was not firmly coupled to the vibrating substratum as it would under natural conditions. With loose coupling there is only a slight shift towards lower sensitivity below 10 Hz. All slits tested responded to lateral as well as to dorsoventral displacement of the tarsus. Threshold curves are essentially similar in shape and absolute values except for small dips between 600 Hz and 1 kHz found with 2 of the 4 slits tested and indicating slight resonances. Despite the overall similarity there are differences in the tuning curves of the various slits of the same organ. These differences are as large as 1.5 orders of magnitude at a certain frequency, and may form the basis for at least a crude frequency discrimination which depends on the ability of the CNS to recognize the changing activity pattern of several or all slits in this compound organ. Except for a few strictly phasic slits, the majority of the slits studied shows a slow decline of responses to sustained deflection of the tarsus. Vibration sensitivity is therefore not regarded as the full function of the metatarsal lyriform organ. An additional proprioceptive function monitoring tarsal movement during locomotion is suggested.