Representation of sensory information in the cricket cercal sensory system. I. Response properties of the primary interneurons.
Representation of sensory information in the cricket cercal sensory system. I. Response properties of the primary interneurons.
复制标题
板球尾部感觉系统中感觉信息的表示。
DOI：
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发表时间：
1991
影响因子：
2.5
通讯作者：
F. Theunissen
中科院分区：
文献类型：
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作者：
John P. Miller;G. Jacobs;F. Theunissen
1.测试了蟋蟀颈感觉系统中六种不同类型的初级风敏感中间神经元对单向气流刺激的方向和峰值速度的敏感性。2.根据细胞的阈值和对气流速度的静态敏感性，可以将细胞分为两个不同的类别。3.四个中间神经元（左右10-2细胞和左右10-3细胞）组成了两个不同的速度敏感性类别之一。这些中间神经元的平均放电频率在0.02至2.0 cm/s的范围内与峰值刺激速度的对数成正比。4.研究的另外两个中间神经元（左9 - 3和右9-3）具有更高的气流速度阈值，接近10-2和10-3中间神经元的饱和水平。9-3中间神经元的速度敏感性曲线的斜率略大于10-2和10-3中间神经元的斜率，将整个系统的敏感性范围扩展到至少100 cm/s。5.所有的中间神经元都具有宽的、对称的、单瓣的方向灵敏度调谐曲线，这些曲线可以准确地表示为具有360度周期的截断正弦波。6.四个低阈值中间神经元（即，左和右10-2和10-3）具有围绕水平面均匀间隔的峰值方向灵敏度，并且它们的重叠调谐曲线覆盖了所有可能的气流刺激方向。细胞对相同重复刺激的反应的方差在最佳刺激方向的约10%和零交叉方向的约30%之间变化。7.两个较高阈值的中间神经元（左和右9-3）具有更宽的方向敏感性曲线和更宽的间距，导致相对于低阈值类的重叠减少。
1. Six different types of primary wind-sensitive interneurons in the cricket cercal sensory system were tested for their sensitivity to the orientation and peak velocity of unidirectional airflow stimuli. 2. The cells could be grouped into two distinct classes on the basis of their thresholds and static sensitivities to airflow velocity. 3. Four interneurons (the right and left 10-2 cells and the right and left 10-3 cells) made up one of the two distinct velocity sensitivity classes. The mean firing frequencies of these interneurons were proportional to the logarithm of peak stimulus velocity over the range from 0.02 to 2.0 cm/s. 4. The other two interneurons studied (left and right 9-3) had a higher air-current velocity threshold, near the saturation level of the 10-2 and 10-3 interneurons. The slope of the velocity sensitivity curve for the 9-3 interneurons was slightly greater than that for the 10-2 and 10-3 interneurons, extending the sensitivity range of the system as a whole to at least 100 cm/s. 5. All of the interneurons had broad, symmetrical, single-lobed directional sensitivity tuning curves that could be accurately represented as truncated sine waves with 360 degree period. 6. The four low-threshold interneurons (i.e., left and right 10-2 and 10-3) had peak directional sensitivities that were evenly spaced around the horizontal plane, and their overlapping tuning curves covered all possible air-current stimulus orientations. The variance in the cells' responses to identical repeated stimuli varied between approximately 10% at the optimal stimulus orientations and approximately 30% at the zero-crossing orientations. 7. The two higher threshold interneurons (left and right 9-3) had broader directional sensitivity curves and wider spacing, resulting in reduced overlap with respect to the low-threshold class.