French A S
J Neurosci. 1984 Aug;4(8):2063-8. doi: 10.1523/JNEUROSCI.04-08-02063.1984.
The receptor potential in the cockroach tactile spine was measured during mechanotransduction by recording from the afferent axon about 0.5 mm from the sensory ending. The receptor potential was a linear function of spine position, but its amplitude and phase varied with the mean position of the spine. This can be related to the mechanical linkage from the socket of the spine to the sensory ending. The frequency response for mechanotransduction was flat over a frequency range of 0.1 to 100 Hz, after accounting for the cable properties of the axon, and there was no evidence of adaptation. The length constant and membrane time constant of the axon were estimated to be 130 microns and 1 msec, respectively. The threshold amplitude of movement required to produce action potentials was also measured as a function of frequency. It gave a power law relationship which was exactly the inverse of the frequency response of the receptor during strong stimulation and rapid firing. This suggests that adaptation of the sensory discharge in this receptor is produced by the action potential encoding mechanism.
在机械转导过程中，通过记录距感觉末梢约0.5毫米处的传入轴突，测量蟑螂触觉刺中的感受器电位。感受器电位是刺位置的线性函数，但其幅度和相位随刺的平均位置而变化。这可能与从刺的窝到感觉末梢的机械连接有关。在考虑轴突的电缆特性后，机械转导的频率响应在0.1至100赫兹的频率范围内是平坦的，并且没有适应的证据。轴突的长度常数和膜时间常数估计分别为130微米和1毫秒。产生动作电位所需的运动阈值幅度也作为频率的函数进行了测量。它给出了一个幂律关系，这与强刺激和快速放电期间感受器频率响应正好相反。这表明该感受器中感觉放电的适应是由动作电位编码机制产生的。
