Spontaneous Discharge and Response to Mechanical Stimulus Occurring in the Sensory Receptor in the Antenna of Crayfish

The responses of the sensory cell in the first antenna of crayfish show rapid adaptation and nearly irregular discharge at a glance in accordance with the application of the mechanical stimulus to the sensory hair. By presupposing that the irregular discharge includes some in formation, we carry out statistical analysis about it. The activity of the sample is examined from analyzing the average of the firing rate in spontaneous discharge. It is shown that the sample is kept in steady state for about two hours long at constant temperature (about 16℃) of liquid paraffin in which the sample is fixed. On the basis of mentioned above, the stimulus-response is studied. When the mechanical stimulus is applied to the sensory hair, the sensory cell responds mainly to the velocity.