RESPONSES OF THE SINGLE THREAD HAIR SENSILLUM OF THE CERCUS OF THE COCKROACH PERIPLANETA AMERICANA TO MECHANICAL STIMULI
蜚蠊尾须单个细毛型感受器对机械刺激的反应

Receptor potential and neuronal impulses were recorded extracellulary on 147 sensilla of 43 animals fom the socket disk of the hair sensillum viith a tungsten microelectrode. The deflection of the hairshaft (within the preference plane)was controlled with the aid of an electromagnetic pusher driven by sinusoidal, square wave or double-step wave input currents.Without mechanical stimulus, the inter-spike interval histogram of the spontaneous impulses had an exponential distribution except at the range of small interval. When the hair was deflected in the excitatory or inhibitory directions) a depolarizing or a hyperpolarizing receptor potential was shown, and correspondingly the impulse frepuence was increased or decreased. The receptor potentials were phasic-tonic with slow adaptation and the amplitudes were determined within a certain degree, by the deflection angle of the hairshaft. The impulses, however, were phasic depending on the direction in which the hairshaft was moving. The exctiatory directions for the 6 columns of the hair sensilla, namely, d, g, h, i, k, l, were also determined.