Stochastic Resonance Demonstration of stochastic resonance in a cuticular filiform hair mechanoreceptor on the tailfan of a crayfish. Signal-to-noise ratios (SNR) were obtained from power spectra computed from the spiking activity of the mechanoreceptor during stimulation with water motions consisting of a near-threshold sinusoidal signal (55Hz) plus quasi-white noise. The SNR measures the coherence of spike timing with the signal frequency, and shows a noise-induced signal enhancement at an optimal noise intensity of ca. 0.14V r.m.s. For additional information, see Douglass et al. (1993) and Douglass & Wilkens (1998).