Difference‐limens for the discrimination of intermittence were obtained at ten interruption rates of random noise between 1 and 320 cps. The duty cycle of the intermittent noise was 0.5 and the sound pressure level was 75 db. Data from four listeners give average deviations from the standard frequency (ΔF) of 0.02 to 9.74 cps. The graph relating ΔFandFfrom 1 to 320 cps shows ΔFto be a monotonically increasing function ofF. When the data are plotted with logarithmic coordinates, two functions are revealed, suggesting a change in the method of frequency discrimination at about 5 cps. This change appears due to the listener's ability to count the noise bursts from 1 to 5 cps, but not above about 5 cps. The relationship between 5 and 320 cps may be described by a parabolic function of the formy = axb. Below 5 cps, the form of the relationship cannot be determined from the data available. The relative difference‐limen, ΔF/F, lies between 0.008 and 0.03, and graphic integration of 1/ΔFyields 560 just noticeable differences in the range studied. These data show difference‐limens for flutter that are smaller than those previously reported.