In a two‐interval, forced‐choice task, observers were to discriminate a binaural noise whose interaural correlation,r, varied according to the functionr(t) = m cos 2πfmtfrom an interaurally uncorrelated noise[NU; r(t) = 0.0]. The former stimulus produces a perceptual binaural “flutter,” where the flutter rate is equal to the modulation frequencyfm, and the amount of flutter corresponds tom. The stimuli were narrowband Gaussian noises with center frequencies of 0.5, 1.0, 2.0, or 4.0 kHz. Presentation level was 75 dB SPL; duration was 1.0 s. For a given modulation frequency, modulation “depth,”m, was varied in a blocked procedure, and thresholds were estimated from the psychometric functions as that value ofmrequired for 75% discdminability. For the 0.5‐kHz stimulus. thresholds increased fromm= 0.28 atfm= 1 Hz tom= 0.78 atfm= 50 Hz. For higher‐frequency stimuli, discrimination was generally poorer and the function relating thresholdmtofmwas flatter: thus, for 2 kHz,m= 0.56 atfm= 1 Hz, andm= 0.71 atfm= 20 Hz: for 4 kHz,m= 0.80 atfm= 1 Hz, but no thresholds could be determined forfm<5 Hz. The data will be discussed in relation to previous work on dynamic binaural processing. [Supported by NSF.]