Detection of a low-frequency tonal signal in the presence of various types of masker was studied using a two-alternative temporal forced-choice paradigm. The first experiment employed a tonal masker of the same frequency as the signal (500 Hz). The phase angle between signal and masker was either 0°, 45°, 90°, or 135°. The second experiment employed a tonal masker of 500 Hz and a tonal signal of 468 or 492 Hz. The third experiment employed an amplitude-modulated masker (carrier frequency = 500 Hz) and a tonal signal of 500 Hz; the phase angle between the signal and carrier component of the masker was again either 0°, 45°, 90°, or 135°. In all experiments, signal and masker were pulsed together for 128 msec, with a 10-msec rise-decay time. Masker stimuli were presented diotically at a level of 70 dB SPL. The signal tones were either identical in the two ears or phase-reversed in one ear relative to the other. The results are discussed in terms of previous tone-on-tone data and tone-in-noise data. Specifically, some conclusions are reached concerning the role of time-varying cues in binaural detection.