<p>The influence of a masker on localization of a sound signal in the vertical sagittal plane was studied in conditions of masking using simultaneous masking and the paradigm of the precedence effect. In the first case, a stationary signal and a masker were presented simultaneously, while in the second, signal onset was shifted relative to masker onset. Shift values (delays) were 2, 4, 8, 20, 40, 80, and 200 msec. Uncorrelated noise pulses with a bandwidth of 5–18 kHz were used as signal and masker. Noise pulse duration was 1 sec. The masker was always presented at an angle of 90° elevation (above the listener’s head) and the signal from a position of 7.5° elevation (in front of the listener relative to the interaural line). The perceived angular position of the signal in masking conditions was compared with spatial estimates of the same signal when presented in isolation (without a masker); similarly, localization of the masker in masking conditions was compared with the perceived position of an isolated masker (without a signal). Signal detection probability was found to decrease in masking conditions. At delays of 0–40 msec, listeners mainly identified the perceived position of the masker, which was shifted towards the signal regardless of the delay value and was significantly different from the perceived position of the isolated masker. Signal localization probability at these delays was no more than 8%. At delays of 80 msec and longer, signal localization probability increased to 92% and more. Perceived signal position did not depend on delay duration and was not significantly different from the position of the isolated signal.</p>