Summing localization
Appearance
When two or more coherent sound signals arrive within a limited time interval (up to 1,5 ms) only one sound sensation is perceived. The time and level variations of all sound sources contribute to the direction of the perceived sound.
The resulting auditory event is called a phantom source.
Summing localization is the basis of stereophony.
References
Jens Blauert "Spatial Hearing", The MIT Press; Rev Sub edition (October 2, 1996)