In emergency situations pilots are often presented with the difficult task of distinguishing between simultaneous auditory warning signals, each with varying levels of importance. This inability to effectively discriminate between synchronous warnings can lead the pilot to ignore certain signals, to misinterpret them, or to be simply unaware of their presence. The creation of signals that could be easily construed and distinguished from other simultaneous signals would not only be desirable but would also contribute to increased situational awareness and better decision-making during emergencies.
Davis, M. J.
(2011). Applying Principles of Music Scene Analysis to Synchronous Auditory Warning Signals. 16th International Symposium on Aviation Psychology, 405-409.