Sonification
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Several levels of spatial sounds: 
 
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1- Mono
2- Stereo (differenciate right from left, east from west) 
3- Spatial
right/left (easy) + up/down (hard) + front/back (very hard) + distance (not really)
 
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Perception of spatial effects seems to improve when using personal head-related transfer function (HRTF)
 
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Also improves when using head tracking (but requires special hardware).
 
 
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