On the differences between localization and lateralization

It has been assumed that there is a basic difference between outside head localization when a sound comes from an external source and inside head localization when the sound is heard via headphones. Results show that the difference does not depend on the kind of electroacoustic transmission. The one condition for localisation is that the signals have to be such as to originate from an external source; if this is not the case, lateralization will occur.