In the head localization

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Language example without ICL
Speech example with IKL (use headphones)

The in-head localization , also briefly ICL called, is a special case of acoustic localization by a listener. While in the normal localization the location of the hearing event of a perceived sound source or the locations of several sound sources are perceived as being in the vicinity of the listener, the locations of sound sources appear to be in the head of the listener under certain circumstances .

Since the ICL was observed most frequently when sound signals were presented through headphones , it was initially assumed that the ICL was causally related to it. The reasons given were the headphones' lack of fidelity to transmission and the lack of bone conduction. The lack of a change in the auditory event location when the head is turned (the auditory event location moves with it) and the lack of distance information via the headphones are seen as further triggers of the ICL. These explanations do not take into account the fact that ICL can also occur when sound sources are far away (e.g. loudspeakers ), especially when two loudspeakers are radiated with reversed polarity .

The theory of the headphone- related cause became obsolete when headphone stereophony with artificial heads also succeeded in generating auditory event locations outside the head that correspond to the actual localization.

New theories assume that for each localization not only the sound signal arriving at the moment is evaluated, but rather a comparison is made with learned and stored stimulus patterns . Accordingly, ICL can always occur if the sound stimuli are of such a nature that they cannot be assigned to a possible sound source outside the head and / or an adaptation to a room and possible sound sources located in it has not taken place; when the listener is surprised by a sound source and its situation.

Remarks

  1. ↑ Bone conduction, as it is called in ear, nose and throat medicine , should not be disregarded in the normal localization, since a sound source usually not only covers the ears, but also the entire body of the listener.

literature

  • Georg Plenge, “On the Problem of In-Head Localization”, Akustica 26, 1972, p. 241
  • Georg Plenge, “On the problem of the intracranial localization of sound sources in human acoustic perception”, Habilschr. Berlin 1973
  • Günther Theile, “About the localization in the superimposed sound field”, dissertation, Berlin 1979
  • Matthias Thalheim: Dramaturgically staging consequences of artificial head stereophony in funk-dramatic productions , diploma thesis, Humboldt University Berlin 1985, Section Cultural Studies and Aesthetics, Theater Studies, Neoepubli Verlag Berlin 2016, ISBN 9783737597814