Klinik und Poliklinik für Hals-, Nasen- u. Ohrenkranke
Josef Schneider Str. 11, D-97080 Würzburg
Research foci (and basic equipment-based research projects):
Sound localisation in bilateral cochlear implant (CI) users:
From the hearing and visual sense human beings get the idea of living in a 3-dimensional world. The question arises, can bilaterally implanted CI users be back in an auditory 3-D world. To answer this question localisation test were performed in an anechoic chamber. Seven loudspeakers were equally distributed along a semicircle between -90° ( i.e. straight left) and +90° ( i.e. straight right ). The subject was seated in the middle of the semicircle. CCITT noise burst of 500 ms duration were used as test items. Presentation level was 80 dB SPL. The order in which the noise bursts were presented over loudspeakers was randomized with a total of five presentations per loudspeaker. After each presentation the subject indicated the loudspeaker where he assumed the noise burst was coming from. If the correlation between the stimulus and judgement was significantly greater 0 on an level of 5% then the subject's ability to localize sounds was considered proven.
In concunction with the criterion formulated above, seven subjects out of 9 were able to localize sounds. Among those subjects with a significant correlation the standard deviation of the judgements calculated over all Loudspeakers amounts 25.3°. Schön F, Müller J, Lateralisation und Lokalisation nach binauraler Cochlea-Implantat-Versorgung, Z. Audiol 2001, Suppl IV 42-43
Anechoic chamber, PC controlled loudspeaker array