Richtinghoren door patiënten met eenzijdige sensorineurale doofheid (SSD): invloed van oorschelp karakteristieken, hoog-frequent gehoorverlies in het horende oor, en gebruik van een beengeleidingshoortoestel Myrthe Hol Department of Otorhinolaryngology, Radboud University Medical Centre, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands Emmanuel Mylanus and Prof. Ad Snik Department of Biophysics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, The Netherlands Martijn Agterberg, Rens Van de Goor, Marc Van Wanrooij and Prof. John Van Opstal Hearing & Implants Richtinghoren door patiënten met eenzijdige sensorineurale doofheid (SSD): invloed van oorschelp karakteristieken, hoog-frequent gehoorverlies in het horende oor, en gebruik van een beengeleidingshoortoestel Myrthe Hol Department of Otorhinolaryngology, Radboud University Medical Centre, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands Emmanuel Mylanus and Prof. Ad Snik Department of Biophysics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, The Netherlands Martijn Agterberg, Rens Van de Goor, Marc Van Wanrooij and Prof. John Van Opstal Hearing & Implants Binaural cues for sound localization in azimuth ♦ Interaural level differences (ILDs) ILDs > 3 kHz ♦ Interaural time differences (ITDs) ITDs < 1.5 kHz Sound source L1 R1 Head Shadow Amplitude Monaural cues for sound localization in the vertical plane Ampl. 40° Freq. Ampl. 40° HRTFs Freq. -40° Freq. Ampl. Ampl. - 40° Freq. Sound localization in azimuth and elevation - Complete dark, sound-attenuated room - Listeners seated in the centre in a chair - 58 speakers - Duration 150 ms - Roving sound level (45 - 65 dB SPL) - Noises with different bandwidths Location (deg) broadband (0.5 – 20 kHz) low-pass (0.5 – 1.5 kHz) high-pass (3 – 20 kHz) 60 40 20 0 0 500 Time in msec (Hofman and Van Opstal, 1998) Sound-localization normal hearing listeners Azimuth Elevation Response azimuth (deg) Response Elevation (deg) Stimulus azimuth (deg) Stimulus Elevation (deg) Gain (g) close to 1.0 means good sound localization Often SSD listeners perceive sounds at their hearing side Response azimuth (deg) Sound-localization of SSD listener Stimulus azimuth (deg) Spectral cues for sound-localization of NH listeners Horizontal Vertical εR = 0.83εT + 1.8 r2 = 0.92 r2 = 0.91 60 60 30 30 0 0 -30 -30 -60 -60 -90 -90 0 30 60 -60 -30 Stimulus azimuth (deg) 90 0 30 60 -90 -60 -30 Stimulus elevation (deg) 90 -90 90 εR = 0.02εT + 8.4 α R = 1.1α T + 2.7 Response azimuth (deg) 90 r2 = 0.94 r2 = 0.0081 90 60 60 30 30 0 0 -30 -30 -60 -60 -90 -90 -60 -30 0 30 60 Stimulus azimuth (deg) 90 -90 -60 -30 0 30 60 Stimulus elevation (deg) Hofman and Van Opstal, 2003 -90 90 Response elevation (deg) Response azimuth (deg) 90 Response elevation (deg) α R = 1.1α T - 0.068 Acoustic localization cues operate in different frequency bands: ITD’s ILD’s + HRTF’s E = +20 AMP (dB) 1 .5 2 Freq (kHz) 4 8 16 E = - 10 E = - 40 BB LP HP Effect of Mould in Good Ear on Horizontal Sound Localization in 2 SSD listeners Surprisingly good (high gain) monaural sound localization SSD patients use spectral-shape cues for localization in azimuth Effect of high-frequency hearing loss on sound localization Gain Monaural BCD does not affect monaural localization of listeners with SSD (n=19) Red indicates PTA for 4 and 8 kHz ≥ 25 dB HL Gain BCD on Conclusions Large variation in unaided sound localization abilities of patients with SSD Congenital/acquired High frequency loss in hearing ear SSD patients use spectral-shape cues for localization in azimuth Already at the age of 6 children localize BB noises (0.5 – 20 kHz) in azimuth and elevation as good as adults BCD does not deteriorate or improve directional hearing in listeners with SSD Acknowledgements Prof. C. Cremers, MD Dr. J. Leijendeckers Dr. A. Bosman Rik Otten Tinna Arts Gunter Windau Chris-Jan Beerendonk Funding The William Demants og Hustru Ida Emilies Fond The Dutch Donders Institute for Brain, Cognition and Behaviour Radboud University Nijmegen Medical Center Nijmegen BI Team 2014 Myrthe Hol Ad Snik Emmanuel Mylanus Mieki Verbruggen Maarten de Wolf Teja Repkes Rik Nelissen Hubert Faber Herman Maurice Kok van Dongen Hearing & Implants Arjan Bosman Danielle van Gogh Martijn Agterberg Tamara Munnix Carine Hendriks
© Copyright 2024 ExpyDoc
