Frequency Transposition
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A fantastic presentation detailing the work undertaken on a study of frequency transposition. The results speak for themselves.
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Frequency Transposition
- 1. Frequency Transposition in hearing aids for school-age children Jenny Smith 1,2 ,Marilyn Dann 1 and Margaret Brown 1 1 Deafness Studies Program, Graduate School of Education, University of Melbourne, Australia. 2 Jenny Smith, Audiological Consultancy, South Yarra, Australia Contact: jensmi@ozemail.com.au
- 14. Setting AE Turquoise AE=2000 E Purple AE= 2000 B Green AE=2500 B Blue AE=3200 B
- 15. Verifying the Fitting VC = maximum
- 16. Evaluating Aid Benefit Test Parameter Parent/student Questions and interviews Changes in overall hearing Teacher /student LIFE Changes in classroom listening Recorded speech sampling Speech Production Goldman-Fristoe Test of Articulation Speech Articulation CNC words and phonemes Speech Perception
- 18. Speech Perception : CNC words Significantly better scores recorded 6 weeks post-fit and sustained over time
- 19. Speech Production: G-F 2 Test Substitution : initial /z/ with /d/, Omission: final /v/ Lateralised: initial /dz/ Substitution: final /f/ with /s/ Omission: Final /d/ Slushiness greatly reduced Says himself with AE off he cannot hear /s/ 90 Post Fit Omission: final /dz/, /v/, /s/, /z/ Lateralised: initial /s/ Omission: final /s/ Substitution: kl with kr sp with /b/ Omission: initial /g/ final /p/; substitution: medial /v/ with /b/; weak /r/ Slushy quality Lateral /s/ 54 Pre-Fit Fricatives sentences Fricatives In words Consonant clusters Single consonant Over-all production G-F Score
- 20. Speech Production: G-F 2 Test 90 Post-Fit 54 Pre-Fit
- 22. Classroom listening: LIFE +35 +17 0 -17 -35 LIFE Student Response LIFE Teachers Response +35 = Strong support for positive change: use is highly beneficial 12 weeks post FT introduction 81.6 (+ 18.3%) 86.6 63.3 IN9-AE % 12 wks post -fit IN9 –M % 3wks post-fit Pre-Fit %
- 23. Described benefit Not really, he’s a teenager One at a time is OK Participating more in family discussions Most definitely I hear the whole sentence Responding better in 1:1 conversations Not that I have observed I heard the birds Hearing high soft environmental sounds Definitely hearing car indicators and gears I hear the phone ring and the kettle boil Hearing new sounds These aids are working wonders for him I am hearing, not deaf Overall comment Much clearer, even his grandfather commented Sounds different Changes in own speech Sometimes Same as old aids Understanding unknown speakers Parent Student
- 29. Speech Perception : CNC words Significantly better scores with frequency transposition (AE-ON) over time Middle ear infection and school holidays linked to poorer scores at 12-18wks
- 42. Figure 1.1 Similarity of the two vowels oo and ee when the second formant is inaudible because of hearing loss ( grey area). Sound level ee 250 1000 4000 Frequency (Hz) 500 2000 oo First formant Second formant Source: Dillon (2001): Hearing Aids Audibility of formants
Editor's Notes
- Exomphalos occurs when the abdomen fails to close around the base of the umbilical cord during the early development of the baby.
- Working with teachers, there is big emphasis on learning to listen – prelingual losses – we don’t talk about acclimaitization it is all new info One way to explore is too see what happens when we take aweay the freq trans
- Learing points: 1 he is not an engineer – doesn’t have the technical specs for inteo – 2. He is boy with a profound loss and doesn’t have the auditory map 3. he has had AE for 6 months and his ear and his brain have begun a conversation – this is neural plasticity at work 4. He is searching for the way to describe what has happened – its quieter ,lower, not quite what he wants to say 5. He searches his memory – he has just left primary school and in aust primary schools tod’s would regualrly verify aid function using ht eLING sounds – this means they say where are you aids – this boy is a reluctant user – so teach will say your schoolbag doesn’t need to hear - turn your back tell me if you can hear – oo,ee, ah sh,s – doesn’t hear – increase intenisty and lateralise sound ( and give a spray) child hears – but also then learns the lateral /s/ 6. So he remembers this and rehearses exactly as he would have seen at school AEoff, doesn’t hear 7. This is a spontaneous video clip which is strong clinical evidence and I find fasciniating