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Weighting of acoustic cues shifts to frication duration in identification of fricatives/affricates when auditory properties are degraded due to aging

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K. Yasu, T. Arai, K. Kobayashi and M. Shindo, “Weighting of acoustic cues shifts to frication duration in identification of fricatives/affricates when auditory properties are degraded due to aging,” In Proc. of the Interspeech, 3152−3156, Lyon, 2013.

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Weighting of acoustic cues shifts to frication duration in identification of fricatives/affricates when auditory properties are degraded due to aging

  1. 1. Weighting of acoustic cues shifts to frication duration in identification of fricatives/affricates when auditory properties are degraded due to aging Keiichi Yasu, Takayuki Arai, Kei Kobayashi, Mitsuko Shindo Sophia University 2013/08/29 1
  2. 2. Degradation of auditory property by aging • Difficulty in consonant identification by elderly people • Degradation of auditory property is one of the causes – Elevation of hearing levels – Deficit of temporal resolution – Loudness recruitment • And so on. 2013/08/29 2
  3. 3. Identification of fricative and affricate (CV) • Extending total duration of fricatives (T) → Identification shifts from affricates to fricatives. • (Howell and Rosen, 1983; Kluender and Walsh, 1992) 2013/08/29 3 T (ms) 60 80 100 120 140 160 180 200 Gradient of amplitude of frication: ⊿ Total duration of frication: T Young Elderly
  4. 4. Identification of fricative and affricate (VCV) • Extending silent interval (SI) between V1 and C -> Identified from fricative to affricate – (Dorman et al.,1980; Gordon-Salant et al., 2006) 2013/08/29 4 SI (ms) 0 20 40 60 80 100 # 1 2 3 4 5 6 Total duration of frication: T Silent interval: SI Young Elderly
  5. 5. Weighting shift • Multiple cues exists: – Longer T tend to perceived as fricative – Shorter SI tend to perceived as fricative – Shorter T tend to perceived as affricate – Shorter SI tend to perceived as fricative • Confusing condition – Depends on listeners perception – Weighting of cues shifts especially for elderly listeners (Yasu et al. 2011, 2012) 2013/08/29 5 cue-trading (Repp et al. 1978) typical consonant
  6. 6. Goal • Identification tests of fricative and affricate – Degradation of auditory property by aging • (Yasu et al., 2011, 2012, Gordon-Salant et al., 2006) • The weighting of acoustic cues – Re-analysis and discussing in this study • Weighting Shift to Total duration of frication T – Unified in different cues in CV and VCV stimuli in simple framework 2013/08/29 6
  7. 7. Experiments (Yasu et al. 2011, 2012) • Participants – 19 young listeners and 55 elderly listeners – Auditory property measurement for elderly listeners • Absolute threshold (f), temporal resolution (t), loudness recruitment (r) • Stimuli – Continuum of CV (changing gradient of amplitude and T) – Continuum of VCV (changing SI and T) • Procedure – 2AFC 2013/08/29 7
  8. 8. Result of CV: Gradient and T 2013/08/29 8 Responserateof[∫] 1.0 0.5 0 Gradient of frication 1.0 0.5 0 20 80 140 200 T (ms) Phonetic boundary
  9. 9. Phonetic boundary (p=0.5) in CV 2013/08/29 9 Gradientoffrication T (ms) 1.0 0.5 0 0 100 200 Eftr
  10. 10. Weighting shift from gradient to frication duration T • Elderly listeners with a degradation in auditory properties are less influenced by the gradient of the amplitude of frication • Aging and degradation of auditory properties affect cue trading 2013/08/29 10 Group Y E Eftr θ [deg] 85.2 90.8 89.5 Angle θ [deg] at phonetic boundary
  11. 11. Result of VCV: SI and T 2013/08/29 11 Responserateof[∫] 1.0 0.5 0 T (ms)SI (ms) 0 short middle long 30 60 90 Phonetic boundary
  12. 12. Phonetic boundary (p=0.5) in VCV 2013/08/29 12T (ms) SI(ms) 0 short middle long 50 100
  13. 13. Weighting shift from SI to frication duration T • Elderly people with auditory degradations tend to clue into frication duration T, increasingly as the auditory degradations complete, rather than SI 2013/08/29 13 Group Y E Eftr θ [deg] 30.1 25.3 80.5 Angle θ [deg] at phonetic boundary
  14. 14. General discussion and conclusion • Weighting shifts to the total duration of frication (T) by aging – CV: gradient of frication(⊿) to total duration (T) – VCV: silent interval (SI) to total duration (T) • Possible to unify into single framework -> Total duration of frication – for identification of fricative and affricate 2013/08/29 14 Acknowledgment: Sophia University Open Research Center from MEXT, Japan

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