2. Perceptual Weighting Strategies in Normal Hearing and Hearing Impaired Children and Adults Andrea Pittman, Ph.D. Patricia Stelmachowicz, Ph.D. Dawna Lewis, M.A. Brenda Hoover, M.A. Boys Town National Research Hospital Funded by a grant from NIH

3. How do hearing-impaired children learn to perceive speech? Hearing impaired: receive reduced speech signal Hearing- Impaired Children Hearing Hearing- Impaired Adults Normal- Hearing Children Normal- Hearing Adults Experience Children: less experience perceiving speech

4. SA How do hearing-impaired children learn to perceive speech?

5. Subjects Normal Hearing 10Adults (mean = 28 yrs, 20-44) 20Children (mean = 6:8 yrs, 5-7) Hearing Impaired 10 Adults (mean = 59 yrs, 49-66) 10 Children (mean = 7:8 yrs, 5-10)

6. Subjects Normal Hearing 10Adults (mean = 28 yrs, 20-44) 20Children (mean = 6:8 yrs, 5-7) Hearing Impaired 10 Adults (mean = 59 yrs, 49-66) 10 Children (mean = 7:8 yrs, 5-10)

7. Stimuli Sack Sock Shack Shock u 4 words –CVC –2 vowels –2 fricatives

8. Stimuli Sack Sock Shack Shock u 2 conditions –w/ transition –w/o transition

9. Stimuli Sack Sock Shack Shock u 2 conditions –w/ transition –w/o transition

10. Stimuli w/o transition w/ transition u 2 conditions –w/ transition –w/o transition

11. Stimuli u 2 segments –fricative –vowel Sack Sock Shack Shock

12. Stimuli u 2 segments –fricative –vowel Sack Sock Shack Shock

13. Stimuli Frequency (Hz) Level (dB SPL) u 5 levels –5 to 12 dB steps –20 to 48 dB range

14. Stimuli Frequency (Hz) Level (dB SPL) u 5 levels –5 to 12 dB steps –20 to 48 dB range

15. Stimuli Frequency (Hz) Level (dB SPL) u 5 levels –5 to 12 dB steps –20 to 48 dB range

16. Stimuli Frequency (Hz) Level (dB SPL) u 5 levels –5 to 12 dB steps –20 to 48 dB range

17. Stimuli Frequency (Hz) Level (dB SPL) u 5 levels –5 to 12 dB steps –20 to 48 dB range

18. Stimuli Frequency (Hz) Level (dB SPL) u 5 levels –5 to 12 dB steps –20 to 48 dB range

19. Stimuli Frequency (Hz) Level (dB SPL) u 5 levels –5 to 12 dB steps –20 to 48 dB range

20. Stimuli Frequency (Hz) Level (dB SPL) u 5 levels –5 to 12 dB steps –20 to 48 dB range

21. Stimuli Frequency (Hz) Level (dB SPL) u 5 levels –5 to 12 dB steps –20 to 48 dB range

22. Stimuli Frequency (Hz) Level (dB SPL) u 5 levels –5 to 12 dB steps –20 to 48 dB range

23. Performance Short-Term Audibility

24. Performance Short-Term Audibility

25. Performance Short-Term Audibility

26. Performance Short-Term Audibility

27. Performance Short-Term Audibility

28. Performance Short-Term Audibility

29. Performance

30. Short-Term Audibility Performance

31. Results

32. Normal-Hearing Adults Short-Term Audibility Performance w/ transition w/o transition

33. Normal-Hearing Adults Short-Term Audibility Performance w/ transition w/o transition

34. Hearing-Impaired Children Short-Term Audibility Performance Hearing-Impaired Adults Short-Term Audibility Performance Normal-Hearing Children Short-Term Audibility Performance w/ transition w/o transition Normal-Hearing Adults Short-Term Audibility Performance

35. Hearing-Impaired Children Short-Term Audibility Performance Hearing-Impaired Adults Short-Term Audibility Performance w/ transition w/o transition Normal-Hearing Adults Short-Term Audibility Performance Normal-Hearing Children Short-Term Audibility Performance

36. Conclusions Experience -Overall performance and use of the transition increased with age Hearing -HI adults showed significantly poorer performance when the transition was removed Suggests that the transition was more important to perception in this group than in NH listeners -HI children showed no difference in performance for words with and without a transition