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Speech Testing

Speech Testing. Wave 4 EJB 17/05/04. Speech tests. To inform on quality of hearing aid fitting Tradition of neglect Falls between audiology and habilitation Particularly in Pre School HA User Used more by CI teams. Areas of Interest. Detection Discrimination Word recognition

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Speech Testing

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  1. Speech Testing Wave 4 EJB 17/05/04

  2. Speech tests • To inform on quality of hearing aid fitting • Tradition of neglect • Falls between audiology and habilitation • Particularly in Pre School HA User • Used more by CI teams

  3. Areas of Interest • Detection • Discrimination • Word recognition • Speech understanding

  4. Sound Detection • One example is the Ling 5 (or 6!!) sounds oo - ah - ee - (mm) - sh – ss • Gives information across the speech frequency range • Auditory Speech Sound Evaluation (ASSE)

  5. Sound Discrimination • These tests should provide information useful for hearing aid fitting and possibly fine tuning • But no research to suggest exactly how fittings might be altered by speech test scores • Examples (Closed set tests) • McCormick Automated Toy Test • CCT (Consonant Cluster Task) • Maltby Speech Perception Test • Manchester Picture Test • FAAF

  6. Word Recognition Examples Open set word tests • Manchester Junior words • Cambridge junior words • AB word lists

  7. Speech Understanding Examples Sentence Tests • BKB sentence lists • ?Familiarity

  8. First wave evaluation study 3 (mild-moderate-severe, age 7-15) used FAAF (Four Alternative Auditory Feature Test developed by Haggard and Foster 1987) In study 7 (severe/profoundly deaf group) if child was unable to perform on FAAF at above chance levels, The CCT (Consonant Cluster Task further developed by Marriage) was used. “Standardised” test conditions through a calibrated system were important First Wave Evaluation

  9. Difference between analogue and DSP p>0.0001

  10. Speech Testing Issues • Acclimatisation • Familiarity of material • Degree of Hearing Loss (esp Severe/Profound) • Uses – Counselling ? • Uses - Fine tuning ? • Uses – Changes to HA Provision ? • Further work required (esp Pre School) • Calibration/Test Parameters • First wave – ambivalent

  11. Auditory Speech Sound Evaluation(ASSE) Test

  12. Auditory Speech Sound Evaluation • Govaerts PJ, Belgium www.deoorgroep.net • ASSE is a set of supraliminal auditory tests • Test children with no or very limited speech • Part of Paediatric Auditory Performance Test • A speech and language independent test to measure the supraliminal auditory capacity • All sounds that are used are balanced speech sounds common in many languages

  13. Consonant Cluster Task (CCT) Test(Demo)

  14. Consonant Cluster Task (CCT) • Further developed by Marriage • The test involves 4 alternative monosyllabic real words represented by pictures. They have the same vowel but different consonants e.g. “hen, peg, bed, egg” • There are 9 blocks of 6 presentations • The test can be given in quiet or competing noise conditions, and input level can be changed. • There were no significant differences using this or FAAF in Study 7, the children did score better on the DSP hearing aids, but numbers were small so not significant.

  15. CCT Application • Closed Set, 4 Alternative Picture Based Test • Familiar Material from Reed Test • Nonsense/Non Words excluded • All 4 items have same vowel sound • E.g. “Owl”, “House”, “Cow”, “Mouse” • Easier contrasts than APT1 • CCT from ? age 3 years

  16. CCT Presentation • Level should avoid floor (score < 25%) or ceiling (score > 95%) effects • Performance/intensity function may be steep • Useful to test at conversation (e.g. 65 dB) quiet (e.g. 50 dB) and loud (e.g. 80 dB) levels • Pre-recorded better than live presentation for comparison (? not viable for young children) • Can be presented in speech shaped noise at an appropriate speech/noise ratio

  17. CCT Test Procedure • CD Player & 2 Channel Audiometer + Loudspeaker • Speech Channel 1 & Noise Channel 2 • Calibrate using Track 1 • Picture Card 1- familiarise with live voice • Start CD • Each Picture Card • 6 presentation each picture card • Score on confusion matrix score sheet

  18. CCT Interpretation • Total number of correct responses • Observation of errors in confusion matrix • Assess difficulty child has discrimination

  19. APT1 Application • Closed Set, 4 Alternative Picture Based Test • All 4 items have same vowel sound • E.g. “Boat”, “Coat”, “Goat”, “Note” • More difficult contrasts than CCT • 2 Sets Vowel & 8 Consonant confusion contrast • APT1 from ? age 5 years

  20. Four Alternative Auditory Feature (FAAF) Test(Demo & Practical)

  21. FAAF Test • A speech in noise test to measure speech intelligibility, and benefit from a hearing aid. • Different speech levels and speech:noise ratios • The test is presented in a sound field room, from a loudspeaker 1.5m in front of the patient. • The test can be carried out unaided in two interleaved conditions, and aided in four interleaved conditions. • Responses can be via a touch screen

  22. FAAF Equipment • FAAF Software (available from IHR) • Laptop computer • Compatible Sound Card (internal or USB) • Suitable loudspeaker (and external amplifier) • Child-friendly mouse or... • Touch Screen hardware/software (e.g. KeyTech ca £150)

  23. FAAF Parameters • Parameters for test can be changed • May reduce test time • Exercise caution • Effect of noise reduction systems on DSP aids

  24. FAAF Parameters • Can edit .ini file in program directory “4” is default, “0” will mean no feedback for incorrect answer (shorten test, less “negative” for child) Time (ms) that noise is on before speech (default is 500)

  25. FAAF Suggested Instructions • Four words will appear on the screen • You will hear “Can you hear X clearly?” where X is a simple word • Touch / use the mouse to indicate the word you think you heard • This will be repeated but with a different word • If you are not sure, try and choose the word you think was said • There will be noise in the background most of the time, try to ignore it • “Touch here to continue” will appear after each set of 4 sentences • When you see this, it means that the speech and/or noise will get quieter or louder so be prepared for this • This isn’t a “test” and it can be difficult even for someone with good hearing

  26. Typical FAAF Screen • Grey item is child’s response • Green item is correct answer

  27. FAAF Aided Test • This test contains 80 sentences • 20 Sentences in each condition • Condition 1 S:N=+10 S=60 N=50 • Condition 2 S:N=+5 S=60 N=55 • Condition 3 S:N=+10 S=70 N=60 • Condition 4 S:N=+5 S=70 N=65 • Note scores on test form / PMS

  28. FAAF Typical Data Log File • Summarise test parameters (.ini file) used • Records test items,levels,responses for each presentation

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