This study aims to investigate the effect of stimulation parameters and different electrode modes on speech perception in adult cochlear implant recipients.
Performance of four programs (MAPs), each with a different rate, PW and stimulation mode were evaluated, all using 8 maxima: (i) 900 Hz rate, 25 µs PW Default (ii) 900 Hz rate, 50 µs PW LP1, (iii) 500 Hz rate, 100 µs PW LP2 all using Monopolar stimulation mode, and (iv) 500 Hz rate, 100 µs PW using an investigational stimulation mode LP3
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
20
Each MAP uses a specific combination of stimulation parameters and electrode mode.
Each MAP uses a specific combination of stimulation parameters and electrode mode.
Each MAP uses a specific combination of stimulation parameters and electrode mode.
Cochlear Macquarie
Macquarie Park, New South Wales, Australia
Paired Mean Difference Score for CNC Words Correct Between Default and LP1 MAPs in Quiet
Speech perception in quiet was measured for each MAP using recorded CNC monosyllabic words. The goal of speech perception assessment in quiet was to compare % words correct for each of the conditions. The minimum score is 0% and maximum sore is 100%. A higher score means a better outcome. An average CNC word score for each MAP was calculated by combining the data from the specified timepoints.
Time frame: 10 participants completed this test at Week 4, and 10 participants completed this at week 8
Paired Mean Difference Score in dB SRT (AuSTIN) Between Default and LP1 MAPs in Noise
Speech perception in noise was measured using the Australian Speech Test in Noise (AuSTIN), which is a test that uses recorded BKB-like target sentences. The goal of the speech perception test in noise is to provide the Speech Reception Threshold (SRT) in dB for 50% speech intelligibility (dB SRT) There is no minimum score. The maximum score is 15 dB. A lower score means a better outcome. An average SRT score for each MAP was calculated by combining the data from the specified timepoints.
Time frame: 10 participants completed the test at Week 4, 10 participants completed the test at Week 8
Paired Mean Difference Score for CNC Words Correct Between LP1 and LP2 MAPs in Quiet
Speech perception in quiet was measured for each MAP using recorded CNC monosyllabic words. The goal of speech perception assessment in quiet was to compare % words correct for each MAP. The minimum score is 0% and maximum sore is 100%. A higher score means a better outcome. An average CNC word score for each MAP was calculated by combining the data from the specified timepoints.
Time frame: 10 participants completed the test at Week 4, 10 participants completed the test at Week 8
Paired Mean Difference Score in dB SRT (AuSTIN) Between LP1 and LP2 MAPs in Noise
Speech perception in noise was measured using the Australian Speech Test in Noise (AuSTIN), which is a test that uses recorded BKB-like target sentences. The goal of the speech perception test in noise is to provide the Speech Reception Threshold (SRT) in dB for 50% speech intelligibility (dB SRT) There is no minimum score. The maximum score is 15 dB. A lower score means a better outcome. An average SRT score for each MAP was calculated by combining the data from the specified timepoints.
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Each MAP uses a specific combination of stimulation parameters and electrode mode.
Time frame: 10 participants completed this test at Week 4, and 10 participants completed this at week 8
Paired Mean Difference Score in Percentage CNC Words Correct Between LP1 and LP3 MAPs in Quiet
Speech perception in quiet was measured for each MAP using recorded CNC monosyllabic words. The goal of speech perception assessment in quiet was to compare % words correct for each of the conditions. The minimum score is 0% and maximum sore is 100%. A higher score means a better outcome. An average CNC word score for each MAP was calculated by combining the data from the specified timepoints.
Time frame: 10 participants completed this test at Week 4, and 10 participants completed this at week 8
Paired Mean Difference Score in dB SRT (AuSTIN) Between LP1 and LP3 MAPs in Noise
Speech perception in noise was measured using the Australian Speech Test in Noise (AuSTIN), which is a test that uses recorded BKB-like target sentences. The goal of the speech perception test in noise is to provide the Speech Reception Threshold (SRT) in dB for 50% speech intelligibility (dB SRT) There is no minimum score. The maximum score is 15 dB. A lower score means a better outcome. An average SRT score for each MAP was calculated by combining the data from the specified timepoints.
Time frame: 10 participants completed this test with at Week 4 and 10 participants completed this at week 8
Switching Acceptability Rating Between LP2 and LP3 MAPs
Participants rated the sound quality when switching between the LP2 and LP3 MAPs with the investigator asking the question: How does the sound quality of the new program compare with the previous program in terms of sound quality? The possible responses being "very different, somewhat different, similar, or the same". The number of participants in each category will be reported.
Time frame: 10 participants were evaluated at week 4 and 10 participants were evaluated at week 8