Proefschrift_vd_Beek
100
100
80
80
El 1
El 2
El 3
–18
60
60
40
40
–12
Word score (%)
Word score (%)
20
20
–6
R 2 linear = 0.117
0
0
–24
–18
–12
–6
0
–6
0
6
El 5
El 6 ASM M-level (dB)
El 7
a
b
ASM T-level (dB)
–18
100
100
–12
80
80
–6
60
60
El 9
El 10
El 11
40
40
Word score (%)
Word score (%)
–18
20
20
R 2 linear = 0.109
Measrued T-level (dB) –12
0
0
0
6
12
18
0
6
12
18
c
d
ASV T-level (dB 2 )
ASM DR (dB)
–6
100
100
El 13
El 14
El 15
–18
80
80
60
60
–12
40
40
–6
Word score (%)
Word score (%)
20
20
0
–18
–12 –6 0
–18 –12 –6
–18 –12 –6
0
c
0
6
0
6
Predicted T-level (dB)
e
f
ASV M-level (dB 2 )
ASV DR (dB 2 )
Fig. 4. Word scores vs. the ASM of the T-level ( a ), M-level ( b ) and DR ( c ) as well as vs. the ASV of the T-level ( d ), M-level ( e ) and DR ( f ). Fig. 4. Word scores vs. the ASM of the T-level (a), M-level (b) and DR (c) as well as vs. the ASV of the T-l vel (d), M-level (e) and DR (f).
Fig. 5. c Scatter plot of the measured T-levels vs. predicted T-levels for the rema each electrode. van der Beek/Briaire/Frijns
8
Audiol Neurotol 2015;20:1–16 DOI: 10.1159/000362779
prediction (with a mean correlation coefficient of r = 0.94 over the whole array) was given by the T-level of electrode 7, yielding the following prediction formula: ra ) was given by the T-level of e ectrode 7, yielding the following prediction formula:
predicted T-levels versus the electrode contacts, while tabl numerical data. Again, it is cl slightly better for the center r cedure was repeated with a n lections of 30% of the popu same result. To obtain a T-level profile equation 2 can be reformulat Downloadedby: LeidenUniversity 145.88.209.33 - 11/23/20142:34:38PM
T-level ( electrode ) = 0.01 ( electrode 2 – 7 2 ) + 0.025 ( electrode – 7) + T-level electrode 7 ( in dB ). (2) As shown in figure 5b, the neighboring electrodes in the center of the array provided comparable results, while the mean r was reduced at both ends of the array (to r = 0.86). R-values for electrodes 2, 5, 9 and 14 are not shown in figure 5b, since these electrodes were active in only less than 33% of the subjects (table 3).
As shown in figure 5b, the neighboring electrodes in the center of the array provided comparable results,
102 | Chapter 5
- T level lectrode e
1 0 01
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lectrod
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