Fig 1.
Mean voltage matrices grouped for each electrode array type (FORM24 n = 2, FLEX24 n = 9, FLEX28 n = 99, FLEXSOFT n = 6, STANDARD n = 19).
T-tests show significant differences in the apical regions. Exemplary the difference between FLEX28 electrode array and FORM19 device are shown. * indicate p<0.05.
Fig 2.
Voltage for each stimulation pair of electrode contacts.
Perimodiolar CMD devices (green) and as example FLEX28 electrode averaged (grey). Error bars indicate the standard errors. The peaks are the values along the matrix diagonal. * indicates p-value < 0.05. Electrodes 3 and 10 are in rectangles because they are used for comparison of apical and basal regions in Fig 3.
Fig 3.
Voltages between the stimulating and adjacent electrode contacts as average across apical (left) and basal (right) stimulating electrode contacts (green: Common electrode arrays, single dots: FORM24, line-dot: FLEX24, dashed line: FLEX28, dotted: FLEXSOFT, solid line: STANDARD, red: CMD).
* indicated statistical difference of electrode type compared to CMD; all other combinations are not significant p>0.05.
Fig 4.
A Distribution of speech scores for all analyzed datasets. B Mean voltage matrices for different monosyllable word recognition score groups of CI users after 3 months, averaged over all common electrode array types. Monosyllable WRS better than 60% (n = 25), 20–60% (n = 78) and less than 20% (n = 31). No statistical difference was found (ps >0.05).
Fig 5.
A Matrices for four patients with a perimodiolar CMD for use after surgical removal of intra-labyrinthine schwannomas (ILS).
Measures after three months are shown. For detailed pictures of electrode array position see Plontke et al. 2020 [21]. B Word recognition score of CMD users. Dotted lines show the 20% and 60% monosyllable WRS line as separation between good and bad performers. ID1: green, ID2: yellow (not German speaking), ID3: red, ID4: blue. The grey line shows the averaged monosyllabic word and the black averaged multisyllabic number score for the CMD. The grey square is the averaged WRS for all users of common electrode array types.