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SECTION TWO | CLINICAL GUIDANCE

11.It is strongly advised that after every few channels have been added to

the ordered list, to sweep all the ordered channels to check no channel is

incorrectly positioned.

12.In practice, recipients will usually ﬁnd some channels that are so close

in pitch to another channel that they cannot easily be distinguished. It is

recommended to keep a note of any groups of electrodes (not channels, as

these may change throughout this procedure) which sound the same and

then never attempt to compare a new channel with more than one channel

from that group of electrodes.

Creating and testing a Nucleus 24 ABI MAP

To create and test a Nucleus 24 ABI MAP:

1. Deactivate any channels that should not be used. If the number of channels

is below 6 and you select the SPEAK sound processing strategy, consider

‘doubling up’ each channel number on the Set Levels screen to obtain a

better frequency allocation table assignment.

2. Test the live MAP in the sound processor.

3. Globally adjust C-levels and/or T-levels according to the recipient response.

To improve sound quality, you could modify frequency allocation tables,

individual channel gains, number of maxima, deactivate ‘redundant’

channels (i.e. those with very similar pitch percepts), or reorder electrodes.

In all cases, recipient preference should be the main criteria for selection. Test

the recipient’s reaction to simple discrimination tasks. It is often helpful to

read a passage of text (following with your ﬁnger) to help the recipient make

Figure 9 : Nucleus

ABI 24M pitch

ranking worksheet

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