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CLINICAL GUIDANCE | SECTION ONE

The remaining T-levels are automatically interpolated. If you wish to measure

other channels, simply double-click on the speciﬁc channel or click the “make

all channels measurable” button to access the entire array.

• C-level – Comfort Level – the maximum level of stimulation in CL that

does not produce uncomfortably loud sounds (the level that is as loud as a

recipient could listen to comfortably for long periods).

C-level Assessment Procedures

In Custom Sound, you can measure C-levels on all channels simultaneously

using speech (click the “go live” button and then use the increase and decrease

arrows in the “live Cs” section of the Streamlined Programming box) or

you can measure individual channels in psychophysics. Typically, live voice

assessment of C-levels provides a better indication of overall comfortable

loudness in the MAP because all the channels are being stimulated and any

loudness summation effects are taken into account. Alternatively, you can

measure individual channel C-levels by clicking on the “Set Ts and Cs” drop

down menu and choosing “C”. In this case, you measure C-levels using the

same psychophysical stimulus that you use for measuring T-levels. If you prefer

to measure C-levels in this way, it is not necessary to measure every active

channel. You may interpolate between measured C-levels.

• Electrical DR – electrical dynamic range – the difference between C- and

T-level on a given channel.

• Shift – a means of adjusting all T- and/or C-levels simultaneously by an

absolute amount (e.g. 5 CL) or a percentage of the dynamic range for

each channel.

• Sweep – a means of stimulating each active channel sequentially along

the electrode array. During a sweep, you may stimulate the channels at

T- level, C-level or within the DR. Choose from the options in the Sweep

drop-down menu. During the sweep, you can check for any channels

that are too loud or too soft at C-level or within the DR. You can also

observe the recipient for any non-auditory sensations, such as facial

nerve stimulation.

• Balance – a means of comparing loudness perception across the

stimulated channels. You can optimize sound processing for a recipient by

ensuring that sounds at C-level are equally loud across the array. An easy

way to do this is to sweep the active channels in small groups and ask the

person about the loudness of each channel. You can modify individual

C-levels to ensure equal loudness across the array. This activity is generally

only suitable for teenagers or adults.

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Cochlear SPrint Sound Processor Informazioni Techniche Pagina 7