TABLE 2.

Example of calculation of increment and decrement sizes for an individual listener

E	T	C	DR	50% point	50% DR	25% DR	12½% DR
3	100	155	55	128	28	14	7
7	110	165	55	138	28	14	7
11	120	172	52	146	26	13	7
15	120	173	53	147	27	13	7
19	115	175	60	145	30	15	8

All levels are quoted in stimulus units, as delivered by the nucleus CI24 implant. From moment to moment on each electrode, the level of the amplitude envelope was rounded up to the nearest integer value in stimulus units. Note that, in practice, dynamic ranges varied considerably across listeners and electrodes (minimum = 25; maximum = 65)

e electrode number, T threshold level, C maximum comfortable level, DR dynamic range, 50% point level used for “steady state”, 50% DR, 25% DR, 12.5% DR maximum increment/decrement sizes for each percentage of dynamic range tested