Table 1.

Patterns of electrophysiologic changes with associated intracochlear damage of all 16 animals and 18 ears tested. Two animals underwent bilateral testing (animals #74 and 76). The table categorizes the cases into three types of tracks observed based on physiological patterns (see also Figure 3).The categories are based on changes in the CM, because the CAP was typically stable. The categories were early, irreversible loss of CM, or loss seen unrelated to the advancement of the electrode; late, irreversible loss of CM, or a reduction in the CM that occurred only after electrode advancement and did not recover on electrode retraction; and reversible loss of the CM, where the CM recovered when the electrode was retracted. In some of the RCM cases, after the reversibility was demonstrated the electrode was further advanced until the change became irreversible. Also indicated are the structure impacted and degree of damage

Classification			Animal		Physiology		Histology
Pattern	Description		#	Ear	CM	CAP	Structure	Description
#1	Early irreversible decrease of CM	CAP changes	47	right	I	I	BM/OSL	Full thickness
			38	right	I	I	BM/OSL	Full thickness
			72	right	I	I	BM/OSL	Full thickness
			69	right	I	I	BM	Full thickness
		CAP stable	74	left	I	S	BM	Full thickness
#2	Irreversible CM decrease, CAP stable		65	right	I	S	OSL	Superficial
			76	left	I	S	OSL/BM	Superficial
			67	right	I	S	OSL	Superficial
			29	right	I	S	OSL	Superficial
			36	right	I	S	BM	Full thickness
#3	Reversible CM decrease		41	right	R	S	NA	Absent trauma
			64	right	R	S	OSL	Superficial
			71	right	R	S	OSL	Superficial
	Reversible, then irreversible CM decrease	CAP stable	58	right	R/I	S	OSL	Superficial
			76	right	R/I	S	OSL	Superficial
			74	right	R/I	S	BM	Superficial
			56	right	R/I	S	OSL	Superficial
		CAP changes	31	right	R/I	R/I	BM	Full thickness

Abbreviations: I: irreversible change, R: reversible change, R/I: reversible change, then irreversible change, S: stable.