FIG. 14.

Sustained activation widths were narrower for electrical than for acoustic stimuli when peak spike rates were matched to 60-dB SPL acoustic tones. In three guinea pigs, sustained activation widths were significantly narrower for monopolar and bipolar stimuli than for acoustic stimuli (medians and interquartile ranges shown for 18 total electrical stimulus channels and 18 matched acoustic tone frequencies). Bipolar onset activation widths were similar to acoustic. Monopolar onset activation widths, however, had large variability and a trend towards broader activation than acoustic (not significant). For the one normal cat in which acoustic-to-electrical comparisons could be made, trends were similar to those seen in guinea pigs except that bipolar onset activation was more similar to monopolar activation than to acoustic activation. *p < 0.05 relative to acoustic tones. (acoust acoustic tones).