Absolute identification of electric pulse rates and electrode positions by cochlear implant patients

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Abstract
In a single interval task, multichannel cochlear implant patients were asked to identify the members of a set of 7 electric stimuli differing in electric pulse rate or electrode position. The perceptual sensitivity index (d'') between successive stimuli in a stimulus set was calculated from the confusions among the 7 stimuli. The pulse rate above which the identification task became difficult varied from 200-600 pps [pulses/s] from patient to patient. For the identification of the positions of 7 bipolar electrode pairs, d'' measures for stimulus sets differing in spatial separation or spatial extent were compared. Spatial separation is defined as the fixed distance between the 2 basal (or apical) electrodes of 2 successive bipolar electrode pairs in a stimulus set, while spatial extent is defined as the fixed distance between the apical and basal electrodes of each bipolar electrode pair in a stimulus set. Perceptual performance improved in an orderly way with spatial separation, but was not significantly affected by spatial extent.

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