Abstract
The stimuli used in the two studies were trains of biphasic current pulses delivered to pairs of the ten electrodes implanted in the patient's scala tympani. The first study investigated the perceptual dissimilarities of ten two-electrode stimuli by the method of triadic comparisons. Electrode separations from 1.5–10.5 mm were used. A nonmetric multi-dimensional scaling analysis of the data obtained showed a two-dimensional solution to be appropriate with dimensions corresponding to the position of: (i) the more basal electrode, and (ii) the more apical electrode of the combinations. In the second study, pulse period discrimination was assessed for a set of two-electrode combinations in a same-different task. Electrode separations from 3–9 mm were used. Analysis using nonparametric indices of discriminability and response bias showed that the discrimination improved with increasing electrode separation, and for constant separation discrimination was better for more apical combinations.
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