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Perceptual Differences Between Low-Frequency Analog and Pulsatile Stimulation as Shown by Single- and
Natalia Stupak1, Monica Padilla1,2, Robert P Morse3
11 Department of Otolaryngology, New York University School of Medicine, NY, USA.
Trends in Hearing
|November 1, 2018
Summary
Cochlear implant sound coding strategies significantly impact user perception. Analog stimulation sounds less clean than pulsatile stimulation, indicating distinct auditory information delivery.
Area of Science:
- Audiology
- Biomedical Engineering
- Neuroscience
Background:
- Cochlear implant users often prefer analog over pulsatile sound coding strategies.
- The reasons behind these preferences and performance differences are not fully understood.
- Analog and pulsatile stimulation may convey different auditory information or sound quality.
Purpose of the Study:
- To investigate the perceptual differences between analog and pulsatile electrical stimulation on a single cochlear implant electrode.
- To determine the characteristics of these perceptual differences.
Main Methods:
- Multidimensional scaling (MDS) was used to analyze overall perceptual differences.
- Single-dimensional scaling tasks were employed to assess specific perceptual attributes.
- An experiment was conducted to test the influence of the interpulse gap in pulsatile stimulation.
Main Results:
- Multidimensional scaling revealed significant perceptual differences between analog and pulsatile stimulation.
- Analog stimulation was perceived as less "clean" than pulsatile stimulation.
- These perceptual differences were independent of pitch and the interpulse gap duration.
Conclusions:
- There are substantial perceptual distinctions between analog and pulsatile electrical stimulation in cochlear implants.
- The "cleanliness" of sound is a key differentiator.
- Further research is required to elucidate the precise nature of these perceptual differences and their implications for cochlear implant sound processing.
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