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Pitch contour identification with combined place and temporal cues using cochlear implants
Xin Luo1, Monica Padilla, David M Landsberger
1Department of Speech, Language, and Hearing Sciences, Purdue University, 500 Oval Drive, West Lafayette, Indiana 47907, USA. luo5@purdue.edu
The Journal of the Acoustical Society of America
|February 23, 2012
Summary
Cochlear implant (CI) users effectively integrate place and temporal pitch cues for pitch contour identification. Coordinating these cues improves dynamic pitch information transmission for better hearing.
Area of Science:
- Auditory Neuroscience
- Speech and Hearing Sciences
- Biomedical Engineering
Background:
- Cochlear implants (CI) aim to restore hearing by stimulating the auditory nerve.
- Pitch perception in CI users relies on processing both place-based and temporal-based acoustic information.
- Understanding how these cues are integrated is crucial for optimizing CI sound processing strategies.
Purpose of the Study:
- To investigate the integration of place- and temporal-pitch cues in pitch contour identification (PCI) for cochlear implant users.
- To determine how the combination of different pitch cues affects the perception of pitch changes.
- To provide insights for improving dynamic pitch information transmission in cochlear implants.
Main Methods:
- Participants judged the direction of pitch contours (rising or falling) created using place-pitch (current steering) and temporal-pitch (AM frequency) cues, individually and combined.
- Psychometric functions were analyzed to assess sensitivity and integration of cues.
- The percentage of rising responses was recorded as a function of cue manipulation.
Main Results:
- A significant correlation was found between sensitivity to current steering and AM frequency change.
- Integration of place and temporal pitch cues was most effective when both cues were similarly discriminable.
- Pitch contour identification was significantly better with consistent, rather than inconsistent, combined cues.
Conclusions:
- Cochlear implant users effectively integrate place- and temporal-pitch cues in relative pitch perception.
- Coordinating current steering and AM frequency changes is recommended to enhance dynamic pitch information for CI users.
- This research informs the development of more effective CI signal processing strategies.
Related Concept Videos
01:21Perceiving Loudness, Pitch, and Location
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
01:13The Cochlea
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
01:15Auditory Pathway
Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
01:31Hearing
When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
01:17Auditory Perception
The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...