Related Experiment Video
Updated: Jan 24, 2026
06:04
Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
776
Binaural unmasking with temporal envelope and fine structure in listeners with cochlear implants
Ann E Todd1, Matthew J Goupell2, Ruth Y Litovsky1
1Waisman Center, University of Wisconsin-Madison, 1500 Highland Avenue, Madison, Wisconsin 53705, USA.
The Journal of the Acoustical Society of America
|June 3, 2019
Summary
Cochlear implant users benefit from temporal fine structure in electrical pulse timing for better sound perception in noise, especially at lower pulse rates. This suggests a trade-off between temporal envelope and fine structure information for hearing.
Area of Science:
- Auditory Neuroscience
- Signal Processing in Hearing
- Cochlear Implant Technology
Background:
- Normal-hearing listeners utilize both temporal envelope and fine structure for binaural unmasking.
- Cochlear implant listeners primarily benefit from temporal envelope information, with the role of temporal fine structure encoded in electrical pulse timing less understood.
- Understanding temporal fine structure's contribution is crucial for improving cochlear implant sound processing.
Purpose of the Study:
- To investigate the impact of encoding temporal fine structure (TFS) in electrical pulse timing (PT) on binaural unmasking in bilateral cochlear implant (CI) listeners.
- To compare the contribution of TFS versus temporal envelope information for binaural hearing in CI users.
- To examine how different pulse rates affect the benefit of TFS encoding.
Main Methods:
- Bilateral, synchronized single-electrode stimulation was used in CI listeners.
- Signal detection thresholds were measured under diotic and dichotic conditions.
- Stimuli included temporal envelope alone (constant-rate pulses) and temporal envelope with TFS encoded in PT.
- Normal-hearing listeners were tested with simulated CI stimulation.
Main Results:
- CI listeners demonstrated significantly greater binaural unmasking at 125 pulses per second (pps) when TFS was encoded in PT compared to when it was not.
- No significant effect of TFS encoding was observed at 250 pps.
- Normal-hearing listeners showed a similar pattern with simulated CI stimulation.
Conclusions:
- Encoding temporal fine structure in electrical pulse timing enhances binaural unmasking in cochlear implant listeners at lower pulse rates (e.g., 125 pps).
- A trade-off exists between interaural information from the temporal envelope and temporal fine structure encoded in pulse timing at low stimulation rates.
- These findings have implications for optimizing signal processing strategies in cochlear implants to improve speech perception in noise.
Related Concept Videos
01:18Outer Layers of the Cell Envelope
979
The outermost layers of prokaryotic cells play a critical role in their survival, virulence, and interaction with the environment. These layers, often composed of polysaccharides, polypeptides, or proteins, form protective and adhesive structures that vary in organization and function.Capsules and Slime LayersCapsules are highly organized, tightly bound layers that firmly attach to the bacterial cell wall. Capsules are usually made of polysaccharides, though some are made of polypeptides. These...
979
01:15Fineness of Cement
487
The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
Direct...
487
01:19Fineness Modulus
1.5K
The fineness modulus (FM) of aggregate is a numerical index that measures the coarseness or fineness of the particles. It is calculated by adding the cumulative percentages of aggregate retained on each of a specified series of sieves and dividing the sum by 100.
Consider performing sieve analysis on sand through a set of ASTM sieves. The weight of aggregate retained in each sieve and pan placed at the bottom is recorded, as given in Column B of Table 1.
To determine the fineness modulus of...
Consider performing sieve analysis on sand through a set of ASTM sieves. The weight of aggregate retained in each sieve and pan placed at the bottom is recorded, as given in Column B of Table 1.
To determine the fineness modulus of...
1.5K
00:56Viral Structure
74.1K
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
74.1K
01:15Techniques of therapeutic communication I: Active Listening, Sharing Observations, Validation, and Using Touch
7.4K
The history of therapeutic communication can be traced back to Florence Nightingale, who emphasized the importance of developing trusting relationships with patients. She taught that the presence of nurses with patients results in therapeutic healing.
Therapeutic communication is not the same as social interaction. Social interaction has no goal or purpose and consists of casual information sharing, whereas therapeutic communication has a plan or purpose for the conversation. Therapeutic...
Therapeutic communication is not the same as social interaction. Social interaction has no goal or purpose and consists of casual information sharing, whereas therapeutic communication has a plan or purpose for the conversation. Therapeutic...
7.4K
01:10¹H NMR of Labile Protons: Temporal Resolution
1.7K
Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
1.7K