Electrophysiological Hearing Aid Assessment
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Solution Overview
Problem
Current methods for adjusting hearing aids lack objective measures for evaluating the effectiveness of speech sound processing, particularly in distinguishing acoustically close sounds, which is crucial for language understanding and communication, especially in cases like infants, the elderly, and those with disabilities.
Innovation Solution
A method that uses electrophysiological measurements to evaluate the processing of speech sounds by the auditory nervous system through hearing aids, collecting and comparing subcortical and cortical responses to speech stimuli, allowing for optimization of hearing aid adjustments based on neurophysiological discrimination of linguistic units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If subjective tests (tone and vocal audiometry) are used to adjust hearing aids, then the adjustment can be performed with current clinical methods, but the reliability and reproducibility of the tests deteriorate in cases of extreme ages, associated disabilities, and Down's syndrome
Solution Approach 1:
The patent replaces the mechanical/subjective testing system with an electrophysiological measurement system. Instead of relying on subjective patient responses during tone and vocal audiometry, the system uses objective electrophysiological measurements (such as auditory brainstem response) to evaluate hearing aid effectiveness, eliminating the need for active patient participation while improving reliability for populations unable to participate in subjective tests
Solution Approach 2:
The patent introduces electrophysiological measurements as an intermediary objective indicator between the hearing aid and the patient's subjective experience. This intermediary measurement system provides reliable data about hearing aid performance without requiring direct patient participation, solving the contradiction between reliability and ease of operation
2Measurement precision
If electrophysiological measurements are used to objectively evaluate auditory function, then the reliability of evaluation is improved, but the ability to assess speech sound processing and discrimination deteriorates when using simple sounds (clicks, tonal puffs)
Solution Approach 1:
The patent makes the electrophysiological measurement system dynamic by adapting the stimulus type from simple sounds (clicks, tonal puffs) to speech sounds. This dynamic adaptation allows the system to maintain objective measurement precision while gaining the versatility to assess speech sound processing and discrimination, directly resolving the contradiction between measurement precision and adaptability
Solution Approach 2:
The patent changes the key parameter of the electrophysiological stimulus from simple acoustic signals to speech sounds. This parameter change enables the measurement system to evaluate both objective auditory function and speech sound processing capabilities simultaneously, eliminating the limitation of assessing only simple sound detection
3Loss of information
If cortical Auditory Evoked Potentials are measured to assess hearing aid effectiveness, then language processing information is obtained, but the detailed information on sound representation in the auditory nervous system deteriorates
Solution Approach 1:
The patent segments the electrophysiological response measurement into multiple components, capturing both cortical responses (for language processing information) and subcortical responses (for detailed sound representation). This segmentation allows the system to preserve both types of information simultaneously, resolving the contradiction between obtaining language processing information and maintaining sound representation detail
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables objective evaluation of hearing aid effectiveness in processing speech sounds, improving language understanding by identifying and adjusting for insufficient acoustic feature processing, thereby enhancing communication abilities.
Implementation Method 1
collecting electrophysiological responses to simple sounds (clicks, tonal puffs), synthesized with a conventional electrical signal generator
Data Source
Figure 1
Figure 2A~2D
Figure 2E~2H
AI summary
A method for assessing the effectiveness of a hearing aid. Said method involves: transmitting out a stimulus via a hearing aid, thereby supplying an auditory stimulus to the auditory nervous system of a person provided with said hearing aid; receiving the neurophysiological signals emitted by said auditory nervous system in response to the auditory stimulus by means of an electro- or magneto-encephalography system; processing the received signals; sending out a stimulus consisting of at least one pair of linguistic units selected from a phonetic confusion matrix; separately receiving a neurophysiological signal in response for each linguistic unit; and comparing the signals such as to assess the effectiveness of the hearing aid.