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System-and-methods-for-objective-evaluation-of-hearing-using-auditory-steady-state-responses

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System and methods for objective evaluation of hearing using auditory steady-state responses

Details

Inventors: John, Michael Sasha; Picton, Terence W.;
Assignee: Baycrest Centre for Geriatric Care (Toronto)
Primary Examiner: Pelham; Joseph
Assistant Examiner:
Attorney, Agent or Firm: Marshall, Gerstein & Borun

This invention relates to an apparatus and method for assessing a subject's hearing by recording steady-state auditory evoked responses. The apparatus generates a steady-state auditory evoked potential stimulus, presents the stimulus to the subject, senses potentials while simultaneously presenting the stimulus and determines whether the sensed potentials contain responses to the stimulus. The stimulus may include an optimum vector combined amplitude modulation and frequency modulation signal adjusted to evoke responses with increased amplitudes, an independent amplitude modulation and frequency modulation signal and a signal whose envelope is modulated by an exponential modulation signal. The apparatus is also adapted to reduce noise in the sensed potentials by employing sample weighted averaging. The apparatus is also adapted to detect responses in the sensed potentials via the Phase weighted T-test or Phase zone technique. The apparatus may further perform a number of objective audiological tests including latency tests, AM/FM discrimination tests, rate sensitivity tests, aided hearing tests, depth sensitivity tests, supra-threshold tests and auditory threshold tests. The apparatus is further adapted to perform multi-modality testing in which more than one sensory modality of the subject is tested simultaneously.

DETAILED DESCRIPTION The present invention is an apparatus for recording SSAEP responses and a set of methods for using the apparatus to test various aspects of a subject's auditory system.
The apparatus comprises hardware to present SSAEP stimuli, to acquire EEG data while simultaneously presenting the SSAEP stimuli, and to analyze the EEG data to detect the presence of SSAEP responses.
The apparatus further comprises software to enable the creation and presentation of the SSAEP stimuli, the acquisition of the EEG data (i.
e.
electrophysiological potentials) and the analysis of the EEG data.
The software further enables displaying the results of ongoing testing and the final results of the test as well as the storage of the test results for subsequent viewing and/or analysis.
The present invention also includes software adapted to effect noise reduction algorithms which may include sample weighted averaging.
The software is also adapted to effect statistical tests that are used to detect the SSAEP responses to the SSAEP stimuli.
These statistical tests may include the phase weighted t-test, the phase zone technique and the modified Rayleigh test of circular uniformity (MRC).
The present invention also uses particular types of SSAEP stimuli to increase the amplitude of the resulting SSAEP responses.
These SSAEP stimuli may include a combined amplitude modulation and frequency modulation signal in which the phase of the frequency modulated signal is adjusted relative to the phase of the amplitude modulated.
These SSAEP stimuli may also include using an exponential modulation signal.
The present invention also uses an SSAEP stimulus consisting of an independent amplitude modulation signal and frequency modulation signal wherein the AM modulation rate is different than the FM modulation rate.
This stimulus evokes two SSAEP responses that can be independently analyzed.
In another aspect of the invention, these SSAEP stimuli can be used for a variety of objective tests such as determining audiometric thresholds and testing the aided and unaided hearing of a subject

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