Essay Title: 

Auditory steady state response to multiple stimuli

March 24, 2016 | Author: | Posted in east european studies, history

Introduction

Non-behavioral tests became in use in the 1970 ‘s with the development of the auditory brainstem response (ABR . The testing method became popular in the 1980 ‘s and revolutionized audiometric testing methods . The method however had its weaknesses : it is often difficult to record and record near threshold levels , it provides limited information regarding the nature of hearing loss , it requires extensive multiple testing and interpretation of response are subjective (Cone-Wesson et al , 2002

Another testing method that became popular was through otoacoustic emissions (OAE ‘s . In the 1990 ‘s [banner_entry_middle]

, OAE ‘s were utilized to asses frequency-specific responses of outer hair cells but the test can not be utilized to establish the degree of hearing loss (Batterjee and Dutt 2005 ,

. 2 .However , the test has proven its use in hearing screening for infants and its still is used extensively today due primarily to its high degree of objectivity in testing cochlear function . To address the limitations of ABR and OAE , a more comprehensive testing methodology was evolved and the result was the development of ASSR

Though auditory steady-state response (ASSR ) testing is still in its infancy , it has already shown itself to be a promising audiometric diagnostic and clinical tool . Acoustic reflexes or behavioral measures in audiometric testing may be problematic with patients who are unable to provide deliberate response to stimuli such as infants , mentally disabled and otherwise incapacitated , whether deliberate or not (Batterjee and Dutt , 2005 . In these situations , there is a need for a dependable audiogram to reveal true hearing thresholds across various frequencies to facilitate diagnosis and treatment

Delineating of Auditory Steady State Response

Auditory Evoked Potential (AEP ) stimulates the brain to react to auditory stimuli that can either be transient or steady-sate in nature Transient AEP ‘s such as ABR ‘s respond to stimuli momentarily and infrequently . The frequency of responses may also vary during testing with repetition . Steady-state AEP is a reaction to recurring stimuli that are sustained by a continuous amplitude and phase during testing The result is a response whose waveform from the brain is identical to the waveform of the stimulus creating a cycle of stimulus and response explicit to the testing frequency or a steady-sate evoked potential (SSEP ) known as ASSR (Hall , 2000

Development

ASSR traces its development from the 40Hz event related potential (ERP studies conducted in the 1980 ‘s is a steady . 40Hz ERP is an example of steady-state response produced through stimulation at the rate of 40 times per second (Batterjee and Dutt , 2005 ,

. 4 . The method promised to be a dependable estimation tool to define low frequency hearing thresholds which was a limitation of ABR . The drawback to it however was its vulnerability to sleep and attention preconditions and undependable application to newborn testing (Hall , 2000

Researches in the 1990 ‘s suggested the use of higher modulated audiometric systems . One of the main objectives was to develop steady-state response tools that can estimate frequency-specific hearing in infants which were estimated to be over… [banner_entry_footer]

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