Acoustic reflex latency threshold sheets

What does acoustic reflex threshold measure? It refers to a middle ear measurement of stapedius muscle response to higher intensity and adequate duration sounds for individual frequencies. Thresholds are usually determined in response to stimuli of 500, 1000, 2000 and 4000 Hz.

The acoustic reflex threshold is usually 10-20 dB below the discomfort threshold. However the discomfort threshold is not a relevant indicator of the harmfulness of a sound: industry workers tend to have a higher discomfort threshold, but the sound is just as harmful to their ears.

hearing threshold below 60 dB. However, thc appli- cation of ART criteria to hcaring thresholds bascd on the mean of three or four frequcncics scems inappro- priate, as Silman & Gelfand (1981) havc shown that the acoustic reflex threshold at a particular frequency is largcly dcpcndcnt on the specific hearing threshold at thc activator frequency. Latency was found to vary in two out of 23 ears, from one reflex response to the other, over a range of 25 ms at most. Onthe other hand, reflex latency depends on stimulus intensity, growing shorter with higher intensities (Metz, 1951) and varying from about 150 ms near threshold to 25 msat high stimulus

In this context let us have a brief review of acoustic reflex followed by acoustic reflex latency. Acoustic Reflex Threshold. The Acoustic Reflex Threshold (ART) is the lowest intensity of an acoustic stimulus at which a minimal change in the middle ear compliance can be measured. Automatic and manual tympanometry, acoustic reflex threshold, decay and latency examinations, ETF for intact and perforated eard CLINICAL MIDDLE EAR ANALYZER Clarinet is a clinical middle ear analyzer, featured with all the tests needed for a deep and accurate investigation of middle ear disorders. Clarinet is a clinical middle ear analyzer, featured with all the tests needed for a deep and accurate investigation of middle ear disorders. Automatic and manual tympanometry, acoustic reflex threshold, decay and latency examinations, ETF for intact and perforated eardrums, high frequency and multi-component tympanometry are all available and full results can be observed on a wide color touch ... The strength of the stapedial contraction increases as the stimuli increases (above reflex threshold) and the latency (of the contraction) decreases from typical threshold responses of some 100 milliseconds to 25 milliseconds for stimuli of higher intensity. hearing threshold below 60 dB. However, thc appli- cation of ART criteria to hcaring thresholds bascd on the mean of three or four frequcncics scems inappro- priate, as Silman & Gelfand (1981) havc shown that the acoustic reflex threshold at a particular frequency is largcly dcpcndcnt on the specific hearing threshold at thc activator frequency.