Auditory Effect Of Noise

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THE BUFFALO MODEL

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The Buffalo Model is a conceptualization of auditory processing disorders (APD) based on the results of a three-test battery . Each test takes a different look at auditory processing and together they provide more than 30 indicators that help to identify APD and what types of problems it represents. Audiologists have long been interested in the diagnosis of central auditory disorders; starting in the days when the focus was identifying site-of-dysfunction in patients with brain lesions (Bocca et al., 1954). In the 1970s interest turned to the evaluation of APD in those who have learning and/or communicative problems (Katz & Illmer, 1972). Over the years more and more attention has been directed toward remediation of auditory processing difficulties (Katz & Burge, 1971; Sloan, 1986; Tallal, 1996; Musiek, 1999). First, this article will discuss the Buffalo Battery of tests and relate their results to categories of APD, which in turn will point to therapies and the expected...
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PERFORMANCE INTENSITY PHONETICALLY BALANCE (PIPB)

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The study of relative intelligibility of spondees at different intensity levels is termed as articulation curve. Similarly the study of intelligibility of PB word list at different intensity level is termed as PIPB function or PIPB curve... The study of PIPB function helps in determining the differential diagnosis of cochlea and RCPs. Jerger and Jerger 1971 describe the use of PIPB function as the method of screening for disorders of central auditory nervous system. They observed that patients with normal hearing sensitivity shown the differences in the score as the intensity increased with shapes of PIPB curve goes on increasing with the increase in intensity level upto such level where plateau is reached where there is no improvement in score with further increase in intensity level. This similar curve is also obtained in patients with conductive hearing losses.. However it has been seen that in cases of RCPS as the intensity is increased the score reduces...
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DIFFERENTIAL SENSITIVITY/LIMEN IN

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                    ·       FREQUENCY ·       INTENSITY ·       TIME INTRODUCTION The ear’s extremely wide range of sensitivity is one of the most striking aspects of audition. The ear is sensitive to range of intensities from about 0 dB SPL (which is amplitude of vibration of about size of a hydrogen molecule) to roughly 140 dB (at which pain and damage to the auditory mechanism ensue).This dynamic range of the approximately 140 dB corresponds to pressure ratio of 107:1. In other words, the most intense sound pressure that is bearable is on the order of 10 million times as great as the softest one that is perceivable under optimum listening condition. In terms of frequency, humans can hear tones as low as 2 Hz (although roughly 20 Hz is required for a perception of “tonality”) and as high as about 20 KHz. The frequency and inte...
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