STRUCTURAL AND FUNCTIONAL CONSEQUENCES OF ACOUSTIC OVER-STIMULATION ON THE AUDITORY SYSTE

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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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ALTERNATE BINAURAL LOUDNESS BALANCE TEST(ABLB)

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This technique was initially described by Fowler, 1986, but corresponding modifications were proposed by Hood & Jerger in new course. Currently Fowler’s ABLB is the most preferred and commonly used procedure with Hood & Jerger modifications whereas, the technique or MLB was described by Rager 1936, which is helpful in detecting the recruitment in clients with bilateral hearing loss. ABLB compares loudness growth between 2 different frequencies in the same ear. ABLB is a pure tone test which is done when there is a threshold difference of more than 20 dB between ears at the test frequencies and the better ear is relatively normal.             The purpose of ABLB test is to compare the growth of loudness in an impaired ear with the normal growth of loudness in the opposite / normal ear. Test approach Jerger protocol: In this protocol devised by Jerger tone alters between two ears every 500 millisecond...
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MONAURAL LOW-REDUNDANCY SPEECH TESTS

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Monaural presentation involves the presentation of one message to a single ear at a time. In monaural speech tests, the extrinsic redundancy is reduced by filtering and by time alteration such as compression or interruption. A. LOW-PASS FILTERED Bocca, Calearo, and Cassinari (1954) and Bocca, Calearo., Cassinari, and Migliavacca (1955)  obtained performance-intensity functions for low-pass filtered (cutoff frequency of 500 Hz) lists of PB words in persons with temporal-lobe tumors with normal-hearing threshold levels. They found a contralateral-ear effect (i.e., scores were poorer in the ear contralateral to the side of the temporal-lobe lesion) that was absent (or reduced) when the lists were presented with­out frequency distortion. Similar findings were obtained by  Goldstein  etal.  (1956) , using the Rush Hughes poor-quality (presumably frequency distorted) recordings of PB words, and Jerger (1960a,b,  1964),  using low-pass filtered PAL PB...
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