EFFECTS OF NOISE ON SPEECH COMMUNICATION

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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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SPECIAL TESTS OF DIAGNOSTIC AUDIOLOGY

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INTRODUCTION All types of Audiometry are diagnostic since it contributes in some way to the ultimate localization of auditory disorder. For ex. The relationship between AC and BC thresholds is one of the principle tests for differentiating conductive hearing loss from Sensorineural hearing loss. The auditory disorders are broadly classified into: 1.      Peripheral Auditory System 2.      Central Auditory System On these lines, Audiological tests can be divided into 2 categories: 1.      Audiological tests suited to the evaluation of peripheral auditory system 2.      Audiological tests more appropriate to the evaluation of central auditory system. Auditory disorders are broadly classified as central and peripheral on the basis of location of cochlear nuclei i.e. the lesion distal to cochlear nucleus may be said to affect Peripheral Auditory sy...
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