COURSE NUMBER: RHS 371 Level: V Credit:2+1=3
COURSE TITLE: AUDIOLOGY I
COURSE INSTRUCTOR: Dr.RAVISHANKAR, K.C.
COURSE DESCRIPTION: An introduction to the field of Audiology; phenomenon of hearing, theories of hearing, acoustics, decibel scale. Basic pure tone and speech audiometric procedures; pathologies of the auditory system and hearing disorders.
OBJECTIVES: To enable the students to understand the fundamental concepts of the field of Audiology and to under stand various methods of audiometric assessment and interpretation of hearing test results. Use of the instrumentation in assessment of hearing.
WEEK I Audiology ; introduction, historical developments, review of the anatomy and physiology of the hearing mechanism, electrical potentials of the cochlea and central auditory pathway.
WEEK 2 Theories of hearing. Hearing by air conduction. Hearing by bone conduction and theories of bone conduction.
WEEK 3 Frequency, intensity and quality of sound’ their psychological correlates, phons and sones, equal loudness contours, perception of loudness, Webers law, Fechners law and Stevens power law.
WEEK 4 Concept of decibel (dB), power and pressure formulae and the importance of decibel.
WEEK 5 Zero db, calculation of SPL, dBSPL, DBIL and DBSL. DBHL and the reference for audiometers.
WEEK 6 Absolute threshold and DL. Minimum audibility curve (MAC), relationship between MAP and MAF. Calibration of the audiometer ASA, ANSI and ISO norms.
WEEK 7 Hearing loss, definition and classification of types of hearing loss. Congenital VS acquired types.
WEEK 8 Tuning fork tests. Rinne, Weber and Schwabach tests. Administration and interpretation of the results.
WEEK 9 Pure tone audiometry – Audiometer and parts of an audiometer. Methods of testing in air conduction and bone conduction.
WEEK 10 Permissible noise levels in audiometric rooms. Factors influencing a.c and b.c thresholds.
WEEK 11 Bone conduction testing. Problems in b.c testing – Occlusion effect, Carharts notch, Rainville and SAL tests.
WEEK 12 Masking, definition and types, Inter aural attenuation (IA). Masking in air conduction and bone conduction.
WEEK 13 Clinical masking in a.c and b.c.
WEEK 14 Speech audiometry : historical developments, procedures, methods and stimuli used. Interpretation of results. SDT, SRT and SDS procedures. Issues related to speech audiometry. PB words and Spondees.
WEEK 15 Final exam.
1. NEWBY, H AND POPELKA . AUDIOLOGY, PRENTICE HALL, ENGLEWOOD CLIFFS, NJ.
2. LLOYD, L. L. AND KAPLAN, H. AUDIOMETRIC INTERPRETATION, UNIVERSITY
PARK PRESS, BALTIMORE.