Abstract • We review the Short Increment Sensitivity Index (SISI) in terms of its performance with a variety of sites of lesion and its likely physiologic basis. We conclude that its original schema can be broadened to extend its clinical application if changes are made in the parameters of its routine use. The two major changes involve (1) a presentation level of no less than 90 dB hearing threshold level (HTL) and (2) a bimodal interpretation of results based on the premise that high scores indicate normal cochlear function and low scores indicate extensive cochlear damage or neural dysfunction. We suggest that routine use of the modifications suggested here can provide useful diagnostic information and bring to light a group of neurally impaired patients that has been relatively ignored. (Arch Otolaryngol 102:396-399, 1976) References 1. Jerger J, Shedd JL, Harford E: On the detection of extremely small changes in sound intensity . Arch Otolaryngol 69:200-211, 1959.Crossref 2. Jerger J: Diagnostic audiology , in Jerger J (ed): Modern Developments in Audiology . New York, Academic Press, 1973. 3. Owens E: The SISI test and VIIIth nerve versus cochlear involvement . J Speech Hear Disord 30:252-262, 1965. 4. Yantis PA, Decker RL: On the short increment sensitivity index (SISI test) . J Speech Hear Disord 29:231-246, 1964. 5. Young IM, Harbert F: Significance of the SISI test . J Aud Res 7:303-311, 1967. 6. Swisher LP: Response to intensity change in cochlear pathology . Laryngoscope 10:1706-1713, 1966. 7. Swisher LP, Stephens MM, Doehring DG: The effects of hearing level and normal variability on sensitivity to intensive change . J Aud Res 6:249-259, 1966. 8. Hallpike CS: The loudness recruitment phenomenon: A clinical contribution to the neurology of hearing , in Graham AB (ed): Sensorineural Hearing Processes and Disorders . Boston, Little Brown & Co, 1967. 9. Simmons FB: Monaural processing , in Tobias JV (ed): Foundations of Modern Auditory Theory . New York, Academic Press, 1970. 10. Thompson G: A modified SISI technique for selected cases with suspected acoustic neurinoma . J Speech Hear Disord 28:299-302, 1963. 11. Koch LJ, Bartels D, Rupp RR: The use of a "modified" short increment sensitivity index in assessing site of auditory lesion. Read before the American Speech and Hearing Association convention, Chicago, 1969. 12. Lehman RH, Miller AL: Presbycusis . J Am Geriatr Soc 18:486-488, 1970.
Archives of Otolaryngology – American Medical Association
Published: Jul 1, 1976