Abstract A number of investigators1-19 have recently reported that certain kinds of hearing loss are apparently accompanied by unusually keen differential sensitivity to intensity. Their studies indicated that, in hearing loss due to cochlear lesion, the patient was able to discriminate smaller intensity changes than a listener with normal hearing. Furthermore, many of these investigators made the assumption that the apparent reduction of the intensity difference limen was due to the presence of loudness recruitment in the affected ear. On the basis of this assumed causal relationship, it was proposed that the measurement of the intensity difference limen afforded an indirect test for the presence of loudness recruitment. A normal-sized difference limen was thought to imply the absence of recruitment, while an abnormally small difference limen was interpreted to indicate the presence of recruitment. Some investigators have failed to confirm these observations. Studies by Liden and Nilsson20 and Lund-Iversen References 1. Bangs, J. L., and Mullins, C. J.: Recruitment Testing in Hearing and Its Implications , A. M. A. Arch. Otolaryng. 58:582-592, 1953.Crossref 2. von Békésy, G.: A New Audiometer , Acta Oto-Laryng. 35:411-422, 1947.Crossref 3. Denes, P., and Naunton, R. F.: Methods of Audiometry in a Modern Deafness Clinic , J. Laryng. & Otol. 63:251-274, 1949. 4. Denes, P., and Naunton, R. F.: The Clinical Detection of Auditory Recruitment , J. Laryng. & Otol. 64:375-398, 1950. 5. Doerfler, L. G.: Differential Sensitivity to Intensity in the Perceptively Deafened Ear, unpublished Ph.D. Dissertation, Northwestern University, 1948. 6. Halm, T.: Determination of the Difference Limen and the Latest Illustration Thereof in Audiometry , J. Laryng. & Otol. 63:464-466, 1949. 7. Harris, J. D.: A Brief Critical Review of Loudness Recruitment , Psychol. Bull. 50:190-203, 1953. 8. Jerger, J. F.: A Difference Limen Recruitment Test and Its Diagnostic Significance , Laryngoscope 62:1316-1332, 1952. 9. Jerger, J. F.: DL Difference Test , A. M. A. Arch. Otolaryng. 57:490-500, 1953. 10. Lundborg, T.: Differentiation of Hearing Impairments of Neurogenic Origin , Nord. Med. 49:714-717, 1953. 11. Lüscher, E., and Zwislocki, J.: A Simple Method of Monaural Determination of the Recruitment Phenomenon , Pract. oto-rhino-laryng. 10:521-522, 1948. 12. Lüscher, E., and Ermanni, A.: The Topical Diagnostic Significance of the Difference Limen of Sound Intensity Changes (Results of an Examination of 71 Hard of Hearing Patients) , Arch. Ohren-, Nasen- u. Kehlkopfk. 157:158-216, 1950. 13. Lüscher, E.: Our Determination of the Difference Limen for Intensity Modulation of Pure Tones, Its Validity, and Its Topo-Diagnostic Efficiency , Acta oto-laryng. 45:402-415, 1955. 14. Lüscher, E., and Zwislocki, J.: Comparison of the Various Methods Employed in the Determination of the Recruitment Phenomenon , J. Laryng. & Otol. 65:187-195, 1951. 15. Lüscher, E.: The Difference Limen of Intensity Variations of Pure Tones and Its Diagnostic Significance , J. Laryng. & Otol. 65:486-510, 1951. 16. Miskolczy-Fodor, F., and Hajts, G.: Behavior of the Difference Limen in Otosclerosis , Magy. sebészet 3:84-90, 1950. 17. Neuberger, F.: Investigations on the Qualitative Parallelism Between Difference Limen and the Recruitment Phenomenon , Monatsschr. Ohrenh. 84:169-182, 1950. 18. Pirodda, E.: Intensity Discrimination Threshold in Bone Conduction , Oto-rino-laryng. ital. 19:152-158, 1950. 19. Rosenberg, P. E. The Influence of Stimulus Duration upon Differential Intensity Sensitivity in Normal and Impaired Ears, unpublished Ph.D. Dissertation, Northwestern University, 1956. 20. Liden, G., and Nilsson, G.: Differential Audiometry , Acta oto-laryng. 38:521-527, 1950. 21. Lund-Iversen, L.: An Investigation on the Difference Limen Determined by the Method of Lüscher-Zwislocki in Normal Hearing and in Various Forms of Deafness , Acta oto-laryng. 42:219, 1952. 22. Hirsh, I. J.; Palva, T., and Goodman, A.: Difference Limen and Recruitment , A. M. A. Arch. Otolaryng. 60:525-540, 1954. 23. Jerger, J. F.: Differential Intensity Sensitivity in the Ear with Loudness Recruitment , J. Speech & Hearing Disorders 20:183-191, 1955. 24. Stevens, S. S.; Morgan, C. T., and Volkmann, J.: Theory of the Neural Quantum in the Discrimination of Loudness and Pitch , Am. J. Psychol. 54:315-335, 1941. 25. Hallpike, C. S., and Hood, J. D.: Some Recent Work on Auditory Adaptation and Its Relationship to the Loudness Recruitment Phenomenon , J. Acoust. Soc. America 23:270-274, 1951. 26. Dix, M. R., and Hood, J. D.: Modern Developments in Pure Tone Audiometry and Their Application to the Clinical Diagnosis of End Organ Deafness , J. Laryng. & Otol. 67:343-357, 1953.
A.M.A. Archives of Otolaryngology – American Medical Association
Published: Feb 1, 1959