. "Phywrul Dam ami Physiulii..!)-»f K\iil..liiu, "f ,h.. A ». ühliiol.. «ml Lnrynuul.. Itt;«. 41. 7111-7711. IIMKIII of (be Auditory Nerve." Ann. Otol..-■IIH-"normal hmrinit" mom. will » u h. stilly b.-i.-t.-ri-.tl to »s "normal»." •I perimental session the thresholds on each ear for discomfort, tickle, and pain were determined for given frequencies and then repeated. In other words the thresholds were determined for the right ear then the left ear, followed by a repeat series of measurements on the right ear and the left ear. Kxcept in a few instances there were six consecutive sessions one week apart for each subject. In most cases thresholds of acuity were determined before and after testing for tolerance thresholds. This latter procedure was introduced in the course of the experiment to determine what effect exposure to high intensity stimuli might have on the threshold of acuity. 2. Speech tolerance-There were 30 normal ears and 30 hard-of-hearing ears exposed to the complete experimental procedure. These subjects were subdivided into three groups (1, 2, and 3) of 10 normal and 10 hardof-hearing ears each. The basis of division between groups 1 and 2 was the order of testing of ears with the time interval between sessions remaining constant. Groups 1 and 3 differed in the time interval between session* with the order of testing of ears remaining constant. An experimental session consisted of determination of thresholds of acuity for speech, and discomfort, tickle, and pain thresholds four times for each ear. All subjects were exposed to four sessions of speech tolerance testing as contrasted witli six sessions for pure tone tolerance. The fact that the speech tolerance threshold curves were reaching asymptotes as a function of experience determined the number of sessions. Study of change of tolerance a) Change with experience: The change of tolerance (which subsequently proved to be upward) for pure tones and speech as a function of number of consecutive testing sessions was studied. b) Retention of tolerance: The retention of tolerance for speech as a function of given time intervals from date of last test was investigated. c) Contralateral tolerance: The effect of tolerance tests for speech and pure tones of one ear on the opposite ear was studied. This phenomenon is defined as contralateral tolerance. d) Transfer tolerance: The effect on tolerance for pure tones as a result of exposure to speech tolerance procedure was investigated. This phenomenon is defined as transfer tolerance. el Methods of elevating tolerance: When it was noted that the testing procedure, per se, elevated tolerance, it was decided to make a deliberate experimental attempt to increase tolerance in hard-of-hearing ears through exposure of the subject to two different levels of high intensity speech. Therefore, a third group of 10 hard-of-hcaring subjects was exposed at four weekly experimental sessions. The right ears of this group were exposed to one level of stimulation and the left ears to another level.
INVESTIGATORS in problems of the deaf and the hard of hearing have collected their research, organized their results, and published books that are valuable to the students preparing to teach, to test, and to continue research.Two of these were published at the same time and under the same title, but here the similarity ceased. Levine (1960) wrote her text from the rehabilitation point of view, stressed the psychosocial problems of deafness, and thus provided a guide for counselors and students interested in clinical testing. Myklebust (1960) stressed the limitations produced by sensory deprivation on the balance and equilibrium of all psychological processes. He included the results of his experimental work and many of the previously unpublished studies of his graduate students. Davis and Silverman (1960) revised Hearing and Deafness into a textbook for beginning students of audiology. They kept the original chapters intact, with additions to bring them up to date, and replaced the chapter on military aural rehabilitation with a new chapter on vocational guidance. Canfield (1959) wrote his handbook for the use of the person with a hearing impairment and his family.Wever translated and arranged the experiments of Von Bekesy (1960) into a volume that presents problems of auditory research, critical experiments in the field of hearing, and a discussion of cochlear mechanics.
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