An attempt was made to develop a speechreading test by using a television for evaluating the speechreading ability in the hearing-impaired, and the combined effects of speechreading and listening with a hearing aid on comprehension of speech was evaluated. The test materials consisted of 25 words and 10 short sentences. The test was presented to 34 hearing-impaired adults and 23 graduate students without hearing impairments under three conditions: (1) speechreading without the use of a hearing aid (vision alone), (2) with the use of a hearing aid, but without watching the speaker's lips (hearing alone), and (3) speechreading and listening with a hearing aid (hearing combined with vision). In addition, the test of reading ability was given to the hearing-impaired clients. Most of the 34 hearing-impaired were graduates of schools for the deaf and had been trained in speechreading, while the 23 students had never received special training of speechreading. It was demonstrated that speechreading ability as well as reading ability was poorer in many cases of the hearing-impaired clients than in the graduate students. It was concluded that the poor speechreading ability found in the hearing-impaired may be related to poor ability of language comprehension.
The author studied case history and causes of deafness of 535 children with hearing loss under 15 years of age who consulted Visual and Auditory Research Institute of Fukuoka Medical Association during one year and six months from 1970 to 1972. The frequency of hereditary deafness was 13.7%, prenatal deafness 13.7%, paranatal deafness 29.9%, postnatal deafness 4.6% and unknown causes was 38.1%. The author compared these results with those in 459 hard of hearing children under 10 years of age who consulted otolaryngological clinic of Kyushu University during five years from 1957 to 1961. There was no great difference between the frequencies of hereditary deafness in both studies, but prenatal and paranatal deafness was much more and postnatal deafness was much less in the author's study than that in their study. The frequency of prenatal and paranatal disturbances in hard of hearing children was compared with those in normal children of three years of age. The frequencies of maternal rubella infection in pregnancy, threatend abortion, asphyxia, premature baby and sever jaundice in hard of hearing children were higher than that in the normal children.
After injection of a high dosis of SM-complex into perilymph, many severe, injuries that could not be found obviously by the systemic administration of SM were observed in tissues in the cochlear duct. The authors defined these injured areas and disclosed the restoration mechanisms about the barriers between perilymph and endolymph. The endolymphatic surface of scala media of those injured areas were covered with one layer of new epithelial cell which was ranged with the epithelial cell layer of Reissner's membrane.
Difference limen for the formant frequency (DLFF) was examined using synthesized vowels in 10 normal adults (5male and 5femal) and 90 children aged from 7 to 15 years old, which consisted of 10 in each age group. DLFF of normal adult was 4.9-9.6% in ΔF/F, relative DLFF: and no significant difference was shown between male and female. DLFF in children showed a learning developmental curve showing large ΔF/F in younger childeen, 25% in 7 years old, and 11-15 years old children showed the same value as that of adult, and no significant difference was also observed between boy and girle.
It has been established that the cervical nystagmus is an objective sign to prove the relation between equilibrium disturbance and neck lesion, but no objective sign is found fcr the relation between perceptive deafness and cervical lesion. In this paper the authors reported a phenomenon that the pure tone threshold was shifted more than 20dB when the patients changed their neck to the position provoked the cervical nystagmus. This phenomenon may be referred to as Cervical ThresholdShift. In 25 out of 60 patients with the cervical nystagmus CTS were found positive, and the phenomenon was divided into three types in regard to level of shift with interrupted (I) and continuous (C) test tones. Type I: More than 20dB for both I and C, and within 10dB for the I-C difference. Type II: More than 20dB for both I and C, and more than 20dB for the I-C difference. Type III: No change for I, more than 20dB for C. thus more than 20dB for the I-C difference. From the fact that the CTS phenomenon appeared particulary in the neck posture provoking the cervical nystagmus and never in other posture provoked no cervical nystagmus, the CTS may be useful for the diagnosis of the auditory disorder due to cervical lesions.
The cochlear microphonics were recorded from the basal turn by means of the differential electrode technique. After injection of 2mg/kg of furosemide CM increased for 5 minutes, rapidly decreased by 66.7% of the initial value within 35 minutes and then gradually decreased. One hour after the injection CM maintained the same value for over 3.1/2 hours. After injection of 10mg/kg of furosemide CM also caused an increase in amplitude and then a gradual decrease. It remained depressed for over 4 hours. The depression of CM would be due to the changes in the concentration of sodium and potassium in the endolymph which would be caused by the inhibition of active transport of sodium in the stria vascularis. After injection of 20mg/kg of furosemide, CM showed a primary depression followed by a recovery within 1 hour and then they showed the second depression. The primary depression of CM would be due to the inhibition of active transport of sodium in the stria vascularis and the second depression would depend upon the histological changes in the stria vascularis. But further investigation is necessary.
We firstly recorded a human fetal heart tone after tone stimulus was given to maternal abdominal surface of third trimester by using of fetal heart rate meter and ultrasonic Doppler method, and the heart tone signal was converted into a train pulse which comprised only the initial beats by using of band-pass filter and photocell-lamp. Further we observed the change of fetal heart rate and fetal movement used by digital computer to obtain sequencial controlled interval variation. The results were as follows: 1) It was approved that the fetal movement was recognized within 10 seconds after tone stimulus was given and heart rate was increased within 20 seconds. The heart rate recovered within approximately 40 seconds. 2) We considered it was a good method to use Doppler method to find the hard of hearing of fetus at first trimester.