The Japan Journal of Logopedics and Phoniatrics
Online ISSN : 1884-3646
Print ISSN : 0030-2813
ISSN-L : 0030-2813
Volume 28, Issue 3
Displaying 1-7 of 7 articles from this issue
  • Eiji Yumoto, Kazunori Okamoto, Yumi Sasaki, Hiroshi Okamura
    1987 Volume 28 Issue 3 Pages 145-151
    Published: July 25, 1987
    Released on J-STAGE: June 22, 2010
    JOURNAL FREE ACCESS
    Using computer simulation, the authors examined the theoretically expected discrepancy between obtained H/N ratios and real H/N values, the effects of perturbations of pitch and amplitude on H/N ratio, and other factors.
    (1) Taking the averaged wave as an estimate of the harmonic component resulted in harmonic energy greater than its real valus. (2) The H/N ratio method detected perturbations of pitch and amplitude as a quantity of noise energy. The effect of pitch perturbation on the H/N ratio was much greater than that of amplitude perturbation. (3) The error range of the measurement system did not contribute significantly to the calculated H/N ratio.
    Based on the above findings, we may predict that the H/N ratio of an imaginative normal voice with a real H/N ratio of 10 dB (F0 160 Hz, pitch perturbation 0.5 %, amplitude perturbation 0.1 dB), for example, is measured as 10.9 dB.
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  • Noriko Oishi, Yaeko Miyairi, Masamichi Nagahata
    1987 Volume 28 Issue 3 Pages 152-161
    Published: July 25, 1987
    Released on J-STAGE: June 22, 2010
    JOURNAL FREE ACCESS
    1) A female subject complaining of delayed speech was observed in respect to the development of oral and written language over a period of four years, starting at age 5 years 10 months.
    2) In contrast to relatively satisfactory development of speech comprehension, development of speech output was remarkably delayed. The subject showed various specific developmental patterns of articulation including derivational errors towards a correct articulation and phonemic substitutions, which suggested fundamental disorder of motor programming for articulation.
    3) The development of written language was severely delayed in all aspects-oral reading, reading comprehension and writing-even after oral language was quite advanced. Analysis of the subject's difficulties in reading and writing using information processing models of reading and writing suggested developmental disorders of phonemic analysis and synthesis which were presumed to have been caused by the difficulties in motor programming for articulation.
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  • —Spectrographic Studies on the Pleasure Sign of Two-Month-Old Infants—
    Yoko Shimura
    1987 Volume 28 Issue 3 Pages 162-169
    Published: July 25, 1987
    Released on J-STAGE: June 22, 2010
    JOURNAL FREE ACCESS
    The relationship between the vocalizations of early infants and their mothers was investigated based on acoustic analysis. The subjects were eight infants of 40-70 days old and their mothers. The infants were sufficiently developed to utter pleasure vocalization. Acoustic characteristics of the voices of both infants and mothers uttering in a state of sustained mother-infant interaction were analyzed, and the correlation between motherese and infant vocalization was examined in terms of pitch, duration, latency and melody types.
    The results are the following.
    1) Correlation was significant between the average fundamental frequencies of the infants' voices and those of their mothers. Motherese and infant vocalization tended to parallel with each other in terms of pitch.
    2) There was little individual difference in the duration of infant vocalization, but a considerable individual difference in the duration of motherese. No correlation was observed in the duration of voices uttered by the infants and their mothers.
    3) The latencies of infant vocalization and motherese showed large differences among the infant-mother pairs. There was a tendency for the latency of the motherese to affect the number of utterances by the infant.
    4) Significant correlations among the melody types were observed in three motherinfant pairs.
    These findings indicate that there are significant correlations in the exchange of voices between infants and their mothers, and that motherese affects the vocalization of infants remarkably.
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  • Yukiko Nozawa, Yoshisato Tanaka
    1987 Volume 28 Issue 3 Pages 170-182
    Published: July 25, 1987
    Released on J-STAGE: June 22, 2010
    JOURNAL FREE ACCESS
    The present paper reports on a four-year follow-up study on a male infant with bilateral temporal lobe lesions.
    The patient had no abnormal developmental history before the onset of this disease. When he was six months old, he suffered from herpes simplex encephalitis, at which time he behaved as deaf. His development of auditory functions was compared with that observed in a hearing brain-damaged infant who was initially diagnosed as having deafness.
    From the observation of this infant until the present, the following results were obtained:
    1) Although the auditory thresholds for pure tones were gradually lowered, a developmental test of auditory functions demonstrated that there was no progress beyond the level of a normal eight-month-old infant.
    Therefore the discrepancy of development between auditory functions and visual functions as well as mental development was gradually diminishing.
    2) The development of higher auditory functions was completely inhibited, while lower auditory function integrated at the subcortical level was in development.
    3) Because language acquisition through the auditory channel seemed to be difficult, we attempted to educate the patient through the visual channel, but with little success.
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  • [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    1987 Volume 28 Issue 3 Pages 183-198
    Published: July 25, 1987
    Released on J-STAGE: June 22, 2010
    JOURNAL FREE ACCESS
    Download PDF (1907K)
  • [in Japanese]
    1987 Volume 28 Issue 3 Pages 200-201
    Published: July 25, 1987
    Released on J-STAGE: June 22, 2010
    JOURNAL FREE ACCESS
    Download PDF (355K)
  • [in Japanese]
    1987 Volume 28 Issue 3 Pages 202-206
    Published: July 25, 1987
    Released on J-STAGE: June 22, 2010
    JOURNAL FREE ACCESS
    Download PDF (438K)
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