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Volume 21, Issue 3
Displaying 1-6 of 6 articles from this issue
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Shin'ichiro IWAMIYA1985 Volume 21 Issue 3 Pages 109-116
Published: June 15, 1985
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESS“FM-AM tones” are defined as fluctuation tones whose frequency and amplitude are periodically modulated by an identical modulation waveform simultaneously. “Principal pitch” is defined as somewhat steady and average pitch perceived from FM sounds with pitch fluctuation. In the present study the principal pitch shift of FM-AM tones was measured as a function of the modulation rate by the psychoacoustical experiment using a method of adjustment. The principal pitch shift interval from in-phase condition to anti-phase condition is nearly constant at the modulation rate of 4 to 7Hz, and becomes larger as the modulation rate becomes faster at the modulation rate of 7 to 20Hz. As the experimental results are considered to reflect the temporal resolving power of the auditory system for frequency modulation, the following hypothesis is proposed: The auditory system is able to follow the periodic frequency modulation when the modulation rate is slower than 7Hz. However, it becomes hard to follow the faster frequency modulation for the auditory system. Furthermore when the modulation rate becomes too fast to follow the modulation process, the perceived extent of FM becomes smaller, and is shifted toward the frequency region accompanied with larger amplitude.View full abstractDownload PDF (935K) -
Yoshiyuki YOSHIDA, Nobuo MACHIDA, Ryota MIKI1985 Volume 21 Issue 3 Pages 117-124
Published: June 15, 1985
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSThe physiological and psychological responses of vertical vibrations, from 0.2 to 2Hz, on human bodies were investigated. For physiological responses, the heart rate, the respiratory rate, the quantity of saliva secretion and the balance test were used as indices. For psychological responses, relationships between vibrational magnitude and feeling were determined by the semantic differential (SD) method.
The results obtained were; (1) exposures to low frequency vibrations decreased the heart rate, the respiratory rate and the quantity of saliva secretion, (2) the balance test indicated significant time decreases in standing upright on one leg with eyes closed with vibrations of 0.8Hz and lower, (3) factor analysis on data obtained by the SD method extracted factor of dynamism, and this factor strongly correlated with corresponding vibration acceleration levels, and (4) correlations were found between physiological and psychological responses. From these findings, the effects of low frequency vibrations on the body should be evaluated more objectively by adding psychological measurements to physiological ones.View full abstractDownload PDF (2262K) -
On an expression of individual differenceOsamu SUENAGA, Motozo IHARA1985 Volume 21 Issue 3 Pages 125-133
Published: June 15, 1985
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSA basic analysis was carried out to discuss the human small operation which consists of a non-operating and an operating part in a manual tracking performance, as an index of analyzing the individual difference on the one's recognition, decision, and operation process. The results obtained are as follows; (1) The small operation is relevant to the controlled argorithm which is concerned with the one's each process. (2) The parameters defined the small operation show statiscally the individual difference. (3) The ways of adding the weight for the factors which decide the controlled variable in a small operation vary with the subjects and the trials. Furthermore, it is concerned with the form of the learning curve. (4) The individual difference on the non-operating time, the operating time depend, respectively, on the one's inherent factor, on the change in the observation, recognition process or the ways of adding the weight for the input information.View full abstractDownload PDF (966K) -
Naoyuki OSAKA1985 Volume 21 Issue 3 Pages 135-137
Published: June 15, 1985
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSDownload PDF (302K) -
Kazuo AOKI1985 Volume 21 Issue 3 Pages 139-141
Published: June 15, 1985
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSDownload PDF (266K) -
Masao ITO1985 Volume 21 Issue 3 Pages 143-144
Published: June 15, 1985
Released on J-STAGE: March 11, 2010
JOURNAL FREE ACCESSDownload PDF (219K)
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