Hikoichi Ishigami

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This study examined the characteristics of masticatory motion path using multivariate analysis. Principal component analysis was selected as the method and various important results were revealed as follows; Approximately 70% of the information describing gum chewing motion was explained by three principal components. From factor loading, the first(More)
In this experiment, the critical band (CB)-widths were measured using two narrow-band noises (NBNs) with steep cut-off slopes as a masker, varying their spectral level and center-frequency. The following results were obtained: (i) The CB-widths at all center-frequencies were narrower than the classical CB-widths estimated by Zwicker et al [J Acoust Soc Am(More)
A typical case of glomus jugulare tumor was presented. This 42-year-old man suffering from a left-sided impaired hearing progressive over a five year period was found to have a small hemorrhagic polypoid tumor in the left external auditory canal. After repeated surgical treatments the tumor removed was light and electron microscopically diagnosed as glomus(More)
Frequency modulation (FM) sounds were used as simultaneous maskers to estimate the psychophysical tuning curve (PTC). Maskers (800 ms duration) were FM sounds sweeping upward (1.2-->2.8 kHz) in Experiment I and downward (2.8-->1.2 kHz) in Experiment II. The signal was a pure tone of 2 kHz and the signal levels were 15-, 20-, 30-, and 35-dB SL. Masked PTCs(More)
In Experiment I, band noises were used as signals and pure tones were used as maskers. The conventional psychophysical tuning curves (PTCs) present the following characteristics depending on the signal level; slopes of the PTC are steeper than those of the auditory nerve fibers frequency threshold curve (FTC). This result from the large effect of the(More)