This study was designed to clarify the psychological backgrounds influenced to listner's judgement hearing a speech sound, with respect to familiarity of Japanese monosyllables.
The familiarity is defined as the frequency of usage in conversation and letters, say, as a degree in whether a monosyllable is more or less frequently used.
Familiarity of Japanese monosyllables can be classified to four kinds of group due to the frequency of usage of Japanese monosyllables.
Discrimination scores of four groups were compared with each other. Next, the problem, say, whether Japanese monosyllables are meaningfull or meaningless, was studied and time needed for its judgment was measured.
The results mentioned above were as follows. 1) A monosyllable was the more familiar the more discriminable. 2) Under various condition of acoustic distortion due to low-pass or high-pass filtering, it will be clear that high familiar monosyllables will be more remarkablly discriminated.
3) Most of all Japanese monsyllables are considered to be meaningfull.
4) Mechanism of familiarity of Japanese monosyllables acted on auditory discimination was discussed from the view of information theory. It is theoretically seemed that familiarity will act on mechanism of auditory information production in cortex.
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