1989 Fiscal Year Final Research Report Summary
A sound synthesis system to help cognition experiments of higher animals Prof.
| Project/Area Number |
63890001
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
広領域
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| Research Institution | Hokkaido University |
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Principal Investigator |
KAMEDA Kazuo Hokkaido Univ. Sch. of Dent., Prof., 歯学部, 教授 (70018414)
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| Co-Investigator(Kenkyū-buntansha) |
IFUKUBE Tohru Hokkaido Univ., Res. Inst. Appl. Electricity, Prof., 応用電気研究所, 教授 (70002102)
OKUMURA Hiroshi Japan Women's Univ., Dept. of Biol., Prof., 家政学部, 教授 (50001764)
KOJIMA Shozou Kyoto Univ., Primate Res. Inst., Prof., 霊長類研究所, 教授 (70027499)
YOSHIDA Atsuya Osaka Univ., Facult. of Human Sci., Assist. Prof., 人間科学部, 助手 (50191573)
KAMADA Tsutomu Hokkaido Univ. Sch. of Dent., Assist. Prof., 歯学部, 助手 (20091431)
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| Project Period (FY) |
1988 – 1989
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| Keywords | Microcomputer / Sound analysis / Sound synthesis / Japanese money / Leach's storm-petrel / Auditory cortex / Behavioral experiment |
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| Research Abstract |
This project aimed to build a microcomputer aided sound synthesis system and to apply it to auditory physiology and behavioral experiments. Recent progress of microcomputers enabled us to treat the sound signals up to 50 kHz. Since the researchers under this project were concerned with auditory neurophysiology of monkey or vocal behavior of birds, appropriate stimulus sounds were necessary for experiments to get the exact response from neurons or animals.
In 1988, the microcomputer was combined with A/D, D/A converters. The softwares were bought or made to record the sound, to get FFT spectrum, to filter the sounds, to extract the components, to cut out the part of the sounds and to reproduce the stimulus sounds.
In 1989, the system was applied to synthesize stimulus sounds for auditory physiology and behavioral experiments. About 20 calls of Japanese monkey were analyzed and modified. Out of them, "coo" sounds were divided to the formant component and made a monkey hear the sounds as stimuli. The rate of frequency drift, upward or downward, of "'smooth early high" and "smooth late high" was artificially changed. These stimuli were used to get the responses from the neurons of auditory cortex.
There is a sexual dimorphism in the calls of Leach's Storm-petrel. The difference is mainly due to the frequency of the note of the calls. The system could produce mimic calls with frequency components in-between original male and female calls. The calls of this bird have characteristic rhythms. The rhythm was also artificially modified by the computer. These sample sounds were prepared for behavioral experiment. The other experiments were designed to test how the bird can differentiate the calls of the bird belonging to different species of the same genus.
The results showed that the microcomputer aided system offers very effective tools for these experiments.
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Research Products
(14 results)
