1987 Fiscal Year Final Research Report Summary
The Study on Acoustical Condition and Hearing Mechanism for Illusional Melody Perception
| Project/Area Number |
61510049
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Psychology
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| Research Institution | Kyushu Institute of Design |
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Principal Investigator |
TERANISHI Ryunen Faculty of Design, Kyushu Institute of Design, Professor, 芸術工学部, 教授 (50038981)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAJIMA Yoshitaka Faculty of Design, Kyushu Institute of Design, Assistant, 芸術工学部, 助手 (90127267)
TSUMURA Takashi Faculty of Design, Kyushu Institute of Design, Assistant Professor, 芸術工学部, 助教授 (20038962)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Pitch / Pitch of Complaxtone / Shepard Tone / Endlessly Rising or Falling Complex Tone Sets / Movement of Pitch / Dynamic Perception of Pitch / Melody Perception |
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| Research Abstract |
Results of the study are described in the reference articles, and the abstract becomes as follows.
At first, we proposed and demonstrated a new type complex tones which can produce quite similar effect to that of the Shepard tones, viz. an endlessly rising or falling melody, but they don't spread so wide in frequency range as Shepard tones occupy 10 octaves. They are chordal tones of major triad, having the second and the fourth harmonics within the trapezoidal spectral envelope, so they occupy only 3 octaves. 10 such tones consisting a set like the Shepard tone set were obtained by 10 times shifting of all components by 120 cents in each time.
In order to check how their pitch are perceived dynamically in each other whenever they are given successively, we carried out paired comparison tests. We found out that the distribution map of the tones in the psychological space derived from the MDS analysis becomes a complets single circle or triplecircle, depending on the individual subjects.
Then, we performed experimental study using several sets of non-octave structured and more simplified complex tones of which distributional maps becomes from double to single circle through the middle status of them, systematically.
According to the results, it becomes clear that the individuals notice to the periodic stripe pattern in the logarithmic frequency spectrum, and his hearing system tends to chase the pattern automatically. If some different patterns are given successively, the system maybe accept the spectra as if it has shifted from one to another, like a storoboscopic movement in visual perception. He perceives the rising pitch movement whenever the accepted shift direction is upward, and perceives falling melody whenever the direction is downward.
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[Publications] Minami,H., Nakajima,Y., Tsumura,T., Kunisaki,H., Ohnishi,S., and Teranishi,R.: "Circularity in relative pitch judgments of complex tones in view of periodicity of spectral pattern." 5. (1988)
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