JSAI Technical Report, Type 2 SIG
Online ISSN : 2436-5556
Analysis of the difference of bowing between expert Erhu player and novice player by using surface electromyogramng
Shaoru WANGTsutomu FUJINAMI
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RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS

2017 Volume 2017 Issue SKL-23 Pages 06-

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Abstract

The goal of this paper is to find the difference of Erhu's bowing between expert players and novice players. Erhu is a two-stringed instrument created in China. It is much different from other string instruments such as the violin because Erhu's stick is located between two strings. In this experiment, I ask the subjects to play four songs that are very simple so that even the novice players can learn them quickly. These songs include some of the most basic actions in Erhu's bowing, such as up-bowing, down-bowing and string change. Electromyogram is attached on eight parts (M.thenar,M.felexor carpi radialis, M.biceps brachii, M.triceps brachii, M.deltoideus, M,supraspinatus. ) of the subject's right arm. I found the difference between expert players and novice players after analyzing the average amplitude and using FFT analysis method. The muscle activity is usually more stable in experts than experienced players, and the experienced players present better stability than novice players. The M.thenar ,M.felexor carpi radialis and M.deltoideus have the clearest difference between expert players and novice players. Novice players always put unnecessary power in those muscles, so it can be said they are tense when bowing. But I could not find a clear influence of the M.felexor carpi radialis, M.biceps brachii, M.triceps brachii and M.deltoideus muscles in the bowing action and thus found no difference in between subjects. Then I found that both experienced and novice players usually put more power in M.thenar when they are up-bowing. And I also understood that expert players' muscles have activity pattern when they change the stick, they always use the M.thenar at the first, and then use the M.deltoideus and M.felexor carpi radialis sequentially but novice players do not do it. Even experts have their own customs to play Erhu, so it is difficult to decide the correct activity of muscles by only looking at 3 expert players in my experiment. It is necessary to increase the number of subjects and analyze their characteristics to know the correct activity of muscles.

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