Wilhelm Wundt: "Gerakan kontraktil muncul, kadang-kadang atas dorongan...
"Gerakan kontraktil muncul, kadang-kadang atas dorongan rangsangan eksternal tetapi kadang-kadang juga dengan tidak adanya pengaruh eksternal yang jelas."
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Versi Bahasa Inggris
Contractile movements arise, sometimes at the instigation of external stimuli but sometimes also in the absence of any apparent external influence.
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