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The biological rhythm is basically subject to 1/f fluctuations. The typical examples are heart rate and blood pressure. The present author has found that, in addition to the heart rate, spontaneous discharge interval of a giant neuron of African snail has 1/f fluctuations and hand clapping intervals also have 1/f fluctuations. Furthermore, the axon as a transmission line of biological signal has a strong nonlinearity, which modulates the time relation of launched action potential impulses; the time relation of randomly launched impulses is modulated by this nonlinearity and eventually it reached 1/f fluctuations. The biological body has a special affinity to 1/f fluctuations. Computer simulation shows that 1/f interval fluctuations are deeply related to 1/f fluctuations of membrane admittance to ion currents. The physical origin will be the same as conductance fluctuations of electric conductors which have been widely observed in any type of electric conductor. Finally, a possibility is discussed that 1/f fluctuations in biological rhythm and signal transmission have special meaning as regards stable parallel control.
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