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Figure 1: (a) Power spectral density of variations in the heart rate in an adult conscious dog. (b) The power spectral density after giving parasympathetic blocking agent and total autonomic blocking agent in the same subject (courtesy, Akselrod et al.)

Figure 1: (a) Power spectral density of variations in the heart rate in an adult conscious dog. (b) The power spectral density after giving parasympathetic blocking agent and total autonomic blocking agent in the same subject (courtesy, Akselrod et al.)