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Stochastic and coherence resonances appear in nonlinear systems subjected toan external source of noise and are characterized by a maximum response at theoptimal value of the noise intensity. This paper shows experimentally that itis possible to observe them in a chaotic system. To this end we have analysedan electronic Chua circuit running in the chaotic regime and added noise to itsdynamics. In the case of coherence resonance, we observe an optimal periodicityfor the jumps between chaotic attractors, whereas in the case of stochasticresonance we observe a maximum in the signal-to-noise ratio at the frequency ofan external sinusoidal perturbation.Comment: 6 page

Experimental Observation of Coherence and Stochastic Resonances in an Electronic Chua Circuit