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The main objective of this work is to explore aspects of stochastic resonance(SR) in noisy bistable, symmetric systems driven by subthreshold periodicrectangular external signals possessing a large duty cycle of unity. Using aprecise numerical solution of the Langevin equation, we carry out a detailedanalysis of the behavior of the first two cumulant averages, the correlationfunction and its coherent and incoherent parts. We also depict thenon-monotonic behavior versus the noise strength of several SR quantifiers suchas the average output amplitude, i.e. the spectral amplification (SPA), thesignal-to-noise ratio (SNR) and the SR-gain. In particular, we find that withsubthreshold amplitudes and for an appropriate duration of the pulses of thedriving force the phenomenon of stochastic resonance (SR), is accompanied bySR-gains exceeding unity. This analysis thus sheds new light onto the interplaybetween nonlinearity and the nonlinear response which in turn yieldsnontrivial, unexpected SR-gains above unity.Comment: 17 pages, 7 figure

Subthreshold stochastic resonance: Rectangular signals can cause anomalous large gains