Out-of-equilibrium disordered systems may form memories of external driving in a remarkable fashion. The system ‘‘remembers’’ multiple values from a series of training inputs yet ‘‘forgets’’ nearly all of them at long times despite the inputs being continually repeated. Here, learning and forgetting are inseparable aspects of a single process. The memory loss may be prevented by the addition of noise. We identify a class of systems with this behavior, giving as an example a model of non-Brownian suspensions under cyclic shear.



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