James Franck Institute, Department of Physics, University of Chicago, Illinois 60637, USA.
Phys Rev Lett. 2011 Jul 1;107(1):010603. doi: 10.1103/PhysRevLett.107.010603. Epub 2011 Jun 30.
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.
非平衡无序系统可能会以显著的方式形成对外界驱动的记忆。该系统“记住”了一系列训练输入的多个值，但尽管输入不断重复，在长时间后几乎“忘记”了它们中的所有值。在这里，学习和遗忘是单一过程的不可分割的方面。通过添加噪声可以防止记忆丢失。我们确定了具有这种行为的一类系统，给出了一个在循环剪切下的非布朗悬浮液模型的例子。
