Stochastic Resonance(SR) is a phenomena that a excitable system is capable of detecting weak signal best with some optimal noise strength. In usually case, the optimal noise strength is only one value (one maximum in the S/N versus noise strength plot). Since our environment is always changing, a crucial problem is that is the noise strength always in this optimal level ? Namely, for different environment, thus different noise strength, does our system automatically tune the excitability such that it is optimal ?

Following Tina's presentation last time, this article was published by the same group this year and they moved on to investigate spatiotemporal memory properties in the cultured neural network. I think some ideas and results in the article may be informative for the work on retina and the future works in cultured neurons in our group.