Cavanagh et al test the sustained vs dynamic activity models of working memory. They find that sustained activity does not maintain the memory of a cue location/response past a distractor. Instead of sustained activity, they conclude that a dynamic population-level process underlies working memory.
Cavanagh, S. E., Towers, J. P., Wallis, J. D., Hunt, L. T., & Kennerley, S. W. (2017). Reconciling persistent and dynamic hypotheses of working memory coding in prefrontal cortex. bioRxiv, 231506.
