Described herein are flavonoids (e.g., 5-desoxy flavones and/or 5-desoxy flavonols, including without limitation fisetin and its derivatives) that activate ERK and induce CREB phosphorylation in neuronal cultures, facilitate long-term potentiation in hippocampal slices and enhance object recognition in vivo. Methods of using these flavonoids, for instance, for enhancing memory are described.