Correction to: Nature Communications, published online 8 October 2018.

The original version of this Article contained an error in the Acknowledgements, which incorrectly omitted from the end the following: ‘This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (MemoryDynamics - grant agreement No 694086).’ This has been corrected in both the PDF and HTML versions of the Article.