Correction to: Nature Neuroscience https://doi.org/10.1038/s41593-018-0315-x, published online 21 January 2019.
In the version of this article initially published, graphs in Fig. 4 were labeled incorrectly. The figure has been replaced in the HTML and PDF versions of the article. In the PDF version of this correction, original and corrected figures may appear on the next page.