Correction to: Nature Neuroscience https://doi.org/10.1038/s41593-018-0145-x, published online 7 May 2018.

In the version of this article initially published, the annotation accompanying ref. 47 ended with “though the modulation of microglia.” The first word of this phrase should have been “through.” The error has been corrected in the HTML and PDF versions of the article.