Article History
Received: 24 March 2016
Accepted: 26 May 2016
First Online: 4 July 2016
Change Date: 12 July 2016
Change Type: Erratum
Change Details: In the version of this article initially published online, the abstract referred to connected pairs of L4 and L2 and 3 (L2/3) neurons. It should have read L4 and L2/3 neurons. The error has been corrected for the print, PDF and HTML versions of this article.
Competing interests
: The authors declare no competing financial interests.