I believe this is the cited paper: http://www.jneurosci.org/content/30/43/14543.full.pdf http://www.jneurosci.org/content/30/43/14543.full.pdf They describe th

I believe this is the cited paper: http://www.jneurosci.org/content/30/43/14543.full.pdf http://www.jneurosci.org/content/30/43/14543.full.pdf They describe the "novel environment" starting on page 3.