The effect of mental rotation on changes in plasma testosterone and cortisol levels.
All authors: Durdiakova J, Hodosy J, Kubranska A, Ostatnikova D, Celec P
Central European Journal of Biology, 7 (6): 1005-1012, 2012
http://link.springer.com/article/10.2478%2Fs11535-012-0084-6?LI=true#page-1