Cascades and Cognitive State: Focused Attention Incurs Subcritical Dynamics - Fagerholm,ED; Lorenz,R; Scott,G; Dinov,M; Hellyer,PJ; Mirzaei,N; Leeson,C; Carmichael,DW; Sharp,DJ; Shew,WL; Leech,R (Journal of Neuroscience, 2015)