A program announcement http://grants.nih.gov/grants/guide/pa-files/PAR-14-281.html was released by NIH in early August for applications that would explore connectivity in the human brain related to disease. NIA is participating and one of the conditions that is targeted is delirium (see p. 5 of the PA).
As is usual with PAs, there are several opportunities to submit applications but they differ from the standard submission dates (November 14, 2014, July 14, 2015 and July 14, 2016; see p. 2 of the PA).
For further information, please contact Dr. Brad Wise at NIA (contact information listed near the end of the PA) or Dr. Molly Wagster (firstname.lastname@example.org). Please note in the subject line that you are inquiring about PAR-14-281.