I am writing to announce the open release of the test-retest resting state fMRI dataset recently published by Shehzad, Kelly et al. (2009) in Cerebral Cortex ("The Resting Brain: Unconstrained yet Reliable"; doi:10.1093/cercor/bhn256). Contained within this are datasets for 25 participants, each including two MPRAGE images (1 skull-stripped, 1 face- anonymized), and three resting state fMRI scans. For the resting state scans, two of the scans were collected < 1hr apart in the same scan session, and the third scan was collected >5 months earlier. These data are being shared without restriction on www.nitrc.org, with the following project name: NYU_CSC_TestRetest (or just go to: http://www.nitrc.org/projects/nyu_trt/ ). This dataset is being shared as a courtesy of the Phyllis Green and Randolph Cowen Institute for Pediatric Neuroscience at the NYU Child Study Center. Best, Mike Michael P. Milham, MD, PhD Associate Director Phyllis Green and Randolph Côwen Institute of Pediatric Neuroscience NYU Child Study Center Leon Levy Assistant Professor Department of Child and Adolescent Psychiatry NYU Langone Medical Center