228 (WMS–IV) subtest Verbal Paired Associates 41. The test was performed twice, once before the administration of DCS and once at the end of the scanning session. MRI Data were collected at the Leiden Institute for Brain and Cognition imaging facilities at the Leiden University Medical Center, using a Phillips Achieva 3 Tesla scanner with a maximum gradient strength of 40 mT/m, bore diameter of 60cm, and field-of-view of 45cm (head-feet direction), and a 32-channel head coil. A structural MRI was made with a T1 weighted gradient echo sequence. Functional scans were taken utilizing T2* weighted gradient echo planar images (TR=2200ms, voxel size = 2.75 x 2.5 x 2.75mm, TE= 30ms, flip angle = 80°, matrix = 80 × 80, field of view = 220 × 220, slice thickness = 2.75mm, slice gap = 0.28mm, 40 slices per volume, sensitivity encoding factor = 2) with a 32-channel SENSE head coil. Functional scans began with two automatically discarded dummy volumes to allow for magnetic field stabilization. Heart rate (finger pulse oximeter) and respiration (respiratory belt transducer) were measured to correct for physiological artifacts during scanning. Questionnaires A questionnaire containing demographic and health questions was used to screen participants for inclusion. An MRI-compatibility questionnaire was also used, to ensure participants were eligible to enter the scanner. The Structured Clinical Interview for the Diagnostic and Statistical manual for Mental disorders (SCID-5-RV 42 was used to screen participants for psychiatric disorders. The following four questionnaires
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