Using the MRS machine, researchers repeated the earlier experiments but with two changes. First, the two groups trained on either the usual (eight-block) condition, or the overlearning (sixteen-block) condition, but without a second training. And, before the first test and training researchers scanned the subjects’ brains in the MRS machine. Researchers also scanned the subjects’ brains 30 minutes after the training, and again 3.5 hours after the training. The post-test was again held on the second day.