| Cluster of Mysterious Amnesia Cases Has Researchers Puzzled
More than a dozen people in Massachusetts suddenly developed severe amnesia, but there was no clear cause of their memory loss, leaving researchers puzzled about what exactly could have been behind these cases, according to a new report. In the report, researchers describe a cluster of 14 cases involving people who experienced sudden amnesia, and who were treated in Massachusetts from 2012 to 2016. All of the patients were relatively young (19 to 52 years old), and all had either tested positive for drugs or had a history of substance abuse, according to the report. The patients showed "striking anterograde amnesia," according to the report, from researchers at the Lahey Hospital & Medical Center in Burlington, Massachusetts, and the Massachusetts Department of Public Health (MDPH). People with this type of amnesia have trouble forming new memories, and they often cannot recall events from the immediate past, such as something that has just happened to them. In nine of the cases, the