As reported in the NAELA eBulletin, medical researchers have successfully activated feelings from lost memories among mice genetically engineered to have early-onset Alzheimer’s disease by using a light stimulation therapy called optogenetics. Although the therapy can only be used in mice, scientists at the Massachusetts Institute of Technology (MIT) said the therapy could offer promise for people suffering from early-onset Alzheimer’s. The researchers’ lab previously identified cells in the brain’s hippocampus that hold certain memories. The memory traces, called engrams, can be exploited to activate existing memories or alter a memory’s emotional associations. In their paper, published Wednesday in the journal Nature, scientists noted that mice with retrograde amnesia had impaired memory but could still form new memories, so they wondered if the same was true among mice with Alzheimer’s, which causes similar problems with memory. Source/more: Fox News Health . Access the Nature article.