Researchers find "lost" memories
From: R&D - 05/29/2015

Memories that have been "lost" as a result of amnesia can be recalled by
activating brain cells with light.

Neuroscience researchers have for many years debated whether retrograde
amnesia—which follows traumatic injury, stress, or diseases such as
Alzheimer's is caused by damage to specific brain cells, meaning a memory
cannot be stored, or if access to that memory is somehow blocked, preventing
its recall.

In a paper published in Science, researchers at Massachusetts Institute of
Technology (MIT) reveal that they were able to reactivate memories that could
not otherwise be retrieved, using a technology known as optogenetics.

Read the entire article at:
http://www.rdmag.com/news/2015/05/researchers-find-lost-memories
http://newsoffice.mit.edu/2015/optogenetics-find-lost-memories-0528

Links:
Susumu Tonegawa
https://biology.mit.edu/people/susumu_tonegawa

Researchers show that memories reside in specific brain cells
http://newsoffice.mit.edu/2012/conjuring-memories-artificially-0322

The RIKEN-MIT Center
https://picower.mit.edu/About/riken-mit-center