There is also a crippling loss of nerve cells in brain areas involved in cognitive functions which leads to the main behavioural symptom, failure of the memory.

ECONOMIST: Disposing of dementia

Memory Failure: Memory research of the last three decades tells us that memory is far more fallible than we ever thought.

FORBES: Why Juries Will Be Replaced by Computers

Dr Morrison explained that it was assumed that a failure to retrieve a memory was the result of that memory not being recorded properly in the first place.

BBC: Beatles' tunes aid memory recall