The way in which memories are formed may have been uncovered by UK scientists, offering hope to people with Alzheimer's disease.
Researchers at the University of Leicester believe they have identified the mechanism by which humans form memories.
A protein involved in learning and memory processes have been found by the scientists, who believe proper understanding of Alzheimer's is now one step closer.
The Alzheimer's Research Trust welcomed the new study, but said more needs to be done to improve research into the condition.
Alison Cranage, science communications officer at the organisation, said: "By understanding how the brain works and [how] our memories are made we can hope to understand how these processes might go wrong in Alzheimer's disease."
She added: "We need much more research into Alzheimer's; its causes, ways to diagnose and treat it so we can defeat this dreadful disease."
Earlier this year, scientists from the University of Edinburgh suggested that a healthy diet and lifestyle in middle age can reduce the risk of developing dementia in later life.