Fruit fly study sheds light on how forgotten memories return and change
As they explore the world, humans and other animals create many memories that they will later recall and that might inform their future actions. Over time, however, some of these memories can be forgotten or become less nitid, until a related event or sensory cue brings them to the surface.
A recent study published in Nature Neuroscience has shed light on the neural processes behind the recovery of forgotten memories and the potential for false or distorted memories to emerge. Researchers at the Friedrich Miescher Institute for Biomedical Research and the University of Basel conducted their investigation using fruit flies (Drosophila) due to their well-characterized memory circuits.
The study found that forgotten memories often persist as silent neural traces and can be reactivated by reminders, even after seemingly being forgotten. This was demonstrated through a behavioral protocol known as the T-maze, in which fruit flies learned to associate an odor with mild electric shocks. After a brief period of training, the memory would fade and appear forgotten.
However, the researchers found that presenting the flies with the same odor in the same chambers where they experienced the shock could recover the forgotten memory, without the need for re-shocking. This discovery provides insight into how memories can change over time and be influenced by new experiences.
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