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Forgetting Is A Form Of Learning, Irish Scientists Suggest

We create countless memories as we live our lives but many of these we forget. Why? Counter to the general assumption that memories simply decay with time, “forgetting” might not be a bad thing -- that is according to scientists who believe it may represent a form of learning, ScienceDaily reported.


Photo Insert: The new theory proposes that forgetting is due to circuit remodeling that switches engram cells from an accessible to an inaccessible state and proposes that forgetting is actually a form of learning that alters memory accessibility in line with the environment and how predictable it is.



The scientists behind the new theory -- outlined today in the journal Nature Reviews Neuroscience -- suggest that changes in our ability to access specific memories are based on environmental feedback and predictability.


Rather than being a bug, forgetting may be a functional feature of the brain, allowing it to interact dynamically with the environment.



The new theory has been proposed by Dr. Tomás Ryan, Associate Professor in the School of Biochemistry and Immunology and the Trinity College Institute of Neuroscience at Trinity College Dublin, and Dr. Paul Frankland, professor in the Department of Psychology at the University of Toronto and the Hospital for Sick Children in Toronto.


Both Dr. Ryan and Dr. Frankland are fellows of the Canadian global research organization CIFAR, which enabled this collaboration through its Child & Brain Development program, which is pursuing interdisciplinary work in this area.


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Dr. Ryan, whose research team is based in the Trinity Biomedical Sciences Institute (TBSI), said: "Memories are stored in ensembles of neurons called 'engram cells' and successful recall of these memories involves the reactivation of these ensembles. The logical extension of this is that forgetting occurs when engram cells cannot be reactivated… Our new theory proposes that forgetting is due to circuit remodeling that switches engram cells from an accessible to an inaccessible state. Because the rate of forgetting is impacted by environmental conditions, we propose that forgetting is actually a form of learning that alters memory accessibility in line with the environment and how predictable it is."


Dr. Frankland added: "There are multiple ways in which our brains forget, but all of them act to make the engram -- the physical embodiment of a memory -- harder to access."



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