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Forgetting refers to the loss of, or inability to access, information stored in memory. This may occur through a passive process by which the original memory trace is degraded, or by an active process by which new memories interfere with the retrieval of old ones.
New neurons are continuously produced throughout adulthood in the hippocampus. Here the authors provide evidence that adult hippocampal neurogenesis weakens existing memories, and facilitates the encoding of new, confliction information in mice.
A novel functional MRI technique that tracks the pattern of cortical activation associated with specific memories reveals that 'competitor' memories in the ventral visual cortex are actively suppressed by remembering.