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How the brain reads a stable meaning from a code that keeps changing is unknown.","posed_since":"2013","precise":"In mouse hippocampus and posterior parietal cortex, single-neuron tuning reorganizes over days to weeks at constant behavior (Ziv and co-workers, 2013; Driscoll and co-workers, 2017). Determine the mechanism that keeps the readout stable: drift confined to directions that the readout ignores, continual relearning by downstream circuits, or conserved population geometry; predict the drift rate and its geometry from measured synaptic turnover and plasticity statistics.","problem_ref":null,"references":"","settled_by":"Chronic recordings of a population and its downstream target, with measured synaptic turnover, showing which model predicts the drift statistics and the stability of decoded behavior.","status_note":"","title":"How stable memories survive drifting neural 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