Representational Drift
Neural activity patterns can change over time while behavior remains relatively stable.
The Mechanism: Representational drift describes changes in neural activity patterns over time during repeated tasks or sensory experiences. The phenomenon has been observed in some brain systems, while behavior can remain stable through compensation or population-level dynamics.
The Philosophical Pivot: The brain may maintain a capacity without preserving the exact same internal pattern. Identity and continuity can persist through change rather than depend on an unaltered code.
The Horizon: The finding challenges simple assumptions about memory storage and neural representations, while leaving open how different circuits maintain function. Researchers continue to investigate the mechanisms.
Drift does not mean memories vanish or that the brain has no stable organization. It shows that stability can arise from patterns of change, not only from fixed components.
A system can remain itself by changing how it carries what matters.
Continuity does not always require the same parts to remain unchanged.
What remains stable in me through change, and what might only appear stable because I do not see its revisions?