Planarian flatworms regenerate their entire brain and retain memories after head amputation (Shomrat & Levin and related work).

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• Trained planarian flatworms regenerating new heads retain memory of learned behaviors, with behavioral engrams imprinted on newly formed brain tissue.finding0.927
  Evidence that memory and anatomical form are tightly linked; information processing enables integration of behavioral and morphological change.
• Planaria maintain memories and re-imprint them from tail fragments onto newly regenerating brains.finding0.876
  Example of memory dynamics during extreme regeneration.
• Planarians derived from tail fragments of trained worms retain original information after brain regenerationfinding0.865
  Behavioral memories in planaria persist through complete brain regeneration, indicating movement of memory across tissues.
• Planarian flatworms contain voltage patterns in non-neural cells that are re-writable latent pattern memories guiding future regenerative anatomy, editable without touching the genome.finding0.863
  Key empirical result demonstrating a sharp distinction between the cellular machine and the data it uses, analogous to false memory inception
• Planarian Brain Regeneration with Memory Retentionfinding0.845
  Empirical finding that planaria tail fragments retain learned information and imprint memories onto newly regenerated brains.
• Planarian fragments regenerating from bioelectrically re-patterned tissue produce permanent two-headed phenotype, demonstrating transient bioelectric states can produce lasting morphological memory changes.finding0.841
  Key evidence that morphogenetic memories are stored in bioelectric circuits and are rewritable via transient voltage state modifications; memory persists across multiple regeneration cycles.
• Planarian memory persistence across head regenerationfinding0.840
• Planaria retain conditioned responses after complete brain regenerationfinding0.838
  Worms trained before decapitation re-acquire the memory after regenerating a new brain, showing transfer of information across tissues.