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Physarum polycephalum encodes the location of a past nutrient stimulus in its tube-diameter hierarchy: tubes toward the food dilate and the diameter pattern persists after the stimulus itself is gone.

✓ VERIFIED

Grade E2 · state: verified · id: IB-physarum-tube-memory

Quantities: imprint outlasts the consumed stimulus; carried by a softening agent (chemically unidentified; ATP candidate) advected on the Ca2+-driven shuttle-streaming flow

Primary source

Kramar & Alim 2021, PNAS

Edges (outgoing)

• relates → A single ~5-minute trapping event teaches wild American crows a specif — controller-less memory that outlasts the stimulus that created it (Physarum tubes ~ crow faces)
• relates → Physarum uses an EXTERNALIZED spatial memory — avoidance of its own ex — internal store (tube diameters) alongside an external store (slime trail) in the same organism

Incoming edges (what points here)

• A single ~5-minute trapping event teaches wild American crows a specif — relates → this (controller-less durable memory outlasting its stimulus by orders of magnitude)
• Physarum uses an EXTERNALIZED spatial memory — avoidance of its own ex — relates → this (external slime store operating alongside the internal tube-diameter store)