Exploration vs Growth: Designing a Valid Scientific Protocol for Your Blob

In the CNRS “Derrière le blob, la recherche” project, 15,000 volunteers weren’t just “watching” a blob grow; they were executing a precise dual-track scientific protocol. This design was created to differentiate between how heat affects a blob’s physical mass (growth) versus its cognitive decision-making (exploration).

If you want to move beyond being a “blob-sitter” and start being a researcher, you must follow the three phases of the official CNRS protocol.

Phase 1: The First Split (Creating the Control)

Every valid experiment requires a “Control Group”—a baseline that remains unaffected by the experimental variable.

1. The Cut: Once your initial blob is active and healthy, you must cut it into two equal parts using a sterile tool (spatula or toothpick).
2. The Environment:
   • Control Group: This half is kept at a constant room temperature (ideally 20-25°C). It represents how the blob “normally” behaves.
   • Experimental Group: This half is subjected to your variable—in the CNRS study, this was a series of heatwave profiles simulated by a heating bulb.

Phase 2: The Volume Threshold

You cannot start the specialized tests immediately. You must wait for your blobs to stabilize and grow.

• The Rule: The experiment only proceeds once the volume of the plasmodium has doubled.
• The Reason: This ensures that the organism has sufficient energy reserves (ATP) to withstand the stress of the next phase and that any observed behavior is systemic, not just a reaction to the initial cutting stress.

Phase 3: The Growth vs. Exploration Tests

Once the volume has doubled, the blobs are split again into two distinct experimental tracks:

1. The Growth Test (Resource Abundance)

• The Setup: Provide the blob with an abundance of food (standardized oat flakes).
• The Metric: Researchers measure the Volume Increase over time.
• The Goal: To see how temperature dynamics affect the metabolism and biomass production. Does extreme heat stop the “factory” of the cell from producing more protoplasm?

2. The Exploration Test (Resource Scarcity)

• The Setup: Provide the blob with a large environment but no food (or food placed at a distance).
• The Metric: Researchers measure the Network Topology—the shape and speed of the search veins.
• The Goal: To see if heat affects the blob’s cognitive ability to map its environment. Does a heatwave make the blob “panic” and explore randomly, or does it become lethargic and stop searching?

Data Collection: Training the AI

The final step of the protocol involves “Citizen Machine Learning.” Because the CNRS has to process nearly one million photos, human eyes aren’t enough.

• Precision Photos: Volunteers take photos at specific 15-minute or 1-hour intervals using a smartphone.
• Contour Drawing: Volunteers manually trace the outer edges (the “pseudopodia”) of their blobs on the Petri dish surface.
• The Impact: These manual drawings are used as “ground truth” to train an algorithm to automatically detect and measure blobs in millions of other un-traced photos.

By following this protocol, you are doing more than just keeping a pet; you are contributing to a dataset that helps scientists understand if biological intelligence can survive a warming world.

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Ready to start? Copy the metric list from this guide and track your Control and Experimental groups in the same format each day.

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Origin and E-E-A-T

• Source: CNRS Report “Mon Blob à la maison” / Protocol Guide.
• Key Concept: Controlled Experimental Design (Control vs. Experimental).
• Researcher: Audrey Dussutour, CRCA-CNRS.