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### Experimental Results
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## Experimental Results
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This document summarizes the key findings from the predator-prey cellular automaton experiments exploring the Hydra effect and self-organized criticality.
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The prey cluster size distributions were analyzed at the transition point to test for SOC. SOC theory predicts a power law distribution.
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![Cluster Size Distribution](/Users/kimonanagnostopoulos/CSS_Project/images/criticality_phase1.png)
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![Cluster Size Distribution](images/criticality_phase1.png)
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The log-log plot shows the probability distribution of prey cluster sizes at the critical point. Visual inspection suggests approximate power law scaling with $$\alpha \approx 2.29$$.
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We enabled per-cell evolution of the prey death parameter. Each prey individual carries its own ```prey_death_rate``` value. The offsprings inherit their parents value with Gaussian mutation. Evolution occurs during the warmup steps, then frozen for the measurement.
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![Evolution Convergence](/Users/kimonanagnostopoulos/CSS_Project/images/evo_plot.png)
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![Evolution Convergence](images/evo_plot.png)
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**Right panel**: The evolved prey death rate as a function of initial prey death rate.
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![Finite-Size Scaling](/Users/kimonanagnostopoulos/CSS_Project/images/fss_phase3.png)
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![Finite-Size Scaling](images/fss_phase3.png)
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The figure shows prey cluster size distributions at the critical point across all system sizes with lognormal fit parameters and likelihood ratios.
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### Results: Undirected Hunting (Phase 4)
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![Hydra Curves Undirected](/Users/kimonanagnostopoulos/CSS_Project/images/hyrda_fitting_plot.png)
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![Hydra Curves Undirected](images/hyrda_fitting_plot.png)
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**Left panel**: All parameter combinations exhibiting the Hydra effect.
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**Right panel**: Curves truncated at the maximum derivative point, isolating the rising (Hydra) portion. Color indicates the maximum positive derivative—darker blue corresponds to steeper initial increases.
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![3D Heatmap Undirected](/Users/kimonanagnostopoulos/CSS_Project/images/cube_phase4.png)
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![3D Heatmap Undirected](images/cube_phase4.png)
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The 3D voxel plots show Hydra effect strength (quadratic coefficient) across the parameter space.
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![Quadratic Coefficient Undirected](/Users/kimonanagnostopoulos/CSS_Project/images/coeffs_phase4.png)
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![Quadratic Coefficient Undirected](images/coeffs_phase4.png)
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**Left panel (Strong Hydra, coef > 15)**: Sharp, pronounced peaks with prey density increasing from ~0.3–0.6 to ~0.7–0.8 before collapsing.
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**Right panel (Moderate Hydra, coef 5–10)**: Gentler curves with broader peaks. The Hydra effect is present but less dramatic.
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### Results: Directed Hunting (Phase 6)
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![3D Heatmap Directed](/Users/kimonanagnostopoulos/CSS_Project/images/cube_phase6.png)
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![3D Heatmap Directed](images/cube_phase6.png)
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The same analysis with directed hunting enabled reveals a dramatically different pattern.
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3. **More concentrated**: The effect is stronger where it occurs but may be more restricted in parameter space
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![Quadratic Coefficient Directed](/Users/kimonanagnostopoulos/CSS_Project/images/coeffs_phase6.png)
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![Quadratic Coefficient Directed](images/coeffs_phase6.png)
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**Left panel (Strong Hydra, coef > 15)**: Extremely sharp peaks with quadratic coefficients reaching 49–98. However, the curves are notably noisier than the undirected case, with irregular trajectories.
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**Right panel (Moderate Hydra, coef 5–10)**: More variable behavior compared to undirected hunting. Some curves show multiple peaks or irregular shapes.

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