Personality heterophily and friendship as drivers for successful cooperation.

For all three groups, a positive trend or a significant correlation was found between the proportion of successful cooperation and test sessions (Spearman correlation test, Gr.1: ρ = 0.30, p = 0.10; Gr.2: ρ = 0.34, p = 0.06, Gr.3: ρ = 0.79, p < 0.001), indicating an effect of learning.

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