Behavioural and physiological effects of finely balanced decision-making in chickens.

Although the coefficient of variance was influenced by experimental condition, the difference was not quite statistically significant, and there were no treatment-related differences in latency to the first push and the RR interval, suggesting that the observed differences in pen measures were unlikely to be caused by the difficulty of decision-making.

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However, there was a strong trend for a lower SDNN/RR when making a finely balanced decision compared to an unbalanced one (range of individual standard deviation: finely balanced = 0.006–0.01, unbalanced = 0.002–0.05; t 13 = 2.10, p = 0.055, figure 6 b ).

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