Figure 2
From: Learning curves and teaching when acquiring nut-cracking in humans and chimpanzees
Learning curves for the ‘probability for a nut to crack per hit’ in Taï chimpanzees and Mbendjele foragers; (a) when considering absolute age (above) and (b) when considering relative age whereby 1.0 corresponds to the population-specific age of first reproduction. Indicated are the fitted model and its confidence intervals. For the plot age was binned (bin width: 0.1 times maturation age) and the probabilities of nuts to be cracked were averaged per age bin. Symbol area represents the total number hits per age bin (2.9 to 180.1 and 2.9 to 272.3 in (a,b), respectively).
