Strength and direction of lateralized behaviour at the individual level
Fifteen of the 32 studied howler monkeys displayed significant lateral biases with single motor patterns (Binomial test; Z ≥ 1.96 and Z ≤ -1.96; P < 0.05). See figure 3.
However, the individual preferences found here were not present across motor patterns.
Therefore, although a side preference was found in some individuals, there was no side specialization.
Figure 3: Total number of motor patterns (y axis) in which each individual (colour bars) had a significant preference to use its left, its right or showed no limb/side preference (x axis).
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