Primate Hand Dominance

Prosimian Ring-tailed Lemur, Lemur catta

The trait of hand dominance, particularly the bias towards right-hand dominance, is quite unique to the human population. While only 10% of the human population is left-handed, the rest of the primate family has an even ratio of left-handed and right-handed dominance. The hand preference may be trained for some species or acquired by other means, but the inborn hemispheric asymmetry is limited to humans.

Happy International Left-Handed Day!