21/05/2025
It is well known that around 90% of humans are right-handed, while approximately 10% prefer using their left hand. But what about animals?
We're excited to share a brand-new scientific paper by our colleague Felix Ströckens and co-authors: "Limb preferences in non-human vertebrates: A new decade" 🧠🐾 in the journal of Laterality. More than ten years after their landmark 2013 study, the team of researchers from our C. & O. Vogt Institute of Brain Research at HHU Düsseldorf, the Ruhr University Bochum, and MSH Medical School Hamburg, reviewed the scientific literature on limb usage in non-human vertebrates. They found that many vertebrate species also exhibit limb-use asymmetries - just like humans do. Their updated analysis spans 172 species across all non-extinct vertebrate orders, revealing that limb asymmetries are far more widespread than previously thought.
📊 Key findings:
• 39.53% of species show population-level limb asymmetries
• 32.56% show individual-level asymmetries
• Only 27.91% show no asymmetry at all
These findings clearly indicate that handedness is not unique to humans. Instead, it appears across a wide range of animal species and may have evolved in conjunction with the development of bilateral limbs.
Ströckens, F., Schwalvenberg, M., El Basbasse, Y., Amunts, K., Güntürkün, O., & Ocklenburg, S. (2025). Limb preferences in non-human vertebrates: A new decade. Laterality, 1–46. https://doi.org/10.1080/1357650X.2025.2499049