Researchers suggest that the development of walking may explain why approximately 90% [1] of humans are right-handed.
This hypothesis addresses a long-standing biological mystery regarding why humans exhibit a population-level handedness preference that is not seen in other primate species. Understanding this link could provide deeper insight into how physical evolution shapes brain development.
According to reports published this week, about 90% [1] of people across every human culture favor their right hand. The research highlights that no other primate species shows a preference on this scale [1]. This suggests that the trait is not a random occurrence, but a specific result of human evolutionary biology.
Scientists said that the way humans learned to walk influenced the brain in a way that favors right-handedness [1]. The coordination required for bipedal locomotion may have created a neurological bias that eventually manifested in manual dexterity. This connection implies that the motor skills required for walking and the motor skills required for tool use are neurologically intertwined.
While other primates use tools and show individual preferences for one hand or the other, they do not exhibit the same overwhelming statistical bias toward one side as humans do [1]. The researchers said that the unique transition to walking on two legs served as the catalyst for this divergence from other primates.
This theory suggests that the brain's organization for movement is closely linked to the organization of the hands. By examining the mechanics of human gait, scientists aim to map how the neural pathways for balance and walking may have reinforced the dominance of the right hemisphere's control over the right hand [1].
“About 90% of people across every human culture favor their right hand”
This research suggests that human handedness is not merely a cultural or random trait, but a biological byproduct of bipedalism. If the link between walking and right-handedness is proven, it would indicate that the evolution of the human skeletal structure and the evolution of the human brain were deeply interdependent, with locomotion driving the neurological specialization of the hands.
