Why We Divide People into Right-Handed and Left-Handed?
Do we really need to divide people into right-handed and left-handed? This seemingly simple classification has a long and complex history that goes beyond the quirks of handedness.
The Pervasive Need for Classification
Historically, humans have had a proclivity for categorization. We classify people into groups like tall and short, fat and thin, male and female, and now, most commonly, right-handed and left-handed. But why do we persist in such classifications? Is it justified, or are we just perpetuating an outdated practice?
Design for Right-Handed Individuals
The reason behind the skewed distribution of handedness lies in the design and manufacturing of tools and utensils. The majority of the world is designed with right-handers in mind. From everyday objects to professional tools, it seems like the world was built for those who are right-handed. This bias can lead to discomfort and inefficiency for left-handed individuals, as they often feel an outsider in a predominantly right-handed world.
The Arbitrary Nature of Direction
It’s important to note that the classification of left and right, like many others, often seems arbitrary. The directions were named based on the cardinal points: North, South, East, and West. However, why was the direction to the right named “right”? Who made this decision? It’s a practice that has been passed down through generations without much thought or justification.
Genetics and Handedness
Research suggests that handedness—whether one is right- or left-handed—is largely a genetic trait. About 85-90% of the population is right-handed, a statistic that raises intriguing questions about the advantages and disadvantages of handedness. The brain is responsible for this complex phenomenon, as the left hemisphere, which controls speech and writing, is predominantly associated with the right hand, while the left hemisphere, which is involved in creativity and imagination, controls the left hand.
Scientists have identified specific genes, such as PCSK6, that are likely involved in determining handedness. PCSK6 is key in the development of the left-right symmetry in the embryo. The study of these genetic factors not only sheds light on the origins of handedness but also opens up new avenues for understanding neurological development and the associated benefits or challenges.
Right-handedness, therefore, is not a matter of conscious decision or arbitrary categorization. It is a result of genetic and developmental factors that occur in the womb, setting the stage for handedness long before a child even enters the world. While we can appreciate the practical benefits of right-handed design, we must also acknowledge the challenges it poses for left-handed individuals.
Conclusion
While handedness is a fundamental aspect of human biology, the widespread classification of people into right-handed and left-handed serves a purpose beyond just convenience. Understanding the genetic and developmental basis of handedness can help us design more inclusive environments and tools for people of all handednesses.