Why the secret to human language might be hidden in our left and right hands
In short: We are predominantly right-handed, a trait that sets us apart from most animals. Scientists now speculate that this physical asymmetry is genetically linked to our capacity for language. By exploring the molecular basis of handedness, we may finally uncover the deep biological roots of how we think and communicate.
In his 1992 Christmas Lectures, Charles Stirling delved into the profound significance of molecular handedness, or chirality. While we often perceive symmetry in our daily lives, our very existence relies on the handedness of molecules, both large and small. These chiral structures are essential for fundamental life processes, including the digestion of food, the construction of our bodies, and the transmission of genetic characteristics to future generations.
The historical understanding of this phenomenon traces back to 1847, when Pasteur solved the mystery of multiple tartaric acids by deducing molecular asymmetry. Today, we know that our sensory apparatus—such as our sense of taste and smell—is itself handed, allowing us to distinguish between different chiral molecules. These molecules are not merely abstract chemical concepts; they are the building blocks of our entire environment and our own biological systems.
A compelling area of modern research explores the potential genetic connection between our physical handedness and the neurobiology of language. Unlike most animals, which exhibit mixed handedness, humans are predominantly right-handed. If these two attributes are indeed interconnected, it could reveal the molecular biological basis for human language. Despite this progress, a significant mystery remains: the precise origin of chiral molecules in the natural world.
Stirling’s exploration emphasizes that our contact with handed molecules has deep implications for how we perceive the world. By examining the symmetry of our organs and the artefacts we create, we gain insight into the left-right relationships that define our existence. While we have made great strides in understanding how these molecules associate and react, the question of where this fundamental asymmetry first emerged remains an unsolved puzzle in science.
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Sources
- Summary by Intellect · source: The handed molecule - Charles Stirling 1992 Christmas Lectures 3/5
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