From Leonardo da Vinci to Oprah Winfrey, and from Napoleon Bonaparte to Jimi Hendrix the talents of left-handers have been celebrated across the generations.
However, the prevalence of people who favour their left hand over their right has always been a rough estimate – until now.
In the biggest ever global study of handedness researchers from across Europe, led in by the National and Kapodistrian University of Athens, have concluded that 10.6% of the world’s population are left-handed.
Details of the study of more than 2 million people by researchers at the National and Kapodistrian University of Athens, University of Oxford, University of Bristol, Ruhr University Bochum and St Andrews are published in Psychological Bulletin today (2.4.2020).
Frequency of left-handedness has shaped and underpinned different fields of research, from cognitive neuroscience to human evolution. While hundreds of empirical studies have assessed handedness, there has never been a large-scale, comprehensive review of the prevalence of handedness and the factors that moderate it.
For the study researchers examined five meta-analyses involving 200 studies totalling 2,396,170 individuals on hand preference for different manual tasks. They showed that left-handedness prevalence lies between 9.34% using the most stringent criterion of left-handedness, to 18.1% using the most lenient criterion of non-right-handedness, with the best overall estimate being 10.6%.
Typically handedness is measured by which hand is used to write with. However, for this study researchers allowed for the fact that about 9% of people use different hands for different tasks which further improved the accuracy for their findings.
Understanding handedness contributes to our understanding of human evolution. For example, it has been claimed that right-handedness, along with the capacity to make and use tools, to use language, and to show functional and anatomical cerebral specialisation, are characteristics specific to humans, and that they are intimately tied together in the divergent evolution of man from apes.
The leading author of the study, Dr Marietta Papadatou-Pastou, Assistant Professor of Neuropsychology at the National and Kapodistrian University of Athens, said:
“Handedness is measured routinely in psychological and neuroscientific studies, as indicated by the fact that there are more than 60,000 published papers for the search term "handedness" in the scientific database PubMed. However, the prevalence rate of left-handedness has been a point of dispute among different studies, and we report a robust estimation of this prevalence, providing a definitive answer to a long-standing, heated debate.”
Co-author Dr Silvia Paracchini of the School of Medicine at St Andrews, further adds:
“This study will provide a useful reference for different areas of handedness research. In addition to providing reliable figures, the study highlights variability across studies depending on the different criteria used to measure handedness. While we intuitively classify handedness as a left/right category, these data show that the proportion of people using different hands for different task is almost as big as the proportion of the left-handers”
“Human handedness: A meta-analysis” is published in the Psychological Bulletin.
