Home Mind & Brain The Neglected Minority: The Right-Hand Bias in Psychological Research and Its Impact on Left-Handed Individuals

The Neglected Minority: The Right-Hand Bias in Psychological Research and Its Impact on Left-Handed Individuals

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Throughout history, left-handed individuals have been a minority in a predominantly right-handed world. From the layout of tools and appliances to the design of everyday objects, society has catered to the right-handed majority. However, the impact of right-hand bias extends beyond physical accommodations. Recent research reveals a concerning trend within psychological studies: a significant underrepresentation of left-handers

The prevalence of left-handedness

To understand the significance of right-hand bias, it is essential to recognise the prevalence of left-handedness. Roughly 10% of the world’s population consists of left-handers, who exhibit a different dominance in their brain hemispheres compared to right-handers. This variation has piqued the curiosity of researchers seeking to understand the relationship between handedness and cognitive processes.

Right-hand bias in psychological research

Despite the intriguing nature of left-handedness, studies on the subject have been disproportionately biased towards right-handers. Numerous research articles have predominantly focused on right-handers, resulting in a scarcity of data on left-handed individuals. This right-hand bias leads to an incomplete understanding of the cognitive, emotional, and behavioural differences between left and right-handers.

Contributing factors

Several factors contribute to the underrepresentation of left-handers in psychological research. Firstly, societal norms have long favored right-handedness, leading to a lack of awareness and recognition of the importance of studying left-handed individuals. Additionally, the recruitment process for research participants often fails to consider the representation of left-handers, further perpetuating the bias.

Methodological challenges

Research methodologies themselves can present challenges when studying left-handers. Many psychological tests and assessments are designed with right-handers in mind, making it difficult to accurately measure the cognitive abilities and characteristics of left-handers. This design flaw can lead to inaccurate conclusions and generalisations that do not hold true for left-handed individuals.

Consequences of right-hand bias

The underrepresentation of left-handers in psychological research has several consequences. Firstly, it hinders the development of a comprehensive understanding of human cognition and behaviour. By neglecting the study of left-handers, researchers miss out on potentially valuable insights into the functioning of the brain and its impact on various aspects of human experience.

Furthermore, the lack of research on left-handers perpetuates misconceptions and stereotypes. Left-handers are often subjected to myths and negative associations, such as being clumsy or unintelligent. These stereotypes can lead to stigmatisation and discrimination, impacting the well-being and self-esteem of left-handed individuals.

Addressing the bias

Recognising and addressing the right-hand bias in psychological research is crucial for a more inclusive understanding of human diversity. Researchers need to actively include left-handers in their studies to ensure accurate representations and valid conclusions. This can be achieved through intentional recruitment strategies that ensure a diverse sample population.

Additionally, efforts should be made to develop assessment tools and experimental designs that are suitable for left-handers. By accounting for their unique cognitive and motor skills, researchers can capture a more accurate picture of human behaviour, cognitive processing, and emotional responses.

left handed

The underrepresentation of left-handers in psychological research is a concerning issue that highlights the presence of right-hand bias. By neglecting to include left-handers in studies, researchers risk perpetuating misconceptions, limiting their understanding of human cognition, and inhibiting the development of inclusive psychological theories. It is imperative for researchers to actively address this bias by recruiting left-handed individuals and designing methodologies that account for their unique characteristics. By doing so, we can foster a more comprehensive and inclusive understanding of human diversity and enhance the quality of psychological research as a whole.


Evelyn Hawthorne, PhD is a cognitive psychologist with a keen interest in uncovering biases, challenges the right-hand dominance in psychological research.

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