Breaking the binary: Mixed-handedness and its implications for theoretical and clinical laterality research

Area of Science:

• Neuroscience
• Human Biology
• Psychology

Background:

• Handedness has historically been viewed as a binary trait (right- vs. left-handed).
• This dichotomous approach overlooks or misclassifies individuals with mixed-handedness.
• Existing classifications may lead to biased interpretations in clinical and survival fitness research.

Purpose of the Study:

• To advocate for the recognition of mixed-handedness as a distinct and central category in laterality research.
• To challenge the traditional binary view of human handedness.
• To highlight the implications of including mixed-handedness for understanding neurodevelopment, cognition, and clinical outcomes.

Main Methods:

• This commentary reviews existing literature and empirical evidence.
• It critiques the limitations of binary handedness classification systems.
• It proposes a shift towards a more inclusive model of laterality.

Main Results:

• The binary classification of handedness is methodologically limited and can result in misinterpretation.
• Mixed-handedness is frequently overlooked, leading to a skewed understanding of human functional asymmetry.
• Empirical evidence supports the inclusion of mixed-handedness in laterality research.

Conclusions:

• Recognizing mixed-handedness is essential for advancing the field of laterality research.
• A more nuanced understanding of handedness, including mixed-handedness, can correct biases and improve research accuracy.
• This inclusive approach has significant implications for neurodevelopmental, cognitive, and clinical studies.