Most psychological studies investigating handedness have two different categories: left-handedness and right-handedness. A large-scale meta-analysis integrating the results of such studies found that about 10.6% of the volunteers investigated in these studies were left-handed and 89.4% were right-handed (Papadatou-Pastou, and co-workers, 2020).

Interestingly, a minority of handedness studies also included a third handedness category: mixed-handedness. Indeed, a recent study using sophisticated statistical methods confirmed that handedness is indeed is very likely to have three different forms, not two (Mundorf and co-workers, 2024). Typically, psychological handedness studies find out about the handedness of someone using questionnaires containing several questions about their preferred hand for various activities. This could, for example, include writing, drawing, cutting, opening a lid,........

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