Study of 8 Elbow-Writing Trials Challenges Innate Limb Dominance
Updated
Updated · ScienceAlert · Jul 14
Study of 8 Elbow-Writing Trials Challenges Innate Limb Dominance
1 articles · Updated · ScienceAlert · Jul 14
Summary
Right-handed participants showed no advantage when writing with their right elbow versus their left, with researchers finding dominance "disappeared" once the task shifted to an unpracticed body part.
Eight trials of writing the letter A and number 8 with hands and then elbows let the team isolate practice from lifelong hand preference; a neural network rated elbow output from both sides similarly poor.
Training then improved elbow-writing quality on both dominant and non-dominant sides, suggesting the limitation was lack of experience rather than an inborn motor-control edge in one brain hemisphere.
The UCLA and Johns Hopkins researchers argue that skilled use of pens, tools and similar objects reflects years of asymmetric practice, challenging the view that handedness proves one hemisphere is intrinsically better at fine motor control.