Ręczność, praksja i język: nowe spojrzenie na delikatną triadę (original) (raw)

People typically show right-hand dominance in spontaneous performance of small daily tasks and left-hemisphere dominance in the control of complex manual actions and language. If these behaviors are linked by common cerebral specialization then they should be organized similarly in the brain, regardless of handedness. Because most of the studies on these relationships were focused on right-handers and rare cases of people with mirror-reversed lateralization of functions, the strengths of their relationships still remain unclear. Based on data from 63 individuals (27 right-handers, 15 ambidextrous, and 21 left-handers) studied with functional magnetic resonance imaging (fMRI) in this work we show that the relationships between handedness and praxis, and handedness and language are substantially weaker than a direct relationship between praxis and language. These results further support the idea that hand preference is controlled by the brain relatively independently from higher order manual functions and the skills underlying language use.