Physiological systems functioning dependence on left-handedness and its type

Abstract

The article is devoted to analyzing the literary data concerning to sinistrality mechanisms and theories, types (real, hidden, unreal), rate in some countries, sinistrality study applied significance (in part “left diseases”, “syndrome of the lefty” or “the left-hander syndrome”). Left-sided pathological processes (mandibles angular fractures and odontogenous phlegmons) were observed in real and hidden left-handers among Poltava regional hospital patients and UMSA students; right-sided – in real right-handers and non-real left-handers among them. Erythrocytes from right and left cubital veins had practically equal hemocoagulative features from the both sides. In capillary blood there were some differencies in right- and left-handed people: in the first one erythrocyte number, hemoglobin concentration, some rheological (viscosity, velocity sedimentation rate, hemolysis maximum time) and coagulative properties were dominant on the right, in the second one – on the left. In common, the erythrocyte hemostasis indexes asymmetry were more expressed in human capillary blood than in the venous one. The results received for the first time allowed differentiating the rheology and erythrocyte hemostasis reacting “right” and “left” types. Moreover, right-handed people had the right one, while left- handed – the left one. Real and hidden left-handers had the left reaction type or mentioned indices dominance on the left while real right-handers and unreal left-handers had right reaction type. Unreal sinistrality in Iranian students was accompanied by right-hemisphered simultant thinking pathway dominance resulting in difficult tests solving.