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Scripta Scientifica Medica


Z. Stoyanov


Data of experimental studies and clinical investigations evidence about different actuality of the left and right half of subjective perceptive space and different contribution of left and right hemispheres in the process of sustaining the attention towards both parts of the space. Relatively less is known about the expression of these principles in left- and right-handers and in subjects with different combination of lateral preferences. Aim of this study was to find out differences between left-handers with left eye dominance and right-handers with right eye dominance in the actuality of the right and left parts of the subjective extrapersonal visual space. A total of 24 left-handers with left eye dominance (LH-LESs) and 24 right-handers with right eye dominance (RH-RESs) was studied. The bilateral organization of subjective extrapersonal visual space was estimated by the results of a complicated geometrical constructive task performed by Sander's parallelogram. In the two groups were compared: a) preferred initial staring position; b) directional exactness, and c) number of performances with left deviation, right deviation and correct fulfillment. As a whole in all the tested parameters RH-RESs demonstrate an expressed left tendency and preference to operate in the left part of the visual space. LH-LESs prefer right starting position, perform higher number of precise answers and deviations to the right, which reflects in the directional exactness of their results. It may be concluded that the individual type of lateral preferences, in particular the combination handedness- eyedness, is significantly reflected in the bilateral structure of the subjective visual space, possibly in connection with the distribution of the spatial visual attention. Based of the differences of cerebrolateral organization at LH-LESs and RH-RESs, rather possibly, a different type of egocentric co-ordinate system is formed. Furthermore, different strategy of extrapersonal space scanning characterized by higher actuality of its right or left part is applied.


subjective visual space; left-handers; right-handers; eye dominance; attention

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Z. Stoyanov

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