Objective: 

Hemispheric asymmetry evolved because of a left hemisphere speech processing specialization. Cortical asymmetries are well established in humans for language and motor regions and correlate with handedness. The most explicit specialization of brain hemisphere functions has persons with right hand dominance (right-handers).

Methods: 

Thirty-two students of both genders (aged 19 -23) were involved in this study. All participants were asked to fill a questionnaire to detect their brain profile. For testing psycho-physiological indicators of students Vienna Test System was applied. Stress reactivity of students was detected using Determination Test (DT) S1 version. Hand motor capacity was detected using MLS (Motor performance series) tests.

Results: 

No statistically significant differences of stress reactivity by DT test results between persons with different brain hemisphere dominance were observed. Although the results of investigation demonstrated that persons with unvoiced hemisphere dominance work faster: the total number of reactions for them was greater but they made more mistakes. Comparing hand motor capacity of right-handers and left-handers in ability to work with right hand no statistically significant differences were find, while regarding their ability to work with left hand left-handers remarkably surpass right-handers. Working with both hands simultaneously left-handers did not demonstrate remarkable differences in the number of taps performed with each hand, while right-handers demonstrate significant differences: with right hand they worked faster than with left hand.

Conclusions: 

Right-handers' brain functional asymmetry is more stable and the dominance of left hemisphere is more explicit than the dominance of right hemisphere of left-handers.