Interhemispheric asymmetry of the brain: morphological and physiological aspects

Written by Markina L.D., Barkar A.A.

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Background. Interhemispheric asymmetry is one of the most important individual fundamental properties of the human brain.
Methods. Studies of the functional interhemispheric asymmetry of the apparently healthy volunteers aged 20–40 years (100 sinistrals and 100 dextrals) by methods of the electroencephalography (EEG) and cognitive evoked potentials.
Results. Description of a complex of indices based on an algorithmic analysis of the EEG and cognitive evoked potentials to be used for diagnosing the functional interhemispheric asymmetry.
Conclusions. By some new diagnostic methods elicited the valid sinistral and dextral differences in the form of positive factors of frequency and amplitude asymmetry of ? rhythm for the sinistral and negative ones for the dextral as well as a partial blockade of ??rhythm in a dominant hemisphere’s sensorimotor cortical projection after feast clenching of a leading hand. At that the latency index and amplitude of the P300 wave occurred to be shfiting to the dominant hemisphere.

Links to authors:

L.D. Markina, A.A. Barkar
Pacific State Medical University (2 Ostryakova Ave. Vladivostok 690950 Russian Federation)

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