Right Sided Lateralization of Gamma Activity of EEG in Young Healthy Males

Introduction: Functional asymmetry of the brain as studied on the electroencephalogram (EEG) can be used to obtain important information about the lateralization of brain electrical activity, which is closely related with sensorimotor, cognitive and behavioral functions. Thus frequency bands of the EEG trace can serve as potential markers of cortical functions in the sensorimotor, cognitive and behavioral domains. Previous studies have reported morphological asymmetry of the brain. However, the functional implication of morphological asymmetry of the brain is not been fully understood. The aim of the study was to investigate the lateralization of cortical oscillatory activity on the EEG in healthy humans. \n \nMaterials and Methods: Fifteen healthy males with an average age of 23.65 years (SD=6.12) participated in the study. EEG recordings were performed using two channel bipolar montage; F2–F4 (right brain hemisphere) and F3–F7 (left brain hemisphere). \n \nResults: Gamma activity was significantly higher on the right side of the brain compared to the left side (p˂0.05). There was no significant difference on other EEG waves between the left and right brain (p˂0.05). \n \nConclusion: Right sided lateralization of gamma activity suggests that the right brain is concerned with cognitive and behavioral processing. The results of this study confirm previous reports that the right brain is cognitive. Thus gamma activity can be used as a useful marker of frontal activation in behavioral and cognitive training.