The present study determines the relative strengths and positions of electrical activity in different regions of the brain. It aims to investigate the differential involvement of the left and right hemispheres of the brain when a visual stimulant is administered. This paper examines the frequency - intensity spectrum of recorded EEG signals at the electrodes at F7, F8, P3, P4, T3, T4, O1, O2, C3, C4, T5 and T6 situated in two hemispheres at a specific instant and inferences were drawn regarding hemispheric differences in EEG activities in four frequency bands 0-4 Hz, 4-8 Hz, 8-12 Hz and 12-25 Hz for all the four subjects. The present work will be useful for future research to study the importance of the functional asymmetry of the brain for the organization of emotions though the relative contribution of the left and right hemispheres. The findings of this study can also be used to develop brain-computer interface for various applications.