This study examined the variations of the lambda potentials caused by the verbal-spatial differences of the right and left hemispheres. Six subjects were presented visual stimuli consisting of Japanese katakana characters and small geometric patterns. Subjects were assigned two tasks. The verbal task was to associate characters and find words. The pattern task was to connect geo-metric patterns and identify patterns of larger size. EEGs and EOGs were recorded. EEGs time-locked to offset of saccades were averaged in order to obtain the lambda potentials associated with offset of saccades (i.e. fixation pauses). The L/ (R -E-L) amplitude ratios of the lambda potentials in the verbal task was higher than 0.5. The ratio in the pattern task was lower than 0.5. The difference between the ratios for the two tasks was statistically significant. The results suggest that the lambda potentials reflect hemispheric differences for verbal and spatial functions.