To reveal convergence related-regions, we measured regional cerebral blood flow (rCBF) of 8 young normal subjects using 1 5 O labeled water and positron emission tomography during fixation, convergence and no-convergence tasks. Visual stimuli were given through a head-mounted display, and were virtual movement of the target in depth. Eye movements were monitored continuously by an infrared limbus tracker, for later quantitative assessment of task performance. After the anatomical standardization of each rCBF image, subtraction image of the fixation task from each task was calculated voxel by voxel for each subject. Then student t-images were calculated to find significant activation. Occipito-temporal area, inferior parietal lobule, middle occipital gyrus, cuneus, lingual gyrus and fusiform gyrus were activated during convergence task. Occipito-temporal area, inferior parietal lobule and middle frontal gyrus were differentially activated by convergence/no-convergence task.