Hemispheric differences in dot detection

Two experiments are reported using normal subjects which show a superior detection for dots in the left visual field. This is shown to be more pronounced for stimuli of reduced contrast and for male subjects. The cerebral activation hypothesis of hemispheric asymmetries is tested and found to contribute towards a visual field advantage to some extent but a structural account is also suggested. It is considered that the right hemisphere is prepotent for dealing with simple perceptual stimuli even when there is no spatial component for the task.