Photic driving evoked by hemifield flickering dot pattern stimulation in a patient with brain tumor

We have described photic driving evoked by hemifield 5/sec flickering dot pattern stimulation in a patient suffering from a metastatic tumor in the left parietal lobe. Based on an analysis of the photic driving in this particular patient, the left upper lip of the visual cortex is presumed to be the most sensitive to 5/sec flickering dot pattern stimulation. It is suggested that such an examination might be useful for determining local functional disturbance in the visual cortex.