We describe a protocol using transcranial magnetic stimulation (TMS) to systematically map
the visual sensations induced by focal and non-invasive stimulation of the human occipital
cortex. TMS is applied with a figure of eight coil to 28 positions arranged in a 2× 2-cm grid
over the occipital area. A digitizing tablet connected to a PC computer running customized
software, and audio and video recording are used for detailed and accurate data collection
and analysis of evoked phosphenes. A frameless image-guided neuronavigational device is …