VISION, CENTRALMagnetically induced phosphenes in sighted, blind and blindsighted observersCowey, Alan1,2; Walsh, Vincent1 Author Information 1University of Oxford, Department of Experimental Psychology, South Parks Road, Oxford OX1 3UD, UK 2Corresponding Author: Alan Cowey Received 13 June 2000, accepted 31 July 2000 Acknowledgements: This work was supported by MRC grants G971/397/B and G9711247, by the Royal Society and by the Dr Hadwen Trust. We are very grateful to PS and GY for their enthusiastic co-operation and to Dr Amanda Ellison for her help in preparing the figures. NeuroReport: September 28, 2000 - Volume 11 - Issue 14 - p 3269-3273 Buy Abstract Direct stimulation of visual cortex can produce illusory flashes of light, called phosphenes. Here we describe the spatial and motion properties of phosphenes produced by transcranial magnetic stimulation in normal subjects and in two subjects with peripheral or cortical blindness. The totally retinally blind subject experienced normal phosphenes, apart from their concentration in the centre of the visual field, whereas the hemianopic subject, lacking area VI, did not experience phosphenes when his surviving extrastriate visual areas were stimulated. In the absence of VI, magnetically induced activity was unable to generate a conscious visual percept in the field defect. © 2000 Lippincott Williams & Wilkins, Inc.