UCL  IRIS
Institutional Research Information Service
UCL Logo
Please report any queries concerning the funding data grouped in the sections named "Externally Awarded" or "Internally Disbursed" (shown on the profile page) to your Research Finance Administrator. Your can find your Research Finance Administrator at https://www.ucl.ac.uk/finance/research/rs-contacts.php by entering your department
Please report any queries concerning the student data shown on the profile page to:

Email: portico-services@ucl.ac.uk

Help Desk: http://www.ucl.ac.uk/ras/portico/helpdesk
Publication Detail
Mapping of the human visual cortex using image guided transcranial magnetic stimulation
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Fernandez E, Alfaro A, Tormos J, Martinez M, Vilanova H, Walsh V, Pascual-Leone A
  • Publication date:
    10/2002
  • Pagination:
    pp.115, 124
  • Journal:
    Brain Research Protocols
  • Volume:
    10
  • Issue:
    2
  • Print ISSN:
    1385-299X
  • Keywords:
    Human, Visual, Visual Cortex
  • Notes:
    Imported via OAI, 15:41:43 19th Jul 2007
Abstract
We describe a protocol using transcranial magnetic stimulation (TMS) to systematically map the visual sensations induced by focal andnon-invasive stimulation of the human occipital cortex. TMS is applied with a figure of eight coil to 28 positions arranged in a 232-cmgrid over the occipital area. A digitizing tablet connected to a PC computer running customized software, and audio and video recordingare used for detailed and accurate data collection and analysis of evoked phosphenes. A frameless image-guided neuronavigational deviceis used to describe the position of the actual sites of the stimulation coils relative to the cortical surface. Our results show that TMS is ableto elicit phosphenes in almost all sighted subjects and in a proportion of blind subjects. Evoked phosphenes are topographically organized.Despite minor inter-individual variations, the mapping results are reproducible and show good congruence among different subjects. Thisprocedure has potential to improve our understanding of physiologic organization and plastic changes in the human visual system and toestablish the degree of remaining functional visual cortex in blind subjects. Such a non-invasive method is critical for selection of suitablesubjects for a cortical visual prosthesis.ï›™ 2002 Elsevier Science B.V. All rights reserved.
Publication data is maintained in RPS. Visit https://rps.ucl.ac.uk
 More search options
UCL Researchers
Author
Institute of Cognitive Neuroscience
University College London - Gower Street - London - WC1E 6BT Tel:+44 (0)20 7679 2000

© UCL 1999–2011

Search by