Topographic mapping of the pattern onset evoked magnetic response to stimulation of different portions of the visual field

Visual evoked magnetic responses to pattern onset/offset stimuli were recorded in 5 normal subjects. The outgoing and ingoing magnetic currents were seen maximally over the contralateral visual cortex to the half field stimulated in the majority of subjects. The distribution of magnetic currents wit...

Full description

Saved in:
Bibliographic Details
Published in:International journal of psychophysiology 1994-05, Vol.16 (2), p.175-183
Main Authors: Harding, Graham F.A., Degg, Christopher, Anderson, Stephen J., Holliday, Ian, Fylan, Fiona, Barnes, Gareth, Bedford, James
Format: Article
Language:English
Subjects:
Adult
Brain Mapping
Calcarine fissure
Electroencephalography
Evoked Potentials, Visual - physiology
Humans
Magnetoencephalography
Multi channel magnetic recording
Neuromagnetometry
Pattern onset/offset
Visual evoked magnetic responses
Visual Fields - physiology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Visual evoked magnetic responses to pattern onset/offset stimuli were recorded in 5 normal subjects. The outgoing and ingoing magnetic currents were seen maximally over the contralateral visual cortex to the half field stimulated in the majority of subjects. The distribution of magnetic currents with half field stimulation would be consistent with a dipole on the midline with the positive and pointing laterally. Quadrantic stimuli produced dipoles which would be consistent with a vector sum of dipoles situated, in the case of upper quarter field stimulation, in the lingual gyri on the floor of the calcarine fissure. Lower quadrantic stimulation produced a vector consistent with dipoles on the cuneal gyrus and on the ceiling of the calcarine fissure producing a resultant vector. The use of paired octant stimuli to improve localisation was demonstrated on both right left and upper and lower half fields.
ISSN:0167-8760
1872-7697
DOI:10.1016/0167-8760(89)90044-5