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Magnetoencephalographic recording of steady-state visual evoked cortical activity
M M Müller1, W Teder, S A Hillyard
1Department of Neurosciences, University of California, San Diego, La Jolla, USA. Matthias.M.Mueller@uni-konstanz.de
Abstract:
Steady-state visual evoked magnetic fields (SSVEFs) were recorded in response to a flickering light source using a 37-channel magnetometer. The SSVEF had a sinusoidal waveform having the same fundamental frequency as the driving stimulus, which was either 6.0 Hz, 11.9 Hz, or 15.2 Hz. SSVEF topographies at each frequency had a dipoloar form over the posterior head that could well-modelled by single equivalent current dipoles. The best-fit dipoles were localized in posterior occipital cortex for the SSVEFs to 6.0 and 11.9 Hz stimuli and in more anterior and ventromedial occipital cortex for the 15.2 Hz SSVEP.