Summary
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.
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This work was supported by grants from the Deutsche Forschungsgemeinschaft, the U.S. Office of Naval Research (N00014-93-1-0942) and N.I.M.H. (MH-25594). The authors thank Lacey Kurelowech, Parti Quint, Joslyne Foley and Annette Sterr for their help in data recording and technical assistance. We also thank Matt Marlow for software assistance and Prof. Thomas Elbert for helpful comments on data analysis.
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Müller, M.M., Teder, W. & Hillyard, S.A. Magnetoencephalographic recording of steadystate visual evoked cortical activity. Brain Topogr 9, 163–168 (1997). https://doi.org/10.1007/BF01190385
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DOI: https://doi.org/10.1007/BF01190385