Abstract
This study compared retinotopic map identification in primary visual cortex (V1) using: (i) functional magnetic resonance imaging (fMRI) and (ii) visual evoked potentials (VEPs) coupled with dipole source localization (DSL). A multielectrode array was used to record VEPs while subjects viewed a flickering dartboard pattern modulated by a 16-bit m-sequence. The stimulus preferentially activates V1. Using a common time function DSL algorithm, the primary source of each stimulus patch was found independent of the fMRI. The VEP/DSL and fMRI localization data for each subject were aligned by a rigid translation and rotation. The average distance between VEP and corresponding fMRI sources was 10.8 mm +/- 3.8 mm. To assess the significance of the results, fMRI and DSL solutions were scrambled so the comparisons were no longer for corresponding patches. The average distance between the noncorresponding data sets was 17.2 mm for 50 million scrambles. The probability of the scrambled data yielding a better fit than the real data was p
| Original language | English |
|---|---|
| Pages (from-to) | 404-15 |
| Number of pages | 12 |
| Journal | Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society |
| Volume | 23 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - Oct 2006 |
Keywords
- Brain Mapping
- Evoked Potentials, Visual
- Functional Laterality
- Humans
- Image Processing, Computer-Assisted
- Imaging, Three-Dimensional
- Magnetic Resonance Imaging
- Oxygen
- Pattern Recognition, Visual
- Photic Stimulation
- Visual Cortex