Contrast-response functions of the multifocal steady-state VEP (MSV)

► Contrast response functions for spatial frequency doubling stimuli were recordable using a few repeats of a 20 s stimulus. ► The results indicated interesting physiology at contrasts below 10% and near the fovea. ► Separately measured long-range nonlinear interactions between visual field regions appeared to arise from extrastriate cortical areas.