Spatial/Temporal Resolution of Multiple Sources: Paths of Activation in Human Visual Cortex

We have employed neuromagnetic mapping techniques to characterize neural responses evoked by sinusoidal gratings presented at various locations in the visual field. A primary goal of this work has been to localize the neurophysiological processes which underlie response components empirically defined in previous event-related potential (ERP) studies. Our analyses have focused on temporal as well as spatial tracking of sources because the combination permits more powerful inferences concerning the number and location of active neural sources (1–4).