Richards, J.E. (2005). Localizing cortical sources of event-related potentials in infants' covert orienting. Developmental Science, 8, 255–278. (PDF)
This study used cortical source analysis to localize the cortical sources of event-related-potentials (ERP) during covert orienting in infants aged 14 and 20 weeks. The infants were tested in a spatial cueing procedure. The reaction time to localize the target showed response facilitation for valid trials relative to invalid or neutral trials. High-density EEG (126 channels) was recorded during the task, and independent component analysis and equivalent current dipole analysis was used to locate the cortical sources of the EEG during the task. There was a larger P1 ERP component on the valid trials than the other trials (P1 validity effect), and this occurred due to activity in Brodmann’s areas 18 and 19. A presaccadic ERP component occurred over the frontal cortex (-65 ms) and was larger to a target in a cued location than in uncued locations. This effect was localized to the superior frontal gyrus on the inferior portion of the prefrontal cortex. Increases from 14 to 20 weeks in amplitude of the P1 validity effect and the presaccadic ERP could be modeled by an increase in activation in the corresponding cortical areas.