OFC recording targets were determined from previously obtained MR images, and acute mapping of gray matter - white matter boundaries. Recording sites were bilateral in both subjects, and included areas 11 and 13. The middle image shows the center of the recording chambers in each subject (Subject M AP29, Subject N AP30, relative to the inter-aural line). The most anterior (top) and posterior (bottom) recording locations are also shown. Yellow lines indicate calculated electrode trajectories within each recording field.