VISUAL EVOKED MAGNETIC-FIELDS REVEAL ACTIVITY IN THE SUPERIOR TEMPORAL SULCUS

Evoked magnetic fields to randomized infrequent omissions of visual st imuli resulted in a magnetic field pattern over the right hemisphere c onsistent with a dipolar source and led to localization of this source within the superior temporal sulcus. Previous investigations using im planted microelectrodes, ablation/lesion procedures in monkeys and obs ervations of behavioral anomalies following injury in humans have alre ady indicated the importance of the inferior portions of the temporal lobe in visual processing. However, until now, no method was available to study noninvasively the role of temporal cortex during visual proc essing.