Source Estimation of the Magnetic Field Evoked by a Mental Rotation Task

Abstract

A mental rotation process requires rotation and matching of a pair of mental images. We measured MEG signals during mental rotation processes and estimated their source distributions, using the MUSIC (Multiple Signal Classification) algorithm. After being shown a pair of simple line-drawings, the subjects were required to discriminate a rotation-symmetric pair from a mirror-reversed pair. Activation of the right lateral posterior temporal region at a time about 200 ms after the onset of mental rotation stimuli was observed in three of the five subjects.